自定义View---跟随手指的小兔子

兔子会跟随手指移动

image.png

image.png

xml

主函数

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        FrameLayout frameLayout =(FrameLayout)findViewById(R.id.mylayout);

        final RabbitView rabbit=new RabbitView(this);
        rabbit.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent motionEvent) {
                rabbit.bitmapX=motionEvent.getX();
                rabbit.bitmapY=motionEvent.getY();
                rabbit.invalidate();
                return true;
            }
        });
        frameLayout.addView(rabbit);
    }
}

RabbitView

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.view.View;

public class RabbitView extends View {
    public float bitmapX;
    public float bitmapY;
    public RabbitView(Context context) {
        super(context);
        bitmapX=290;
        bitmapY=130;

    }
    protected void onDraw(Canvas canvas){
        super.onDraw(canvas);
        Paint paint = new Paint();
        Bitmap bitmap = BitmapFactory.decodeResource(this.getResources(),R.mipmap.rabbit);
        canvas.drawBitmap(bitmap,bitmapX,bitmapY,paint);
        if(bitmap.isRecycled()){
            bitmap.recycle();
        }
    }
}