CODEWITHSUNDEEP
androidandroid-lifecycle
Olyalya
Olyalya

Reputation: 91

how to check activities lifecycle state in Android

I want to work on my data depending on what Lifecycle state I have.

For example, I want to do something, when the application was resumed. How can I find out in what State is my app now? Thanks for help.

Upvotes: 9

Views: 14293

Answers (3)

The incredible Jan
The incredible Jan

Reputation: 904

in activity: if (getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.RESUMED)) ... I think. If you're asking about async tasks.

Upvotes: 18

Deepak kaku
Deepak kaku

Reputation: 1278

There are predefined methods of an Activity. Please review Life cycle of an Activity in Android.

Example code

public class LifeCycleActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main); 
        Toast.makeText(LifeCycleActivity.this,"ON CREATE", Toast.LENGTH_SHORT).show(); 
    } 
    @Override
    protected void onStart() {
       // TODO Auto-generated method stub
       super.onStart(); 
        Toast.makeText(LifeCycleActivity.this,"ON START", Toast.LENGTH_SHORT).show();
    } 
    @Override
    protected void onResume() {
       // TODO Auto-generated method stub
       super.onResume(); 
        Toast.makeText(LifeCycleActivity.this,"ON RESUME", Toast.LENGTH_SHORT).show(); 
    } 
    @Override
    protected void onPause() {
       // TODO Auto-generated method stub
       super.onPause(); 
        Toast.makeText(LifeCycleActivity.this,"ON PAUSE", Toast.LENGTH_SHORT).show(); 
    } 
    @Override
    protected void onRestart() {
       // TODO Auto-generated method stub
       super.onRestart(); 
        Toast.makeText(LifeCycleActivity.this,"ON RESTART", Toast.LENGTH_SHORT).show(); 
    } 
    @Override
    protected void onStop() {
       // TODO Auto-generated method stub
       super.onStop(); 
        Toast.makeText(LifeCycleActivity.this,"ON STOP", Toast.LENGTH_SHORT).show(); 
    } 
    @Override
    protected void onDestroy() {
       // TODO Auto-generated method stub
       super.onDestroy(); 
        Toast.makeText(LifeCycleActivity.this,"ON DESTROY", Toast.LENGTH_SHORT).show();
    } 
}

Also read: - https://developer.android.com/guide/components/activities/activity-lifecycle.html

Upvotes: 0

Samuel Eminet
Samuel Eminet

Reputation: 4737

For custom class you can use lifecycle from architecture components, first add library

annotationProcessor "android.arch.lifecycle:compiler:1.1.1"

then your custom class, for example

public class MyObserver implements LifecycleObserver {
    @OnLifecycleEvent(Lifecycle.Event.ON_RESUME)
    public void connectListener() {
        ...
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE)
    public void disconnectListener() {
        ...
    }
}

and finally from your lifecycle container (activity/fragment)

myActivity.getLifecycle().addObserver(new MyObserver());

More info here https://developer.android.com/topic/libraries/architecture/lifecycle.html

Upvotes: 0

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