当我在onCreate（）中调用startActivity（）时，是否执行了其他生命周期方法

Question

当我调用startActivity（）方法来启动onCreate（）方法的其他活动时;

是否执行了其他lifecircle方法，例如onStart（）或onResume（）

我有一个测试

    AppMain.java

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

            Log.i(TAG, "onCreate");
            startActivity(new Intent(AppMain.this,AppOther.class));
        }


        @Override
        protected void onRestart() {
            Log.i(TAG, "onRestart");
            super.onRestart();
        }

        @Override
        protected void onStart() {
            Log.i(TAG, "onStart");
            super.onStart();
        }

        @Override
        protected void onRestoreInstanceState(Bundle savedInstanceState) {
            Log.i(TAG, "onRestoreInstanceState");
            super.onRestoreInstanceState(savedInstanceState);
        }

        @Override
        protected void onResume() {
            Log.i(TAG, "onResume");
            super.onResume();
        }


        @Override
        protected void onPause() {
            Log.i(TAG, "onPause");
            super.onPause();
        }

        @Override
        protected void onSaveInstanceState(Bundle outState) {
            Log.i(TAG, "onSaveInstanceState");
            super.onSaveInstanceState(outState);
        }

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



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


        @Override
        public void onConfigurationChanged(Configuration newConfig) {
            Log.i(TAG, "onConfigurationChanged");
            super.onConfigurationChanged(newConfig);
        }

    AppOther.java

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

        Log.i(TAG, "onCreate");

    }

    @Override
    protected void onRestart() {
        Log.i(TAG, "onRestart");
        super.onRestart();
    }

    @Override
    protected void onStart() {
        Log.i(TAG, "onStart");
        super.onStart();
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        Log.i(TAG, "onRestoreInstanceState");
        super.onRestoreInstanceState(savedInstanceState);
    }

    @Override
    protected void onResume() {
        Log.i(TAG, "onResume");

        super.onResume();
    }


    @Override
    protected void onPause() {
        Log.i(TAG, "onPause");

        super.onPause();
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        Log.i(TAG, "onSaveInstanceState");
        super.onSaveInstanceState(outState);
    }

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



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


    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        Log.i(TAG, "onConfigurationChanged");
        super.onConfigurationChanged(newConfig);
    }

logcat的：

05-29 05:28:11.583: I/AppMain(1257): onCreate
05-29 05:28:11.614: I/AppMain(1257): onStart
05-29 05:28:11.614: I/AppMain(1257): onResume
05-29 05:28:11.643: I/AppMain(1257): onSaveInstanceState
05-29 05:28:11.643: I/AppMain(1257): onPause
05-29 05:28:11.793: I/AppOther(1257): onCreate
05-29 05:28:11.793: I/AppOther(1257): onStart
05-29 05:28:11.793: I/AppOther(1257): onResume
05-29 05:28:12.383: I/AppMain(1257): onStop

我不知道为什么onStart（）和onResume（）方法仍然可以执行; 似乎startActivity（）没有打破AppMain的生命周期

Answer 1

语言苍白​​，用代码说话。 试试吧。

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Log.v(this.getClass().toString(),"onCreate");
    //start other Activity
    this.startActivity(new Intent(this,OtherActivity.class));
}

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

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

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

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

}

logcat显示：

Answer 2

问题的方式太窄但如果你开始另一项活动，当前活动将切换onPause（）。如果您完成了被调用的活动，则前一个活动将切换onResume（）。简而言之，如果你开始另一个活动，它将不会调用当前活动的onResume（）和onStart（）。