Android 时间小部件未收到更新

Question

为什么我的 Android 时间小部件不自行更新？ 我为主屏幕创建了一个时间和日期小部件，但问题是我的时间小部件仅在屏幕方向更改（例如从横向更改为纵向）时才会更新。它应该在实时模式下自动更新。这是我的代码：

public class PointlessWidget extends AppWidgetProvider {
    Time mCalendar;
    float mMinutes;
    float mHour;

    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager,
            int[] appWidgetIds) {
        // TODO Auto-generated method stub
        super.onUpdate(context, appWidgetManager, appWidgetIds);

        mCalendar = new Time();

        // Line below sets time that will be displayed - modify if needed.
        mCalendar.setToNow();


        int hour = mCalendar.hour;
        int minute = mCalendar.minute;
        int second = mCalendar.second;

        mMinutes = minute + second / 60.0f;
        mHour = hour + minute / 60.0f;

        final int N = appWidgetIds.length;

        for (int i = 0; i < N; i++) {
            int awID = appWidgetIds[i];
            RemoteViews v = new RemoteViews(context.getPackageName(),
                    R.layout.widget);

            v.setTextViewText(R.id.textHour, " " + hour);
            v.setTextViewText(R.id.textMinute, " " + minute);

            appWidgetManager.updateAppWidget(awID, v);
        }
    }

     @Override
     public void onDeleted(Context context, int[] appWidgetIds) {
     // TODO Auto-generated method stub
     super.onDeleted(context, appWidgetIds);

     Toast.makeText(context, "Widget Deleted!", Toast.LENGTH_SHORT).show();
     }

}

这是我的清单：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.androidwidgets"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="11"
        android:targetSdkVersion="15" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

        <receiver android:name=".PointlessWidget" >
            <intent-filter>
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
            </intent-filter>

            <meta-data
                android:name="android.appwidget.provider"
                android:resource="@xml/widget_stuff" />
        </receiver>
        <service android:name="TimeSettableAnalogClockService"/>

        <activity android:name=".WidgetsConfig" >
            <intent-filter>
                <action android:name="android.appwidget.action.APPWIDGET_CONFIGURE" />
            </intent-filter>
        </activity>
    </application>

</manifest>

这是我的 widget_stuff xml。我已经设置了 updatePeriodMillis="1000" 或相当于 1 秒的转换时间。

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:initialLayout="@layout/widget"
    android:minHeight="30dp"
    android:minWidth="274dp"
    android:updatePeriodMillis="1000" >

</appwidget-provider>

Answer 1

要更新您的时间小部件，请使用 AlarmManager 类。

或者

您可以使用后台服务来更新您的时间小部件。

Answer 2

我已经在我的问题中找到了解决方案。为了与我有同样问题的其他人，我将分享我的代码：

import java.text.SimpleDateFormat;
import java.util.Calendar;

import android.os.Bundle;
import android.os.Handler;
import android.widget.TextView;
import android.widget.Toast;
import android.app.Activity;

public class DigitalClock extends Activity {
    private Runnable updateTimeTask;
    private Handler handler;

    public static final int TIME_UPDATE_INTERVAL_MSEC = 1000;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if (updateTimeTask == null) {
            updateTimeTask = new Runnable() {
                @Override
                public void run() {
                    // if (!DigitalClock.this.isActive()) return;

                    timeAndDate();
                    handler.postDelayed(this, TIME_UPDATE_INTERVAL_MSEC);
                }
            };
        }
        if (handler == null) {
            handler = new Handler();
        }
        handler.removeCallbacks(updateTimeTask);
        handler.postDelayed(updateTimeTask, TIME_UPDATE_INTERVAL_MSEC);
    }

    public void timeAndDate() {
        Calendar c = Calendar.getInstance();

        SimpleDateFormat time = new SimpleDateFormat("hh:mm:ss");
        SimpleDateFormat date = new SimpleDateFormat("MMMM dd yyyy");
        SimpleDateFormat day = new SimpleDateFormat("EEEE");
        SimpleDateFormat am_pm = new SimpleDateFormat("aa");
        String sTime = time.format(c.getTime());
        String sDate = date.format(c.getTime());
        String sDay = day.format(c.getTime());
        String sAm_Pm = am_pm.format(c.getTime());

        // formattedDate have current date/time
        Toast.makeText(this, sDate + " | " + sTime, Toast.LENGTH_SHORT).show();

        // Now we display value in TextView
        TextView txtTime = (TextView) findViewById(R.id.txtHour);
        TextView txtDay = (TextView) findViewById(R.id.txtDay);
        TextView txtDate = (TextView) findViewById(R.id.txtDate);
        TextView txtAm_Pm = (TextView) findViewById(R.id.txtAm_Pm);

        txtTime.setText(sTime);
        txtDate.setText(sDate);
        txtDay.setText(sDay);
        txtAm_Pm.setText(sAm_Pm);
    }
}