xml主界面

Java实现

package cn.edu.niit.store;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class MainActivity extends AppCompatActivity {
//获取相关控件
private EditText username;
private EditText userage;
private Button write;
private Button read;

@Override

    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //获取组件
    username = (EditText) findViewById(R.id.name);
    userage = (EditText) findViewById(R.id.age);
    write= (Button)findViewById(R.id.write);
    //设置监听事件
    write.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
    String name = username.getText().toString();
    String age = userage.getText().toString();
    //使用saveToFile方法，对其进行写入
    if(saveToFile(name)){
    Toast.makeText( MainActivity.this,"保存成功" ,Toast.LENGTH_SHORT).show();

    }
    }
    });
    //设置监听事件
    read = (Button)findViewById(R.id.read);
    read.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
    String name = username.getText().toString();
    String filename = "data.txt";
    String result = "";
    try{
    //打开文件，并读取其数据
    FileInputStream in = openFileInput( filename );
    BufferedReader reader = new BufferedReader( new InputStreamReader( in ) );
    name = reader.readLine();
    } catch (FileNotFoundException e) {
    e.printStackTrace();
    } catch (IOException e) {
    e.printStackTrace();
    }
    name = username.getText().toString();
    String age = userage.getText().toString();
    Toast.makeText(MainActivity.this, "输入姓名"+name+",年龄：" + age,Toast.LENGTH_SHORT).show();
    }
    });
    }

    private boolean saveToFile(String Name) {
    //打开文件
    try {

    FileOutputStream out = openFileOutput("data.txt",  MODE_PRIVATE );
    BufferedWriter writer = new BufferedWriter( new OutputStreamWriter( out ) );
    writer.write(Name);
    out.close();//关闭文件输入流
    return true;
    } catch (Exception e) {
    e.printStackTrace();
    return false;
    }
    }
    }

SharedPreferences