Android生命周期，点击home键和返回键时的顺序以及MENU菜单键简单测试

来源：互联网发布：知堂回想录 pdf 微盘编辑：程序博客网时间：2024/05/16 13:55

当一个程序执行的时候，启动的方法有

onCreate，onStart，onResume

当点击返回键时的全部顺序为：

onCreate，onStart，onResume，点击返回键，onPause，onStop，onDestroy

再次启动程序时为点击返回键顺序为：

onCreate，onStart，onResume，点击返回键，onPause，onStop，onDestroy

当点击HOME键时的全部顺序为：

onCreate，onStart，onResume，点击HOME键，onPause，onStop

再次启动程序时为点击HOME键顺序为：

onRestart，onStart，onResume，点击HOME键，onPause，onStop

可以看出来，点击HOME键只是讲程序腿到后台，点击返回键是退出程序

点击自己实现菜单键运行顺序为同点击返回键效果一样

下面是源代码

package com.xiaoke.menuhome;import android.os.Bundle;import android.app.Activity;import android.util.Log;import android.view.Menu;import android.view.MenuItem;public class MainActivity extends Activity {private static final String TGA = "MainActivity";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Log.d(TGA, "onCreate");}//开始创建菜单栏里面的内容@Overridepublic boolean onCreateOptionsMenu(Menu menu) {getMenuInflater().inflate(R.menu.main, menu);//添加选项第二个数字为ItemIdmenu.add(0, 1, 1, "退出");menu.add(0, 2, 2, "关于");return true;}//点击MENU菜单键时调用该函数，通关Id找到对应的选项@Overridepublic boolean onOptionsItemSelected(MenuItem item) {if (item.getItemId() == 1) {finish();}return super.onOptionsItemSelected(item);}@Overrideprotected void onStart() {// TODO Auto-generated method stubsuper.onStart();Log.d(TGA, "AonStart");}@Overrideprotected void onRestart() {// TODO Auto-generated method stubsuper.onRestart();Log.d(TGA, "AonRestart");}@Overrideprotected void onResume() {// TODO Auto-generated method stubsuper.onResume();Log.d(TGA, "AonResume");}@Overrideprotected void onPause() {// TODO Auto-generated method stubsuper.onPause();Log.d(TGA, "AonPause");}@Overrideprotected void onStop() {// TODO Auto-generated method stubsuper.onStop();Log.d(TGA, "AonStop");}@Overrideprotected void onDestroy() {// TODO Auto-generated method stubsuper.onDestroy();Log.d(TGA, "AonDestroy");}}

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