[SOLVED] In the android code base, where is the activity lifecycle defined?

In the android code base, where is the activity lifecycle defined?

I see this documentation under developer.android.com, describing the Activity lifecycle. However, I am trying to match the description up with the actual android code, at cs.android.com, where the activity life cycle is actually defined.

Looking there in code search at Activity.java, I see, for example, the onCreate method defined. But I have not been able to find where this is actually called as part of the lifecycle. Maybe it is listed when I search for its references, but there are thousands of references, including a lot of overrides, and I have not found where it is called defining its place in the activity life cycle.

Where might I find that?

Solution

Copy the below code to your main activity and run it while opening the logcat .The log massage will show you which method within the activity cycle has been called .

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Log.v("MainActivity", "Oncreat");
}

@Override
protected void onStart() {
    super.onStart();
    Log.v("MainActivity", "onStart");
}

@Override
protected void onResume() {
    super.onResume();
    Log.v("MainActivity", "onResume");
}

@Override
protected void onPause() {
    super.onPause();
    Log.v("MainActivity", "onPause");
}

@Override
protected void onStop() {
    super.onStop();
    Log.v("MainActivity", "onStop");
}

@Override
protected void onRestart() {
    super.onRestart();

    Log.v("MainActivity", "OnRestart");

}

@Override
protected void onDestroy() {
    super.onDestroy();
    Log.v("MainActivity", "onDestroy");
}

You can also check this link for more details .