Android仿腾讯QQ实现滑动删除 附源码下载

看了很多大神们的文章，感觉受益良多，也非常欣赏大家的分享态度，所以决定开始写Blog，给大家分享自己的心得。

先看看效果图：

本来准备在ListView的每个Item的布局上设置一个隐藏的Button，当滑动的时候显示。但是因为每次只要存在一个Button，发现每个Item上的Button相互间不好控制。所以决定继承ListView然后结合PopupWindow。

首先是布局文件：

delete_btn.xml：这里只需要一个Button

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:Android="Http://schemas.android.com/apk/res/android"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:orientation="vertical" >
  <Button 
  android:id="@+id/id_item_btn"
  android:layout_width="60dp"
  android:singleLine="true"
  android:layout_height="wrap_content"
  android:text="删除"
  android:background="@drawable/d_delete_btn"
  android:textColor="#ffffff"
  android:paddingLeft="15dp"
  android:paddingRight="15dp"
  android:layout_alignParentRight="true"
  android:layout_centerVertical="true"
  android:layout_marginRight="15dp"
  />
</LinearLayout> 

主布局文件：activity_main.xml，ListView的每个Item的样式直接使用了系统的android.R.layout.simple_list_item_1

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent" >
 <com.example.listviewitemslidedeletebtnshow.QQListView
  android:id="@+id/id_listview"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content" >
 </com.example.listviewitemslidedeletebtnshow.QQListView>
</RelativeLayout>

接下来看看QQListView的实现：

package com.example.listviewitemslidedeletebtnshow;
import android.content.Context;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.PopupWindow;
public class QQListView extends ListView
{
 private static final String TAG = "QQlistView";
 // private static final int VELOCITY_SANP = 200;
 // private VelocityTracker mVelocityTracker;
 
 private int touchSlop;
 
 private boolean isSliding;
 
 private int xDown;
 
 private int yDown;
 
 private int xMove;
 
 private int yMove;
 private LayoutInflater mInflater;
 private PopupWindow mPopupWindow;
 private int mPopupWindowHeight;
 private int mPopupWindowWidth;
 private Button mDelBtn;
 
 private DelButtonClickListener mListener;
 
 private View mCurrentView;
 
 private int mCurrentViewPos;
 
 public QQListView(Context context, AttributeSet attrs)
 {
 super(context, attrs);
 mInflater = LayoutInflater.from(context);
 touchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
 View view = mInflater.inflate(R.layout.delete_btn, null);
 mDelBtn = (Button) view.findViewById(R.id.id_item_btn);
 mPopupWindow = new PopupWindow(view, LinearLayout.LayoutParams.WRAP_CONTENT,
 LinearLayout.LayoutParams.WRAP_CONTENT);
 
 mPopupWindow.getContentView().measure(0, 0);
 mPopupWindowHeight = mPopupWindow.getContentView().getMeasuredHeight();
 mPopupWindowWidth = mPopupWindow.getContentView().getMeasuredWidth();
 }
 @Override
 public boolean dispatchTouchEvent(MotionEvent ev)
 {
 int action = ev.getAction();
 int x = (int) ev.getX();
 int y = (int) ev.getY();
 switch (action)
 {
 case MotionEvent.ACTION_DOWN:
 xDown = x;
 yDown = y;
 
 if (mPopupWindow.isshowing())
 {
 dismissPopWindow();
 return false;
 }
 // 获得当前手指按下时的item的位置
 mCurrentViewPos = pointToPosition(xDown, yDown);
 // 获得当前手指按下时的item
 View view = getChildAt(mCurrentViewPos - getFirstVisiblePosition());
 mCurrentView = view;
 break;
 case MotionEvent.ACTION_MOVE:
 xMove = x;
 yMove = y;
 int dx = xMove - xDown;
 int dy = yMove - yDown;
 
