Why App widget stops working after restarting laucher?

Question

Chosen answer in duplicate is WRONG.

It will produce NPE if the widget app restarts.

——————————

It is a TorchWidget app, contains 2 classes:

class1 AppWidgetProvider

setOnClickPendingIntent to start class2
new RemoteViews to set initial button icon.

class2 IntentService

switch torch

new another RemoteViews to switch on/off icon.

RemoteViews views = new RemoteViews(getPackageName(), R.layout.torch);

if (b) {
    mSwitch(Service.this, false);
    views.setImageViewResource(R.id.Torch,R.drawable.moon_off );
    editor.putBoolean("switch", false);
} else {
    mSwitch(Service.this, true);
    views.setImageViewResource(R.id.Torch,R.drawable.moon_on );
    editor.putBoolean("switch", true);
}

Full Code on Github.

userA789 · Accepted Answer · 2018-03-20T00:17:42.100

0

After restart, the restored view will be the one instantiated in IntentService, which is without OnClickPendingIntent.

To solve the problem, I should change icon only in update function in provider via broadcasts.

still a question, why the OnClickPendingIntent will work until launcher restart, after view is replaced.

edited Mar 20 '18 at 00:17

answered Mar 19 '18 at 10:26

userA789

425
2
6
17

Stop editing the Question/Answer, your edits deviates from the original intent of the post. Even edits that must make drastic changes should strive to preserve the goals of the post's owner. – Vishal Chhodwani Mar 27 '18 at 06:03
@VishalChhodwani man I'm the owner, what are you talking about. – userA789 Mar 27 '18 at 06:39
I am not talking about this answer(it is just to notify you), talking about last edit. – Vishal Chhodwani Mar 27 '18 at 06:40

Why App widget stops working after restarting laucher?

1 Answers1