点击button拖动效果

edison_cool911

这个简单的代码段可以熟悉getX(),getRawX()等方法,实现按钮的拖动效果:
package com.example;import android.app.Activity;import android.os.Bundle;import android.widget.Button;import android.view.MotionEvent;import android.view.View;import android.view.View.OnTouchListener;public class ButtonDrag extends Activity {/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);final Button btn = (Button) findViewById(R.id.btn_hello);btn.setOnTouchListener(new OnTouchListener() {int[] temp = new int[] { 0, 0 };public boolean onTouch(View v, MotionEvent event) {int eventaction = event.getAction();int x = (int) event.getRawX();int y = (int) event.getRawY();switch (eventaction) {case MotionEvent.ACTION_DOWN:temp[0] = (int) event.getX();temp[1] = (int) event.getY();break;case MotionEvent.ACTION_MOVE:v.layout(x - temp[0], y - temp[1], x + v.getWidth()- temp[0], y + v.getHeight() - temp[1]);// run in non_UI threadv.postInvalidate();break;case MotionEvent.ACTION_UP:break;}return false;}});}}