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Code Issues Releases Wiki Activity

Implement the hack from stackoverflow to detect if the task is really in

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the background even though it's in Activity.onResume() (works around
Android 9 bug).
This commit is contained in:
Greg Alexander 2019-09-22 15:59:04 -04:00
parent 01b3a65a05
commit a2aa4a2d1c
1 changed files with 28 additions and 3 deletions
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31
app/src/main/java/org/galexander/sshd/SimpleSSHDService.java
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@ -1,6 +1,7 @@
package org.galexander.sshd; package org.galexander.sshd;
import android.app.Activity; import android.app.Activity;
import android.app.ActivityManager;
import android.app.Notification; import android.app.Notification;
import android.app.NotificationChannel; import android.app.NotificationChannel;
import android.app.NotificationManager; import android.app.NotificationManager;
@ -16,6 +17,7 @@ import androidx.core.app.NotificationCompat;
import java.io.BufferedReader; import java.io.BufferedReader;
import java.io.File; import java.io.File;
import java.io.FileReader; import java.io.FileReader;
import java.util.List;
public class SimpleSSHDService extends Service { public class SimpleSSHDService extends Service {
/* if restarting twice within 10 seconds, give up */ /* if restarting twice within 10 seconds, give up */
@ -222,15 +224,38 @@ public class SimpleSSHDService extends Service {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
if (Prefs.get_foreground()) { if (Prefs.get_foreground()) {
ctx.startForegroundService(i); ctx.startForegroundService(i);
} else if (ctx instanceof Activity) { } else if (!(ctx instanceof Activity)) {
ctx.startService(i);
} else {
Toast.makeText(ctx, Toast.makeText(ctx,
"SimpleSSHD cannot start in background since Oreo (enable Settings -> Foreground Service).", "SimpleSSHD cannot start in background since Oreo (enable Settings -> Foreground Service).",
Toast.LENGTH_LONG).show(); Toast.LENGTH_LONG).show();
} else if (is_foreground_app(ctx)) {
ctx.startService(i);
} else {
/* The OS put us in SimpleSSHD.onResume() even
* though it's not ready to put an app activity
* in the foreground yet! Just give up. Maybe
* the OS will try again? */
} }
} else { } else {
ctx.startService(i); ctx.startService(i);
} }
} }
/* There's a bug in Android 9 Pie (SDK 28) where onResume() is called
* during wake-up when the OS isn't ready to put the app in the
* foreground, so startService() fails. This should detect that state.
* This code is copy-pasted from stackoverflow, and initially comes from
* a Google bug report on the issue? */
public static boolean is_foreground_app(Context ctx) {
ActivityManager am = (ActivityManager)ctx.getSystemService(
Context.ACTIVITY_SERVICE);
List<ActivityManager.RunningAppProcessInfo> procs =
am.getRunningAppProcesses();
if (procs == null) {
return false;
}
// higher importance has lower number (?)
return (procs.get(0).importance <=
ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND);
}
} }