通過繼承ListView然后結合PopupWindow實現

首先是布局文件：
delete_btn.xml：這里只需要一個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="刪除" 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的每個Item的樣式直接使用了系統的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>

接下來看看QQListView的實現：

package com.example.listviewitemslidedeletebtnshow;import android.content.Context; import android.util.AttributeSet; import android.util.Log; 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;/*** 用戶滑動的最小距離*/private int touchSlop;/*** 是否響應滑動*/private boolean isSliding;/*** 手指按下時的x坐標*/private int xDown;/*** 手指按下時的y坐標*/private int yDown;/*** 手指移動時的x坐標*/private int xMove;/*** 手指移動時的y坐標*/private int yMove;private LayoutInflater mInflater;private PopupWindow mPopupWindow;private int mPopupWindowHeight;private int mPopupWindowWidth;private Button mDelBtn;/*** 為刪除按鈕提供一個回調接口*/private DelButtonClickListener mListener;/*** 當前手指觸摸的View*/private View mCurrentView;/*** 當前手指觸摸的位置*/private int mCurrentViewPos;/*** 必要的一些初始化* * @param context* @param attrs*/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);/*** 先調用下measure,否則拿不到寬和高*/mPopupWindow.getContentView().measure(0, 0);mPopupWindowHeight = mPopupWindow.getContentView().getMeasuredHeight();mPopupWindowWidth = mPopupWindow.getContentView().getMeasuredWidth();}@Overridepublic 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;/*** 如果當前popupWindow顯示，則直接隱藏，然后屏蔽ListView的touch事件的下傳*/if (mPopupWindow.isShowing()){dismissPopWindow();return false;}// 獲得當前手指按下時的item的位置mCurrentViewPos = pointToPosition(xDown, yDown);// 獲得當前手指按下時的itemView view = getChildAt(mCurrentViewPos - getFirstVisiblePosition());mCurrentView = view;break;case MotionEvent.ACTION_MOVE:xMove = x;yMove = y;int dx = xMove - xDown;int dy = yMove - yDown;/*** 判斷是否是從右到左的滑動*/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);}@Overridepublic boolean onTouchEvent(MotionEvent ev){int action = ev.getAction();/*** 如果是從右到左的滑動才相應*/if (isSliding){switch (action){case MotionEvent.ACTION_MOVE:int[] location = new int[2];// 獲得當前item的位置x與ymCurrentView.getLocationOnScreen(location);// 設置popupWindow的動畫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);Log.i("test", "location="+location[0]+","+location[1]);// 設置刪除按鈕的回調mDelBtn.setOnClickListener(new OnClickListener(){@Overridepublic 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;}// 相應滑動期間屏幕itemClick事件，避免發生沖突return true;}return super.onTouchEvent(ev);}/*** 隱藏popupWindow*/private void dismissPopWindow(){if (mPopupWindow != null && mPopupWindow.isShowing()){mPopupWindow.dismiss();}}public void setDelButtonClickListener(DelButtonClickListener listener){mListener = listener;}interface DelButtonClickListener{public void clickHappend(int position);}}

代碼注釋寫得很詳細，簡單說一下，在dispatchTouchEvent中設置當前是否響應用戶滑動，然后在onTouchEvent中判斷是否響應，如果響應則popupWindow以動畫的形式展示出來。當然屏幕上如果存在PopupWindow則屏幕ListView的滾動與Item的點擊，以及從右到左滑動時屏幕Item的click事件。

點擊時記錄下當前的位置，再判斷是否右滑，如果右滑則出現popupWindow,根據按下時記錄下的位置判斷出popuwindow出現的位置。

MainActivity.java

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;@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mListView = (QQListView) findViewById(R.id.id_listview);// 不要直接Arrays.asListmDatas = 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(){@Overridepublic void clickHappend(final int position){Toast.makeText(MainActivity.this, position + " : " + mAdapter.getItem(position), 1).show();mAdapter.remove(mAdapter.getItem(position));}});mListView.setOnItemClickListener(new OnItemClickListener(){@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position, long id){Toast.makeText(MainActivity.this, position + " : " + mAdapter.getItem(position), 1).show();}});} }

注意，這里使用了一種設計方法

在QQListView中定義了接口

public void setDelButtonClickListener(DelButtonClickListener listener){mListener = listener;}interface DelButtonClickListener{public void clickHappend(int position);}

在MainActivity中實例化，然后listView中會調用

mListView.setDelButtonClickListener(new DelButtonClickListener(){@Overridepublic void clickHappend(final int position){Toast.makeText(MainActivity.this, position + " : " + mAdapter.getItem(position), 1).show();mAdapter.remove(mAdapter.getItem(position));}});

實例化的clickHappend方法。

參考資料

ListView滑動刪除 ，仿騰訊QQ - Hongyang - 博客頻道 - CSDN.NET

Android PopupWindow的使用和分析 - 圣騎士wind - 博客園

PopUpWindow使用詳解(一)——基本使用 - 啟艦 - 博客頻道 - CSDN.NET

完成

總結

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