Android开发之系统相机相册使用

获取图片后进行处理，对分辨率较大的进行缩放，较小的原图显示

1、调用系统相机

[java]  view plain copy print ?

1. Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);// 调用系统相机  
2. new DateFormat();  
3. name = DateFormat.format("yyyyMMdd_hhmmss",  
4.                 Calendar.getInstance(Locale.CHINA))  
5.                 + ".jpg";  
6. Uri imageUri = Uri.fromFile(new File(PATH, name));  
7.   
8. intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);//把照片保存在sd卡中指定位置。  
9.   
10. startActivityForResult(intent, CAMERA_TAKE);  

2、调用系统相册

[java]  view plain copy print ?

1. Intent intent = new Intent(Intent.ACTION_GET_CONTENT);  
2. intent.setType("image/*");  
3. startActivityForResult(intent, CAMERA_SELECT);  

3、在onActivityResult方法处理得到的图片

看源码吧。。。

首先简单的布局文件

[java]  view plain copy print ?

1. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
2.     xmlns:tools="http://schemas.android.com/tools"  
3.     android:layout_width="match_parent"  
4.     android:layout_height="match_parent"  
5.     android:orientation="vertical" >  
6.   
7.     <Button  
8.         android:id="@+id/btn_take"  
9.         android:layout_width="match_parent"  
10.         android:layout_height="wrap_content"  
11.         android:text="@string/take" />  
12.   
13.     <Button  
14.         android:id="@+id/btn_select"  
15.         android:layout_width="match_parent"  
16.         android:layout_height="wrap_content"  
17.         android:text="@string/selectFrom" />  
18.   
19.     <ScrollView  
20.         android:id="@+id/sv_show"  
21.         android:layout_width="match_parent"  
22.         android:layout_height="match_parent" >  
23.   
24.         <LinearLayout  
25.             android:id="@+id/ll_show"  
26.             android:layout_width="match_parent"  
27.             android:layout_height="match_parent"  
28.             android:orientation="vertical" >  
29.         </LinearLayout>  
30.     </ScrollView>  
31.   
32. </LinearLayout>  

源码

[java]  view plain copy print ?

