最近对Android开发很感兴趣,朋友给了我一本书《Android Application Development for Dummies》。在书中,有一个名为 Silent Toggle Mode 的示例应用程序。稍后它会教您为应用程序制作主屏幕小部件。我已经准确地输入了书中的所有内容,但它仍然给我一个错误,通知我永远不会调用 onReceive() 方法。这是代码:
package com.example.myapplication;
import android.app.Activity;
import android.app.IntentService;
import android.app.PendingIntent;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.media.AudioManager;
import android.widget.RemoteViews;
public class AppWidget extends AppWidgetProvider {
@Override
public void onRecieve(Context context, Intent intent) {
if(intent.getAction()==null) {
context.startService(new Intent(context, ToggleService.class));
} else {
super.onReceive(context, intent);
}
}
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
context.startService(new Intent(context, ToggleService.class));
}
public static class ToggleService extends IntentService {
public ToggleService() {
super("AppWidget$ToggleService");
}
@Override
protected void onHandleIntent(Intent intent) {
ComponentName me=new ComponentName(this, AppWidget.class);
AppWidgetManager mgr=AppWidgetManager.getInstance(this);
mgr.updateAppWidget(me, buildUpdate(this));
}
private RemoteViews buildUpdate(Context context) {
RemoteViews updateViews=new RemoteViews(context.getPackageName(),R.layout.widget);
AudioManager audioManager=(AudioManager)context.getSystemService(Activity.AUDIO_SERVICE);
if(audioManager.getRingerMode()==AudioManager.RINGER_MODE_SILENT) {
updateViews.setImageViewResource(R.id.phoneState,R.drawable.phone_state_normal);
audioManager.setRingerMode(AudioManager.RINGER_MODE_SILENT);
} else {
updateViews.setImageViewResource(R.id.phoneState,R.drawable.phone_state_silent);
audioManager.setRingerMode(AudioManager.RINGER_MODE_NORMAL);
}
Intent i=new Intent(this, AppWidget.class);
PendingIntent pi=PendingIntent.getBroadcast(context, 0, i, 0);
updateViews.setOnClickPendingIntent(R.id.phoneState, pi);
return updateViews;
}
}
}