需求：
1、listView可以側滑item，展示刪除按鈕，點擊刪除按鈕，刪除當前的item
2、在刪除按鈕展示時，點擊隱藏刪除按鈕，不響應item的點擊事件
3、在刪除按鈕隱藏時，點擊item響應點擊事件
根據以上需求在網絡上查找響應的例子，也有仿QQ側滑代碼，但不能滿足2和3的要求，因此修改了一把，代碼如下，共大家拍磚
第一步：重寫ListView
public class SwipeListView extends ListView { private final static String TAG = "SwipeListView"; private int mScreenWidth; // 屏幕寬度 private int mDownX; // 按下點的x值 private int mDownY; // 按下點的y值 private int mDeleteBtnWidth;// 刪除按鈕的寬度 private boolean isDeleteShown = false; // 刪除按鈕是否正在顯示 private boolean isOnClick = false; private ViewGroup mPointChild; // 當前處理的item private LinearLayout.LayoutParams mLayoutParams; // 當前處理的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); // 獲取屏幕寬度 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); } // 處理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(); // 獲取當前點的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); // 獲取刪除按鈕的寬度 mDeleteBtnWidth = mPointChild.getChildAt(1).getLayoutParams().width; mLayoutParams = (LinearLayout.LayoutParams) mPointChild.getChildAt(0) .getLayoutParams(); // 爲什麼要重新設置layout_width 等於屏幕寬度 // 因爲match_parent時，不管你怎麼滑，都不會顯示刪除按鈕 // why？ 因爲match_parent時，ViewGroup就不去佈局剩下的view mLayoutParams.width = mScreenWidth; mPointChild.getChildAt(0).setLayoutParams(mLayoutParams); } // 處理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)) { // 如果向左滑動 if (nowX < mDownX) { // 計算要偏移的距離 int scroll = (nowX - mDownX) / 2; // 如果大於了刪除按鈕的寬度， 則最大爲刪除按鈕的寬度 if (-scroll >= mDeleteBtnWidth) { scroll = -mDeleteBtnWidth; } // 重新設置leftMargin mLayoutParams.leftMargin = scroll; mPointChild.getChildAt(0).setLayoutParams(mLayoutParams); } return true; } return super.onTouchEvent(ev); } // 處理action_up事件 private boolean performActionUp(MotionEvent ev) { boolean falg = false; if(isOnClick && !isDeleteShown) { falg = true; } // 偏移量大於button的一半，則顯示button // 否則恢復默認 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; } /** * 變爲正常狀態 */ public void turnToNormal() { mLayoutParams.leftMargin = 0; mPointChild.getChildAt(0).setLayoutParams(mLayoutParams); } /** * 當前是否可點擊 * * @return 是否可點擊 */ public boolean canClick() { return !isDeleteShown; } }
第二步：適配器
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; }
第三步：寫一個TestListViewActivity
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) + "被點擊了", // 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) + "被點擊了", // Toast.LENGTH_SHORT).show(); } }); }
第四步：佈局文件
<?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>
第五步：item的佈局文件
<?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="刪除" android:textColor="@android:color/white" /> </LinearLayout>
重點注意：
int downPosition = pointToPosition(mDownX, mDownY);
downPosition 在使用過程中得到-1，導致後面方法調用異常！
以上如有問題請留言，謝謝！