獲取Java非法狀態嘗試添加視圖時通過膨脹xml導致異常

Question

Em獲取java.lang.IllegalStateException：指定的子項已具有父項。您必須先調用子對象的父對象的removeView（）。

無法找出哪個視圖已被刪除，任何幫助將非常有幫助。

這裏是代碼片段

main.xml中

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:id="@+id/mainLayout" 
    android:layout_height="fill_parent" 
    android:orientation="vertical" > 

</RelativeLayout> 

data.xml中

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" > 

    <TextView 
     android:id="@+id/txt" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="TextView" /> 

</RelativeLayout> 

活動代碼

public class ToDo extends Activity { 
    /** Called when the activity is first created. */ 
    Button addNew; 
    RelativeLayout mainLayout; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     mainLayout=(RelativeLayout)findViewById(R.id.mainLayout); 

     RelativeLayout rel; 
     LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); 

     for(int idx=0;idx<2;idx++){ 
      RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(
        LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 

      rel = (RelativeLayout) inflater.inflate(R.layout.data,null); 
      params.setMargins(0, 50, 0, 0); 

      TextView fromWeb= (TextView) rel.findViewById(R.id.txt); 
      fromWeb.setText("AA"); 

      mainLayout.addView(rel,params); 
     } 

    } 
} 

Answer 1

下面的代碼是不正確：

TextView fromWeb= (TextView) rel.findViewById(R.id.txt); 
fromWeb.setText("AA"); 
rel.addView(fromWeb,params); // the TextView is alredy in the rel RelativeLayout! 
mainLayout.addView(rel); 

，因爲你要添加再次（與addView法）TextView這已經是在佈局文件（如你之前搜索它findViewById）。相反，它應該是這樣的：

TextView fromWeb= (TextView) rel.findViewById(R.id.txt); 
fromWeb.setText("AA"); 
mainLayout.addView(rel); 

如果你想爲你的TextView然後將它們設置在佈局文件邊距：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" > 

    <TextView 
     android:id="@+id/txt" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_marginTop="50dp" 
     android:text="TextView" /> 

</RelativeLayout>