Android 模仿QQ侧滑删除ListView功能示例

public class SwipeListView extends ListView {  private final static String TAG = "SwipeListView";  private int mScreenWidth;  // 屏幕宽度  private int mDownX;      // 按下点的x值  private int mDownY;      // 按下点的y值  private int mDeleteBtnWidth;// 删除按钮的宽度  private boolean isDeleteShown = false;  // 删除按钮是否正在显示  private boolean isOnClick = false;  private ViewGroup mPointChild;  // 当前处理的item  private LinearLayout.LayoutParams mLayoutParams;  // 当前处理的item的LayoutParams  public SwipeListView(Context context, AttributeSet attrs) {    this(context, attrs, 0);  }  public SwipeListView(Context context, AttributeSet attrs, int defStyle) {    super(context, attrs, defStyle);    // 获取屏幕宽度    WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);    DisplayMetrics dm = new DisplayMetrics();    wm.getDefaultDisplay().getMetrics(dm);    mScreenWidth = dm.widthPixels;  }  @Override  public boolean onTouchEvent(MotionEvent ev) {    switch (ev.getAction()) {      case MotionEvent.ACTION_DOWN:        performActionDown(ev);        break;      case MotionEvent.ACTION_MOVE:        return performActionMove(ev);      case MotionEvent.ACTION_UP:        return performActionUp(ev);//        break;    }    return super.onTouchEvent(ev);  }  // 处理action_down事件  private void performActionDown(MotionEvent ev) {//    Log.e(TAG,"performActionDown===="+isDeleteShown);    if (isDeleteShown) {      turnToNormal();    }    isOnClick = true;    mDownX = (int) ev.getX();    mDownY = (int) ev.getY();    // 获取当前点的item    int downPosition = pointToPosition(mDownX, mDownY);    int firstPosition= getFirstVisiblePosition();    Log.e(TAG,"performActionDown====downPosition:"+downPosition+"==firstPosition"+firstPosition);    if(downPosition < 0) return;    mPointChild = (ViewGroup) getChildAt(downPosition-firstPosition);    // 获取删除按钮的宽度    mDeleteBtnWidth = mPointChild.getChildAt(1).getLayoutParams().width;    mLayoutParams = (LinearLayout.LayoutParams) mPointChild.getChildAt(0)        .getLayoutParams();    // 为什么要重新设置layout_width 等于屏幕宽度    // 因为match_parent时，不管你怎么滑，都不会显示删除按钮    // why？ 因为match_parent时，ViewGroup就不去布局剩下的view    mLayoutParams.width = mScreenWidth;    mPointChild.getChildAt(0).setLayoutParams(mLayoutParams);  }  // 处理action_move事件  private boolean performActionMove(MotionEvent ev) {//    Log.e(TAG, "performActionMove====" + isDeleteShown);    int nowX = (int) ev.getX();    int nowY = (int) ev.getY();    isOnClick = false;    if (Math.abs(nowX - mDownX) > Math.abs(nowY - mDownY)) {      // 如果向左滑动      if (nowX < mDownX) {        // 计算要偏移的距离        int scroll = (nowX - mDownX) / 2;        // 如果大于了删除按钮的宽度， 则最大为删除按钮的宽度        if (-scroll >= mDeleteBtnWidth) {          scroll = -mDeleteBtnWidth;        }        // 重新设置leftMargin        mLayoutParams.leftMargin = scroll;        mPointChild.getChildAt(0).setLayoutParams(mLayoutParams);      }      return true;    }    return super.onTouchEvent(ev);  }  // 处理action_up事件  private boolean performActionUp(MotionEvent ev) {    boolean falg = false;    if(isOnClick && !isDeleteShown)    {      falg = true;    }    // 偏移量大于button的一半，则显示button    // 否则恢复默认    if (-mLayoutParams.leftMargin >= mDeleteBtnWidth / 2) {      mLayoutParams.leftMargin = -mDeleteBtnWidth;      isDeleteShown = true;    } else {      turnToNormal();      isDeleteShown = false;    }    mPointChild.getChildAt(0).setLayoutParams(mLayoutParams);//    Log.e(TAG, "performActionUp====" + isDeleteShown);    if(falg)    {      return super.onTouchEvent(ev);    }    return true;  }  /**   * 变为正常状态   */  public void turnToNormal() {    mLayoutParams.leftMargin = 0;    mPointChild.getChildAt(0).setLayoutParams(mLayoutParams);  }  /**   * 当前是否可点击   *   * @return 是否可点击   */  public boolean canClick() {    return !isDeleteShown;  }}

