我试图触发我的通知底部。我按照这个示例代码 http://www.compiletimeerror.com/2013/10/status-bar-notification-example-in.html#.VWtoS1xViko
当我从我的HomeActivity调用该方法时，我可以触发通知，这是我应用程序的主要活动。当尝试从应用程序中的一个方法调用时，没有任何反应。 （例如）
HomeActivity homeactivity = new HomeActivity();
homeactivity.Notify("Title: ...", "Msg: ... ");
以下是该活动的日志。按下5个按钮后触发警报
05-31 18:33:41.533 10118-10118/com.myapp.md E/>>>>>>﹕ MultiClickEvent clickCount = 5
05-31 18:33:41.543 10118-10118/com.myapp.md E/>>>>>>>﹕ in onActivation of HWReceiver
05-31 18:33:41.603 10118-10118/com.myapp.md V/Vibrator﹕ Called vibrate(long) API - PUID: 10588, PackageName: com.myapp.md
05-31 18:33:41.603 10118-10118/com.myapp.md V/Vibrator﹕ vibrate - PUID: 10588, PackageName: com.myapp.md, ms: 3000, mag: -1
05-31 18:33:41.643 10118-10118/com.myapp.md D/AbsListView﹕ onVisibilityChanged() is called, visibility : 4
05-31 18:33:41.643 10118-10118/com.myapp.md D/AbsListView﹕ unregisterIRListener() is called
05-31 18:33:41.643 10118-10118/com.myapp.md D/AbsListView﹕ onVisibilityChanged() is called, visibility : 4
05-31 18:33:41.643 10118-10118/com.myapp.md D/AbsListView﹕ unregisterIRListener() is called
05-31 18:33:41.643 10118-11068/com.myapp.md E/>>>>>>﹕ in CurrentLocationProvider CONSTRUCTOR - trying to retrieve location from getLastKnownLocation()
05-31 18:33:41.833 10118-11068/com.myapp.md I/com.myapp.md.alert.SMSAdapter﹕ Sms sent: I need IMMEDIATE help! - I'm here https://maps.google.com/maps?q=40.7348922,-73.977548 via network
05-31 18:33:44.883 10118-10118/com.myapp.md E/>>>>>>>﹕ in onReceive of HWReceiver
05-31 18:33:44.883 10118-10118/com.myapp.md E/>>>>>>>﹕ in onReceive of HWReceiver context com.myapp.md.trigger.HardwareTriggerService@429b89b0
05-31 18:33:44.883 10118-10118/com.myapp.md E/>>>>>>>﹕ in onReceive of HWReceiver intent Intent { act=android.intent.action.SCREEN_ON flg=0x50000010 }
我尝试将通知放入我的SMSAdapter
public class SMSAdapter {
private static final String LOG_TAG = SMSAdapter.class.getName();
public void sendSMS(Context context, String phoneNumber, String message) {
// Log.e("20140411", "sending fake SMS -> " + message);
if(!ApplicationSettings.isFirstMsgSent(context)){
ApplicationSettings.setFirstMsgSent(context, true);
}
SmsManager smsManager = getSmsManager();
try {
smsManager.sendTextMessage(phoneNumber, null, message, null, null);
Log.i(LOG_TAG, "Sms sent: " + message);
HomeActivity homeactivity = new HomeActivity();
homeactivity.Notify("Title: Text SOS",
"Msg: Alerting your emergency contacts ");
} catch (Exception exception) {
Log.e(LOG_TAG, "Sending SMS failed " + exception.getMessage());
}
}
SmsManager getSmsManager() {
return SmsManager.getDefault();
}
}
当我这样做时，我收到此消息
05-31 18:39:33.163 18640-19982/com.textsosalert.md E/>>>>>>﹕ in CurrentLocationProvider CONSTRUCTOR - trying to retrieve location from getLastKnownLocation()
05-31 18:39:33.383 18640-19982/com.textsosalert.md I/com.textsosalert.md.alert.SMSAdapter﹕ Sms sent: I need IMMEDIATE help! - I'm here https://maps.google.com/maps?q=40.7348689,-73.9775756 via network
05-31 18:39:33.383 18640-19982/com.textsosalert.md E/com.textsosalert.md.alert.SMSAdapter﹕ Sending SMS failed Can't create handler inside thread that has not called Looper.prepare()
这是我定义的Notify方法：
@SuppressWarnings("deprecation")
public void Notify(String notificationTitle, String notificationMessage) {
NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
@SuppressWarnings("deprecation")
Notification notification = new Notification(R.drawable.icon_sos,
"New Message", System.currentTimeMillis());
Intent notificationIntent = new Intent(this, HomeActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0,
notificationIntent, 0);
notification.setLatestEventInfo(HomeActivity.this, notificationTitle,
notificationMessage, pendingIntent);
notificationManager.notify(9999, notification);
}
答案 0 :(得分：1)
问题在于您正在调用new HomeActivity()，这是您永远不应该做的事情。 Android中的活动始终使用startActivity()或startActivityForResult()启动，绝不应使用new明确创建。
当您调用new HomeActivity()时，不会调用任何Activity生命周期回调，因此Activity将没有有效的Context。
所以，这只是不起作用：
HomeActivity homeactivity = new HomeActivity();
homeactivity.Notify("Title: ...", "Msg: ... ");
如果您想拥有一个可以在代码中的不同位置重用的方法，请将其放在单独的类中，并让该方法将Context作为参数。
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
public class MyNotification {
@SuppressWarnings("deprecation")
public static void notify(Context context, String notificationTitle, String notificationMessage) {
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
@SuppressWarnings("deprecation")
Notification notification = new Notification(R.drawable.icon_sos,
"New Message", System.currentTimeMillis());
Intent notificationIntent = new Intent(context, HomeActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0,
notificationIntent, 0);
notification.setLatestEventInfo(context, notificationTitle,
notificationMessage, pendingIntent);
notificationManager.notify(9999, notification);
}
}
然后在SMSAdapter中，您将拥有：
try {
smsManager.sendTextMessage(phoneNumber, null, message, null, null);
Log.i(LOG_TAG, "Sms sent: " + message);
/* Don't do this:
HomeActivity homeactivity = new HomeActivity();
homeactivity.Notify("Title: Text SOS",
"Msg: Alerting your emergency contacts ");
*/
//Do this instead:
MyNotification.notify(context, "Title: Text SOS",
"Msg: Alerting your emergency contacts ");
} catch (Exception exception) {
Log.e(LOG_TAG, "Sending SMS failed " + exception.getMessage());
}
另请注意，您可以使用this作为context从HomeActivity中调用此内容：
MyNotification.notify(this, "Title: Text SOS",
"Msg: Alerting your emergency contacts ");