2013新春奉送：Android摄像头开发完美demo---(循环聚焦,缩放大小,旋转picture,查询支持的picturesize, ImageButton按键效果）...

2013新春奉送：Android摄像头开发完美demo---(循环聚焦,缩放大小,旋转picture,查询支持的picturesize, ImageButton按键效果）

【后注：】下载代码的注意，我的手机是4.3寸的屏，华为U9200.如果不能运行的请修改参数。看本篇的第四条。Y的，省的说我传的代码不能用

除夕之夜，程序员还在编代码。http://blog.youkuaiyun.com/yanzi1225627/article/details/7926994这是我几个月前写的代码，现在看来真是垃圾不堪阿。变量名字不规范，整个架构拉杂，几乎没有注释，程序不稳键，没有安全退出，导致摄像头下次不可用。

这个代码几乎涉及到了摄像头开发的所有方面，（除了PreviewCallback，这块东西我会结合android摄像头自动识别人脸/火灾来谈)，且力求精简，是杂家的心血阿！相对之前改进之处有：

1,精简。只有一个ImageButton用来实现按下拍照。拍照后自动保存，进入预览界面。 不像原来的要三个按键：预览/拍照/保存。

2,聚焦方面实现不间断循环聚焦。 不像之前的，要按一下按键聚焦一次。

3,ImageButton增加了按下的效果。按之前示例如下：，点击后背景变暗，有种风车旋转的感觉。

4,增加了查询摄像头PictureSizes和PreviewSize的代码，调试程序时应先查询出自己的参数然后配置。不同的手机参数不同。另外，预览surfaceView的高我设为800px，如果手机屏幕太小，这个参数要改。

5,改进了之前的按back返回按键退出程序后，再次进入程序camera没有释放，致使程序挂掉的问题。

6,改进了预览时手机横竖屏切换时，程序挂掉的毛病。但这里的布局还是采用默认的竖屏。

7,在实现循环聚焦的同时，保留了autoFocus（）接口。可以测试出，在使用FOCUS_MODE_CONTINUOUS_VIDEO聚焦模式下，autoFocus不发挥作用。

8,注释更加良好。

废话不说了请看源码：

第一部分：Manifinest.xml

[html] view plain copy print ?

1. <manifestxmlns:android="http://schemas.android.com/apk/res/android"
2. package="yan.guoqi.rectphoto"
3. android:versionCode="1"
4. android:versionName="1.0">
6. <uses-sdk
7. android:minSdkVersion="8"
8. android:targetSdkVersion="15"/>
9. <!--增加文件存储和访问摄像头的权限-->
10. <uses-permissionandroid:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
11. <uses-permissionandroid:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
12. <uses-permissionandroid:name="android.permission.CAMERA"/>
13. <uses-featureandroid:name="android.hardware.camera"/>
15. <application
16. android:icon="@drawable/ic_launcher"
17. android:label="@string/app_name"
18. android:theme="@style/AppTheme">
19. <activity
20. android:name=".RectPhoto"
21. android:label="@string/title_activity_rect_photo">
22. <intent-filter>
23. <actionandroid:name="android.intent.action.MAIN"/>
25. <categoryandroid:name="android.intent.category.LAUNCHER"/>
26. </intent-filter>
27. </activity>
28. </application>
30. </manifest>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="yan.guoqi.rectphoto"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />
    <!-- 增加文件存储和访问摄像头的权限 -->
    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".RectPhoto"
            android:label="@string/title_activity_rect_photo" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

第二部分：布局文件

[html] view plain copy print ?

1. <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
2. xmlns:tools="http://schemas.android.com/tools"
3. android:layout_width="fill_parent"
4. android:layout_height="fill_parent"
5. android:orientation="vertical">
7. <TextView
8. android:layout_width="wrap_content"
9. android:layout_height="wrap_content"
10. android:text="@string/BestWish"
11. tools:context=".RectPhoto"/>
13. <FrameLayout
14. android:layout_width="wrap_content"
15. android:layout_height="wrap_content">
17. <SurfaceView
18. android:id="@+id/previewSV"
19. android:layout_width="fill_parent"
20. android:layout_height="800px"/>
21. </FrameLayout>
23. <ImageButton
24. android:id="@+id/photoImgBtn"
25. android:layout_width="wrap_content"
26. android:layout_height="wrap_content"
27. android:background="@drawable/photo_img_btn"
28. android:layout_gravity="center"/>
30. </LinearLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/BestWish"
        tools:context=".RectPhoto" />

    <FrameLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >

        <SurfaceView
            android:id="@+id/previewSV"
            android:layout_width="fill_parent"
            android:layout_height="800px" />
    </FrameLayout>

    <ImageButton
        android:id="@+id/photoImgBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/photo_img_btn"
        android:layout_gravity="center" />

</LinearLayout>

第三部分：RectPhoto.java主程序

[java] view plain copy print ?