1. public class MainActivity extends Activity {  
2.   
3.     private Button btn_take, btn_select;  
4.     private LinearLayout ll_show;  
5.   
6.     // 请求  
7.     private static final int CAMERA_TAKE = 1;  
8.     private static final int CAMERA_SELECT = 2;  
9.   
10.     // 图片名  
11.     public String name;  
12.   
13.     // 存储路径  
14.     private static final String PATH = Environment  
15.             .getExternalStorageDirectory() + "/DCIM";  
16.   
17.     private boolean isBig = false;  
18.   
19.   
20.     @Override  
21.     protected void onCreate(Bundle savedInstanceState) {  
22.         super.onCreate(savedInstanceState);  
23.         setContentView(R.layout.activity_main);  
24.   
25.         btn_take = (Button) findViewById(R.id.btn_take);  
26.         btn_select = (Button) findViewById(R.id.btn_select);  
27.         ll_show = (LinearLayout) findViewById(R.id.ll_show);  
28.   
29.         btn_take.setOnClickListener(new OnClickListener() {  
30.   
31.             @Override  
32.             public void onClick(View v) {  
33.                 takePhoto();  
34.             }  
35.         });  
36.   
37.         btn_select.setOnClickListener(new OnClickListener() {  
38.   
39.             @Override  
40.             public void onClick(View v) {  
41.                 Intent intent = new Intent(Intent.ACTION_GET_CONTENT);  
42.                 intent.setType("image/*");  
43.                 startActivityForResult(intent, CAMERA_SELECT);  
44.             }  
45.         });  
46.   
47.     }  
48.   
49.     public void takePhoto() {  
50.         Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);// 调用系统相机  
51.         new DateFormat();  
52.         name = DateFormat.format("yyyyMMdd_hhmmss",  
53.                 Calendar.getInstance(Locale.CHINA))  
54.                 + ".jpg";  
55.         Uri imageUri = Uri.fromFile(new File(PATH, name));  
56.   
57.         intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);  
58.   
59.         startActivityForResult(intent, CAMERA_TAKE);  
60.     }  
61.   
62.     @Override  
63.     protected void onActivityResult(int requestCode, int resultCode, Intent data) {  
64.         super.onActivityResult(requestCode, resultCode, data);  
65.   
66.         if (resultCode == RESULT_OK) {  
67.             switch (requestCode) {  
68.             case CAMERA_TAKE:  
69.                 Bitmap bitmap = BitmapFactory.decodeFile(PATH + "/" + name);  
70.                 Toast.makeText(this, name, Toast.LENGTH_LONG).show();  
71.                 System.out.println(bitmap.getHeight() + "======"  
72.                         + bitmap.getWidth());  
73.   
74.                 // 获取屏幕分辨率  
75.                 DisplayMetrics dm = new DisplayMetrics();  
76.                 getWindowManager().getDefaultDisplay().getMetrics(dm);  
77.   
78.                 // 图片分辨率与屏幕分辨率  
79.                 float scale = bitmap.getWidth() / (float) dm.widthPixels;  
80.   
81.                 Bitmap newBitMap = null;  
82.                 if (scale > 1) {  
83.                     newBitMap = zoomBitmap(bitmap, bitmap.getWidth() / scale,  
84.                             bitmap.getHeight() / scale);  
85.                     bitmap.recycle();  
86.                     isBig = true;  
87.                 }  
88.                 //添加relative布局放置img，btn  
89.                 final RelativeLayout rl_show_2 = new RelativeLayout(this);  
90.                 rl_show_2.setLayoutParams(new LayoutParams(  
91.                         RelativeLayout.LayoutParams.WRAP_CONTENT,  
92.                         RelativeLayout.LayoutParams.WRAP_CONTENT));  
93.   
94.                 ImageButton imgBtn_del_2 = new ImageButton(this);  
95.                 imgBtn_del_2.setBackgroundResource(android.R.drawable.ic_delete);  
96.   
97.                 //设置按钮的布局规则   
98.                 RelativeLayout.LayoutParams rl_2 = new RelativeLayout.LayoutParams(  
99.                         new LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,  
100.                                 RelativeLayout.LayoutParams.WRAP_CONTENT));  
101.                 rl_2.addRule(RelativeLayout.ALIGN_PARENT_TOP);  
102.                 rl_2.addRule(RelativeLayout.ALIGN_RIGHT, 2);  
103.                   
104.                   
105.                 // 将图片显示到界面  
106.                 ImageView img = new ImageView(this);  
107.                 img.setId(2);  
108.                 img.setLayoutParams(new LayoutParams(  
109.                         LinearLayout.LayoutParams.WRAP_CONTENT,  
110.                         LinearLayout.LayoutParams.WRAP_CONTENT));  
111.                 img.setScaleType(ImageView.ScaleType.CENTER_CROP);  
112.                 img.setPadding(2, 0, 0, 5);  
113.                 if (isBig) {  
114.                     img.setImageBitmap(newBitMap);  
115.                     isBig = false;  
116.                 } else  
117.                     img.setImageBitmap(bitmap);  