 if (xMove < xDown && Math.abs(dx) > touchSlop && Math.abs(dy) < touchSlop)
 {
 // Log.e(TAG, "touchslop = " + touchSlop + " , dx = " + dx +
 // " , dy = " + dy);
 isSliding = true;
 }
 break;
 }
 return super.dispatchTouchEvent(ev);
 }
 @Override
 public boolean onTouchEvent(MotionEvent ev)
 {
 int action = ev.getAction();
 
 if (isSliding)
 {
 switch (action)
 {
 case MotionEvent.ACTION_MOVE:
 int[] location = new int[2];
 // 获得当前item的位置x与y
 mCurrentView.getLocationOnScreen(location);
 // 设置popupWindow的动画
 mPopupWindow.setAnimationStyle(R.style.popwindow_delete_btn_anim_style);
 mPopupWindow.update();
 mPopupWindow.showAtLocation(mCurrentView, Gravity.LEFT | Gravity.TOP,
  location[0] + mCurrentView.getWidth(), location[1] + mCurrentView.getHeight() / 2
  - mPopupWindowHeight / 2);
 // 设置删除按钮的回调
 mDelBtn.setOnClickListener(new OnClickListener()
 {
  @Override
  public void onClick(View v)
  {
  if (mListener != null)
  {
  mListener.clickHappend(mCurrentViewPos);
  mPopupWindow.dismiss();
  }
  }
 });
 // Log.e(TAG, "mPopupWindow.getHeight()=" + mPopupWindowHeight);
 break;
 case MotionEvent.ACTION_UP:
 isSliding = false;
 }
 // 相应滑动期间屏幕itemClick事件，避免发生冲突
 return true;
 }
 return super.onTouchEvent(ev);
 }
 
 private void dismissPopWindow()
 {
 if (mPopupWindow != null && mPopupWindow.isShowing())
 {
 mPopupWindow.dismiss();
 }
 }
 public void setDelButtonClickListener(DelButtonClickListener listener)
 {
 mListener = listener;
 }
 interface DelButtonClickListener
 {
 public void clickHappend(int position);
 }
}

代码注释写得很详细，简单说一下，在dispatchTouchEvent中设置当前是否响应用户滑动，然后在onTouchEvent中判断是否响应，如果响应则popupWindow以动画的形式展示出来。当然屏幕上如果存在PopupWindow则屏幕ListView的滚动与Item的点击，以及从右到左滑动时屏幕Item的click事件。

接下来是MainActivity.java，这里代码很简单不做介绍了。

package com.example.listviewitemslidedeletebtnshow;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Toast;
import com.example.listviewitemslidedeletebtnshow.QQListView.DelButtonClickListener;
public class MainActivity extends Activity
{
 private QQListView mListView;
 private ArrayAdapter<String> mAdapter;
 private List<String> mDatas;
 @Override
 protected void onCreate(Bundle savedInstanceState)
 {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 mListView = (QQListView) findViewById(R.id.id_listview);
 // 不要直接Arrays.asList
 mDatas = new ArrayList<String>(Arrays.asList("HelloWorld", "Welcome", "Java", "Android", "Servlet", "Struts",
 "Hibernate", "spring", "HTML5", "javascript", "Lucene"));
 mAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, mDatas);
 mListView.setAdapter(mAdapter);
 mListView.setDelButtonClickListener(new DelButtonClickListener()
 {
 @Override
 public void clickHappend(final int position)
 {
 Toast.makeText(MainActivity.this, position + " : " + mAdapter.getItem(position), 1).show();
 mAdapter.remove(mAdapter.getItem(position));
 }
 });
 mListView.setOnItemClickListener(new OnItemClickListener()
 {
 @Override
 public void onItemClick(AdapterView<?> parent, View view, int position, long id)
 {
 Toast.makeText(MainActivity.this, position + " : " + mAdapter.getItem(position), 1).show();
 }
 });
 }
}

楼主使用asm.jar以及gifcamera截的gif，由于button的动画很短感觉截图效果很卡不流畅，大家有什么好的截图，还望推荐。

有兴趣的还是下载源码看看效果，源码下载

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