android - 通过 AppWidgetManager 更新我自己的小部件时，电源控制小部件显示了一小会儿，这是什么问题？

Question

我在通过 AppWidgetManager.updateAppWidget 手动更新我的小部件时遇到了问题。平台为 Android 2.2。

代码如下:
我在 list 中为现有 Activity 额外声明了小部件:

<receiver android:name=".Widget" android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
        </intent-filter>
        <meta-data android:name="android.appwidget.provider" android:resource="@xml/widget" />
</receiver>

小部件类在 Widget.java 中声明:

public class Widget extends AppWidgetProvider {
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
    int use_static_ip;
    RemoteViews remoteViews;

    try {
        use_static_ip = Settings.System.getInt(context.getContentResolver(), Settings.System.WIFI_USE_STATIC_IP);
        if (use_static_ip == 0) { //DHCP
            remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget_dhcp);
        } else { //static IP
            remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget_static);
        }
        Intent call_activity = new Intent(context, StaticIPToggle.class);
        PendingIntent pending_call_activity = PendingIntent.getActivity(context, 0, call_activity, 0);
        remoteViews.setOnClickPendingIntent(R.id.widget_icon, pending_call_activity);
        appWidgetManager.updateAppWidget(appWidgetIds, remoteViews);
    } catch (SettingNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}
}

在现有 Activity 中，我添加了一些行来手动更新小部件:

        AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(getApplicationContext());
        ComponentName componentName = new ComponentName(getApplicationContext(), Widget.class);
        int[] ids = appWidgetManager.getAppWidgetIds(componentName);
        Intent update_widget = new Intent();
        update_widget.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, ids);
        update_widget.setAction(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
        getApplicationContext().sendBroadcast(update_widget);

但是现在我有这个错误:如果 widget 处于 onClicked 状态，它会在显示所需的 widget 之前短时间(~0,5sec-1sec)显示 energy-settings-widget。

这里是这个问题的截图(从左到右的顺序):http://i.stack.imgur.com/rHkjw.jpg

首先是左侧图片中的小部件，然后变为中间图片并在 ~0.5-1 秒后停留在那里或变为右侧图片。

很遗憾，我看不到代码中有任何错误，你呢？

希望你能帮我解决这个问题；)提前致谢，问候，奥利

Answer 1

我遇到了完全相同的问题。我通过手动更新小部件而不是通过广播，而是直接调用 AppWidgetManager.updateAppWidget(ComponentName, RemoteViews) 解决了这个问题。相反，来自 AsyncTask。

在你的 Widget 类中试试这个:

/**
 * Asynchronously builds views and updates the widget.
 */
private static class UpdateWidgetTask extends AsyncTask<Void, Void, RemoteViews> {
    private AppWidgetManager mAppWidgetManager;
    private Context mContext;

    private UpdateWidgetTask(AppWidgetManager appWidgetManager, Context context) {
        mAppWidgetManager = appWidgetManager;
        mContext = context;
    }

    @Override
    protected RemoteViews doInBackground(Void... params) {
        DebugLog.d(TAG, "Asynchronously updating widget.");
        RemoteViews views = buildUpdate(mContext);
        return views;
    }

    @Override
    protected void onPostExecute(RemoteViews views) {
        ComponentName thisWidget = new ComponentName(mContext, Widget.class);
        mAppWidgetManager.updateAppWidget(thisWidget, views);
    }
}

/**
 * Asynchronously updates all widgets of this type. This is the fastest way to update the widget.
 *
 * @param context The context.
 */
public static void updateWidget(Context context) {
    new UpdateWidgetTask(AppWidgetManager.getInstance(context), context).execute();
}

然后通过从您的 Activity 调用 Widget.updateWidget(this) 进行更新。