<ImageView
  Android:id="@+id/start"
  android:layout_width="150.px"
  android:layout_height="80.px"
  android:src="@drawable/start"
  android:layout_x="120.0px"
  android:layout_y="250.0px"
/>

public class two extends Activity implements OnClickListener{
private ImageView start =null; // 開始
protected boolean isBrewing = false; // 按鈕置換
public void onCreate(Bundle savedInstanceState) {
    //設置全屏
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,      WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setContentView(R.layout.two);
    // 綁定
    start = (ImageView) findViewById(R.id.start);
  start.setOnClickListener(this);
}
//開始
public void startView(){
Bitmap bmp=BitmapFactory.decodeResource(getResources(), R.drawable.stop);//打開資源圖片
    start.setImageBitmap(bmp);
    isBrewing = true;
}
//停止
public void stopView(){
Bitmap bmp=BitmapFactory.decodeResource(getResources(), R.drawable.start);//打開資源圖片
    start.setImageBitmap(bmp);
    isBrewing = false;
}
  @Override
  public void onClick(View v) {
    if(v==start){
      if(isBrewing)
        stopView();
      else
        startView();
    }
  }
}