java android getResources（）。getIdentifier（）

Question

如何從R獲取int id值來獲取id？當我使用getIdentifier時，它僅返回0。

int i = getArguments().getInt(SELECTION_NUMBER); 
String drawerSelection = getResources().getStringArray(R.array.drawerSelection_array)[i]; 

int panelId = this.getResources().getIdentifier(drawerSelection.toLowerCase(),"id",getActivity().getPackageName()); 

編輯

的Xml

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

<ListView 
    android:id="@+id/Bus_Schedules" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" > 
</ListView> 

</LinearLayout> 

日誌

06-10 21:24:30.372: I/System.out(3572): Selection = Bus_Schedules 
06-10 21:24:30.372: I/System.out(3572): panelId = 0 

R.java

public static final class id { 
    public static final int Bus_Schedules=0x7f090004; 
    public static final int basemenu=0x7f090005; 
    public static final int content_frame=0x7f090001; 
    public static final int drawer_layout=0x7f090000; 
    public static final int left_drawer=0x7f090002; 

int id = getResources().getIdentifier("resourcename", "drawable", getPackageName()); 

getResources回報int：

Answer 1

這個問題似乎是要轉換drawerSelection爲小寫。正如R.java文件中清楚的那樣，標識符的情況被保留。嘗試撥打：

int panelId = this.getResources().getIdentifier(drawerSelection,"id",getActivity().getPackageName()); 

Answer 2

在一個項目中，我正在寫，現在就籤回。

更新：檢查R.array.drawerSelection_array以僅包含現有元素的ID。

Answer 3

試試這種方法。

public static int getResId(String fieldName, Context context, Class<?> c) { 

    try { 
     Field field= c.getDeclaredField(fieldName); 
     return field.getInt(field); 
    } catch (Exception e) { 
     return 0; 
    } 
} 

調用

//edtUserName is my field id 
getResId("edtUserName", context, id.class);