<LinearLayout
   xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical"
   >

  <EditText 
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/main_et_name"
    android:hint="你的用戶名"
    />
    <EditText 
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/main_et_password"
    android:hint="你的密碼"
    />
     <EditText 
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/main_et_age"
    android:hint="你的年齡"
    />

  <Button
    android:onClick="save"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="保存數(shù)據(jù)" />

   <Button
    android:onClick="read"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="讀取數(shù)據(jù)" />

   <TextView 
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="數(shù)據(jù)"
    android:id="@+id/main_tv"
    />
</LinearLayout>

package com.example.lesson18_serializable;
import java.io.Serializable;
/**
 *屬性類，用來存儲數(shù)據(jù)，繼承接口Serializable，但是什么方法都不用重寫！
 */
public class People implements Serializable{
  //定義基本信息
  String name;
  String password;
  int age;
  //無參構(gòu)造方法
  public People() {
    super();
  }
  //有參構(gòu)造方法，方便數(shù)據(jù)寫入
  public People(String name, String password, int age) {
    super();
    this.name = name;
    this.password = password;
    this.age = age;
  }

  //重寫toString方法，方便顯示
  @Override
  public String toString() {
    return "People [name=" + name + ", password=" + password + ", age="
        + age ;
  }

}

package com.example.lesson18_serializable;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity {

  //保存文件的路徑
  String path=Environment.getExternalStorageDirectory().getAbsolutePath()+"/people.txt";
  //定義布局內(nèi)的控件
  EditText edit_name;
  EditText edit_password;
  EditText edit_age;
  TextView text;


  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //實例化布局控件
    edit_name=(EditText) findViewById(R.id.main_et_name);
    edit_password=(EditText) findViewById(R.id.main_et_password);
    edit_age=(EditText) findViewById(R.id.main_et_age);
    text=(TextView) findViewById(R.id.main_tv);
  }

  //保存數(shù)據(jù)
  public void save(View view){  
      ObjectOutputStream fos=null;
    try {

      //如果文件不存在就創(chuàng)建文件
      File file=new File(path);
      //file.createNewFile();
      //獲取輸出流
      //這里如果文件不存在會創(chuàng)建文件，這是寫文件和讀文件不同的地方
      fos=new ObjectOutputStream(new FileOutputStream(file));
      //獲取輸入框內(nèi)的文件進行寫入
      String name=edit_name.getText().toString();
      String password=edit_password.getText().toString();
      int age=Integer.parseInt(edit_age.getText().toString());
      People people=new People(name, password, age);
      //這里不能再用普通的write的方法了
      //要使用writeObject
      fos.writeObject(people);;
    } catch (Exception e) {
      e.printStackTrace();
    }finally{
      try {
        if (fos!=null) {
          fos.close();
        }
      } catch (IOException e) {
      }

    }

  }

  //讀取數(shù)據(jù)
  public void read(View view){
    ObjectInputStream ois=null;
    try {
      Log.e("TAG", new File(path).getAbsolutePath()+"<---");
      //獲取輸入流
      ois=new ObjectInputStream(new FileInputStream(new File(path)));
      //獲取文件中的數(shù)據(jù)
      Object people=ois.readObject();
      //把數(shù)據(jù)顯示在TextView中
       text.setText(people.toString());
    } catch (Exception e) {
      e.printStackTrace();
    }finally{
      try {
        if (ois!=null) {
          ois.close();
        }
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }

}

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

package com.example.lesson18_parcalable;
import android.os.Parcel;
import android.os.Parcelable;
/**
 *屬性類，繼承Parcelable
 *實現(xiàn)兩個方法，在其中一個方法內(nèi)實現(xiàn)對象寫入的操作
 *創(chuàng)建一個接口類CREATOR，重寫讀取對象的方法
 */
public class User implements Parcelable{

  //User的各種數(shù)據(jù)的定義
  String name;
  String password;
  int age;
  double money;
  boolean isAdmin;

  public User(){}

  //寫一個構(gòu)造方法來方便寫入數(shù)據(jù)
  public User(String name, String password, int age, double money,
      boolean isAdmin) {
    super();
    this.name = name;
    this.password = password;
    this.age = age;
    this.money = money;
    this.isAdmin = isAdmin;
  }

  @Override
  // 這個方法沒什么用
  public int describeContents() {
    return 0;
  }

  @Override
  // 寫數(shù)據(jù)的底層實現(xiàn) 
  public void writeToParcel(Parcel arg0, int arg1) {
     arg0.writeString(name);
     arg0.writeString(password);
     arg0.writeInt(age);
     arg0.writeDouble(money);
     //把布爾類型的數(shù)據(jù)做處理，true1，false0
     arg0.writeInt(isAdmin?1:0);
  }

  //實例化靜態(tài)內(nèi)部對象CREATOR實現(xiàn)接口,CREATOR名字不能改變，否則會報錯
  public static Creator CREATOR=new Creator<User>() {
    @Override
    // 讀書數(shù)據(jù)的底層實現(xiàn)，要和寫入的數(shù)據(jù)的順序保持一致
    public User createFromParcel(Parcel arg0) {
      User user=new User();
      user.name=arg0.readString();
      user.password=arg0.readString();
      user.age=arg0.readInt();
      user.money=arg0.readDouble();
      //布爾類型的數(shù)據(jù)要處理
      user.isAdmin=arg0.readInt()==1?true:false;
      return user;
    }

    @Override
    public User[] newArray(int arg0) {
       //返回
      return new User[arg0];
    }
  };

  //從toString方法
  @Override
  public String toString() {
    return "User [name=" + name + ", password=" + password + ", age=" + age
        + ", money=" + money + ", isAdmin=" + isAdmin + "]";
  }

}

package com.example.lesson18_parcalable;

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

public class MainActivity extends Activity {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState); 

    Button button=new Button(this);
    button.setText("跳轉(zhuǎn)到B頁面");

    setContentView(button);
    button.setOnClickListener(new OnClickListener() {      
      @Override
      public void onClick(View arg0) {
         //跳轉(zhuǎn)到另一個頁面，對象的數(shù)據(jù)也要傳遞過去
        Intent intent=new Intent(MainActivity.this,OtherActivity.class);
        //定義數(shù)據(jù)
        User user=new User("liwenzhi","123456",22,1000000,true);
        //把數(shù)據(jù)放到Intent對象里面
        intent.putExtra("user", user);
        //實現(xiàn)頁面跳轉(zhuǎn)
        startActivity(intent);
      }
    });

  }
}

package com.example.lesson18_parcalable;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class OtherActivity extends Activity{
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    TextView textView=new TextView(this);
    textView.setTextSize(30);
    //獲取傳遞過來的數(shù)據(jù)
    User user=getIntent().getParcelableExtra("user");
    textView.setText(user.toString());   
    setContentView(textView);



  }

}