android實現水波紋效果的例子

public class AnimActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(new PlasmaView(this));
    }
}

class PlasmaView extends View implements View.OnTouchListener{

    private Bitmap mBitmap;
    long time;
    long fps;

public PlasmaView(Context context) {
    super(context);        
    Bitmap bmp = BitmapFactory.decodeResource(this.getResources(),R.drawable.mm);
    mBitmap = Bitmap.createBitmap(bmp.getWidth(), bmp.getHeight(), Bitmap.Config.RGB_565);
    AnimRender.setBitmap(bmp);
    this.setOnTouchListener(this);
}

@Override 
protected void onDraw(Canvas canvas) {
    long ct = System.currentTimeMillis();
    if(ct - time > 1000){
        Log.v("Fps:" + String.valueOf(fps));
        time = ct;
        fps = 0;
    }
    //fps++;
    fps += 20;

    AnimRender.render(mBitmap);     
    canvas.drawBitmap(mBitmap, 0, 0, null);
    postInvalidate();
}

@Override
public boolean onTouch(View v, MotionEvent event) {
    // TODO Auto-generated method stub
    AnimRender.drop((int)event.getX(), (int)event.getY(), 1200);
    return false;
}

}
class AnimRender{
    public static native void setBitmap(Bitmap src);
    public static native void render(Bitmap dst);
    public static native void drop(int x, int y, int height);

static {
    System.loadLibrary("plasma");
}

}</pre>