android中的appwidget理解巩固

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);

}

//当最后一个appwidget删除后

@Override

public void onDisabled(Context context) {

// TODO Auto-generated method stub

System.out.println("-------------onDisabled----------------");

super.onDisabled(context);

}

//当第一次被创建时

@Override

public void onEnabled(Context context) {

// TODO Auto-generated method stub

System.out.println("-------------onEnabled----------------");

super.onEnabled(context);

}

//接收广播

@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);

}

}

//用于更新操作

@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文件里面

<receiver android:name="MyAppWidget" android:exported="false">

<!-- 所需要满足的过滤器 -->

<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>

学了这么久，总结点appwidget的自己理解的东西记录下来！

执行顺序：

首先-->在桌面创建appwidget桌面小程序，

重点是 <intent-filter>

<action android:name="cxd.appwidget.BUTTON_ONCLICK" />

</intent-filter>

和代码里的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);是将private static final String CLICK_ACTION="cxd.appwidget.BUTTON_ONCLICK";设置action来执行

然后和manifest里的 <intent-filter>

<action android:name="cxd.appwidget.BUTTON_ONCLICK" />

</intent-filter>比对，如果相匹配就为pendingIntent对象的广播事件设置这个action，所以在onReceive里面就用String actionString = intent.getAction();得到

在manifest匹配的action对象

还有种比较简单的使用getActivity(Context context, int requestCode, Intent intent, int flags); 创建PendingIntent对象

其中的intent对象是通过Intent intent = new Intent（context,XXX.class）;来创建的，可以开启一个activity