1. packageyan.guoqi.rectphoto;
2. importjava.io.BufferedOutputStream;
3. importjava.io.File;
4. importjava.io.FileOutputStream;
5. importjava.io.IOException;
6. importandroid.app.Activity;
7. importandroid.graphics.Bitmap;
8. importandroid.graphics.BitmapFactory;
9. importandroid.graphics.ColorMatrixColorFilter;
10. importandroid.graphics.Matrix;
11. importandroid.graphics.PixelFormat;
12. importandroid.hardware.Camera;
13. importandroid.hardware.Camera.AutoFocusCallback;
14. importandroid.hardware.Camera.PictureCallback;
15. importandroid.hardware.Camera.ShutterCallback;
16. importandroid.os.Bundle;
17. importandroid.util.Log;
18. importandroid.view.MotionEvent;
19. importandroid.view.SurfaceHolder;
20. importandroid.view.SurfaceView;
21. importandroid.view.View;
22. importandroid.view.View.OnClickListener;
23. importandroid.view.View.OnTouchListener;
24. importandroid.view.ViewGroup.LayoutParams;
25. importandroid.view.Window;
26. importandroid.view.WindowManager;
27. importandroid.widget.ImageButton;
29. publicclassRectPhotoextendsActivityimplementsSurfaceHolder.Callback{
30. privatestaticfinalStringtag="yan";
31. privatebooleanisPreview=false;
32. privateSurfaceViewmPreviewSV=null;//预览SurfaceView
33. privateSurfaceHoldermySurfaceHolder=null;
34. privateImageButtonmPhotoImgBtn=null;
35. privateCameramyCamera=null;
36. privateBitmapmBitmap=null;
37. privateAutoFocusCallbackmyAutoFocusCallback=null;
39. @Override
40. publicvoidonCreate(BundlesavedInstanceState){
41. super.onCreate(savedInstanceState);
42. //设置全屏无标题
43. requestWindowFeature(Window.FEATURE_NO_TITLE);
44. intflag=WindowManager.LayoutParams.FLAG_FULLSCREEN;
45. WindowmyWindow=this.getWindow();
46. myWindow.setFlags(flag,flag);
48. setContentView(R.layout.activity_rect_photo);
50. //初始化SurfaceView
51. mPreviewSV=(SurfaceView)findViewById(R.id.previewSV);
52. mySurfaceHolder=mPreviewSV.getHolder();
53. mySurfaceHolder.setFormat(PixelFormat.TRANSLUCENT);//translucent半透明transparent透明
54. mySurfaceHolder.addCallback(this);
55. mySurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
57. //自动聚焦变量回调
58. myAutoFocusCallback=newAutoFocusCallback(){
60. publicvoidonAutoFocus(booleansuccess,Cameracamera){
61. //TODOAuto-generatedmethodstub
62. if(success)//success表示对焦成功
63. {
64. Log.i(tag,"myAutoFocusCallback:success...");
65. //myCamera.setOneShotPreviewCallback(null);
67. }
68. else
69. {
70. //未对焦成功
71. Log.i(tag,"myAutoFocusCallback:失败了...");
73. }
76. }
77. };
79. mPhotoImgBtn=(ImageButton)findViewById(R.id.photoImgBtn);
80. //手动设置拍照ImageButton的大小为120×120,原图片大小是64×64
81. LayoutParamslp=mPhotoImgBtn.getLayoutParams();
82. lp.width=120;
83. lp.height=120;
84. mPhotoImgBtn.setLayoutParams(lp);
85. mPhotoImgBtn.setOnClickListener(newPhotoOnClickListener());
86. mPhotoImgBtn.setOnTouchListener(newMyOnTouchListener());
89. }
92. /*下面三个是SurfaceHolder.Callback创建的回调函数*/
93. publicvoidsurfaceChanged(SurfaceHolderholder,intformat,intwidth,intheight)
94. //当SurfaceView/预览界面的格式和大小发生改变时，该方法被调用
95. {
96. //TODOAuto-generatedmethodstub
97. Log.i(tag,"SurfaceHolder.Callback:surfaceChanged!");
98. initCamera();
100. }
103. publicvoidsurfaceCreated(SurfaceHolderholder)
104. //SurfaceView启动时/初次实例化，预览界面被创建时，该方法被调用。
105. {
106. //TODOAuto-generatedmethodstub
107. myCamera=Camera.open();
108. try{
109. myCamera.setPreviewDisplay(mySurfaceHolder);
110. Log.i(tag,"SurfaceHolder.Callback:surfaceCreated!");
111. }catch(IOExceptione){
112. //TODOAuto-generatedcatchblock
113. if(null!=myCamera){
114. myCamera.release();
115. myCamera=null;
116. }
117. e.printStackTrace();
118. }
122. }
125. publicvoidsurfaceDestroyed(SurfaceHolderholder)
126. //销毁时被调用
127. {
128. //TODOAuto-generatedmethodstub
129. Log.i(tag,"SurfaceHolder.Callback：SurfaceDestroyed");
130. if(null!=myCamera)
131. {
132. myCamera.setPreviewCallback(null);/*在启动PreviewCallback时这个必须在前不然退出出错。
133. 这里实际上注释掉也没关系*/
135. myCamera.stopPreview();
136. isPreview=false;
137. myCamera.release();
138. myCamera=null;
139. }
141. }
143. //初始化相机
144. publicvoidinitCamera(){
145. if(isPreview){
146. myCamera.stopPreview();
147. }
148. if(null!=myCamera){
149. Camera.ParametersmyParam=myCamera.getParameters();
150. 查询屏幕的宽和高
151. //WindowManagerwm=(WindowManager)getSystemService(Context.WINDOW_SERVICE);
152. //Displaydisplay=wm.getDefaultDisplay();
153. //Log.i(tag,"屏幕宽度："+display.getWidth()+"屏幕高度:"+display.getHeight());
155. myParam.setPictureFormat(PixelFormat.JPEG);//设置拍照后存储的图片格式
157. 查询camera支持的picturesize和previewsize
158. //List<Size>pictureSizes=myParam.getSupportedPictureSizes();
159. //List<Size>previewSizes=myParam.getSupportedPreviewSizes();
160. //for(inti=0;i<pictureSizes.size();i++){
161. //Sizesize=pictureSizes.get(i);
162. //Log.i(tag,"initCamera:摄像头支持的pictureSizes:width="+size.width+"height="+size.height);
163. //}
164. //for(inti=0;i<previewSizes.size();i++){
165. //Sizesize=previewSizes.get(i);
166. //Log.i(tag,"initCamera:摄像头支持的previewSizes:width="+size.width+"height="+size.height);
167. //
168. //}
171. //设置大小和方向等参数
172. myParam.setPictureSize(1280,960);
173. myParam.setPreviewSize(960,720);
174. //myParam.set("rotation",90);
175. myCamera.setDisplayOrientation(90);
176. myParam.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO);
177. myCamera.setParameters(myParam);
178. myCamera.startPreview();
179. myCamera.autoFocus(myAutoFocusCallback);
180. isPreview=true;
181. }
182. }
184. /*为了实现拍照的快门声音及拍照保存照片需要下面三个回调变量*/
185. ShutterCallbackmyShutterCallback=newShutterCallback()
186. //快门按下的回调，在这里我们可以设置类似播放“咔嚓”声之类的操作。默认的就是咔嚓。
187. {
189. publicvoidonShutter(){
190. //TODOAuto-generatedmethodstub
191. Log.i(tag,"myShutterCallback:onShutter...");
193. }
194. };
195. PictureCallbackmyRawCallback=newPictureCallback()
196. //拍摄的未压缩原数据的回调,可以为null
197. {
199. publicvoidonPictureTaken(byte[]data,Cameracamera){
200. //TODOAuto-generatedmethodstub
201. Log.i(tag,"myRawCallback:onPictureTaken...");
203. }
204. };
205. PictureCallbackmyJpegCallback=newPictureCallback()
206. //对jpeg图像数据的回调,最重要的一个回调
207. {
209. publicvoidonPictureTaken(byte[]data,Cameracamera){
210. //TODOAuto-generatedmethodstub
211. Log.i(tag,"myJpegCallback:onPictureTaken...");
212. if(null!=data){
213. mBitmap=BitmapFactory.decodeByteArray(data,0,data.length);//data是字节数据，将其解析成位图
214. myCamera.stopPreview();
215. isPreview=false;
216. }
217. //设置FOCUS_MODE_CONTINUOUS_VIDEO)之后，myParam.set("rotation",90)失效。图片竟然不能旋转了，故这里要旋转下
218. Matrixmatrix=newMatrix();
219. matrix.postRotate((float)90.0);
220. BitmaprotaBitmap=Bitmap.createBitmap(mBitmap,0,0,mBitmap.getWidth(),mBitmap.getHeight(),matrix,false);
221. //保存图片到sdcard
222. if(null!=rotaBitmap)
223. {
224. saveJpeg(rotaBitmap);
225. }
227. //再次进入预览
228. myCamera.startPreview();
229. isPreview=true;
230. }
231. };
232. //拍照按键的监听
233. publicclassPhotoOnClickListenerimplementsOnClickListener{
235. publicvoidonClick(Viewv){
236. //TODOAuto-generatedmethodstub
237. if(isPreview&&myCamera!=null){
238. myCamera.takePicture(myShutterCallback,null,myJpegCallback);
239. }
241. }
243. }
244. /*给定一个Bitmap，进行保存*/
245. publicvoidsaveJpeg(Bitmapbm){
246. StringsavePath="/mnt/sdcard/rectPhoto/";
247. Filefolder=newFile(savePath);
248. if(!folder.exists())//如果文件夹不存在则创建
249. {
250. folder.mkdir();
251. }
252. longdataTake=System.currentTimeMillis();
253. StringjpegName=savePath+dataTake+".jpg";
254. Log.i(tag,"saveJpeg:jpegName--"+jpegName);
255. //FilejpegFile=newFile(jpegName);
256. try{
257. FileOutputStreamfout=newFileOutputStream(jpegName);
258. BufferedOutputStreambos=newBufferedOutputStream(fout);
260. 如果需要改变大小(默认的是宽960×高1280),如改成宽600×高800
261. //BitmapnewBM=bm.createScaledBitmap(bm,600,800,false);
263. bm.compress(Bitmap.CompressFormat.JPEG,100,bos);
264. bos.flush();
265. bos.close();
266. Log.i(tag,"saveJpeg：存储完毕！");
267. }catch(IOExceptione){
268. //TODOAuto-generatedcatchblock
269. Log.i(tag,"saveJpeg:存储失败！");
270. e.printStackTrace();
271. }
272. }
274. /*为了使图片按钮按下和弹起状态不同，采用过滤颜色的方法.按下的时候让图片颜色变淡*/
275. publicclassMyOnTouchListenerimplementsOnTouchListener{
277. publicfinalfloat[]BT_SELECTED=newfloat[]
278. {2,0,0,0,2,
279. 0,2,0,0,2,
280. 0,0,2,0,2,
281. 0,0,0,1,0};
283. publicfinalfloat[]BT_NOT_SELECTED=newfloat[]
284. {1,0,0,0,0,
285. 0,1,0,0,0,
286. 0,0,1,0,0,
287. 0,0,0,1,0};
288. publicbooleanonTouch(Viewv,MotionEventevent){
289. //TODOAuto-generatedmethodstub
290. if(event.getAction()==MotionEvent.ACTION_DOWN){
291. v.getBackground().setColorFilter(newColorMatrixColorFilter(BT_SELECTED));
292. v.setBackgroundDrawable(v.getBackground());
293. }
294. elseif(event.getAction()==MotionEvent.ACTION_UP){
295. v.getBackground().setColorFilter(newColorMatrixColorFilter(BT_NOT_SELECTED));
296. v.setBackgroundDrawable(v.getBackground());
298. }
299. returnfalse;
300. }
302. }
304. @Override
305. publicvoidonBackPressed()
306. //无意中按返回键时要释放内存
307. {
308. //TODOAuto-generatedmethodstub
309. super.onBackPressed();
310. RectPhoto.this.finish();
311. }
312. }

