Android跟随手指运动的小球 …

16lz 2021-01-26

[java] view plain copy

package yuhee.mars;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.View;
public class DrawView extends View{
public float currentx = 40 ;
public float currenty = 50 ;
public DrawView(Context context) {
super(context);
// TODO Auto-generated constructor stub
}
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
//创建画笔 ;
Paint p = new Paint() ;
p.setColor(Color.GREEN) ;
//绘制一个小球；
canvas.drawCircle(currentx, currenty, 15, p) ;
}
}

下面是该应用的Activity类：

[java] view plain copy

package yuhee.mars;
import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.LinearLayout;
public class Activity_06Activity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
LinearLayout main = (LinearLayout)findViewById(R.id.root) ;
final DrawView draw = new DrawView(this) ;
draw.setMinimumWidth(300) ;
draw.setMinimumHeight(500) ;
draw.setOnTouchListener(new OnTouchListener()
{
@Override
public boolean onTouch(View arg0, MotionEvent event) {
// TODO Auto-generated method stub
draw.currentx = event.getX() ;
draw.currenty = event.getY() ;
//通知Draw组件重绘 ;
draw.invalidate() ;
return true ;
}
}) ;
main.addView(draw) ;
}
}

看下效果图：欢迎各位拍砖

适合新手的很好的Demo" width="0" height="0">

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