無法顯示彈出式對話框

Question

我想從menuoptions中顯示popupdialogue對話框。代碼的存在 -

public void createNewList(){ 
     popupCreateList = new PopupWindow(popupCreateListView,LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT); 
     popupCreateList.setBackgroundDrawable(new BitmapDrawable()); 
     popupCreateList.setOutsideTouchable(true); 
     Log.i(TAG,"popUpListView-->>>" + popUpListView.getParent()); 
     //((ViewGroup)popUpListView.getParent()).removeView(popUpListView); <--Commented 

     popupCreateList.showAtLocation(findViewById(R.id.layoutTaskManagerID), Gravity.CENTER, 0, 0); <-- ERROR 
     //popupCreateList.showAsDropDown(listsButton, 50, -30); 

    } 

每當我嘗試運行它，它給了我下面的logcat錯誤 -

12-30 14:43:00.735: E/AndroidRuntime(1385): FATAL EXCEPTION: main 
12-30 14:43:00.735: E/AndroidRuntime(1385): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first. 
12-30 14:43:00.735: E/AndroidRuntime(1385):  at android.view.ViewGroup.addViewInner(ViewGroup.java:3378) 
12-30 14:43:00.735: E/AndroidRuntime(1385):  at android.view.ViewGroup.addView(ViewGroup.java:3249) 
12-30 14:43:00.735: E/AndroidRuntime(1385):  at android.view.ViewGroup.addView(ViewGroup.java:3225) 
12-30 14:43:00.735: E/AndroidRuntime(1385):  at android.widget.PopupWindow.preparePopup(PopupWindow.java:965) 
12-30 14:43:00.735: E/AndroidRuntime(1385):  at android.widget.PopupWindow.showAtLocation(PopupWindow.java:836) 
12-30 14:43:00.735: E/AndroidRuntime(1385):  at android.widget.PopupWindow.showAtLocation(PopupWindow.java:809) 
12-30 14:43:00.735: E/AndroidRuntime(1385):  at ray.kaushik.simple.task.manager.TaskManagerActivity.createNewList(TaskManagerActivity.java:340) 
12-30 14:43:00.735: E/AndroidRuntime(1385):  at ray.kaushik.simple.task.manager.TaskManagerActivity.onMenuItemSelected(TaskManagerActivity.java:324) 
12-30 14:43:00.735: E/AndroidRuntime(1385):  at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:958) 
12-30 14:43:00.735: E/AndroidRuntime(1385):  at com.android.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:735) 
12-30 14:43:00.735: E/AndroidRuntime(1385):  at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:149) 
12-30 14:43:00.735: E/AndroidRuntime(1385):  at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:874) 
12-30 14:43:00.735: E/AndroidRuntime(1385):  at com.android.internal.view.menu.IconMenuView.invokeItem(IconMenuView.java:468) 
12-30 14:43:00.735: E/AndroidRuntime(1385):  at com.android.internal.view.menu.IconMenuItemView.performClick(IconMenuItemView.java:126) 
12-30 14:43:00.735: E/AndroidRuntime(1385):  at android.view.View$PerformClick.run(View.java:16966) 
12-30 14:43:00.735: E/AndroidRuntime(1385):  at android.os.Handler.handleCallback(Handler.java:615) 
12-30 14:43:00.735: E/AndroidRuntime(1385):  at android.os.Handler.dispatchMessage(Handler.java:92) 
12-30 14:43:00.735: E/AndroidRuntime(1385):  at android.os.Looper.loop(Looper.java:137) 
12-30 14:43:00.735: E/AndroidRuntime(1385):  at android.app.ActivityThread.main(ActivityThread.java:4745) 
12-30 14:43:00.735: E/AndroidRuntime(1385):  at java.lang.reflect.Method.invokeNative(Native Method) 
12-30 14:43:00.735: E/AndroidRuntime(1385):  at java.lang.reflect.Method.invoke(Method.java:511) 
12-30 14:43:00.735: E/AndroidRuntime(1385):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
12-30 14:43:00.735: E/AndroidRuntime(1385):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
12-30 14:43:00.735: E/AndroidRuntime(1385):  at dalvik.system.NativeStart.main(Native Method) 

當我嘗試點擊第二次面對此錯誤。如果我取消註釋註釋行來刪除視圖仍然是相同的。可以dumone plz指導我與此原因。請詳細說明我新的android開發。任何想法相同。？感謝提前。

Ray

Answer 1

使用此工作示例代碼（我寫和測試它），並根據需要進行修改： 創建菜單\ my_options_menu.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"> 
<item android:id="@+id/popup1" 
android:title="popup1" /> 
</menu> 

創建佈局\ popup.xml

<?xml version="1.0" encoding="utf-8"?> 
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="vertical" 
    android:background="@android:color/background_light"> 
    <LinearLayout 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:orientation="vertical" 
    android:layout_margin="1dp" 
    android:background="@android:color/darker_gray"> 
    > 
    <LinearLayout 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:orientation="vertical" 
    android:layout_margin="20dp"> 
    <TextView 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:text="It's a PopupWindow" /> 
    <ImageView 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:src="@drawable/ic_launcher" /> 
    <Button 
     android:id="@+id/dismiss" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:text="Dismiss" /> 
    </LinearLayout> 
</LinearLayout> 
</LinearLayout> 

在你的主要活動添加以下內容：

public boolean onCreateOptionsMenu(Menu menu) { 
    MenuInflater inflater = getMenuInflater(); 
    inflater.inflate(R.menu.my_options_menu, menu); 
    return true; 
} 

public boolean onOptionsItemSelected(MenuItem item) { 
    switch (item.getItemId()) { 
    case R.id.popup1: 
     if (popupCreateList!=null) return true; 
     LayoutInflater layoutInflater = (LayoutInflater)getBaseContext().getSystemService(LAYOUT_INFLATER_SERVICE); 
     View popupView = layoutInflater.inflate(R.layout.popup, null); 
     popupCreateList = new PopupWindow(popupView,LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT); 
     popupCreateList.setBackgroundDrawable(new BitmapDrawable()); 
     popupCreateList.setOutsideTouchable(true); 
     popupCreateList.showAtLocation((RelativeLayout)findViewById(R.id.main_activity_layout), Gravity.CENTER, 0, 0); 
     Button btnDismiss = (Button)popupView.findViewById(R.id.dismiss); 
     btnDismiss.setOnClickListener(new Button.OnClickListener(){ 

      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 
       popupCreateList.dismiss(); 
       popupCreateList=null; 
      }}); 

     return true; 
    default: 
    return super.onOptionsItemSelected(item); 
    } 
} 

更多：我建議你u到爲了閱讀這些文章，激勵你：

http://android-er.blogspot.it/2012/03/example-of-using-popupwindow.html

http://android-ed.blogspot.it/2011/08/using-popupwindow-in-android.html

PopupWindow in android

Answer 2

是否有一個特定的原因，你這樣做而不是使用Alert？警報是一個彈出對話框（你可以有多個按鈕）。另一種方法（如果Alert不夠）是創建一個具有Alert主題（在清單中設置）的整個活動，然後您可以調用startActivity()，它看起來像一個警報，即使它是一個完整的功能活動將位於活動堆棧頂部）。

除非我不理解你，否則你試圖從菜單中啓動它的事實完全是重點。你可以從任何地方開始。