10-05 23:39:48.187: E/AndroidRuntime(12854): Caused by: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
10-05 23:39:48.187: E/AndroidRuntime(12854): at android.view.ViewGroup.addViewInner(ViewGroup.java:1976)
10-05 23:39:48.187: E/AndroidRuntime(12854): at android.view.ViewGroup.addView(ViewGroup.java:1871)
10-05 23:39:48.187: E/AndroidRuntime(12854): at android.view.ViewGroup.addView(ViewGroup.java:1828)
10-05 23:39:48.187: E/AndroidRuntime(12854): at android.view.ViewGroup.addView(ViewGroup.java:1808)
10-05 23:39:48.187: E/AndroidRuntime(12854): at com.solar.WaterLevelActivity.InitUnitTimeLowestWaterLevel(WaterLevelActivity.java:49)
10-05 23:39:48.187: E/AndroidRuntime(12854): at com.solar.WaterLevelActivity.InitView(WaterLevelActivity.java:30)
10-05 23:39:48.187: E/AndroidRuntime(12854): at com.solar.WaterLevelActivity.onCreate(WaterLevelActivity.java:25)
10-05 23:39:48.187: E/AndroidRuntime(12854): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
10-05 23:39:48.187: E/AndroidRuntime(12854): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
10-05 23:39:48.187: E/AndroidRuntime(12854): ... 11 more
補充說明：InitUnitTimeLowestWaterLevel()在OnCreate函數中被調用，用來初始化界面。實現的效果是動態添加界面。
下面是出錯的代碼：
View Code
1 private void InitUnitTimeLowestWaterLevel() { 2 LinearLayout listMachines = (LinearLayout) findViewById(R.id.water_level_page_water_level_setting); 3 LayoutInflater inflater = LayoutInflater.from(WaterLevelActivity.this); 4 View tlWaterLevelInfo = inflater.inflate(R.layout.unit_time_water_level_item, null); 5 listMachines.addView(tlWaterLevelInfo); 6 listMachines.addView(tlWaterLevelInfo); //這個地方出錯了。 7 }
錯誤的原因：通過LayoutInflater實例化的一個布局(View)。被重復添加了兩次。而一個View只能有一個父控件。當第二次添加的時候，又要改變這個控件的父控件（雖然是同一個父控件，但是也要通過改變該View的父控件來實現）。運行時又不允許一個有父控件的子控件在有了一個父控件時，改變他的父控件。
解決方案：重新用布局文件實例化一個子控件，再添加到父控件上。