Android 拖拽效果实现代码分享

复制代码 package com.roiding.sample;               import android.app.Activity;               import android.os.Bundle;               import android.util.Log;               import android.view.MotionEvent;               import android.view.View;               import android.view.View.OnTouchListener;               import android.widget.Button;               public class Touch extends Activity {               /** Called when the activity is first created. */               @Override               public 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();               Log.i("&&&", "onTouchEvent:" + eventaction);               int x = (int) event.getRawX();               int y = (int) event.getRawY();               switch (eventaction) {               case MotionEvent.ACTION_DOWN: // touch down so check if the               temp[0] = (int) event.getX();               temp[1] = y - v.getTop();               break;               case MotionEvent.ACTION_MOVE: // touch drag with the ball               v.layout(x - temp[0], y - temp[1], x + v.getWidth()               - temp[0], y - temp[1] + v.getHeight());               v.postInvalidate();               break;               case MotionEvent.ACTION_UP:               break;               }               return false;               }               });               }               }

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