android 照相源码

package com.huawei.demo;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.hardware.Camera.ShutterCallback;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

public class CameraDemo extends Activity implements SurfaceHolder.Callback
{
private Camera camera;
private Button previewBtn,closeBtn,takeBtn;

//作为review照下来的相片之用
private ImageView imageView;
private String TAG = "FENG";
private SurfaceView surfaceView;
private SurfaceHolder surfaceHolder;

//默认相机预览模式为false
private boolean isPreview = false;

private String strCaptureFilePath = "/sdcard/camera.jpg";

private ShutterCallback shutter = new ShutterCallback()
{
@Override
public void onShutter()
{

}
};

private PictureCallback raw = new PictureCallback()
{
@Override
public void onPictureTaken(byte[] arg0, Camera arg1)
{

}
};

private PictureCallback jpgCallback = new PictureCallback()
{
@Override
public void onPictureTaken(byte[] data, Camera camera)
{
Bitmap bm = BitmapFactory.decodeByteArray(data, 0, data.length);
File myCaptureFile = new File(strCaptureFilePath);
try
{
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(myCaptureFile));

//采用压缩转档方法
bm.compress(Bitmap.CompressFormat.JPEG, 80, bos);
bos.flush();
bos.close();

//将拍照下来且存储完毕的图文件，显示出来
imageView.setImageBitmap(bm);

//显示完图文件，立即重置相机，并关闭预览
resetCamera();

initCamera();
}
catch(Exception e)
{
Log.i(TAG, e.toString());
}
}
};
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);

//隐藏状态栏
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

//隐藏标题栏
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.camerademo);

if(!this.checkSDCard())
{
this.makeTextToast(this.getResources().getText(R.string.error_code).toString(), true);
}

//取得屏幕解析像素
DisplayMetrics dm = new DisplayMetrics();
this.getWindowManager().getDefaultDisplay().getMetrics(dm);

// textView = (TextView) this.findViewById(R.id.txtView1);
imageView = (ImageView) this.findViewById(R.id.imageView);
surfaceView = (SurfaceView) this.findViewById(R.id.surfaceView1);
surfaceHolder = surfaceView.getHolder();

surfaceHolder.addCallback(CameraDemo.this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

previewBtn = (Button) this.findViewById(R.id.previewBtn);
closeBtn = (Button) this.findViewById(R.id.closeBtn);
takeBtn = (Button) this.findViewById(R.id.takeBtn);

previewBtn.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View arg0)
{
//自定义初始化打开相机函数
initCamera();
}
});

closeBtn.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
//自定义重置相机，并关闭相机预览函数
resetCamera();
}
});

takeBtn.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
takePicture();
}
});
}

@Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3)
{
Log.i(TAG, "surface changed");
}

@Override
public void surfaceCreated(SurfaceHolder arg0)
{
Log.i(TAG, "surface create");
}

@Override
public void surfaceDestroyed(SurfaceHolder arg0)
{
Log.i(TAG, "surface destory");
}

private void initCamera()
{
if(!isPreview)
{
try
{
camera = Camera.open();
}
catch(Exception e)
{
Log.i(TAG, "camera open...");
}

if(camera != null && !isPreview)
{
Log.i(TAG,"inside the camera");

//创建Camera.Parameters对象
Camera.Parameters params = camera.getParameters();
params.setPictureFormat(PixelFormat.JPEG);
params.setFlashMode(Camera.Parameters.FLASH_MODE_ON);

//指定preview的屏幕大小
params.setPreviewSize(320, 240);

//设置图片分辨率大小
params.setPictureSize(320, 240);

camera.setParameters(params);
try
{
camera.setPreviewDisplay(surfaceHolder);
} catch (IOException e)
{
Log.i(TAG, e.toString());
}

camera.startPreview();
isPreview = true;
}
}
}

private void takePicture()
{
if(camera != null && isPreview)
{
camera.takePicture(shutter, raw, jpgCallback);
}
}

private void resetCamera()
{
if(camera != null && isPreview)
{
camera.stopPreview();
camera.release();
camera = null;
isPreview = false;

}
}

private void makeTextToast(String str, boolean isLong)
{
Toast.makeText(CameraDemo.this, str, Toast.LENGTH_LONG).show();
}

private boolean checkSDCard()
{
if(android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED))
{
return true;
}
return false;
}
}