Android 桌面部件

桌面部件是一种利用AppWidget框架将应用程序的某个部件放在桌面。

res/layout/digitalclock.xml

1. <?xml version="1.0" encoding="utf-8"?>
2. <TextView xmlns:android="http://schemas.android.com/apk/res/android"
3. android:id="@+id/time"
4. android:textSize="45px"
5. android:textStyle="bold"
6. android:textColor="#FFFFFFFF"
7. android:background="@drawable/bg"
8. android:layout_width="wrap_content"
9. android:layout_height="wrap_content" />

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/time"
    android:textSize="45px"
    android:textStyle="bold"
    android:textColor="#FFFFFFFF"
    android:background="@drawable/bg"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

res/xml/est_appwidget.xml

1. <?xml version="1.0" encoding="utf-8"?>
2. <appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
3. android:minWidth="146dip"
4. android:minHeight="72dip"
5. android:updatePeriodMillis="1000"
6. android:initialLayout="@layout/digitalclock" />

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:minWidth="146dip"
    android:minHeight="72dip"
    android:updatePeriodMillis="1000"
    android:initialLayout="@layout/digitalclock" />

AndroidManifest.xml

1. <?xml version="1.0" encoding="utf-8"?>
2. <manifest xmlns:android="http://schemas.android.com/apk/res/android"
3. package="com.studio.android.chp10.ex4"
4. android:versionCode="1"
5. android:versionName="1.0">
6. <application android:icon="@drawable/icon"
7. android:label="@string/app_name">
8. <receiver android:name="ESTTime"
9. android:label="@string/app_name">
10. <intent-filter>
11. <action
12. android:name=
13. "android.appwidget.action.APPWIDGET_UPDATE" />
14. </intent-filter>
15. <meta-data android:name="android.appwidget.provider"
16. android:resource="@xml/est_appwidget" />
17. </receiver>
18. <service android:name=".ESTTime$UpdateService" />
19. </application>
20. <uses-sdk android:minSdkVersion="3" />
21. </manifest>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.studio.android.chp10.ex4"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon"
                 android:label="@string/app_name">
        <receiver android:name="ESTTime"
                  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/est_appwidget" />
        </receiver>
        <service android:name=".ESTTime$UpdateService" />
    </application>
    <uses-sdk android:minSdkVersion="3" />
</manifest> 

1. import android.app.Service;
2. import android.appwidget.AppWidgetManager;
3. import android.appwidget.AppWidgetProvider;
4. import android.content.ComponentName;
5. import android.content.Context;
6. import android.content.Intent;
7. import android.os.IBinder;
8. import android.text.format.Time;
9. import android.widget.RemoteViews;
10. public class ESTTime extends AppWidgetProvider {
11. @Override
12. public void onUpdate(Context context,
13. AppWidgetManager appWidgetManager,int[] appWidgetIds) {
14. context.startService(new Intent(context,UpdateService.class));
15. }
16. public static class UpdateService extends Service {
17. @Override
18. public void onStart(Intent intent, int startId) {
19. Time estTime = new Time("EST");
20. estTime.setToNow();
21. //传入所在包包名和布局文件
22. RemoteViews updateViews = new RemoteViews(getPackageName(),R.layout.digitalclock);
23. updateViews.setTextViewText(R.id.time,
24. estTime.format("%H:%M"));
25. ComponentName thisWidget =
26. new ComponentName(this, ESTTime.class);
27. AppWidgetManager manager =
28. AppWidgetManager.getInstance(this);
29. manager.updateAppWidget(thisWidget, updateViews);
30. }
31. @Override
32. public IBinder onBind(Intent intent) {
33. return null;
34. }
35. }
36. }

import android.app.Service;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.os.IBinder;
import android.text.format.Time;
import android.widget.RemoteViews;

public class ESTTime extends AppWidgetProvider {
    @Override
    public void onUpdate(Context context,
            AppWidgetManager appWidgetManager,int[] appWidgetIds) {
        context.startService(new Intent(context,UpdateService.class));
    }

    public static class UpdateService extends Service {
        @Override
        public void onStart(Intent intent, int startId) {
            Time estTime = new Time("EST");
            estTime.setToNow();
            //传入所在包包名和布局文件
            RemoteViews updateViews = new RemoteViews(getPackageName(),R.layout.digitalclock);
            updateViews.setTextViewText(R.id.time,
                    estTime.format("%H:%M"));

            ComponentName thisWidget =
                new ComponentName(this, ESTTime.class);
            AppWidgetManager manager =
                AppWidgetManager.getInstance(this);
            manager.updateAppWidget(thisWidget, updateViews);
        }

        @Override
        public IBinder onBind(Intent intent) {
            return null;
        }
    }
}

ESTTime.rar