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我無法啓動服務來更新我創建的AppWidget作爲練習。我試圖從DDMS中獲取欺騙性位置數據的經度和緯度以顯示在小部件中。該小部件使用一個服務來更新TextView，這可能稍微有點矯枉過正，但我想要遵循這個模板，這在AppWidgets中似乎很常見，可以完成更多工作（如預測小部件或維基文庫小部件）。按鈕點擊無法啓動Android應用程序小部件中的服務
現在，我沒有收到任何錯誤消息或奇怪的行爲;按下按鈕時根本沒有任何事情發生。對於什麼可能是錯誤的，我有點神祕。任何人都可以指出我正確的方向嗎？
另外，如果我的位置邏輯有問題，我也會喜歡這方面的建議。我查看了幾個博客，Google示例和文檔，但我對它的工作原理感到有些模糊。
這裏是小工具的當前狀態：
public class Widget extends AppWidgetProvider
{
static final String TAG = "Widget";
/**
* {@inheritDoc}
*/
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int[] appWidgetIds)
{
// Create an intent to launch the service
Intent serviceIntent = new Intent(context, UpdateService.class);
// PendingIntent is required for the onClickPendingIntent that actually
// starts the service from a button click
PendingIntent pendingServiceIntent =
PendingIntent.getService(context, 0, serviceIntent, 0);
// Get the layout for the App Widget and attach a click listener to the
// button
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.main);
views.setOnClickPendingIntent(R.id.address_button, pendingServiceIntent);
super.onUpdate(context, appWidgetManager, appWidgetIds);
}
// To prevent any ANR timeouts, we perform the update in a service;
// really should have its own thread too
public static class UpdateService extends Service
{
static final String TAG = "UpdateService";
private LocationManager locationManager;
private Location currentLocation;
private double latitude;
private double longitude;
public void onStart(Intent intent, int startId)
{
// Get a LocationManager from the system services
locationManager =
(LocationManager) getSystemService(Context.LOCATION_SERVICE);
// Register for updates from spoofed GPS
locationManager.requestLocationUpdates("gps", 30000L, 0.0f, new LocationListener()
{
@Override
public void onLocationChanged(Location location)
{
currentLocation = location;
}
@Override
public void onProviderDisabled(String provider) {}
@Override
public void onProviderEnabled(String provider) {}
@Override
public void onStatusChanged(String provider, int status,
Bundle extras) {}
});
// Get the last known location from GPS
currentLocation =
locationManager.getLastKnownLocation("gps");
// Build the widget update
RemoteViews updateViews = buildUpdate(this);
// Push update for this widget to the home screen
ComponentName thisWidget = new ComponentName(this, Widget.class);
// AppWidgetManager updates AppWidget state; gets information about
// installed AppWidget providers and other AppWidget related state
AppWidgetManager manager = AppWidgetManager.getInstance(this);
// Updates the views based on the RemoteView returned from the
// buildUpdate method (stored in updateViews)
manager.updateAppWidget(thisWidget, updateViews);
}
public RemoteViews buildUpdate(Context context)
{
latitude = currentLocation.getLatitude();
longitude = currentLocation.getLongitude();
RemoteViews updateViews =
new RemoteViews(context.getPackageName(), R.layout.main);
updateViews.setTextViewText(R.id.latitude_text, "" + latitude);
updateViews.setTextViewText(R.id.longitude_text, "" + longitude);
return updateViews;
}
@Override
public IBinder onBind(Intent intent) {
// We don't need to bind to this service
return null;
}
}
}