Android笔记之AppWidget

1、AndroidMainfeast配置文件

<receiver android:name="MyAppWidgetProvider" >
    <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>

xml/example_appwidget_info是widget的属性文件

MyAppWidgetProvider是继承AppWidgetProvider的类名

2、xml配置文件

<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:minWidth="40dp"
    android:minHeight="40dp"
    android:updatePeriodMillis="86400000"
    android:previewImage="@drawable/preview"
    android:initialLayout="@layout/example_appwidget"
    android:configure="com.example.android.ExampleAppWidgetConfigure" 
    android:resizeMode="horizontal|vertical"
    android:widgetCategory="home_screen|keyguard"
    android:initialKeyguardLayout="@layout/example_keyguard">
</appwidget-provider>

 3、layout/example_appwidget设计插件的布局

4、MyAppWidgetProvider类

@Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager,
            int[] appWidgetIds) {
        final int N = appWidgetIds.length;

        // Perform this loop procedure for each App Widget that belongs to this
        // provider
        for (int i = 0; i < N; i++) {
            int appWidgetId = appWidgetIds[i];

            // Create an Intent to launch ExampleActivity
            Intent intent = new Intent();
            intent.setAction(action_button);
            PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0,
                    intent, 0);

            // Get the layout for the App Widget and attach an on-click listener
            // to the button
            RemoteViews views = new RemoteViews(context.getPackageName(),
                    R.layout.appwidgetlayout);
            views.setOnClickPendingIntent(R.id.button1, pendingIntent);

            // Tell the AppWidgetManager to perform an update on the current app
            // widget
            appWidgetManager.updateAppWidget(appWidgetId, views);

        }
    }

@Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        String action = intent.getAction();
        if (action.equals(action_button)) {
            Log.i("onReceive", "-->"+action);

        }
        super.onReceive(context, intent);
    }

 5、设置监听：

1. 监听点击显示toast：

Intent toastIntent = new Intent(context, MyAppWidgetProvider.class);
            // Set the action for the intent.
            // When the user touches a particular view, it will have the effect of
            // broadcasting TOAST_ACTION.
toastIntent.setAction(MyAppWidgetProvider.TOAST_ACTION);
PendingIntent toastPendingIntent = PendingIntent.getBroadcast(context, 0, toastIntent,0);
rv.setPendingIntent(R.id.btn, toastPendingIntent);

在由intent生成PendingIntent时，如果intent带数据（putExtra），则第四个参数是PendingIntent.FLAG_UPDATE_CURRENT