static final int PICKED_ONE = 0;

static final int PICKED_TWO = 1;

 boolean onePicked = false;

boolean twoPicked = false;

 Button choosePicture1, choosePicture2;

 我们将有一个ImageView用于显示最终的合成图像。同时还需要有两个位图对象，为每幅选定的图像使用一个该对象。

 mageView compositeImageView;

 Bitmap bmp1, bmp2;

 与前面的示例一样，将需要一个在其上绘制的Canvas对象和一个进行绘制的Paint对象。

 Canvas canvas;

Paint paint;

 

@Override

public void onCreate(Bundle savedInstanceState) {

     super.onCreate(savedInstanceState);

     setContentView(R.layout.main);

 compositeImageView = (ImageView) this.findViewById(R.id.CompositeImageView);choosePicture1 = (Button) this.findViewById(R.id.ChoosePictureButton1);

     choosePicture2 = (Button) this.findViewById(R.id.ChoosePictureButton2);

  choosePicture1.setOnClickListener(this);

  choosePicture2.setOnClickListener(this);

 

}