public class MainActivity extends Activity {
  
  // onCreate系统自动初始化
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Log.i("--MainActivity--","--------onCreate- 系统自动初始化---------");
  }
  
  //从stop转为激活状态时执行
  @Override
  protected void onRestart() {
    super.onRestart();
    Log.i("--MainActivity--", "------onRestart--stop转为激活状态时执行----");
  }
    
  //Activity开始加载事件时执行(新创建时,或者重新启动的时候执行！)
  @Override
  protected void onStart() {
    super.onStart();
    Log.i("--MainActivity--", "--------onStart---开始加载事件时执行-----");
  }
  
  //Activity恢复到激活状态时执行（任何一次进入激活状态都将执行）
  @Override
  protected void onResume() {
    super.onResume();
    Log.i("--MainActivity--", "----------onResume-恢复到激活状态时执行-------------");
  }
  
  //Activity 被覆盖的时候执行
  @Override
  protected void onStop() {
    super.onStop();
    Log.i("--MainActivity--", "-------onStop ----被覆盖的时候执行-----------");
  }
  
  //Activity 退出或者被回收时执行,仅执行一次
  @Override
  protected void onDestroy() {
    super.onDestroy();
    Log.i("--MainActivity--","---------onDestroy---退出或者被回收时执行，仅执行一次--------------");
  }

}

 package com.example.activityvalue;

import java.util.ArrayList;

import com.example.activitylife.R;
import com.example.activityvalue.Second_OneActivity;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;

public class SecondActivity extends Activity{

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //声明Activity
    setContentView(R.layout.activity_second);
  }
  
  //传递一个普通值到一个窗体
  public void MytestOne(View view){
    System.out.println("=================传递一个普通值到一个窗体=====================");
    Intent intent = new Intent(this,Second_OneActivity.class);
    //窗体传值
    intent.putExtra("stuName","习大大");
    intent.putExtra("stuage",20);
    intent.putExtra("isMerry",false);
    //设置数组
    intent.putExtra("stuHobby",new String[]{"篮球","羽毛球","足球"});
    //设置集合数值
    ArrayList<String> list = new ArrayList<String>();
    list.add("北京");
    list.add("广东");
    list.add("美国");
    //设置数值到Intent 中
    intent.putStringArrayListExtra("stuCitys",list);
    //开启Activity
    startActivity(intent);
  }
  
}

package com.example.activiyvalue;

import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Arrays;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class Second_OneActivity extends Activity{
  
  private TextView showText;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    
    //声明一个布局文件
    setContentView(R.layout.activity_second_one);
    
    //从Intent 中取出传递过来的数据
    Intent intent = getIntent();
    
    //取出普通数据
    String name = intent.getStringExtra("stuName");
    int age = intent.getIntExtra("stuAge", 0);
    boolean isMerry = intent.getBooleanExtra("isMerry",false);
    
    //取出数组数据
    String[] hobbys = intent.getStringArrayExtra("stuHobby");
    String hobby = Arrays.toString(hobbys);
    
    //取出ArrayList 集合数据
    ArrayList<String> citys =intent.getStringArrayListExtra("stuCitys");
    String city = Arrays.toString(citys.toArray());
    
    //声明Activity
    showText = (TextView) findViewById(R.id.showText);
    
    //在Activity 中动态添加文本内容
    String str = "姓名:"+name+",年龄:"+age+"\n"+
           "婚否:"+isMerry+"\n"+
           "爱好:"+hobby+"\n"+
           "城市:"+city;
    showText.setText(str);  
 
}

 //============================打开一个窗体传值的案例==============================
   public void setValuesMyDemo(View view){
     Intent intent = new Intent(this,SecondActivityclass); //创建一个Activity对象
     //开始激活Activity状态为start
     startActivity(intent);
   }

 <Button
 android:id="@+id/button"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:text="Activity窗体传值案例"
 android:onClick="setValuesMyDemo" />

<Button
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="通过Intent传递普通数据" 
    android:onClick="MytestOne"/>

//========================窗体状态保存与恢复====================================
    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
      super.onRestoreInstanceState(savedInstanceState);
      //恢复状态
      if(savedInstanceState!=null){
        String msg = savedInstanceState.getString("message");
        //设置这个数据到需要的地方
        Toast.makeText(this, "以前的消息:"+msg, 50000).show();
      }
    }

//========================保存的状态====================================
    @Override
    protected void onSaveInstanceState(Bundle outState) {
      // TODO Auto-generated method stub
      super.onSaveInstanceState(outState);
      //保存数据
      outState.putString("message", "Hello!");
      Toast.makeText(this, "状态已经保存！", 3000).show();
    }