android中的appwidget理解鞏固

public class MyAppWidget extends AppWidgetProvider{

private static final String CLICK_ACTION="cxd.appwidget.BUTTON_ONCLICK";
@Override
public void onDeleted(Context context, int[] appWidgetIds) {
// TODO Auto-generated method stub
System.out.println("-------------onDeleted----------------");
super.onDeleted(context, appWidgetIds);
}

//當最後一個appwidget刪除後
@Override
public void onDisabled(Context context) {
// TODO Auto-generated method stub
System.out.println("-------------onDisabled----------------");
super.onDisabled(context);
}

//當第一次被建立時
@Override
public void onEnabled(Context context) {
// TODO Auto-generated method stub
System.out.println("-------------onEnabled----------------");
super.onEnabled(context);
}

//接收廣播
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub

String actionString = intent.getAction();
System.out.println("-------------onReceive----------------"+actionString);
if(CLICK_ACTION.equals(actionString)){
System.out.println("===============");
RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.appwidget01);
remoteViews.setTextViewText(R.id.text01, context.getResources().getString(R.string.hello_world));
remoteViews.setViewVisibility(R.id.button01, View.INVISIBLE);
Toast.makeText(context, "success", Toast.LENGTH_SHORT).show();
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
ComponentName componentName = new ComponentName(context, MyAppWidget.class);
appWidgetManager.updateAppWidget(componentName, remoteViews);
}else{
super.onReceive(context, intent);
}

}

//用於更新操作
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int[] appWidgetIds) {
// TODO Auto-generated method stub
System.out.println("-------------onUpdate----------------");

Intent intent = new Intent();
intent.setAction(CLICK_ACTION);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, -1, intent, 0);
RemoteViews rViews = new RemoteViews(context.getPackageName(), R.layout.appwidget01);
rViews.setOnClickPendingIntent(R.id.button01, pendingIntent);
appWidgetManager.updateAppWidget(appWidgetIds, rViews);

}

}

在manifest檔案裡面

 <receiver android:name="MyAppWidget" android:exported="false">
            <!-- 所需要滿足的過濾器 -->
            <intent-filter>
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
            </intent-filter>
            <intent-filter>
                <action android:name="cxd.appwidget.BUTTON_ONCLICK" />
            </intent-filter>
             <meta-data
                android:name="android.appwidget.provider"
                android:resource="@xml/appwidget01_info" />
        </receiver>

學了這麼久，總結點appwidget的自己理解的東西記錄下來！

執行順序：

首先-->在案頭建立appwidget案頭小程式，

重點是  <intent-filter>
                <action android:name="cxd.appwidget.BUTTON_ONCLICK" />
            </intent-filter>

和代碼裡的Intent intent = new Intent();
intent.setAction(CLICK_ACTION);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, -1, intent, 0);和String actionString = intent.getAction();

intent.setAction(CLICK_ACTION);是將private static final String CLICK_ACTION="cxd.appwidget.BUTTON_ONCLICK";設定action來執行

然後和manifest裡的 <intent-filter>
                <action android:name="cxd.appwidget.BUTTON_ONCLICK" />
            </intent-filter>比對，如果相匹配就為pendingIntent對象的廣播事件設定這個action，所以在onReceive裡面就用String actionString = intent.getAction();得到

在manifest匹配的action對象

還有種比較簡單的使用getActivity(Context context, int requestCode, Intent intent, int flags);  建立PendingIntent對象

其中的intent對象是通過Intent  intent = new Intent（context,XXX.class）;來建立的，可以開啟一個activity