Android应用小实例--跟随手指的小球 .

package com.jiahui.draw; import android.app.Activity; import android.os.Bundle; import android.os.SystemClock; import android.view.MotionEvent; import android.view.View; import android.widget.LinearLayout; public class CustomeViewActivity extends Activity { public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); LinearLayout root=(LinearLayout) findViewById(R.id.root); //创建一个自己继承于View的对象 final DrawView drawView=new DrawView(this); //设置自定义组件的最大宽度和高度 drawView.setMinimumWidth(300); drawView.setMinimumHeight(500); drawView.setOnTouchListener(new View.OnTouchListener() { public boolean onTouch(View v, MotionEvent event) { drawView.currentX=event.getX(); drawView.currentY=event.getY(); //重绘 drawView.invalidate(); //返回true表明算是方法已经处理该事件 return true; } }); root.addView(drawView); } }