package yan.guoqi.rectphoto;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Matrix;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.AutoFocusCallback;
import android.hardware.Camera.PictureCallback;
import android.hardware.Camera.ShutterCallback;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.ViewGroup.LayoutParams;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageButton;

public class RectPhoto extends Activity implements SurfaceHolder.Callback{
	private static final String tag="yan";
	private boolean isPreview = false;
	private SurfaceView mPreviewSV = null; //预览SurfaceView
	private SurfaceHolder mySurfaceHolder = null;
	private ImageButton mPhotoImgBtn = null;
	private Camera myCamera = null;
	private Bitmap mBitmap = null;
	private AutoFocusCallback myAutoFocusCallback = null;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		//设置全屏无标题
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		int flag = WindowManager.LayoutParams.FLAG_FULLSCREEN;
		Window myWindow = this.getWindow();
		myWindow.setFlags(flag, flag);

		setContentView(R.layout.activity_rect_photo);

		//初始化SurfaceView
		mPreviewSV = (SurfaceView)findViewById(R.id.previewSV);
		mySurfaceHolder = mPreviewSV.getHolder();
		mySurfaceHolder.setFormat(PixelFormat.TRANSLUCENT);//translucent半透明 transparent透明
		mySurfaceHolder.addCallback(this);
		mySurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

		//自动聚焦变量回调
		myAutoFocusCallback = new AutoFocusCallback() {

			public void onAutoFocus(boolean success, Camera camera) {
				// TODO Auto-generated method stub
				if(success)//success表示对焦成功
				{
					Log.i(tag, "myAutoFocusCallback: success...");
					//myCamera.setOneShotPreviewCallback(null);

				}
				else
				{
					//未对焦成功
					Log.i(tag, "myAutoFocusCallback: 失败了...");

				}


			}
		};

		mPhotoImgBtn = (ImageButton)findViewById(R.id.photoImgBtn);
		//手动设置拍照ImageButton的大小为120×120,原图片大小是64×64
		LayoutParams lp = mPhotoImgBtn.getLayoutParams();
		lp.width = 120;
		lp.height = 120;		
		mPhotoImgBtn.setLayoutParams(lp);				
		mPhotoImgBtn.setOnClickListener(new PhotoOnClickListener());
		mPhotoImgBtn.setOnTouchListener(new MyOnTouchListener());


	}


	/*下面三个是SurfaceHolder.Callback创建的回调函数*/
	public void surfaceChanged(SurfaceHolder holder, int format, int width,int height) 
	// 当SurfaceView/预览界面的格式和大小发生改变时，该方法被调用
	{
		// TODO Auto-generated method stub		
		Log.i(tag, "SurfaceHolder.Callback:surfaceChanged!");
		initCamera();

	}


	public void surfaceCreated(SurfaceHolder holder) 
	// SurfaceView启动时/初次实例化，预览界面被创建时，该方法被调用。
	{
		// TODO Auto-generated method stub		
		myCamera = Camera.open();
		try {
			myCamera.setPreviewDisplay(mySurfaceHolder);
			Log.i(tag, "SurfaceHolder.Callback: surfaceCreated!");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			if(null != myCamera){
				myCamera.release();
				myCamera = null;
			}
			e.printStackTrace();
		}



