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Android app lifecycle

The Android app lifecycle refers to the different states that an Android app can be in during its execution, from its creation to its destruction. Understanding the app lifecycle is essential for developing robust and efficient Android applications. The following are the various stages of the Android app lifecycle:

  • onCreate(): This method is called when the app is first created. It is used for initializing the app and setting up its user interface.

Example code:

java
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public class MainActivity extends AppCompatActivity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        // Initialize variables and set up UI elements
        // ...
    }
}
  • onStart(): This method is called when the app becomes visible to the user, but before it is ready to be interacted with.

Example code:

java
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@Override
protected void onStart() {
    super.onStart();
    // Connect to data sources and initialize other resources
    // ...
}
  • onResume(): This method is called when the app becomes active and ready to receive user input.

Example code:

java
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@Override
protected void onResume() {
    super.onResume();
    // Resume data updates, restart animations, and other user interactions
    // ...
}
  • onPause(): This method is called when the app loses focus or when another app takes over the screen.

Example code:

java
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@Override
protected void onPause() {
    super.onPause();
    // Pause data updates, animations, and other user interactions
    // ...
}
  • onStop(): This method is called when the app is no longer visible to the user.

Example code:

java
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@Override
protected void onStop() {
    super.onStop();
    // Release resources and stop background tasks
    // ...
}
  • onDestroy(): This method is called when the app is about to be destroyed and removed from memory.

Example code:

java
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@Override
protected void onDestroy() {
    super.onDestroy();
    // Clean up resources and release memory
    // ...
}

By understanding the Android app lifecycle, developers can optimize their apps for performance and minimize the use of system resources.



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