Android 桌面部件

时间：2021-09-16 16:03:02

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。
Android 桌面部件

Android 桌面部件

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

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