	}


	public void surfaceDestroyed(SurfaceHolder holder) 
	//销毁时被调用
	{
		// TODO Auto-generated method stub
		Log.i(tag, "SurfaceHolder.Callback：Surface Destroyed");
		if(null != myCamera)
		{
			myCamera.setPreviewCallback(null); /*在启动PreviewCallback时这个必须在前不然退出出错。
			这里实际上注释掉也没关系*/
			
			myCamera.stopPreview(); 
			isPreview = false; 
			myCamera.release();
			myCamera = null;     
		}

	}

	//初始化相机
	public void initCamera(){
		if(isPreview){
			myCamera.stopPreview();
		}
		if(null != myCamera){			
			Camera.Parameters myParam = myCamera.getParameters();
			//			//查询屏幕的宽和高
			//			WindowManager wm = (WindowManager)getSystemService(Context.WINDOW_SERVICE);
			//			Display display = wm.getDefaultDisplay();
			//			Log.i(tag, "屏幕宽度："+display.getWidth()+" 屏幕高度:"+display.getHeight());

			myParam.setPictureFormat(PixelFormat.JPEG);//设置拍照后存储的图片格式

			//			//查询camera支持的picturesize和previewsize
			//			List<Size> pictureSizes = myParam.getSupportedPictureSizes();
			//			List<Size> previewSizes = myParam.getSupportedPreviewSizes();
			//			for(int i=0; i<pictureSizes.size(); i++){
			//				Size size = pictureSizes.get(i);
			//				Log.i(tag, "initCamera:摄像头支持的pictureSizes: width = "+size.width+"height = "+size.height);
			//			}
			//			for(int i=0; i<previewSizes.size(); i++){
			//				Size size = previewSizes.get(i);
			//				Log.i(tag, "initCamera:摄像头支持的previewSizes: width = "+size.width+"height = "+size.height);
			//
			//			}


			//设置大小和方向等参数
			myParam.setPictureSize(1280, 960);
			myParam.setPreviewSize(960, 720);			
			//myParam.set("rotation", 90);  			
			myCamera.setDisplayOrientation(90);  
			myParam.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO);
			myCamera.setParameters(myParam);			
			myCamera.startPreview();
			myCamera.autoFocus(myAutoFocusCallback);
			isPreview = true;
		}
	}

	/*为了实现拍照的快门声音及拍照保存照片需要下面三个回调变量*/
	ShutterCallback myShutterCallback = new ShutterCallback() 
	//快门按下的回调，在这里我们可以设置类似播放“咔嚓”声之类的操作。默认的就是咔嚓。
	{

		public void onShutter() {
			// TODO Auto-generated method stub
			Log.i(tag, "myShutterCallback:onShutter...");

		}
	};
	PictureCallback myRawCallback = new PictureCallback() 
	// 拍摄的未压缩原数据的回调,可以为null
	{

		public void onPictureTaken(byte[] data, Camera camera) {
			// TODO Auto-generated method stub
			Log.i(tag, "myRawCallback:onPictureTaken...");

		}
	};
	PictureCallback myJpegCallback = new PictureCallback() 
	//对jpeg图像数据的回调,最重要的一个回调
	{

		public void onPictureTaken(byte[] data, Camera camera) {
			// TODO Auto-generated method stub
			Log.i(tag, "myJpegCallback:onPictureTaken...");
			if(null != data){
				mBitmap = BitmapFactory.decodeByteArray(data, 0, data.length);//data是字节数据，将其解析成位图
				myCamera.stopPreview();
				isPreview = false;
			}
			//设置FOCUS_MODE_CONTINUOUS_VIDEO)之后，myParam.set("rotation", 90)失效。图片竟然不能旋转了，故这里要旋转下
			Matrix matrix = new Matrix();
			matrix.postRotate((float)90.0);
			Bitmap rotaBitmap = Bitmap.createBitmap(mBitmap, 0, 0, mBitmap.getWidth(), mBitmap.getHeight(), matrix, false);
			//保存图片到sdcard
			if(null != rotaBitmap)
			{
				saveJpeg(rotaBitmap);
			}

			//再次进入预览
			myCamera.startPreview();
			isPreview = true;
		}
	};
	//拍照按键的监听
	public class PhotoOnClickListener implements OnClickListener{

		public void onClick(View v) {
			// TODO Auto-generated method stub
			if(isPreview && myCamera!=null){
				myCamera.takePicture(myShutterCallback, null, myJpegCallback);	
			}

		}

	}
	/*给定一个Bitmap，进行保存*/
	public void saveJpeg(Bitmap bm){
		String savePath = "/mnt/sdcard/rectPhoto/";
		File folder = new File(savePath);
		if(!folder.exists()) //如果文件夹不存在则创建
		{
			folder.mkdir();
		}
		long dataTake = System.currentTimeMillis();
		String jpegName = savePath + dataTake +".jpg";
		Log.i(tag, "saveJpeg:jpegName--" + jpegName);
		//File jpegFile = new File(jpegName);
		try {
			FileOutputStream fout = new FileOutputStream(jpegName);
			BufferedOutputStream bos = new BufferedOutputStream(fout);

			//			//如果需要改变大小(默认的是宽960×高1280),如改成宽600×高800
			//			Bitmap newBM = bm.createScaledBitmap(bm, 600, 800, false);

			bm.compress(Bitmap.CompressFormat.JPEG, 100, bos);
			bos.flush();
			bos.close();
			Log.i(tag, "saveJpeg：存储完毕！");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			Log.i(tag, "saveJpeg:存储失败！");
			e.printStackTrace();
		}
	}

	/*为了使图片按钮按下和弹起状态不同，采用过滤颜色的方法.按下的时候让图片颜色变淡*/
	public class MyOnTouchListener implements OnTouchListener{

		public final  float[] BT_SELECTED=new float[]
				{ 2, 0, 0, 0, 2,
			0, 2, 0, 0, 2,
			0, 0, 2, 0, 2,
			0, 0, 0, 1, 0 };			    

		public final float[] BT_NOT_SELECTED=new float[]
				{ 1, 0, 0, 0, 0,
			0, 1, 0, 0, 0,
			0, 0, 1, 0, 0,
			0, 0, 0, 1, 0 };
		public boolean onTouch(View v, MotionEvent event) {
			// TODO Auto-generated method stub
			if(event.getAction() == MotionEvent.ACTION_DOWN){
				v.getBackground().setColorFilter(new ColorMatrixColorFilter(BT_SELECTED));
				v.setBackgroundDrawable(v.getBackground());
			}
			else if(event.getAction() == MotionEvent.ACTION_UP){
				v.getBackground().setColorFilter(new ColorMatrixColorFilter(BT_NOT_SELECTED));
				v.setBackgroundDrawable(v.getBackground());
				
			}
			return false;
		}

	}
	
	@Override
	public void onBackPressed()
	//无意中按返回键时要释放内存
	{
		// TODO Auto-generated method stub
		super.onBackPressed();
		RectPhoto.this.finish();
	}
}

