android典型程式碼系列(二十六)------App widget的使用

App widget的使用：
第一步、建立widget類

package cn.beita.mobilesafe.receiver;
import cn.beita.mobilesafe.service.AppWightService;
import android.appwidget.AppWidgetProvider;
import android.content.Context;
import android.content.Intent;
public class AppWightReceiver extends AppWidgetProvider {
    @Override
    public void onDeleted(Context context, int[] appWidgetIds) {        
        super.onDeleted(context, appWidgetIds);
        Intent intent=new Intent(context,AppWightService.class);
        context.stopService(intent);
    }
    @Override
    public void onEnabled(Context context) {
        super.onEnabled(context);
        Intent intent=new Intent(context,AppWightService.class);
        context.startService(intent);
        System.out.println("Intent intent=new Intent(context,AppWightService.class);");
    }   
}

第二步、在清單檔案中進行配置

      <receiver android:name=".receiver.AppWightReceiver" >
            <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>

第三步、xml— example_appwidget_info

<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:minWidth="294dp"
    android:minHeight="72dp"
    android:updatePeriodMillis="0"
    android:initialLayout="@layout/example_appwidget">
</appwidget-provider>

第四步、建立佈局檔案：layout---example_appwidget

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" 
    android:background="@drawable/widget_bg_portrait"
    android:gravity="center_vertical|center_horizontal">
    <LinearLayout android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:background="@drawable/widget_bg_portrait_child"
        android:orientation="vertical"
        android:gravity="center_vertical"
        >
        <TextView android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dip"
            android:layout_marginTop="3dip"
            android:layout_marginBottom="3dip"
            android:id="@+id/tv_widget_count"
            android:text="程式數目"/>
        <ImageView android:layout_width="fill_parent"
            android:layout_height="1dip"
            android:background="@drawable/widget_bg_portrait_child_divider"/>
        <TextView android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:id="@+id/tv_widget_memeory"
            android:layout_marginLeft="10dip"
            android:layout_marginTop="3dip"
            android:layout_marginBottom="3dip"
            android:text="可用記憶體"/>

    </LinearLayout>
    <LinearLayout 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical">
        <RelativeLayout android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal">
            <ImageView android:layout_width="20dip"
                android:layout_height="20dip"
                android:src="@drawable/notification"
                android:id="@+id/iv_appname"
                android:layout_margin="4dip"/>
            <TextView android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/tv_appname"
                android:layout_toRightOf="@id/iv_appname"
                android:layout_alignBaseline="@id/iv_appname"
                android:layout_marginTop="5dip"
                android:text="手機衛士"/>
        </RelativeLayout>
        <Button android:layout_width="wrap_content"
            android:layout_marginLeft="10dip"
            android:paddingLeft="5dip"
            android:paddingRight="10dip"
            android:id="@+id/bt_example_appwidget"
            android:layout_height="wrap_content"
            android:background="@drawable/button_shape"
            android:text="一鍵清理"/>
    </LinearLayout>
</LinearLayout>

第五步、建立service時時地更新上面的appwidget

package cn.beita.mobilesafe.service;
public class AppWightService extends Service {
    private AppWidgetManager widgetManager;
    private ScheduledExecutorService pool;
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
    @Override
    public void onCreate() {
        super.onCreate();
        widgetManager=AppWidgetManager.getInstance(getApplicationContext());
        System.out.println("widgetManager=AppWidgetManager.ge");
        pool = Executors.newScheduledThreadPool(1);
        pool.scheduleAtFixedRate(new Runnable(){
                @Override
                public void run() {
                    ComponentName componentName=new ComponentName("cn.beita.mobilesafe", "cn.beita.mobilesafe.receiver.AppWightReceiver");
                    RemoteViews view = new RemoteViews("cn.beita.mobilesafe", R.layout.example_appwidget);
                    view.setTextViewText(R.id.tv_widget_count, "當前程式數為:"+TaskUtils.getAllProcess(AppWightService.this));
                    view.setTextColor(R.id.tv_widget_count, Color.RED);
                    view.setTextViewText(R.id.tv_widget_memeory, "當前可用記憶體為:"+TextFormat.getDataSize(TaskUtils.getAvailMemeoty(AppWightService.this)));
                    view.setTextColor(R.id.tv_widget_memeory, Color.RED);
                    Intent intent=new Intent(AppWightService.this,LockClearReceiver.class);
                    PendingIntent pendingIntent=PendingIntent.getBroadcast(getApplicationContext(), 0, intent, 0);
                    view.setOnClickPendingIntent(R.id.bt_example_appwidget, pendingIntent);
                    widgetManager.updateAppWidget(componentName, view);
                }
        }, 1, 2, TimeUnit.SECONDS);
    }
    @Override
    public void onDestroy() {
        super.onDestroy();
        pool.shutdown();
    }
}