static final int PICKED_ONE = 0;

static final int PICKED_TWO = 1;

 boolean onePicked = false;

boolean twoPicked = false;

 Button choosePicture1, choosePicture2;

 我們將有一個ImageView用于顯示最終的合成圖像。同時還需要有兩個位圖對象，為每幅選定的圖像使用一個該對象。

 mageView compositeImageView;

 Bitmap bmp1, bmp2;

 與前面的示例一樣，將需要一個在其上繪制的Canvas對象和一個進行繪制的Paint對象。

 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);

 

}