源码下载链接： http://download.youkuaiyun.com/detail/yanzi1225627/5060323

欢迎android爱好者加群248217350，备注：yanzi

注：代码不能正常运行的请看上面第4条，修改相关参数。
----------------------------------------------------------------------------------------本文系原创，转载请注明作者：yanzi1225627

【后注：】下载代码的注意，我的手机是4.3寸的屏，华为U9200.如果不能运行的请修改参数。看本篇的第四条。Y的，省的说我传的代码不能用

除夕之夜，程序员还在编代码。http://blog.youkuaiyun.com/yanzi1225627/article/details/7926994这是我几个月前写的代码，现在看来真是垃圾不堪阿。变量名字不规范，整个架构拉杂，几乎没有注释，程序不稳键，没有安全退出，导致摄像头下次不可用。

这个代码几乎涉及到了摄像头开发的所有方面，（除了PreviewCallback，这块东西我会结合android摄像头自动识别人脸/火灾来谈)，且力求精简，是杂家的心血阿！相对之前改进之处有：

1,精简。只有一个ImageButton用来实现按下拍照。拍照后自动保存，进入预览界面。 不像原来的要三个按键：预览/拍照/保存。

2,聚焦方面实现不间断循环聚焦。 不像之前的，要按一下按键聚焦一次。

3,ImageButton增加了按下的效果。按之前示例如下：，点击后背景变暗，有种风车旋转的感觉。

4,增加了查询摄像头PictureSizes和PreviewSize的代码，调试程序时应先查询出自己的参数然后配置。不同的手机参数不同。另外，预览surfaceView的高我设为800px，如果手机屏幕太小，这个参数要改。

5,改进了之前的按back返回按键退出程序后，再次进入程序camera没有释放，致使程序挂掉的问题。

6,改进了预览时手机横竖屏切换时，程序挂掉的毛病。但这里的布局还是采用默认的竖屏。

7,在实现循环聚焦的同时，保留了autoFocus（）接口。可以测试出，在使用FOCUS_MODE_CONTINUOUS_VIDEO聚焦模式下，autoFocus不发挥作用。

8,注释更加良好。

废话不说了请看源码：

第一部分：Manifinest.xml

[html] view plain copy print ?

1. <manifestxmlns:android="http://schemas.android.com/apk/res/android"
2. package="yan.guoqi.rectphoto"
3. android:versionCode="1"
4. android:versionName="1.0">
6. <uses-sdk
7. android:minSdkVersion="8"
8. android:targetSdkVersion="15"/>
9. <!--增加文件存储和访问摄像头的权限-->
10. <uses-permissionandroid:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
11. <uses-permissionandroid:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
12. <uses-permissionandroid:name="android.permission.CAMERA"/>
13. <uses-featureandroid:name="android.hardware.camera"/>
15. <application
16. android:icon="@drawable/ic_launcher"
17. android:label="@string/app_name"
18. android:theme="@style/AppTheme">
19. <activity
20. android:name=".RectPhoto"
21. android:label="@string/title_activity_rect_photo">
22. <intent-filter>
23. <actionandroid:name="android.intent.action.MAIN"/>
25. <categoryandroid:name="android.intent.category.LAUNCHER"/>
26. </intent-filter>
27. </activity>
28. </application>
30. </manifest>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="yan.guoqi.rectphoto"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />
    <!-- 增加文件存储和访问摄像头的权限 -->
    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".RectPhoto"
            android:label="@string/title_activity_rect_photo" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

第二部分：布局文件

[html] view plain copy print ?

1. <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
2. xmlns:tools="http://schemas.android.com/tools"
3. android:layout_width="fill_parent"
4. android:layout_height="fill_parent"
5. android:orientation="vertical">
7. <TextView
8. android:layout_width="wrap_content"
9. android:layout_height="wrap_content"
10. android:text="@string/BestWish"
11. tools:context=".RectPhoto"/>
13. <FrameLayout
14. android:layout_width="wrap_content"
15. android:layout_height="wrap_content">
17. <SurfaceView
18. android:id="@+id/previewSV"
19. android:layout_width="fill_parent"
20. android:layout_height="800px"/>
21. </FrameLayout>
23. <ImageButton
24. android:id="@+id/photoImgBtn"
25. android:layout_width="wrap_content"
26. android:layout_height="wrap_content"
27. android:background="@drawable/photo_img_btn"
28. android:layout_gravity="center"/>
30. </LinearLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/BestWish"
        tools:context=".RectPhoto" />

    <FrameLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >

        <SurfaceView
            android:id="@+id/previewSV"
            android:layout_width="fill_parent"
            android:layout_height="800px" />
    </FrameLayout>

    <ImageButton
        android:id="@+id/photoImgBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/photo_img_btn"
        android:layout_gravity="center" />

</LinearLayout>

第三部分：RectPhoto.java主程序

[java] view plain copy print ?

