Question

我正在尝试编写一个应用小部件来显示一些时间相关的文本，并且每分钟更新一次。为了测试我的想法，我首先写了一个简单的 - 只是为了在小部件中以hh：mm显示时间。如果屏幕关闭，没有必要显示它，所以我使用两个接收器，一个用于屏幕开/关，另一个用于time_tick。屏幕关闭时，它会取消注册time_tick接收器。屏幕打开时，再次注册。第一次添加到HOME时效果很好。 Logcat还显示了小部件提供程序接收的预期意图：启用，更新（一次），update_options等。两个接收器也按预期工作。

但是在重新启动之后（断电然后再打开），小部件仍然在那里并且显示正确的时间一次，但是它有3个问题：

logcat显示收到了2个更新意图，尽管它们都运行良好。意图是启用，更新，更新（再次）和没有update_options
重启后显示正确的时间，没有接收器工作。显示的时间保持不变，屏幕上没有任何记录。
onDeleted只能清除共享首选项，然后在取消注册步骤失败，除非接收者未注册。

这是我的代码（我使用了一个小部件配置，但它没有做任何事情，所以我只是跳过它，日志也跳过了）。请帮忙。

清单：

    <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.senderj.testwidget2"
    android:versionCode="1"
    android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="15"
    android:targetSdkVersion="19" />
<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" >
    <activity android:name="com.senderj.testwidget2.HelloWidgetConfig" >
        <intent-filter>
            <action android:name="android.appwidget.action.APPWIDGET_CONFIGURE" />
        </intent-filter>
    </activity>
    <receiver
        android:name="com.senderj.testwidget2.HelloWidget"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
        </intent-filter>
        <meta-data
            android:name="android.appwidget.provider"
            android:resource="@xml/hello_widget_provider" />
    </receiver>
</application>

HelloWidget（provider）

    public class HelloWidget extends AppWidgetProvider {
    static final boolean debug = true;
    static final String ME = "TestWidget2";
    static final String CURRTEXT = "CurrText";
    static int[] thisAppWidgetIds;
    static ScreenReceiver sr;
    static IntentFilter scrFil;
    static HelloReceiver hr;
    static IntentFilter helloFil;

    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        thisAppWidgetIds = appWidgetIds;
        hr = new HelloReceiver(thisAppWidgetIds);
        helloFil = new IntentFilter();
        helloFil.addAction(Intent.ACTION_TIME_TICK);
        context.getApplicationContext().registerReceiver(hr, helloFil);
        sr = new ScreenReceiver(thisAppWidgetIds, hr);
        scrFil = new IntentFilter();
        scrFil.addAction(Intent.ACTION_SCREEN_ON);
        scrFil.addAction(Intent.ACTION_SCREEN_OFF);
        context.getApplicationContext().registerReceiver(sr, scrFil);
        refreshMyWidget(context, appWidgetManager, appWidgetIds);
        super.onUpdate(context, appWidgetManager, appWidgetIds);
    }//end onUpdate
    public static void updateMyWidget(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        SharedPreferences prefs = context.getSharedPreferences(ME, Context.MODE_PRIVATE);
        SharedPreferences.Editor spe = prefs.edit();
        String old_str = prefs.getString(CURRTEXT, "");
        String newText = addOne(old_str);
        spe.putString(CURRTEXT, newText);
        spe.commit();
        RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.main);
        remoteViews.setTextViewText(R.id.widget_textview, String.format("TIME = %s", newText));
    }//end updateMyWidget

    public static void refreshMyWidget(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        SharedPreferences prefs = context.getSharedPreferences(ME, Context.MODE_PRIVATE);
        SharedPreferences.Editor spe = prefs.edit();
        String old_str = prefs.getString(CURRTEXT, "");
        String newText = String.format("%tR", new java.util.Date());
        spe.putString(CURRTEXT, newText);
        spe.commit();
        RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.main);
        remoteViews.setTextViewText(R.id.widget_textview, String.format("TIME = %s", newText));
    }//end refreshMyWidget

    private static String addOne(String ss) {
        String[] arry = ss.split(":");
        int hh = Integer.parseInt(arry[0]);
        int mm = Integer.parseInt(arry[1]);
        if (++mm >59) {
            mm = 0;
            hh++;
        }//end if 
        return String.format("%02d:%02d", hh, mm);
    }//end addOne

    @Override
    public void onDeleted(Context context, int[] appWidgetIds) {
        SharedPreferences.Editor prefs = context.getSharedPreferences(ME, Context.MODE_PRIVATE).edit();
        prefs.clear();
        prefs.commit();
        //the following 2 failed with receiver not registered
        context.getApplicationContext().unregisterReceiver(hr);
        context.getApplicationContext().unregisterReceiver(sr);
        super.onDeleted(context, appWidgetIds);
    }//end onDeleted
}//end HelloWidget

HelloWidget xml

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:configure="com.senderj.testwidget2.HelloWidgetConfig"
    android:initialLayout="@layout/main"
    android:minHeight="40dp"
    android:minWidth="110dp"
    android:updatePeriodMillis="86400000" 
    android:widgetCategory="home_screen"
>
</appwidget-provider>

ScreenReceiver

    public class ScreenReceiver extends BroadcastReceiver {
    static final boolean debug = true;
    static final String ME = "TestWidget2";
    static int[] thisAppWidgetIds;
    static HelloReceiver hr;

    public ScreenReceiver() {
    }
    public ScreenReceiver(int[] widgetIds, HelloReceiver helloReceiver) {
        hr = helloReceiver;
        thisAppWidgetIds = widgetIds;
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        final String action = intent.getAction();
        if (action.equals(Intent.ACTION_SCREEN_ON)) {
            AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
            HelloWidget.refreshMyWidget(context, appWidgetManager, thisAppWidgetIds);
            hr = new HelloReceiver(thisAppWidgetIds);
            IntentFilter helloFil = new IntentFilter();
            helloFil.addAction(Intent.ACTION_TIME_TICK);
            context.getApplicationContext().registerReceiver(hr, helloFil);
        } else if (action.equals(Intent.ACTION_SCREEN_OFF)) {
            context.getApplicationContext().unregisterReceiver(hr);
        }//end if action.equals
}//end onReceive
}//end ScreenReceiver

HelloReceiver

    public class HelloReceiver extends BroadcastReceiver {
    static final boolean debug = true;
    static final String ME = "TestWidget2";
    static int[] thisAppWidgetIds;

    public HelloReceiver() {
    }

    public HelloReceiver(int[] widgetIds) {
          thisAppWidgetIds = widgetIds;
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        final String action = intent.getAction();
        if (action.equals(Intent.ACTION_TIME_TICK)) {
            AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
            HelloWidget.updateMyWidget(context, appWidgetManager, thisAppWidgetIds);
        }//end if action.equals
    }//end onReceive
}//end HelloReceiver

在app小部件中复制onUpdate

0 个答案: