Question

In my app, the activity starts a thread which download images from server. There are more than 30 images. While downloading, the user can switch to another activity. So I want that the thread should stop doing whatever it is doing. I have used mThread.interrupt() method in onDestroy(), but it did not worked. How to do that?

Answer 1

I can suggest simpler&safer approach to handle this

Use common value across your app;
SharedPreferences or inside Application context
Key=IsStopDownload
Value= True / False

part.1)
in Application context (MyApplication)

private boolean isAppActive = false;
public void setAppState(Context context, boolean state) {
    isAppActive = state;
    // note: you can also store this in SharedPreferences
}
public boolean getAppState(Context context) {
    return isAppActive;
    // note: you can also load this from SharedPreferences
}

part.2)
Activity onResume and onPause are the guaranteed places to identify state of your activity.

onResume -> activity is active
onPause -> activity is not active

part.3)
let your thread check the activity state and if not active, it can stop itself, thats safer then making external interrupt. threads can act weird when interrupted from outside, it is safer to break the loop from inside.

e.g.

((MyApplication)context.getApplicationContext()).getAppState(context);

if thats false, thread stops itself

hope this helps…

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