1. packageyan.guoqi.rectphoto;
2. importjava.io.BufferedOutputStream;
3. importjava.io.File;
4. importjava.io.FileOutputStream;
5. importjava.io.IOException;
6. importandroid.app.Activity;
7. importandroid.graphics.Bitmap;
8. importandroid.graphics.BitmapFactory;
9. importandroid.graphics.ColorMatrixColorFilter;
10. importandroid.graphics.Matrix;
11. importandroid.graphics.PixelFormat;
12. importandroid.hardware.Camera;
13. importandroid.hardware.Camera.AutoFocusCallback;
14. importandroid.hardware.Camera.PictureCallback;
15. importandroid.hardware.Camera.ShutterCallback;
16. importandroid.os.Bundle;
17. importandroid.util.Log;
18. importandroid.view.MotionEvent;
19. importandroid.view.SurfaceHolder;
20. importandroid.view.SurfaceView;
21. importandroid.view.View;
22. importandroid.view.View.OnClickListener;
23. importandroid.view.View.OnTouchListener;
24. importandroid.view.ViewGroup.LayoutParams;
25. importandroid.view.Window;
26. importandroid.view.WindowManager;
27. importandroid.widget.ImageButton;
29. publicclassRectPhotoextendsActivityimplementsSurfaceHolder.Callback{
30. privatestaticfinalStringtag="yan";
31. privatebooleanisPreview=false;
32. privateSurfaceViewmPreviewSV=null;//预览SurfaceView
33. privateSurfaceHoldermySurfaceHolder=null;
34. privateImageButtonmPhotoImgBtn=null;
35. privateCameramyCamera=null;
36. privateBitmapmBitmap=null;
37. privateAutoFocusCallbackmyAutoFocusCallback=null;
39. @Override
40. publicvoidonCreate(BundlesavedInstanceState){
41. super.onCreate(savedInstanceState);
42. //设置全屏无标题
43. requestWindowFeature(Window.FEATURE_NO_TITLE);
44. intflag=WindowManager.LayoutParams.FLAG_FULLSCREEN;
45. WindowmyWindow=this.getWindow();
46. myWindow.setFlags(flag,flag);
48. setContentView(R.layout.activity_rect_photo);
50. //初始化SurfaceView
51. mPreviewSV=(SurfaceView)findViewById(R.id.previewSV);
52. mySurfaceHolder=mPreviewSV.getHolder();
53. mySurfaceHolder.setFormat(PixelFormat.TRANSLUCENT);//translucent半透明transparent透明
54. mySurfaceHolder.addCallback(this);
55. mySurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
57. //自动聚焦变量回调
58. myAutoFocusCallback=newAutoFocusCallback(){
60. publicvoidonAutoFocus(booleansuccess,Cameracamera){
61. //TODOAuto-generatedmethodstub
62. if(success)//success表示对焦成功
63. {
64. Log.i(tag,"myAutoFocusCallback:success...");
65. //myCamera.setOneShotPreviewCallback(null);
67. }
68. else
69. {
70. //未对焦成功
71. Log.i(tag,"myAutoFocusCallback:失败了...");
73. }
76. }
77. };
79. mPhotoImgBtn=(ImageButton)findViewById(R.id.photoImgBtn);
80. //手动设置拍照ImageButton的大小为120×120,原图片大小是64×64
81. LayoutParamslp=mPhotoImgBtn.getLayoutParams();
82. lp.width=120;
83. lp.height=120;
84. mPhotoImgBtn.setLayoutParams(lp);
85. mPhotoImgBtn.setOnClickListener(newPhotoOnClickListener());
86. mPhotoImgBtn.setOnTouchListener(newMyOnTouchListener());
89. }
92. /*下面三个是SurfaceHolder.Callback创建的回调函数*/
93. publicvoidsurfaceChanged(SurfaceHolderholder,intformat,intwidth,intheight)
94. //当SurfaceView/预览界面的格式和大小发生改变时，该方法被调用
95. {
96. //TODOAuto-generatedmethodstub
97. Log.i(tag,"SurfaceHolder.Callback:surfaceChanged!");
98. initCamera();
100. }
103. publicvoidsurfaceCreated(SurfaceHolderholder)
104. //SurfaceView启动时/初次实例化，预览界面被创建时，该方法被调用。
105. {
106. //TODOAuto-generatedmethodstub
107. myCamera=Camera.open();
108. try{
109. myCamera.setPreviewDisplay(mySurfaceHolder);
110. Log.i(tag,"SurfaceHolder.Callback:surfaceCreated!");
111. }catch(IOExceptione){
112. //TODOAuto-generatedcatchblock
113. if(null!=myCamera){
114. myCamera.release();
115. myCamera=null;
116. }
117. e.printStackTrace();
118. }
122. }
125. publicvoidsurfaceDestroyed(SurfaceHolderholder)
126. //销毁时被调用
127. {
128. //TODOAuto-generatedmethodstub
129. Log.i(tag,"SurfaceHolder.Callback：SurfaceDestroyed");
130. if(null!=myCamera)
131. {
132. myCamera.setPreviewCallback(null);/*在启动PreviewCallback时这个必须在前不然退出出错。
133. 这里实际上注释掉也没关系*/
135. myCamera.stopPreview();
136. isPreview=false;
137. myCamera.release();
138. myCamera=null;
139. }
141. }
143. //初始化相机
144. publicvoidinitCamera(){
145. if(isPreview){
146. myCamera.stopPreview();
147. }
148. if(null!=myCamera){
149. Camera.ParametersmyParam=myCamera.getParameters();
150. 查询屏幕的宽和高
151. //WindowManagerwm=(WindowManager)getSystemService(Context.WINDOW_SERVICE);
152. //Displaydisplay=wm.getDefaultDisplay();
153. //Log.i(tag,"屏幕宽度："+display.getWidth()+"屏幕高度:"+display.getHeight());
155. myParam.setPictureFormat(PixelFormat.JPEG);//设置拍照后存储的图片格式
157. 查询camera支持的picturesize和previewsize
158. //List<Size>pictureSizes=myParam.getSupportedPictureSizes();
159. //List<Size>previewSizes=myParam.getSupportedPreviewSizes();
160. //for(inti=0;i<pictureSizes.size();i++){
161. //Sizesize=pictureSizes.get(i);
162. //Log.i(tag,"initCamera:摄像头支持的pictureSizes:width="+size.width+"height="+size.height);
163. //}
164. //for(inti=0;i<previewSizes.size();i++){
165. //Sizesize=previewSizes.get(i);
166. //Log.i(tag,"initCamera:摄像头支持的previewSizes:width="+size.width+"height="+size.height);
167. //
168. //}
171. //设置大小和方向等参数
172. myParam.setPictureSize(1280,960);
173. myParam.setPreviewSize(960,720);
174. //myParam.set("rotation",90);
175. myCamera.setDisplayOrientation(90);
176. myParam.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO);
177. myCamera.setParameters(myParam);
178. myCamera.startPreview();
179. myCamera.autoFocus(myAutoFocusCallback);
180. isPreview=true;
181. }
182. }
184. /*为了实现拍照的快门声音及拍照保存照片需要下面三个回调变量*/
185. ShutterCallbackmyShutterCallback=newShutterCallback()
186. //快门按下的回调，在这里我们可以设置类似播放“咔嚓”声之类的操作。默认的就是咔嚓。
187. {
189. publicvoidonShutter(){
190. //TODOAuto-generatedmethodstub
191. Log.i(tag,"myShutterCallback:onShutter...");
193. }
194. };
195. PictureCallbackmyRawCallback=newPictureCallback()
196. //拍摄的未压缩原数据的回调,可以为null
197. {
199. publicvoidonPictureTaken(byte[]data,Cameracamera){
200. //TODOAuto-generatedmethodstub
201. Log.i(tag,"myRawCallback:onPictureTaken...");
203. }
204. };
205. PictureCallbackmyJpegCallback=newPictureCallback()
206. //对jpeg图像数据的回调,最重要的一个回调
207. {
209. publicvoidonPictureTaken(byte[]data,Cameracamera){
210. //TODOAuto-generatedmethodstub
211. Log.i(tag,"myJpegCallback:onPictureTaken...");
212. if(null!=data){
213. mBitmap=BitmapFactory.decodeByteArray(data,0,data.length);//data是字节数据，将其解析成位图
214. myCamera.stopPreview();
215. isPreview=false;
216. }
217. //设置FOCUS_MODE_CONTINUOUS_VIDEO)之后，myParam.set("rotation",90)失效。图片竟然不能旋转了，故这里要旋转下
218. Matrixmatrix=newMatrix();
219. matrix.postRotate((float)90.0);
220. BitmaprotaBitmap=Bitmap.createBitmap(mBitmap,0,0,mBitmap.getWidth(),mBitmap.getHeight(),matrix,false);
221. //保存图片到sdcard
222. if(null!=rotaBitmap)
223. {
224. saveJpeg(rotaBitmap);
225. }
227. //再次进入预览
228. myCamera.startPreview();
229. isPreview=true;
230. }
231. };
232. //拍照按键的监听
233. publicclassPhotoOnClickListenerimplementsOnClickListener{
235. publicvoidonClick(Viewv){
236. //TODOAuto-generatedmethodstub
237. if(isPreview&&myCamera!=null){
238. myCamera.takePicture(myShutterCallback,null,myJpegCallback);
239. }
241. }
243. }
244. /*给定一个Bitmap，进行保存*/
245. publicvoidsaveJpeg(Bitmapbm){
246. StringsavePath="/mnt/sdcard/rectPhoto/";
247. Filefolder=newFile(savePath);
248. if(!folder.exists())//如果文件夹不存在则创建
249. {
250. folder.mkdir();
251. }
252. longdataTake=System.currentTimeMillis();
253. StringjpegName=savePath+dataTake+".jpg";
254. Log.i(tag,"saveJpeg:jpegName--"+jpegName);
255. //FilejpegFile=newFile(jpegName);
256. try{
257. FileOutputStreamfout=newFileOutputStream(jpegName);
258. BufferedOutputStreambos=newBufferedOutputStream(fout);
260. 如果需要改变大小(默认的是宽960×高1280),如改成宽600×高800
261. //BitmapnewBM=bm.createScaledBitmap(bm,600,800,false);
263. bm.compress(Bitmap.CompressFormat.JPEG,100,bos);
264. bos.flush();
265. bos.close();
266. Log.i(tag,"saveJpeg：存储完毕！");
267. }catch(IOExceptione){
268. //TODOAuto-generatedcatchblock
269. Log.i(tag,"saveJpeg:存储失败！");
270. e.printStackTrace();
271. }
272. }
274. /*为了使图片按钮按下和弹起状态不同，采用过滤颜色的方法.按下的时候让图片颜色变淡*/
275. publicclassMyOnTouchListenerimplementsOnTouchListener{
277. publicfinalfloat[]BT_SELECTED=newfloat[]
278. {2,0,0,0,2,
279. 0,2,0,0,2,
280. 0,0,2,0,2,
281. 0,0,0,1,0};
283. publicfinalfloat[]BT_NOT_SELECTED=newfloat[]
284. {1,0,0,0,0,
285. 0,1,0,0,0,
286. 0,0,1,0,0,
287. 0,0,0,1,0};
288. publicbooleanonTouch(Viewv,MotionEventevent){
289. //TODOAuto-generatedmethodstub
290. if(event.getAction()==MotionEvent.ACTION_DOWN){
291. v.getBackground().setColorFilter(newColorMatrixColorFilter(BT_SELECTED));
292. v.setBackgroundDrawable(v.getBackground());
293. }
294. elseif(event.getAction()==MotionEvent.ACTION_UP){
295. v.getBackground().setColorFilter(newColorMatrixColorFilter(BT_NOT_SELECTED));
296. v.setBackgroundDrawable(v.getBackground());
298. }
299. returnfalse;
300. }
302. }
304. @Override
305. publicvoidonBackPressed()
306. //无意中按返回键时要释放内存
307. {
308. //TODOAuto-generatedmethodstub
309. super.onBackPressed();
310. RectPhoto.this.finish();
311. }
312. }

