Android 根据字符串动态获取资源ID

1.常用方法
public int getResId(String name,Context context){
    Resources r　＝　ｃｏｎｔｅｘｔ.getResources();
    int id = r.getIdentifier(name,"drawable","ｃｏｍ.demo");
    return id;
}

２．使用反射（推荐，性能高）
public class ResourceMan {
    public static int getResId(String variableName, Class<?> c) {
        try {
            Field idField = c.getDeclaredField(variableName);
            return idField.getInt(idField);
        } catch (Exception e) {
            e.printStackTrace();
            return -1;
        }
    }
}

使用方法：

int id = ResourceMan.getResId("icon",R.drawable.class);