SharedPreferences

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;    }    }    }