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如何访问主屏幕的项目Widget,以便对它们进行更改,例如设置Button的文本?在我AppWidgetProvideronReceive()方法中,我试图设置 a 的文本Button,它位于我的主屏幕小部件中:

@Override
    public void onReceive(Context context, Intent intent)
    {
        if (intent.getAction().equals(MainActivity.ACTION_CHANGE_BUTTONSTATE))
        {
            String state = intent.getExtras().getString("state");
            Log.d("HomescreenWidget", "received broadcast for button state");

            RemoteViews views = new RemoteViews(context.getPackageName(),
                    R.id.widgetButton);
            views.setTextViewText(R.id.widgetButton, state);
            ComponentName cn = new ComponentName(context,
                    HomescreenWidget.class);
            AppWidgetManager.getInstance(context).updateAppWidget(cn, views);
        }
        super.onReceive(context, intent);
    }

我的小部件layout.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/RelativeLayout1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="@dimen/widget_margin" >

    <Button
        android:id="@+id/playButton_Widget"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:minWidth="80dp"
        android:text="@string/playButton" />
</RelativeLayout>

我收到了Broadcast,但随后我Widget显示以下文本:“问题加载小部件”。

编辑 我在目录日志中发现了以下消息:

W/AppWidgetHostView(135): updateAppWidget couldn't find any view, using error view
W/AppWidgetHostView(135): android.widget.RemoteViews$ActionException: can't find view: 0x7f0a0004

0x7f0a0004是我WidgetButton。可能是什么原因,找不到它?

4

3 回答 3

2

要通过 appwidget 提供程序访问您的视图,您可以使用此远程视图

RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget);
views.setTextViewText(R.id.widgetname, newName);

或通过服务:

public class UpdateWidgetService extends Service {

  @Override
  public IBinder onBind(Intent intent) {
    return null;
  }

  @Override
  public void onStart(Intent intent, int startId) {
    AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(this
        .getApplicationContext());

    int[] allWidgetIds = intent
        .getIntArrayExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS);

    for (int widgetId : allWidgetIds) {

      RemoteViews remoteViews = new RemoteViews(this
          .getApplicationContext().getPackageName(),
          R.layout.widget_layout);

      remoteViews.setTextViewText(R.id.update,
          "Random: " + String.valueOf(number));

      appWidgetManager.updateAppWidget(widgetId, remoteViews);
    }
    stopSelf();

    super.onStart(intent, startId);
  }

} 

并且不要忘记将服务添加到清单中

<service android:name=".UpdateWidgetService"></service> 

然后在 onUpdate 中(在您的 App Widget Provider 类中)

@Override
  public void onUpdate(Context context, AppWidgetManager appWidgetManager,
      int[] appWidgetIds) {

    ComponentName thisWidget = new ComponentName(context,
        MyWidgetProvider.class);
    int[] allWidgetIds = appWidgetManager.getAppWidgetIds(thisWidget);

    Intent intent = new Intent(context.getApplicationContext(),
        UpdateWidgetService.class);
    intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, allWidgetIds);

    context.startService(intent);
  }

我希望这可以帮助:)

于 2013-08-03T17:44:49.367 回答
0

我刚刚找到了解决方案。我一直在为按钮传递错误的 ID。的布局widgetButton中不存在。Widget这是我的主要按钮Activity

于 2013-08-04T13:49:11.200 回答
0

导入 android.widget.RemoteViews;

//抓取布局,然后设置名为 R.id.Counter 的 Button 的文本:

RemoteViews remoteViews = new RemoteViews(getPackageName(), R.layout.my_layout);
remoteViews.setTextViewText(R.id.Counter, "Set button text here");
于 2014-08-26T07:20:19.077 回答