android 使能/禁用四大組件pm.setComponentEnabledSetting無效

pm.setComponentEnabledSetting無效可能是因爲獲得pm的context不對，獲得pm的context要一一對應，context獲得時候的包名類名要與實際禁用掉的包名類名一致，如果需要禁掉多個圖標時，需要多個context獲得的pm去setComponentEnabledSetting

舉例：應用場景爲切換用戶的時候要求禁用掉桌面某個或多個圖標

frameworks\base\packages\SystemUI\src\com\android\systemui\GuestResumeSessionReceiver.java 

//xiaozheng add 
import android.content.ComponentName;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.app.ActivityManager;

 if (Intent.ACTION_USER_SWITCHED.equals(action)) {
            cancelDialog();
            int userId = intent.getIntExtra(Intent.EXTRA_USER_HANDLE, UserHandle.USER_NULL);
//xiaozheng add start
Context mActivationContext;
if(userId!=UserHandle.USER_OWNER){
try {

mContext=                                           

                                         context.createPackageContextAsUser("包名", 0,

new UserHandle(ActivityManager.getCurrentUser()));
} catch (NameNotFoundException e) {
Log.i("xiaozheng", "get context error!");
mActivationContext = context;
}
PackageManager pm = mContext.getPackageManager();
ComponentName cn = new ComponentName("包名", 
"類名"); 
pm.setComponentEnabledSetting(cn,
PackageManager.COMPONENT_ENABLED_STATE_DISABLED,0);
//xiaozhen add end 
}