java android getResources().getIdentifier()[英] java android getResources().getIdentifier()

问题描述

如何从r中获取int id值为id?当我使用getIdentifier它只是返回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());

编辑

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>

log

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;

推荐答案

问题似乎是您将drawerSelection转换为小写.如r.java文件中清除,保留了标识符的情况.尝试调用:

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

其他推荐答案

刚刚回收在我现在写的项目中:

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

getResources返回int.

更新:检查R.array.drawerSelection_array仅包含现有元素的ID.

其他推荐答案

尝试此方法.

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;
    } 
}

调用

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

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