单击按钮后如何通过服务执行小部件更新？
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【中文标题】单击按钮后如何通过服务执行小部件更新？【英文标题】：how to perform widget update by service after clicking a button? 【发布时间】：2012-02-05 10:04:43 【问题描述】：这是我最初尝试部署小部件时的配置活动。
public class WeatherAppWidgetConfigure extends PreferenceActivity
private List<WeatherForecast> weatherData = new ArrayList<WeatherForecast>();
private String city_url;
private String city_key;
OnSharedPreferenceChangeListener listener;
int mAppWidgetId;
WeatherForecast wfObj;
@Override
public void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
// Set the result to CANCELED. This will cause the widget host to cancel
// out of the widget placement if they press the back button.
setResult(RESULT_CANCELED);
addPreferencesFromResource(R.xml.prefs);
// Find the widget id from the intent.
Intent intent = getIntent();
Bundle extras = intent.getExtras();
if (extras != null)
//Here I do some PreferenceActivity
mAppWidgetId = extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID,
AppWidgetManager.INVALID_APPWIDGET_ID);
System.out.println(mAppWidgetId);
SharedPreferences prefs = PreferenceManager.
getDefaultSharedPreferences(getBaseContext());
listener = new SharedPreferences.OnSharedPreferenceChangeListener()
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,
String key)
SharedPreferences prefs = PreferenceManager.
getDefaultSharedPreferences(getBaseContext());
city_url = prefs.getString("cities",
"http://www.yr.no/place/Nepal/Bagmati/Kathmandu/forecast.xml");
//System.out.println(city_url);
if (city_url.contains("Kathmandu")) city_key = "Kathmandu";
else if( city_url.contains("Växjö")) city_key = "Växjö";
else city_key = "Los Angeles";
try
URL url = new URL(city_url);
WeatherReport report = WeatherHandler.getWeatherReport(url);
int count = 0;
for (WeatherForecast forecast : report)
count++;
//System.out.println("Forecast "+count);
//System.out.println( forecast.toString() );
weatherData.add(forecast);
wfObj = weatherData.get(0);
catch (IOException ioe )
ioe.printStackTrace();
RemoteViews views = new RemoteViews(getBaseContext().getPackageName(),
R.layout.widget_layout);
String temp = new Integer(wfObj.getTemp()).toString()+"C";
String date = wfObj.getStartYYMMDD();
String rain = new Double(wfObj.getRain()).toString()+"mm/h";
prefs.edit().putString("temp",temp).commit();
prefs.edit().putString("date",date).commit();
prefs.edit().putString("rain", rain).commit();
views.setTextViewText(R.id.city, city_key);
views.setTextViewText(R.id.temp, prefs.getString("temp", ""));
views.setTextViewText(R.id.date, prefs.getString("date", ""));
views.setTextViewText(R.id.rain, prefs.getString("rain", ""));
AppWidgetManager appWidgetManager = AppWidgetManager.
getInstance(getBaseContext());
appWidgetManager.updateAppWidget(mAppWidgetId, views);
//System.out.println(temp +" "+date+" "+ rain);
// Make sure we pass back the original appWidgetId
Intent resultValue = new Intent();
resultValue.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, mAppWidgetId);
setResult(RESULT_OK, resultValue);
finish();
;
prefs.registerOnSharedPreferenceChangeListener(listener);
// If they gave us an intent without the widget id, just bail.
if (mAppWidgetId == AppWidgetManager.INVALID_APPWIDGET_ID)
finish();
现在我在这里有我的提供程序类，当我单击按钮时，我想在其中进行小部件更新（例如更改文本视图）。 公共类 MyWeatherAppWidgetProvider 扩展 AppWidgetProvider
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int[] appWidgetIds)
// TODO Auto-generated method stub
final int N = appWidgetIds.length;
Intent intent = new Intent(context.getApplicationContext(),
UpdateWeatherAppWidgetService.class);
intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, appWidgetIds);
PendingIntent pendingIntent = PendingIntent.getService(context.getApplicationContext(), 0, intent,
PendingIntent.FLAG_UPDATE_CURRENT);
RemoteViews remoteViews = new RemoteViews(context.getPackageName(),
R.layout.widget_layout);
remoteViews.setOnClickPendingIntent(R.id.button1, pendingIntent);
appWidgetManager.updateAppWidget(appWidgetIds, remoteViews);
我还使用服务类来完成此更新。这里对于启动我只想更改其中一个 textview 标签，只是为了看看它是如何工作的
public class UpdateWeatherAppWidgetService extends Service
@Override
public int onStartCommand(Intent intent, int flags, int startId)
System.out.println("called");
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(this
.getApplicationContext());
Bundle extras = intent.getExtras();
int[] appWidgetIds = extras.getIntArray(AppWidgetManager.EXTRA_APPWIDGET_IDS);
//other way
//int[] appWidgetIds =intent.getIntArrayExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS);
for(int widgetId : appWidgetIds)
