public class MainActivity extends ActionBarActivity {
private ImageView iv;
private Bitmap srcbmp;
private Bitmap alterBmp;
private Canvas canvas;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
iv = (ImageView) findViewById(R.id.iv);
srcbmp = BitmapFactory.decodeResource(getResources(), R.drawable.pre);
alterBmp = Bitmap.createBitmap(srcbmp.getWidth(), srcbmp.getHeight(), srcbmp.getConfig());
canvas = new Canvas(alterBmp);
Paint paint = new Paint();
paint.setColor(Color.BLACK);
Matrix matrix = new Matrix();
canvas.drawBitmap(srcbmp, matrix, paint);
iv.setImageBitmap(alterBmp);
iv.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
break;
case MotionEvent.ACTION_MOVE:
// event.getRawX(); 离屏幕的距离
int x = (int) event.getX();
int y = (int) event.getY();
System.out.println("设置(" + x + "," + y + ")为透明");
for (int i = -4; i < 5; i++) {
for (int j = -4; j < 5; j++) {
try {
alterBmp.setPixel(x + i, y + j, 0);
} catch (Exception e) {
e.printStackTrace();
}
}
}
iv.setImageBitmap(alterBmp);
break;
case MotionEvent.ACTION_UP:
// MediaPlayer.create(getApplicationContext(), R.raw.higirl
// ).start();
break;
}
return true; // 可以重复循环的处理事件
}
});
}
}