class SwipeListAdapter extends BaseAdapter {  @Override  public int getCount() {    return mData.size();  }  @Override  public Object getItem(int position) {    return mData.get(position);  }  @Override  public long getItemId(int position) {    return position;  }  @Override  public View getView(int position, View convertView, ViewGroup parent) {    ViewHolder holder = null;    if (null == convertView) {      holder = new ViewHolder();      convertView = View.inflate(TestListViewActivity.this, R.layout.item_swipe_list, null);      holder.tv = (LinearLayout) convertView.findViewById(R.id.tv);      holder.tvName = (TextView) convertView.findViewById(R.id.tv_name);      holder.delete = (TextView) convertView.findViewById(R.id.delete);      convertView.setTag(holder);    }    else {      holder = (ViewHolder) convertView.getTag();    }    holder.tvName.setText(mData.get(position));    final int pos = position;    holder.delete.setOnClickListener(new View.OnClickListener() {      @Override      public void onClick(View v) {        mData.remove(pos);        notifyDataSetChanged();        mListView.turnToNormal();      }    });    return convertView;  }}static class ViewHolder {  LinearLayout tv;  TextView tvName;  TextView delete;}

private SwipeListView mListView;  private ArrayList<String> mData = new ArrayList<String>() {    {      for (int i = 0; i < 20; i++) {        add("hello world, hello android " + i);      }    }  };  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_test_list_view);    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);    setSupportActionBar(toolbar);    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);    fab.setOnClickListener(new View.OnClickListener() {      @Override      public void onClick(View view) {        Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)            .setAction("Action", null).show();      }    });    mListView = (SwipeListView) findViewById(R.id.list);    mListView.setAdapter(new SwipeListAdapter());//    mListView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {//      @Override//      public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {//        Toast.makeText(TestListViewActivity.this, mData.get(position) + "被点击了",//            Toast.LENGTH_SHORT).show();//        return false;//      }//    });    mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {      @Override      public void onItemClick(AdapterView<?> parent, View view, int position, long id) {        Log.e("SwipeListView", "setOnItemClickListener====" + mListView.canClick());//        Toast.makeText(TestListViewActivity.this, mData.get(position) + "被点击了",//            Toast.LENGTH_SHORT).show();      }    });  }

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:tools="http://schemas.android.com/tools"  xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent"  android:layout_height="match_parent"   app:layout_behavior="@string/appbar_scrolling_view_behavior"  tools:showIn="@layout/activity_test_list_view"  tools:context="com.kimascend.ledappd1.activity.TestListViewActivity">  <com.kimascend.ledappd1.view.SwipeListView    android:id="@+id/list"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:cacheColorHint="@android:color/transparent"    android:listSelector="@android:color/transparent"    android:divider="@android:color/darker_gray"    android:dividerHeight="2dp">  </com.kimascend.ledappd1.view.SwipeListView></RelativeLayout>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:orientation="horizontal">  <LinearLayout    android:id="@+id/tv"    android:orientation="horizontal"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:background="@android:color/white"    android:paddingBottom="20dp"    android:paddingLeft="10dp"    android:paddingTop="20dp">    <ImageView      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:background="@drawable/group_name_rgb"      android:id="@+id/imageView8" />    <TextView      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:textAppearance="?android:attr/textAppearanceLarge"      android:text="Large Text"      android:layout_gravity="center_vertical"      android:id="@+id/tv_name" />  </LinearLayout>  <TextView    android:id="@+id/delete"    android:layout_width="80dp"    android:layout_height="match_parent"    android:background="#FFFF0000"    android:gravity="center"    android:paddingLeft="20dp"    android:paddingRight="20dp"    android:text="删除"    android:textColor="@android:color/white" /></LinearLayout>

int downPosition = pointToPosition(mDownX, mDownY);