surfaceCreated synchronized(getHolder()) drawCircle

SurfaceView와 그 부속 함수 사용 정리가 필요하다.

이것 저것 테스트한 코드를 쌓았다.

public class MySurfaceVwActy extends Activity {
	private static final String TAG = MySurfaceVwActy.class.getSimpleName();
	
	SurfaceView surfaceView;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
//		requestWindowFeature(Window.FEATURE_NO_TITLE); //setContentView 앞|뒤에 오면? 에러!!
//		setContentView(R.layout.activity_my_surface_view);
		

        Log.d(TAG, "*********************************************************");
        Log.d(TAG, "*********************************************************");

        TestView surfaceEvent = new TestView(getApplicationContext());
//        TestView surfaceEvent = new TestView(MyTestViewActy.this);
//        surfaceEvent.setZOrderOnTop(true);    
//        surfaceEvent.getHolder().setFormat(PixelFormat.TRANSPARENT);        
//        addContentView(surfaceEvent, new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
        setContentView(surfaceEvent);

        Button buttonStartCameraPreview = (Button)findViewById(R.id.startcamerapreview);
        Button buttonStopCameraPreview = (Button)findViewById(R.id.stopcamerapreview);

        Log.d(TAG, "onCreate() end");
	}	
}

class TestView extends SurfaceView implements SurfaceHolder.Callback {
	private static final String TAG_sfvw = MySurfaceVwActy.class.getSimpleName();
	
	private SurfaceHolder mHolder;
	
	public TestView(Context context) {
		super(context);
		Log.d(TAG_sfvw, "Surface() ");
		
		mHolder = getHolder();
		mHolder.addCallback(this);	
	}

	@Override
	public void surfaceCreated(SurfaceHolder holder) {
		Log.d(TAG_sfvw, "surfaceCreated() ");
		
          android.graphics.Canvas cnvs = null;        
          try
          {
        	cnvs = getHolder().lockCanvas(null);
             
              synchronized(getHolder())
              {
                android.graphics.Paint pnt = new android.graphics.Paint();
                pnt.setColor(android.graphics.Color.GREEN);
                cnvs.drawCircle(100, 100, 50, pnt);
              }
          }
          finally
          {
              if(cnvs != null) getHolder().unlockCanvasAndPost(cnvs);
          }  
	}
	
	@Override
	public void surfaceChanged(SurfaceHolder holder, int format, int width,
			int height) {
		Log.d(TAG_sfvw, "surfaceChanged() ");
	}
	@Override
	public void surfaceDestroyed(SurfaceHolder holder) {
		Log.d(TAG_sfvw, "surfaceDestroyed() ");
	}
}