广播接收器没有发回数据,主类 [英] BroadcastReceiver not sending back data to main class
问题描述
我使用一个BroadcastReceiver来设置一个报警alaret,由于某种原因,它不会工作。
I am using a BroadcastReceiver to set up an alarm alaret and for some reason it won't work.
public class SimpleSleepActivity extends Activity {
/** Called when the activity is first created. */
Button setAlarm, setTimer;
int hours = 1, alarmSec = 10;
Toast mToast;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setAlarm = (Button) findViewById(R.id.bSetAlarm);
setTimer = (Button) findViewById(R.id.bSetTimer);
setTimer.setOnClickListener(mAlarmFromNow);
}
private OnClickListener mAlarmFromNow = new OnClickListener() {
public void onClick(View v) {
// When the alarm goes off, broadcast an Intent to the
// BroadcastReceiver. This is an Intent with an explicit class
// name to have a receiver instantiated and called, and then
// create an IntentSender to have the intent executed as a broadcast.
Intent intent = new Intent(SimpleSleepActivity.this,
AlarmFromNow.class);
PendingIntent sender = PendingIntent.getBroadcast(
SimpleSleepActivity.this, 0, intent, 0);
// Finding the current time and setting and alarm for XX seconds
// from that time
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.add(Calendar.SECOND, alarmSec);
// Scheduling the alarm
AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
am.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), sender);
if (mToast != null) {
mToast.cancel();
}
mToast = Toast.makeText(SimpleSleepActivity.this,
//Show the user what they imputed
"The alarm will go off in " + alarmSec + " Seconds", Toast.LENGTH_LONG);
mToast.show();
}
};
}
我的其他类是这个
my other class is this
public class AlarmFromNow extends BroadcastReceiver {
public void onReceive(Context context, Intent intent) {
//Display a toast after alarmSec is counted
Toast.makeText(context, R.string.alarm_from_now, Toast.LENGTH_LONG)
.show();
}
}
当我试图让10秒就不会出现后Toast通知。我想不出任何其他原因,它不会工作,我已经看过Google的API演示和遵循它密切。
When I try to get that toast notification after 10 sec it won't appear. I can't think of any other reason that it won't work and I have looked at googles API demos and followed it closely.
推荐答案
更可能的是,你忘了给广播接收机添加到您的AndroidManifest.xml
为了能够使用它,它必须在清单中声明:
More likely, you forgot to add the BroadCast Receiver to your AndroidManifest.xml To be able to use it, it must be declared in your manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.yourpackage.name"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="9" />
<uses-permission android:name="com.android.alarm.permission.SET_ALARM"/>
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<!-- Your activity here -->
<activity android:name="SimpleSleepActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<!-- Your Receiver here -->
<receiver android:name="AlarmFromNow"></receiver>
</application>
</manifest>
请注意:我很快就测试了code,这一清单,而事实上后10秒显示吐司...
NOTE: I quickly tested your code, with this manifest, and indeed it shows the Toast after 10 secs...
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