我如何在android中使用broadcastreceiver

Question

我如何在android中使用broadcastreceiver，

请举例说明或参考。谢谢

Answer 1

看看这个：

1. http://developer.android.com/reference/android/content/BroadcastReceiver.html
2. http://developer.android.com/guide/topics/manifest/receiver-element.html

在AndroidManifest.xml文件中写下以下代码：

<receiver android:name=".appwidget.ExampleBroadcastReceiver" android:enabled="false">
   <intent-filter>
      <action android:name="android.intent.ACTION_TIMEZONE_CHANGED" />
      <action android:name="android.intent.ACTION_TIME" />
   </intent-filter>
</receiver>

并按如下方式定义类：

public class ExampleBroadcastReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        Log.d("ExmampleBroadcastReceiver", "intent=" + intent);

        // For our example, we'll also update all of the widgets when the timezone
        // changes, or the user or network sets the time.
        String action = intent.getAction();
        if (action.equals(Intent.ACTION_TIMEZONE_CHANGED)
                || action.equals(Intent.ACTION_TIME_CHANGED)) {
            AppWidgetManager gm = AppWidgetManager.getInstance(context);
            ArrayList<Integer> appWidgetIds = new ArrayList<Integer>();
            ArrayList<String> texts = new ArrayList<String>();

            ExampleAppWidgetConfigure.loadAllTitlePrefs(context, appWidgetIds, texts);

            final int N = appWidgetIds.size();
            for (int i=0; i<N; i++) {
                ExampleAppWidgetProvider.updateAppWidget(context, 
                       gm, appWidgetIds.get(i), texts.get(i));
            }
        }
    }

}

并有一个WifiDemo示例， click Here 。