package yan.guoqi.rectphoto;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Matrix;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.AutoFocusCallback;
import android.hardware.Camera.PictureCallback;
import android.hardware.Camera.ShutterCallback;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.ViewGroup.LayoutParams;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageButton;

public class RectPhoto extends Activity implements SurfaceHolder.Callback{
	private static final String tag="yan";
	private boolean isPreview = false;
	private SurfaceView mPreviewSV = null; //预览SurfaceView
	private SurfaceHolder mySurfaceHolder = null;
	private ImageButton mPhotoImgBtn = null;
	private Camera myCamera = null;
	private Bitmap mBitmap = null;
	private AutoFocusCallback myAutoFocusCallback = null;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		//设置全屏无标题
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		int flag = WindowManager.LayoutParams.FLAG_FULLSCREEN;
		Window myWindow = this.getWindow();
		myWindow.setFlags(flag, flag);

		setContentView(R.layout.activity_rect_photo);

		//初始化SurfaceView
		mPreviewSV = (SurfaceView)findViewById(R.id.previewSV);
		mySurfaceHolder = mPreviewSV.getHolder();
		mySurfaceHolder.setFormat(PixelFormat.TRANSLUCENT);//translucent半透明 transparent透明
		mySurfaceHolder.addCallback(this);
		mySurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

		//自动聚焦变量回调
		myAutoFocusCallback = new AutoFocusCallback() {

			public void onAutoFocus(boolean success, Camera camera) {
				// TODO Auto-generated method stub
				if(success)//success表示对焦成功
				{
					Log.i(tag, "myAutoFocusCallback: success...");
					//myCamera.setOneShotPreviewCallback(null);

				}
				else
				{
					//未对焦成功
					Log.i(tag, "myAutoFocusCallback: 失败了...");

				}


			}
		};

		mPhotoImgBtn = (ImageButton)findViewById(R.id.photoImgBtn);
		//手动设置拍照ImageButton的大小为120×120,原图片大小是64×64
		LayoutParams lp = mPhotoImgBtn.getLayoutParams();
		lp.width = 120;
		lp.height = 120;		
		mPhotoImgBtn.setLayoutParams(lp);				
		mPhotoImgBtn.setOnClickListener(new PhotoOnClickListener());
		mPhotoImgBtn.setOnTouchListener(new MyOnTouchListener());


	}


	/*下面三个是SurfaceHolder.Callback创建的回调函数*/
	public void surfaceChanged(SurfaceHolder holder, int format, int width,int height) 
	// 当SurfaceView/预览界面的格式和大小发生改变时，该方法被调用
	{
		// TODO Auto-generated method stub		
		Log.i(tag, "SurfaceHolder.Callback:surfaceChanged!");
		initCamera();

	}


	public void surfaceCreated(SurfaceHolder holder) 
	// SurfaceView启动时/初次实例化，预览界面被创建时，该方法被调用。
	{
		// TODO Auto-generated method stub		
		myCamera = Camera.open();
		try {
			myCamera.setPreviewDisplay(mySurfaceHolder);
			Log.i(tag, "SurfaceHolder.Callback: surfaceCreated!");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			if(null != myCamera){
				myCamera.release();
				myCamera = null;
			}
			e.printStackTrace();
		}



	}


	public void surfaceDestroyed(SurfaceHolder holder) 
	//销毁时被调用
	{
		// TODO Auto-generated method stub
		Log.i(tag, "SurfaceHolder.Callback：Surface Destroyed");
		if(null != myCamera)
		{
			myCamera.setPreviewCallback(null); /*在启动PreviewCallback时这个必须在前不然退出出错。
			这里实际上注释掉也没关系*/
			
			myCamera.stopPreview(); 
			isPreview = false; 
			myCamera.release();
			myCamera = null;     
		}

