Android游戏开发学习笔记（四）：Camera图像采集(2)

public class MainActivity extends Activity implements SurfaceHolder.Callback { 
    Camera myCamera; 
    SurfaceView mySurfaceView; 
    SurfaceHolder mySurfaceHolder; 
    Button btn1, btn2; 
    boolean isPreview = false; 
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.main); 
        mySurfaceView = (SurfaceView) findViewById(R.id.surfaceView); 
        btn1 = (Button) findViewById(R.id.btn1); 
        btn2 = (Button) findViewById(R.id.btn2); 
        mySurfaceHolder = mySurfaceView.getHolder(); 
        mySurfaceHolder.addCallback(this); 
        mySurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); 
        btn1.setOnClickListener(new OnClickListener() { 
            @Override
            public void onClick(View v) { 
                initCamera(); 
            } 
        }); 
        btn2.setOnClickListener(new OnClickListener() { 
            @Override
            public void onClick(View v) { 
                if (myCamera != null && isPreview) { 
                    myCamera.stopPreview(); 
                    myCamera.release(); 
                    myCamera = null; 
                    isPreview = false; 
                }