118.                   
119.                 rl_show_2.addView(img);  
120.                 rl_show_2.addView(imgBtn_del_2,rl_2);  
121.                   
122.                   
123.                 ll_show.addView(rl_show_2);  
124.                   
125.                 imgBtn_del_2.setOnClickListener(new OnClickListener() {  
126.                       
127.                     @Override  
128.                     public void onClick(View v) {  
129.                         ll_show.removeView(rl_show_2);  
130.                     }  
131.                 });  
132.                   
133.                 break;  
134.   
135.             case CAMERA_SELECT:  
136.                 ContentResolver resolver = getContentResolver();  
137.   
138.                 // 照片的原始资源地址  
139.                 Uri imgUri = data.getData();  
140.   
141.                 try {  
142.                     // 使用ContentProvider通过Uri获取原始图片  
143.                     Bitmap photo = MediaStore.Images.Media.getBitmap(resolver,  
144.                             imgUri);  
145.   
146.                     // 获取屏幕分辨率  
147.                     DisplayMetrics dm_2 = new DisplayMetrics();  
148.                     getWindowManager().getDefaultDisplay().getMetrics(dm_2);  
149.   
150.                     // 图片分辨率与屏幕分辨率  
151.                     float scale_2 = photo.getWidth() / (float) dm_2.widthPixels;  
152.   
153.                     Bitmap newBitMap_2 = null;  
154.                     if (scale_2 > 1) {  
155.                         newBitMap_2 = zoomBitmap(photo, photo.getWidth()  
156.                                 / scale_2, photo.getHeight() / scale_2);  
157.                         photo.recycle();  
158.                         isBig = true;  
159.                     }  
160.   
161.                     final RelativeLayout rl_show = new RelativeLayout(this);  
162.                     rl_show.setLayoutParams(new LayoutParams(  
163.                             RelativeLayout.LayoutParams.WRAP_CONTENT,  
164.                             RelativeLayout.LayoutParams.WRAP_CONTENT));  
165.   
166.                     ImageButton imgBtn_del = new ImageButton(this);  
167.                     imgBtn_del.setBackgroundResource(android.R.drawable.ic_delete);  
168.   
169.                     //设置按钮的布局规则   
170.                     RelativeLayout.LayoutParams rl = new RelativeLayout.LayoutParams(  
171.                             new LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,  
172.                                     RelativeLayout.LayoutParams.WRAP_CONTENT));  
173.                     rl.addRule(RelativeLayout.ALIGN_PARENT_TOP);  
174.                     rl.addRule(RelativeLayout.ALIGN_RIGHT, 1);  
175.   
176.                     // 将图片显示到界面  
177.                     ImageView img_2 = new ImageView(this);  
178.                     img_2.setId(1);  
179.                     img_2.setLayoutParams(new LayoutParams(  
180.                             LinearLayout.LayoutParams.WRAP_CONTENT,  
181.                             LinearLayout.LayoutParams.WRAP_CONTENT));  
182.                     img_2.setScaleType(ImageView.ScaleType.CENTER_CROP);  
183.                     img_2.setPadding(2, 0, 0, 5);  
184.                     if (scale_2 > 1) {  
185.                         img_2.setImageBitmap(newBitMap_2);  
186.                         isBig = false;  
187.                     } else  
188.                         img_2.setImageBitmap(photo);  
189.                       
190.                     //将img，btn添加  
191.                     rl_show.addView(img_2);  
192.                     rl_show.addView(imgBtn_del,rl);  
193.   
194.                     ll_show.addView(rl_show);  
195.   
196.                     imgBtn_del.setOnClickListener(new OnClickListener() {  
197.   
198.                         @Override  
199.                         public void onClick(View v) {  
200.                             ll_show.removeView(rl_show);  
201.                         }  
202.                     });  
203.   
204.                 } catch (Exception e) {  
205.                     // TODO: handle exception  
206.                 }  
207.   
208.                 break;  
209.             }  
210.         }  
211.     }  
212.   
213.     // 对分辨率较大的图片进行缩放  
214.     public Bitmap zoomBitmap(Bitmap bitmap, float width, float height) {  
215.   
216.         int w = bitmap.getWidth();  
217.   
218.         int h = bitmap.getHeight();  
219.   
220.         Matrix matrix = new Matrix();  
221.   
222.         float scaleWidth = ((float) width / w);  
223.   
224.         float scaleHeight = ((float) height / h);  
225.   
226.         matrix.postScale(scaleWidth, scaleHeight);// 利用矩阵进行缩放不会造成内存溢出  
227.   
228.         Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, w, h, matrix, true);  
229.   
230.         return newbmp;  
231.   
232.     }  
233. }  

ok，结束。。