	}

	//初始化相机
	public void initCamera(){
		if(isPreview){
			myCamera.stopPreview();
		}
		if(null != myCamera){			
			Camera.Parameters myParam = myCamera.getParameters();
			//			//查询屏幕的宽和高
			//			WindowManager wm = (WindowManager)getSystemService(Context.WINDOW_SERVICE);
			//			Display display = wm.getDefaultDisplay();
			//			Log.i(tag, "屏幕宽度："+display.getWidth()+" 屏幕高度:"+display.getHeight());

			myParam.setPictureFormat(PixelFormat.JPEG);//设置拍照后存储的图片格式

			//			//查询camera支持的picturesize和previewsize
			//			List<Size> pictureSizes = myParam.getSupportedPictureSizes();
			//			List<Size> previewSizes = myParam.getSupportedPreviewSizes();
			//			for(int i=0; i<pictureSizes.size(); i++){
			//				Size size = pictureSizes.get(i);
			//				Log.i(tag, "initCamera:摄像头支持的pictureSizes: width = "+size.width+"height = "+size.height);
			//			}
			//			for(int i=0; i<previewSizes.size(); i++){
			//				Size size = previewSizes.get(i);
			//				Log.i(tag, "initCamera:摄像头支持的previewSizes: width = "+size.width+"height = "+size.height);
			//
			//			}


			//设置大小和方向等参数
			myParam.setPictureSize(1280, 960);
			myParam.setPreviewSize(960, 720);			
			//myParam.set("rotation", 90);  			
			myCamera.setDisplayOrientation(90);  
			myParam.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO);
			myCamera.setParameters(myParam);			
			myCamera.startPreview();
			myCamera.autoFocus(myAutoFocusCallback);
			isPreview = true;
		}
	}

	/*为了实现拍照的快门声音及拍照保存照片需要下面三个回调变量*/
	ShutterCallback myShutterCallback = new ShutterCallback() 
	//快门按下的回调，在这里我们可以设置类似播放“咔嚓”声之类的操作。默认的就是咔嚓。
	{

		public void onShutter() {
			// TODO Auto-generated method stub
			Log.i(tag, "myShutterCallback:onShutter...");

		}
	};
	PictureCallback myRawCallback = new PictureCallback() 
	// 拍摄的未压缩原数据的回调,可以为null
	{

		public void onPictureTaken(byte[] data, Camera camera) {
			// TODO Auto-generated method stub
			Log.i(tag, "myRawCallback:onPictureTaken...");

		}
	};
	PictureCallback myJpegCallback = new PictureCallback() 
	//对jpeg图像数据的回调,最重要的一个回调
	{

		public void onPictureTaken(byte[] data, Camera camera) {
			// TODO Auto-generated method stub
			Log.i(tag, "myJpegCallback:onPictureTaken...");
			if(null != data){
				mBitmap = BitmapFactory.decodeByteArray(data, 0, data.length);//data是字节数据，将其解析成位图
				myCamera.stopPreview();
				isPreview = false;
			}
			//设置FOCUS_MODE_CONTINUOUS_VIDEO)之后，myParam.set("rotation", 90)失效。图片竟然不能旋转了，故这里要旋转下
			Matrix matrix = new Matrix();
			matrix.postRotate((float)90.0);
			Bitmap rotaBitmap = Bitmap.createBitmap(mBitmap, 0, 0, mBitmap.getWidth(), mBitmap.getHeight(), matrix, false);
			//保存图片到sdcard
			if(null != rotaBitmap)
			{
				saveJpeg(rotaBitmap);
			}

			//再次进入预览
			myCamera.startPreview();
			isPreview = true;
		}
	};
	//拍照按键的监听
	public class PhotoOnClickListener implements OnClickListener{

		public void onClick(View v) {
			// TODO Auto-generated method stub
			if(isPreview && myCamera!=null){
				myCamera.takePicture(myShutterCallback, null, myJpegCallback);	
			}

		}

	}
	/*给定一个Bitmap，进行保存*/
	public void saveJpeg(Bitmap bm){
		String savePath = "/mnt/sdcard/rectPhoto/";
		File folder = new File(savePath);
		if(!folder.exists()) //如果文件夹不存在则创建
		{
			folder.mkdir();
		}
		long dataTake = System.currentTimeMillis();
		String jpegName = savePath + dataTake +".jpg";
		Log.i(tag, "saveJpeg:jpegName--" + jpegName);
		//File jpegFile = new File(jpegName);
		try {
			FileOutputStream fout = new FileOutputStream(jpegName);
			BufferedOutputStream bos = new BufferedOutputStream(fout);

			//			//如果需要改变大小(默认的是宽960×高1280),如改成宽600×高800
			//			Bitmap newBM = bm.createScaledBitmap(bm, 600, 800, false);

			bm.compress(Bitmap.CompressFormat.JPEG, 100, bos);
			bos.flush();
			bos.close();
			Log.i(tag, "saveJpeg：存储完毕！");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			Log.i(tag, "saveJpeg:存储失败！");
			e.printStackTrace();
		}
	}

	/*为了使图片按钮按下和弹起状态不同，采用过滤颜色的方法.按下的时候让图片颜色变淡*/
	public class MyOnTouchListener implements OnTouchListener{

		public final  float[] BT_SELECTED=new float[]
				{ 2, 0, 0, 0, 2,
			0, 2, 0, 0, 2,
			0, 0, 2, 0, 2,
			0, 0, 0, 1, 0 };			    

		public final float[] BT_NOT_SELECTED=new float[]
				{ 1, 0, 0, 0, 0,
			0, 1, 0, 0, 0,
			0, 0, 1, 0, 0,
			0, 0, 0, 1, 0 };
		public boolean onTouch(View v, MotionEvent event) {
			// TODO Auto-generated method stub
			if(event.getAction() == MotionEvent.ACTION_DOWN){
				v.getBackground().setColorFilter(new ColorMatrixColorFilter(BT_SELECTED));
				v.setBackgroundDrawable(v.getBackground());
			}
			else if(event.getAction() == MotionEvent.ACTION_UP){
				v.getBackground().setColorFilter(new ColorMatrixColorFilter(BT_NOT_SELECTED));
				v.setBackgroundDrawable(v.getBackground());
				
			}
			return false;
		}

	}
	
	@Override
	public void onBackPressed()
	//无意中按返回键时要释放内存
	{
		// TODO Auto-generated method stub
		super.onBackPressed();
		RectPhoto.this.finish();
	}
}

源码下载链接： http://download.youkuaiyun.com/detail/yanzi1225627/5060323

欢迎android爱好者加群248217350，备注：yanzi

注：代码不能正常运行的请看上面第4条，修改相关参数。
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