[移动开发]Activity的生命周期

新建两个简单的activity?

ActivityFirst   

public class ActivityFirst extends AppCompatActivity {
    ActivityFirstBinding binding;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        ActivityUtil.printLog("ActivityFirst onCreate");

        super.onCreate(savedInstanceState);
        binding = ActivityFirstBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());
        binding.second.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setClass(ActivityFirst.this, ActivitySecond.class);
                startActivity(intent);
            }
        });

    }

    @Override
    protected void onStart() {
        ActivityUtil.printLog("ActivityFirst onStart");
        super.onStart();
    }

    @Override
    protected void onStop() {
        ActivityUtil.printLog("ActivityFirst onStop");

        super.onStop();
    }

    @Override
    protected void onDestroy() {
        ActivityUtil.printLog("ActivityFirst onDestroy");

        super.onDestroy();
    }

    @Override
    protected void onPause() {
        ActivityUtil.printLog("ActivityFirst onPause");

        super.onPause();
    }

    @Override
    protected void onNewIntent(Intent intent) {
        ActivityUtil.printLog("ActivityFirst onNewIntent");

        super.onNewIntent(intent);
    }

    @Override
    protected void onResume() {
        ActivityUtil.printLog("ActivityFirst onResume");

        super.onResume();
    }

    @Override
    protected void onSaveInstanceState(@NonNull Bundle outState) {
        ActivityUtil.printLog("ActivityFirst onSaveInstanceState");

        super.onSaveInstanceState(outState);
    }

    @Override
    protected void onRestoreInstanceState(@NonNull Bundle savedInstanceState) {
        ActivityUtil.printLog("ActivityFirst onSaveInstanceState");

        super.onRestoreInstanceState(savedInstanceState);
    }
}

ActivitySecond

public class ActivitySecond extends AppCompatActivity {
    ActivitySecondBinding binding;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        ActivityUtil.printLog("ActivitySecond onCreate");
        super.onCreate(savedInstanceState);
        binding = ActivitySecondBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());
        binding.first.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setClass(ActivitySecond.this, ActivityFirst.class);
                startActivity(intent);
            }
        });
    }

    @Override
    protected void onStart() {
        ActivityUtil.printLog("ActivitySecond onStart");
        super.onStart();
    }

    @Override
    protected void onStop() {
        ActivityUtil.printLog("ActivitySecond onStop");

        super.onStop();
    }

    @Override
    protected void onDestroy() {
        ActivityUtil.printLog("ActivitySecond onDestroy");

        super.onDestroy();
    }

    @Override
    protected void onPause() {
        ActivityUtil.printLog("ActivitySecond onPause");

        super.onPause();
    }

    @Override
    protected void onNewIntent(Intent intent) {
        ActivityUtil.printLog("ActivitySecond onNewIntent");

        super.onNewIntent(intent);
    }

    @Override
    protected void onResume() {
        ActivityUtil.printLog("ActivitySecond onResume");

        super.onResume();
    }

    @Override
    protected void onSaveInstanceState(@NonNull Bundle outState) {
        ActivityUtil.printLog("ActivitySecond onSaveInstanceState");

        super.onSaveInstanceState(outState);
    }

    @Override
    protected void onRestoreInstanceState(@NonNull Bundle savedInstanceState) {
        ActivityUtil.printLog("ActivitySecond onSaveInstanceState");

        super.onRestoreInstanceState(savedInstanceState);
    }
}

First启动Second后的执行顺序

ActivityFirst onPause
ActivitySecond onCreate
ActivitySecond onStart
ActivitySecond onResume
ActivityFirst onStop
ActivityFirst onSaveInstanceState

Second返回First的顺序

Second旋转的执行顺序

Second旋转后返回First的执行顺序

Second设置为singleTask

android:launchMode="singleTask"

Second->First->Second

singleTask