import com.google.android.apps.dashclock.DashClockService; //导入依赖的package包/类
@Override
protected void onStop() {
    super.onStop();

    // Update extensions (settings may have changed)
    // TODO: update only those extensions whose settings have changed
    Intent updateExtensionsIntent = new Intent(this, DashClockService.class);
    updateExtensionsIntent.setAction(DashClockService.ACTION_UPDATE_EXTENSIONS);
    updateExtensionsIntent.putExtra(DashClockService.EXTRA_UPDATE_REASON,
            DashClockExtension.UPDATE_REASON_SETTINGS_CHANGED);
    startService(updateExtensionsIntent);

    // Update all widgets, including a new one if it was just added
    // We can't only update the new one because settings affecting all widgets may have
    // been changed.
    LOGD(TAG, "Updating all widgets");

    Intent widgetUpdateIntent = new Intent(this, DashClockService.class);
    widgetUpdateIntent.setAction(DashClockService.ACTION_UPDATE_WIDGETS);
    startService(widgetUpdateIntent);
}
 

import com.google.android.apps.dashclock.DashClockService; //导入依赖的package包/类
public void showExtensionSettings(Context context, ExtensionListing listing){
    if (listing.settingsActivity() == null) {
        // Nothing to show
        return;
    }

    // Start the proxy activity
    Intent i = new Intent(context, ExtensionSettingActivityProxy.class);
    i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    i.putExtra(DashClockService.EXTRA_COMPONENT_NAME, listing.componentName().flattenToString());
    i.putExtra(ExtensionSettingActivityProxy.EXTRA_SETTINGS_ACTIVITY,
            listing.settingsActivity().flattenToString());
    startActivity(i);
}
 

import com.google.android.apps.dashclock.DashClockService; //导入依赖的package包/类
@Override
public void onReceive(Context context, Intent intent) {
    // Update weather
    // TODO: there should be a way for an extension to request an update through the API
    // See issue 292.
    context.startService(new Intent(context, DashClockService.class)
            .setAction(DashClockService.ACTION_UPDATE_EXTENSIONS)
            .putExtra(DashClockService.EXTRA_UPDATE_REASON,
                    DashClockExtension.UPDATE_REASON_UNKNOWN) // TODO: UPDATE_REASON_RETRY
            .putExtra(DashClockService.EXTRA_COMPONENT_NAME,
                    new ComponentName(context, WeatherExtension.class)
                            .flattenToShortString()));

}