System.out.println(widgetId);
if (appWidgetIds.length > 0)
for (int widgetId : appWidgetIds)
RemoteViews remoteViews = new RemoteViews(getPackageName(),
R.layout.widget_layout);
remoteViews.setTextViewText(R.id.city, "BLAh");
appWidgetManager.updateAppWidget(widgetId, remoteViews);
stopSelf(startId);
super.onStart(intent, startId);
return START_STICKY;
@Override
public IBinder onBind(Intent arg0)
// TODO Auto-generated method stub
return null;
但我不知何故无法完成这项工作。当我在提供程序类中使用 context.startService(intent) 时，服务类被调用。但是小部件上的这个文本视图再次没有改变。我还没有看到解释配置（在启动时）和稍后在用户单击时更新小部件的教程。所以我不确定我的方法。我的清单文件为
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="assignment3.demos"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="10" />
<application android:icon="@drawable/icon" android:label="@string/app_name">
<uses-library android:name="com.google.android.maps"/>
<activity android:name=".MainListActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="TheCityMap"></activity>
<activity android:name=".RoadMapActivity"></activity>
<activity android:name=".TheRoadMap"></activity>
<!-- <activity android:name="assignment3.demos.EditPrefs" android:label="Edit Preferences"/> -->
<!-- <activity android:name=".VaxjoWeather" android:label="Vaxjo Weather"/> -->
<activity android:name=".WeatherAppWidgetConfigure">
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_CONFIGURE" />
</intent-filter>
</activity>
<service android:enabled="true" android:name=".UpdateWeatherAppWidgetService"></service>
<receiver android:name="MyWeatherAppWidgetProvider">
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
</intent-filter>
<meta-data android:name="android.appwidget.provider"
android:resource="@xml/widgetproviderinfo" />
</receiver>
</application>
<uses-permission android:name="android.permission.INTERNET" > </uses-permission>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" > </uses-permission>
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" > </uses-permission>
【问题讨论】：
所以我说你可以启动服务，但服务不能正常工作，对吗？ 当我在提供程序类中使用 context.startService(intent) 时，最初尝试部署小部件时会调用服务类。稍后当我单击按钮时它不起作用。 【参考方案1】：一定是你的小部件提供程序中的这一行有问题
PendingIntent pendingIntent = PendingIntent.getService(context.getApplicationContext(), 0, intent,
PendingIntent.FLAG_UPDATE_CURRENT);
很可能是“context.getApplicationContext()”的问题 尝试使用几个不同的值，例如“Context”、“context”、“getBaseContext()”或“this”。我不确定哪个是正确的，在我的应用程序的类似情况下，我使用“上下文”，这对我有用。
也尝试改变
Intent intent = new Intent(context.getApplicationContext(),
UpdateWeatherAppWidgetService.class);
到：
Intent intent = new Intent(context, UpdateWeatherAppWidgetService.class);
【讨论】：
我使用了 PendingIntent pendingIntent = PendingIntent.getService(context, 0, intent, 0);但这一个也不好用 编辑了另一个建议，如果这不起作用我没有想法，对不起！【参考方案2】：嘿，我在 Vaxjo 参加你的 android 课程：D 对于您的问题：我在 AppWidgetProvider 中解决了这个问题，然后通过一些小改动“将其转移到服务”。
private static final String WIDGET_BUTTON = "com.example.ass3.WIDGET_BUTTON";
@Override
public int onStartCommand(Intent intent,int flag, int startId)
System.out.println("inService");
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(this
.getApplicationContext());
RemoteViews views = new RemoteViews(this.getApplicationContext().getPackageName(), R.layout.main);
ComponentName watchWidget = new ComponentName(this.getApplicationContext(), WeatherWidget.class);
views.setOnClickPendingIntent(R.id.widget_refresh, myIntent( WIDGET_BUTTON,this.getApplicationContext()));
appWidgetManager.updateAppWidget(watchWidget, views);
stopSelf(startId);
return START_STICKY;
protected PendingIntent myIntent(String button,Context context)
Intent intent = new Intent(context, WeatherWidget.class);
intent.setAction(button);
return PendingIntent.getBroadcast(context, 0, intent, 0);
在你的 Widget Provider 中
@Override
public void onReceive(Context context, Intent intent)
super.onReceive(context, intent);
//Toast.makeText(context, "onReceiver()", Toast.LENGTH_LONG).show();
//System.out.println("Intent get Action"+ intent.getAction());
if (WIDGET_BUTTON.equals(intent.getAction()))
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.main);
ComponentName widget = new ComponentName(context, WeatherWidget.class);
remoteViews.setTextViewText(R.id.widget_curtemp, "20");
remoteViews.setTextViewText(R.id.widget_minmaxtemp, "10/30");
remoteViews.setImageViewResource(R.id.widget_image, R.drawable.sun);
remoteViews.setTextViewText(R.id.widget_city, "vaxjo");
remoteViews.setTextViewText(R.id.widget_desc,"trying to refreshs");
appWidgetManager.updateAppWidget(widget, remoteViews);
以及 Manifest 中的服务权限和接收广播的权限。 请不要判断我更新盒子的硬连线值，我仍在尝试找出如何正确获取数据：D
【讨论】：
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