View实现事件监听DEMO（文本跟随触屏事件）

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;

public class MView extends View {
    private int x = 20;
    private int y = 20;
    
    public MView(Context context){
        super(context);
        setFocusable(true);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        // TODO Auto-generated method stub
        super.onDraw(canvas);
        Paint paint = new Paint();
        paint.setColor(Color.BLUE);
        canvas.drawColor(Color.BLACK);
        canvas.drawText("NEW GAME", x, y, paint);
        
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        // TODO Auto-generated method stub
        
        return super.onKeyDown(keyCode, event);
        
    }

    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event) {
        // TODO Auto-generated method stub
        return super.onKeyUp(keyCode, event);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        // TODO Auto-generated method stub
        x = (int)event.getX();
        y = (int)event.getY();
//        invalidate();
        postInvalidate();
        return true;
    }
    
}