Android学习笔记（Android Studio） 4-1-2 Activity的生命周期（不可不会的Activity和Fragment）

Android学习笔记4-1-2

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4-1-1 Activity的生命周期

• LifeCycleActivity.java

    package com.ylw.helloworld;
    
    import android.os.Bundle;
    import android.util.Log;
    
    import androidx.annotation.Nullable;
    import androidx.appcompat.app.AppCompatActivity;
    
    public class LifeCycleActivity extends AppCompatActivity {
        @Override
        protected void onCreate(@Nullable Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_test);
            Log.d("LifeCycle","----onCreate----");
        }
    
        @Override
        protected void onStart() {
            super.onStart();
            Log.d("LifeCycle","----onStart----");
        }
    
        @Override
        protected void onResume() {
            //可以用于数据的刷新
            super.onResume();
            Log.d("LifeCycle","----onResume----");
        }
    
        @Override
        protected void onPause() {
            //当你离开当前应用去别的应用时会调用此方法暂停
            super.onPause();
            Log.d("LifeCycle","----onPause----");
        }
    
        //当程序被切入后台时会调用onPause和onStop
    
        @Override
        protected void onStop() {
            super.onStop();
            Log.d("LifeCycle","----onStop----");
        }
    
        @Override
        protected void onDestroy() {
            super.onDestroy();
            Log.d("LifeCycle","----onDestroy----");
        }
    
        @Override
        protected void onRestart() {
            super.onRestart();
            Log.d("LifeCycle","----onRestart----");
        }
    }