widget用法

September 23, 2015 8:21 PM

创建AppWidgetProvider的子类

public class MyAppWidgetProvider extends AppWidgetProvider {
@Override
public void onEnabled(Context context) {
    // 第一次创建执行
    // 服务监控进程状态
    Intent service = new Intent(context,TaskWidgetService.class);
    context.startService(service);
    super.onEnabled(context);
}

@Override
public void onDisabled(Context context) {
    //删除最后一个执行
    Intent service = new Intent(context,TaskWidgetService.class);
    context.stopService(service);
    super.onDisabled(context);
}
}

创建xml文件夹，创建info的xml文件

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:initialLayout="@layout/process_widget"
    android:minHeight="72.0dip"
    android:minWidth="294.0dip"
    android:updatePeriodMillis="0" />

配置清单文件

<receiver android:name="ExampleAppWidgetProvider" >
    <intent-filter>
    <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
    </intent-filter>
    <meta-data android:name="android.appwidget.provider"
    android:resource="@xml/example_appwidget_info" />
</receiver>

广播一定要在清单文件中注册

 <receiver android:name="com.itheima.mobilesafe13.receiver.WidgetClearTaskReceiver">
    <intent-filter >然后在显示Toast的地方
        <action android:name="widget.clear.task"></action>
        </intent-filter>
</receiver>
<receiver android:name="com.itheima.mobilesafe13.receiver.MyAppWidgetProvider" >
    <intent-filter>
        <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
    </intent-filter>
    <meta-data
        android:name="android.appwidget.provider"
        android:resource="@xml/process_widget_provider" />
    </receiver>

使用widget

/**
* @author Administrator
* @desc 清理进程的widget的服务
*/
public class TaskWidgetService extends Service {

    private AppWidgetManager mAWM;

    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void onCreate() {
        mAWM = AppWidgetManager.getInstance(getApplicationContext());
        System.out.println("widget  service create");

        Timer timer = new Timer();
        TimerTask task = new TimerTask() {

            @Override
            public void run() {
                updateWidgetMessage();

            }
        };
        timer.schedule(task, 0 , 1000 * 2);
        super.onCreate();
    }

    protected void updateWidgetMessage() {
        ComponentName provider = new ComponentName(getApplicationContext(), MyAppWidgetProvider.class);
        RemoteViews views = new RemoteViews(getPackageName(), R.layout.process_widget);
        views.setTextViewText(R.id.tv_process_count, "运行中的软件:" + TaskInfoUtils.getAllRunningAppInfos(getApplicationContext()).size());
        views.setTextViewText(R.id.tv_process_memory, "可用内存:" + Formatter.formatFileSize(getApplicationContext(),
                TaskInfoUtils.getAvailMem(getApplicationContext())));

        Intent intent = new Intent();
        intent.setAction("widget.clear.task");
        PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, intent , 0);
        views.setOnClickPendingIntent(R.id.btn_clear, pendingIntent );
        // 更新widget界面
        mAWM.updateAppWidget(provider, views);
    }

    @Override
    public void onDestroy() {
        // TODO Auto-generated method stub
        System.out.println("widget  service stop");
        super.onDestroy();
    }

}