[移动开发]Android中Activity的N种回调的调用时机

直接上代码测试：

public class MainActivity extends AppCompatActivity {

    private final static String TAG = "TAG";

    @Override
    protected void attachBaseContext(Context newBase) {
        super.attachBaseContext(newBase);

        Log.d(TAG, "attachBaseContext: ");
    }

    @Override
    public void onContentChanged() {
        super.onContentChanged();

        Log.d(TAG, "onContentChanged: ");
    }

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

        Log.d(TAG, "onCreate: ");
    }

    @Override
    protected void onPostCreate(@Nullable Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        Log.d(TAG, "onPostCreate: ");
    }

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

        Log.d(TAG, "onRestart: ");
    }

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

        Log.d(TAG, "onStart: ");
    }

    @Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);

        Log.d(TAG, "onNewIntent: ");
    }

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

        Log.d(TAG, "onPostResume: ");
    }

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

        Log.d(TAG, "onResume: ");
    }

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

        Log.d(TAG, "onPause: ");
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);

        Log.d(TAG, "onSaveInstanceState: ");

        outState.putBoolean("FLAG", true);
    }

    @Override
    protected void onRestoreInstanceState(@NonNull Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);

        boolean FLAG = savedInstanceState.getBoolean("FLAG");
        if (FLAG) {
            Log.d(TAG, "onRestoreInstanceState: " + FLAG);
        }
    }

    @Override
    protected void onStop() {
        super.onStop();
        Log.d(TAG, "onStop: ");
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.d(TAG, "onDestroy: ");
    }
}

直接运行之后，我们看看Logcat中的打印：

D/TAG: attachBaseContext:
D/TAG: onContentChanged:
D/TAG: onCreate:
D/TAG: onStart:
D/TAG: onPostCreate:
D/TAG: onResume:
D/TAG: onPostResume: 

--- 之后我们旋转屏幕，让它发生`configChanges`，在来观察：
D/TAG: onPause:
D/TAG: onSaveInstanceState:
D/TAG: onStop:
D/TAG: onDestroy:
D/TAG: attachBaseContext:
D/TAG: onContentChanged:
D/TAG: onCreate:
D/TAG: onStart:
D/TAG: onRestoreInstanceState: true
D/TAG: onPostCreate:
D/TAG: onResume:
D/TAG: onPostResume: