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這是我最初嘗試部署小部件時的配置活動。如何在點擊按鈕後通過服務執行小部件更新？
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();
}
}
}
現在我有我的提供者類在這裏，當我點擊按鈕，我想要做小部件更新（chhnge textview爲eg）。 公共類MyWeatherAppWidgetProvider擴展的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);
}
}
而且我用的服務類來獲得此更新完成。這裏啓動我只是想改變TextView的標籤之一，只是爲了看看它是如何工作
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;
}
}
但不知何故，我不能讓這件事。當我在提供者類中使用context.startService（intent）時，服務類被調用。但是，這個widget上的這個textview也不會改變。我還沒有看過解釋配置（在啓動時）和稍後在用戶單擊時更新小部件的教程。所以我不確定我的方法。我有我的清單文件作爲
<?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>
所以我說的是你能夠啓動服務，但服務工作不正常？ – 2012-01-08 16:27:58
當我在提供者類中使用context.startService（intent）時，服務類在試圖部署widget時被調用。當我點擊按鈕時它不起作用。 – SASM 2012-01-08 16:34:22