不定期更新Widget

Question

我有一个小部件，其中包含一个TextView，我想要更新只有当Onreceive(){此接收器不是一个实现为widget}方法被调用。我不想定期更新小部件，但只有当我的Onreceive()被调用。

Recver.java

public class Recver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
                Widgetd.updatewid(context);
            }
    }
    }}

Widgetd.java

public class Widgetd extends AppWidgetProvider {

    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager,
            int[] appWidgetIds) {
        // TODO Auto-generated method stub
        super.onUpdate(context, appWidgetManager, appWidgetIds);
    }
    @Override
    public void onDeleted(Context context, int[] appWidgetIds) {
        // TODO Auto-generated method stub
        super.onDeleted(context, appWidgetIds);
    }
    static void updatewid(Context context){
        RemoteViews rv = new RemoteViews(context.getPackageName(),
                R.layout.widgetlay);
        rv.setTextViewText(R.id.widgetUpdateTv, "1");

    }
}

manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="delete.detailduplicate"
    android:versionCode="1"
    android:versionName="1.0" >
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
    <uses-permission android:name="android.permission.RECEIVE_SMS"/>
    <uses-permission android:name="android.permission.READ_SMS"/>
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="delete.detailduplicate.MainActivity"
            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="Newmain"></activity>
        <receiver android:name="Recver">
            <intent-filter android:priority="9999999">
        <action android:name="android.provider.Telephony.SMS_RECEIVED"></action>
    </intent-filter>
        </receiver>
        <receiver android:name="Widgetd">
            <intent-filter >
                <action 
                    android:name="android.appwidget.action.APPWIDGET_UPDATE" />
            </intent-filter>
            <meta-data
                android:name="android.appwidget.provider"
                android:resource="@xml/widgetsetter" />
        </receiver>
    </application>
</manifest>

widgetsetter.xml

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:initialLayout="@layout/widgetlay"
    android:minHeight="300dp"
    android:minWidth="72dp"
    android:updatePeriodMillis="0" >
</appwidget-provider>

Answer 1

Set updatePeriodMillis = "0":

<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
android:initialLayout="@layout/widget_initial_layout"
android:minHeight="40dp"
android:minWidth="40dp"
android:updatePeriodMillis="0"
android:widgetCategory="home_screen" 
android:previewImage="@drawable/my_app_logo"/>

在AndroidManifest中添加应该触发更新的意图(这里例如WIFI_STATE_CHANGED):

        <intent-filter>
            <action android:name="android.net.wifi.WIFI_STATE_CHANGED" />
        </intent-filter>

和在应用程序小部件代码调用你的updateWidget方法:

    @Override
    public void onReceive(Context context, Intent intent)
    {
            Log.d(TAG, "onReceive() " + intent.getAction());
            super.onReceive(context, intent);
            if (intent != null)
            {
                    if (WifiManager.WIFI_STATE_CHANGED_ACTION.equals(intent.getAction()))
                    {
                            updateWidgets(context);
                    }
            ...
            }
     }
    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds)
    {
         Log.d(TAG, "onUpdate()");
         updateWidgets(context);
    }

    private void updateWidgets(Context context)
    {
        AppWidgetManager m = AppWidgetManager.getInstance(context);
        if (m != null)
        {
            int[] appWidgetIds = 
                  m.getAppWidgetIds(new ComponentName(context, getClass()));
            if ((appWidgetIds != null) && (appWidgetIds.length > 0))
            {
                 final RemoteViews updateViews = 
                    new RemoteViews(context.getPackageName(),
                    R.layout.mywidget_layout);
                    ...
                    m.updateAppWidget(appWidgetIds, updateViews);
            }
        }
    }