Application crashes when running in a device that has lower version of the OS

Question

My application works perfectly when running in Android 8.0.0 device. But app crash when using in Àndroid 6.0.1. I checked error log, crash cause because of AlertDialog,

AlertDialog.Builder builder = new AlertDialog.Builder(context, R.style.MyAlertDialogStyle);
        builder.setMessage("Would you like to enable it?")
                .setTitle("No Internet Connection")
                .setPositiveButton(" Enable Internet ", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        Intent dialogIntent = new Intent(android.provider.Settings.ACTION_SETTINGS);
                        dialogIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                        context.startActivity(dialogIntent);
                    }
                });

        alert = builder.create();
        alert.setCancelable(false);
        alert.show();

MyAlertDialogStyle is,

<style name="MyAlertDialogStyle" parent="Theme.AppCompat.Light.Dialog.Alert">
    <item name="colorAccent">#FFC107</item>
    <item name="android:textColorPrimary">#FFFFFF</item>
    <item name="android:background">#4CAF50</item>
</style>

Error is,

E/AndroidRuntime: FATAL EXCEPTION: main
Process: my.app.com, PID: 22952                                           java.lang.RuntimeException: Unable to start receiver my.app.com.receivers.NetworkChangeReceiver: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
 at android.app.ActivityThread.handleReceiver(ActivityThread.java:3641)
 at android.app.ActivityThread.access$2000(ActivityThread.java:221)
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1876)
 at android.os.Handler.dispatchMessage(Handler.java:102)
 at android.os.Looper.loop(Looper.java:158)
 at android.app.ActivityThread.main(ActivityThread.java:7224)
 at java.lang.reflect.Method.invoke(Native Method)
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
 at android.view.ViewRootImpl.setView(ViewRootImpl.java:853)
 at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:337)
 at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
 at android.app.Dialog.show(Dialog.java:350)
 at my.app.com.preferences.GlobalModel.displayLoadingAlert(Global.java:130)
 at my.app.com.receivers.NetworkChangeReceiver.onReceive(NetworkChangeReceiver.java:27)
 at android.app.ActivityThread.handleReceiver(ActivityThread.java:3634)
 at android.app.ActivityThread.access$2000(ActivityThread.java:221) 
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1876) 
 at android.os.Handler.dispatchMessage(Handler.java:102) 
 at android.os.Looper.loop(Looper.java:158) 
 at android.app.ActivityThread.main(ActivityThread.java:7224) 
 at java.lang.reflect.Method.invoke(Native Method) 
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

Please help me to fix this issue, and make sure my application works in all versions of android. Thanks in advance.

Is this alert being launched from an Activity, Fragment, or Service? — dazza5000, Jan 25 '18 at 16:11
@dazza5000 from BroadcastReceiver, if (!isOnline) it display — Kavin-K, Jan 25 '18 at 16:17
Then you need to use BroadcastReceiver.this - I think the issue is that you are not using a valid context. To show an alert dialog from a broadcast receiver you might also need the system alert permission. — dazza5000, Jan 25 '18 at 16:45
@dazza5000 that class extends `BroadcastReceiver` not `Activty` — Kavin-K, Jan 26 '18 at 04:49

score -2 · Answer 1 · answered Jan 25 '18 at 16:10

-2

Try using YourActivity.this instead of context. Source

answered Jan 25 '18 at 16:10

Prajjwal Srivastav

187
2
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Application crashes when running in a device that has lower version of the OS

1 Answers1