Android SurfaceView 触屏贴图

最新推荐文章于 2025-12-03 23:19:21 发布

最新推荐文章于 2025-12-03 23:19:21 发布 · 115 阅读

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#移动开发

本文介绍了一个使用Android SurfaceView进行自定义绘图的简单示例。该示例展示了如何通过监听触摸事件来更新图片位置，并在SurfaceView上绘制一张图片。代码实现了基本的触摸响应和图像绘制功能。

package xitong.co.cc;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.PixelFormat;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class MySurfaceView extends
SurfaceView implements
SurfaceHolder.Callback {

float left;
float top;
Bitmap bitmap = BitmapFactory
.decodeResource(
getContext()
.getResources(),
R.drawable.cracok);

public MySurfaceView(Context context) {
super(context);
// TODO Auto-generated constructor stub

getHolder()
.setFormat(
PixelFormat.TRANSPARENT);
getHolder().addCallback(this);

setFocusable(false);
}

@Override
public boolean onTouchEvent(
MotionEvent event) {
// TODO Auto-generated method stub
left = event.getX();
top = event.getY();
doDraw();

return super
.onTouchEvent(event);

}

private void doDraw() {
// TODO Auto-generated method stub

Canvas canvas = getHolder()
.lockCanvas();
canvas.drawBitmap(bitmap, left,
top, null);
getHolder()
.unlockCanvasAndPost(
canvas);

}

@Override
public void surfaceChanged(
SurfaceHolder holder,
int format, int width,
int height) {
// TODO Auto-generated method stub

}

@Override
public void surfaceCreated(
SurfaceHolder holder) {
// TODO Auto-generated method stub

doDraw();

}

@Override
public void surfaceDestroyed(
SurfaceHolder holder) {
// TODO Auto-generated method stub

}
}