java – Activity在旋转后泄露了PopupWindow窗口

那是我的PopupMenu：

private void showSelectionMenu(View caller) {
    popup = new PopupMenu(this,caller);
//  popup.getMenuInflater().inflate(R.menu.selection_menu,popup.getMenu());
    popup.inflate(R.menu.selection_menu);
    popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
        public boolean onMenuItemClick(MenuItem item) {
            Toast.makeText(FileListActivity.this,getString(R.string.selecting)+" "+item.getTitle(),Toast.LENGTH_SHORT).show();
            switch (item.getItemId()) {
                case R.id.select_all:                   mediaFolder.selectAll(); break;
                case R.id.select_none:                  mediaFolder.selectNone(); break;
                case R.id.select_videos:                mediaFolder.selectVideos(); break;
                case R.id.select_pictures:              mediaFolder.selectImages(); break;
                default:                                break;
            }
            findViewById(R.id.buttonRenameSelected).setEnabled(mediaFolder.numberSelected>0);
            cla.redraw();
            return true;
        }
    });
    if (Build.VERSION.SDK_INT >= 14) {
        popup.setOnDismissListener(new PopupMenu.OnDismissListener() {
            @Override
            public void onDismiss(PopupMenu menu) {
                Log.d(TAG,"selectionMenu dismissed");
            }
        });
    }
    popup.show();
}

我知道这里的许多程序员之前都有同样的错误,通常他们被告知要解除onDestroy()中的菜单.我也是：

@Override
public void onDestroy() {
    super.onDestroy();
    Log.d(TAG,"FileListActivity onDestroy()");
    Log.d(TAG,"onDestroy: popup==null? "+(popup==null));
    if (popup != null) { popup.dismiss(); popup = null; }
    Log.d(TAG,"onDestroy: popup==null? "+(popup==null));

    dataFragment.mRetainedCache = mMemoryCache;
    dataFragment.setData(mediaFolder);
}

这就是生成的日志,包括错误：

02-10 22:24:15.969 D: FileListActivity onDestroy()
02-10 22:24:15.969 D: onDestroy: popup==null? false
02-10 22:24:15.971 D: selectionMenu dismissed
02-10 22:24:15.971 D: onDestroy: popup==null? true
02-10 22:24:16.064 E: android.view.WindowLeaked: Activity com.myApp.FileListActivity has leaked window android.widget.PopupWindow$PopupDecorView{365b288 V.E...... ......ID 0,0-822,1152} that was originally added here
    at android.view.ViewRootImpl.<init>(ViewRootImpl.java:418)
    at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:331)
    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:94)
    at android.widget.PopupWindow.invokePopup(PopupWindow.java:1378)
    at android.widget.PopupWindow.showAsDropDown(PopupWindow.java:1234)
    at android.support.v7.widget.AppCompatPopupWindow.showAsDropDown(AppCompatPopupWindow.java:78)
    at android.support.v4.widget.PopupWindowCompatKitKat.showAsDropDown(PopupWindowCompatKitKat.java:30)
    at android.support.v4.widget.PopupWindowCompat$KitKatPopupWindowImpl.showAsDropDown(PopupWindowCompat.java:92)
    at android.support.v4.widget.PopupWindowCompat.showAsDropDown(PopupWindowCompat.java:171)
    at android.support.v7.widget.ListPopupWindow.show(ListPopupWindow.java:680)
    at android.support.v7.view.menu.MenuPopupHelper.tryShow(MenuPopupHelper.java:163)
    at android.support.v7.view.menu.MenuPopupHelper.show(MenuPopupHelper.java:129)
    at android.support.v7.widget.PopupMenu.show(PopupMenu.java:216)
    at com.myApp.FileListActivity.showSelectionMenu(FileListActivity.java:434)
    at com.myApp.FileListActivity.access$100(FileListActivity.java:44)
    at com.myApp.FileListActivity$5.onClick(FileListActivity.java:186)
    at android.view.View.performClick(View.java:5637)
    at android.view.View$PerformClick.run(View.java:22433)
    at android.os.Handler.handleCallback(Handler.java:751)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:154)
    at android.app.ActivityThread.main(ActivityThread.java:6126)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
02-10 22:24:16.079 D: FileListActivity onCreate()

正如您在日志中看到的那样,PopupMenu(弹出窗口)被取消,并在发生错误之前设置为null.

知道出了什么问题吗？

编辑：

这就是调用showSelectionMenu(View调用者)的地方(在onCreate中)：

Button buttonSelectFiles = (Button) findViewById(R.id.buttonSelectFiles);
buttonSelectFiles.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        showSelectionMenu(v);
    }
});

编辑2：

我刚刚发现我在运行Android 7.1.1(LineageOS,每晚构建)的Nexus 5上出现了这个错误,但在运行Fire OS 5.3.2.1(基于Android 5)的Fire HD 8上却没有,而不是在三星Galaxy上S运行Android 4.4.4(CyanogenMod 11).所以也许它只发生在Android 7上,或者LineageOS中有一个错误！？
如果有人拥有官方Android 7,他/她可能会尝试使用此Android Popup Menu Example来激发该错误.您只需要添加以下代码：

@Override
public void onDestroy() {
    super.onDestroy();
    if (popup != null) { popup.dismiss(); popup = null; }
}

并使popup成为一个类成员变量.

编辑3：

这不是LineageOS问题.运行Android 7.1.1的Android Studio模拟器中也会出现此错误.