Android Camera相机功能实现 拍照并保存图片

AndroidManifest.xml

    <uses-feature android:name="android.hardware.camera"/>
    <uses-feature android:name="android.hardware.camera.autofocus" />
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <Button
        android:id="@+id/btn_camera"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Camera" />
    
    <SurfaceView 
        android:id="@+id/mySurfaceView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        />
</LinearLayout>

MainActivity.java

public class MainActivity extends Activity {
    private Button btnCamera=null;
    private SurfaceView mySurfaceView =null;
    private Camera cam=null;
    private SurfaceHolder holder=null;
    private boolean previewRunning=false;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        this.btnCamera=(Button)super.findViewById(R.id.btn_camera);
        this.mySurfaceView=(SurfaceView)super.findViewById(R.id.mySurfaceView);
        this.btnCamera.setOnClickListener(new OnClickListenerImpl());
        this.holder=this.mySurfaceView.getHolder();
        this.holder.addCallback(new MySurfaceViewCallback());
        this.holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        this.holder.setFixedSize(800, 480);
    }
    private class OnClickListenerImpl implements OnClickListener{

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            if(MainActivity.this.cam!=null){
                MainActivity.this.cam.autoFocus(new AutoFocusCallbackImpl());
            }
        }
        
    }
    
    private class MySurfaceViewCallback implements SurfaceHolder.Callback {

        @Override
        public void surfaceChanged(SurfaceHolder holder, int format, int width,
                int height) {
            // TODO Auto-generated method stub
            
        }

        @Override
        public void surfaceCreated(SurfaceHolder holder) {
            // TODO Auto-generated method stub
            MainActivity.this.cam=Camera.open(); //取第一个摄像头
            WindowManager manager=(WindowManager)MainActivity.this.getSystemService(Context.WINDOW_SERVICE);
            Display display=manager.getDefaultDisplay();
            Parameters param=MainActivity.this.cam.getParameters();
            param.setPreviewSize(display.getWidth(), display.getHeight());
            param.setPreviewFrameRate(5);//一秒5帧
            param.setPictureFormat(PixelFormat.JPEG);
            param.set("jpeg-quality", 80);
            MainActivity.this.cam.setParameters(param);
            try {
                MainActivity.this.cam.setPreviewDisplay(MainActivity.this.holder);
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            MainActivity.this.cam.startPreview();//预览
            MainActivity.this.previewRunning=true;
        }

        @Override
        public void surfaceDestroyed(SurfaceHolder holder) {
            // TODO Auto-generated method stub
            if(MainActivity.this.cam!=null){
                if(MainActivity.this.previewRunning){
                    MainActivity.this.cam.stopPreview();
                    MainActivity.this.previewRunning=false;
                }
                MainActivity.this.cam.release();//释放摄像头
            }
        }
    }
    private class AutoFocusCallbackImpl implements AutoFocusCallback{

        @Override
        public void onAutoFocus(boolean success, Camera camera) {
            // 对焦操作
            if(success){
                MainActivity.this.cam.takePicture(sc, pc, jpegcall);
            }
        }
        
    }
    private PictureCallback jpegcall=new PictureCallback() {
        
        @Override
        public void onPictureTaken(byte[] data, Camera camera) {
            // 保存图片操作
            Bitmap bmp=BitmapFactory.decodeByteArray(data, 0, data.length);
            String fileName=Environment.getExternalStorageDirectory().toString()
                    +File.separator
                    +"AppTest"
                    +File.separator
                    +"PicTest_"+System.currentTimeMillis()+".jpg";
            File file=new File(fileName);
            if(!file.getParentFile().exists()){
                file.getParentFile().mkdir();//创建文件夹
            }
            try {
                BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream(file));
                bmp.compress(Bitmap.CompressFormat.JPEG, 80, bos);//向缓冲区压缩图片
                bos.flush();
                bos.close();
                Toast.makeText(MainActivity.this, "拍照成功，照片保存在"+fileName+"文件之中！", Toast.LENGTH_LONG).show();
            } catch (Exception e) {
                // TODO Auto-generated catch block
                //e.printStackTrace();
                Toast.makeText(MainActivity.this, "拍照失败！"+e.toString(), Toast.LENGTH_LONG).show();
            }
            MainActivity.this.cam.stopPreview();
            MainActivity.this.cam.startPreview();
        }
    };
    private ShutterCallback sc=new ShutterCallback() {
        
        @Override
        public void onShutter() {
            // 按下快门之后进行的操作
            
        }
    };
    private PictureCallback pc=new PictureCallback() {
        
        @Override
        public void onPictureTaken(byte[] data, Camera camera) {
            // TODO Auto-generated method stub
            
        }
    };