存储

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.hanqi.zuoyee.cunchu_denglu">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="请输入账号"
android:id="@+id/et1"/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="请输入密码"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center">
<Button
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="登录"
android:onClick="b1"/>
<Button
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="注册"/>
</LinearLayout>
</LinearLayout>

package com.hanqi.zuoyee;

import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.EditText;

public class cunchu_denglu extends AppCompatActivity {
EditText et;
String zh;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cunchu_denglu);
et=(EditText)findViewById(R.id.et1);
SharedPreferences s=getSharedPreferences("a",MODE_PRIVATE);
zh=s.getString("zhanghao",null);
if(zh!=null){
et.setText(zh);
}
}
public void b1(View v){
SharedPreferences s=getSharedPreferences("a", MODE_PRIVATE);
SharedPreferences.Editor editor = s.edit();
zh=et.getText().toString();
if(zh.trim().length()==0){
return;
}
editor.putString("zhanghao",zh);
editor.commit();

}
}