android - Check whether activity is active

Android - Check whether activity is active

To check whether an Android activity is active or not, you can use the isFinishing() and isDestroyed() methods. Here's a common approach:

Example

You can create a method in your activity to check if it is active:

public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public boolean isActive() { return !isFinishing() && !isDestroyed(); } }

Usage

You can call isActive() from anywhere within your activity to check if it is currently active:

if (isActive()) { // Activity is active, perform your actions } else { // Activity is not active }

Explanation

  • isFinishing(): Returns true if the activity is in the process of finishing.
  • isDestroyed(): Returns true if the activity has been destroyed.

Summary

This method provides a straightforward way to check if your activity is active before performing actions that require it to be in a valid state.

Examples

  1. How to check if an Activity is currently visible and active in Android?

    • Description: This query seeks methods to determine if an Activity is currently in the foreground and visible to the user.
    • Code:
      public boolean isActivityVisible(Activity activity) { if (activity == null) { return false; } return !activity.isFinishing() && !activity.isDestroyed(); }

  2. Android example to detect if an Activity is running or paused?

    • Description: This query looks for an example implementation to detect whether an Activity is running or paused.
    • Code:
      public boolean isActivityRunning(Activity activity) { if (activity == null) { return false; } return !activity.isFinishing() && !activity.isDestroyed() && !activity.isChangingConfigurations(); }

  3. How to check if a specific Activity is currently in the foreground?

    • Description: This query asks for methods to specifically check if a particular Activity is currently active and visible.
    • Code:
      public boolean isSpecificActivityVisible(Activity activity, Class<? extends Activity> activityClass) { if (activity == null) { return false; } return activity.getClass().equals(activityClass) && !activity.isFinishing() && !activity.isDestroyed(); }

  4. Android code to monitor the lifecycle state of an Activity?

    • Description: This query seeks code examples to monitor and log the lifecycle state changes of an Activity.
    • Code:
      @Override protected void onResume() { super.onResume(); Log.d("ActivityLifecycle", "onResume called"); } @Override protected void onPause() { super.onPause(); Log.d("ActivityLifecycle", "onPause called"); }

  5. How to determine if an Activity is in the background in Android?

    • Description: This query asks for methods to determine if an Activity is currently in the background (not visible to the user).
    • Code:
      public boolean isActivityInBackground(Activity activity) { if (activity == null) { return true; // Considered background if activity is null } return activity.isFinishing() || activity.isDestroyed() || activity.isChangingConfigurations(); }

  6. Android example to check if the application is in the foreground?

    • Description: This query seeks examples to determine if any part of the application, including its Activities, is in the foreground.
    • Code:
      public boolean isApplicationInForeground(Context context) { ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE); List<ActivityManager.RunningAppProcessInfo> processes = activityManager.getRunningAppProcesses(); if (processes == null) { return false; } for (ActivityManager.RunningAppProcessInfo process : processes) { if (process.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) { return true; } } return false; }

  7. How to detect if the current Activity has been destroyed in Android?

    • Description: This query asks for methods to detect if the current Activity instance has been destroyed.
    • Code:
      public boolean isActivityDestroyed(Activity activity) { if (activity == null) { return true; // Considered destroyed if activity is null } return activity.isDestroyed(); }

  8. Android code to check if the current Activity is finishing?

    • Description: This query seeks code examples to determine if the current Activity instance is in the process of finishing.
    • Code:
      public boolean isActivityFinishing(Activity activity) { if (activity == null) { return true; // Considered finishing if activity is null } return activity.isFinishing(); }

  9. How to check if an Activity is visible and in the foreground using lifecycle callbacks?

    • Description: This query asks for guidance on using Android lifecycle callbacks to determine if an Activity is visible and in the foreground.
    • Code:
      @Override protected void onStart() { super.onStart(); Log.d("ActivityLifecycle", "onStart called"); } @Override protected void onStop() { super.onStop(); Log.d("ActivityLifecycle", "onStop called"); }

  10. Android example to check if the current Activity is paused?

    • Description: This query seeks an example of code to check if the current Activity instance is paused.
    • Code:
      public boolean isActivityPaused(Activity activity) { if (activity == null) { return true; // Considered paused if activity is null } return activity.isChangingConfigurations() || activity.isFinishing(); }

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