制作一个登录界面，以SP方式存储用户名。用户下次登录时自动显示上次填写的用户名
1 <?xml version="1.0" encoding="utf-8"?> 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 3 xmlns:tools="http://schemas.android.com/tools" 4 android:layout_width="match_parent" 5 android:layout_height="match_parent" 6 android:paddingBottom="@dimen/activity_vertical_margin" 7 android:paddingLeft="@dimen/activity_horizontal_margin" 8 android:paddingRight="@dimen/activity_horizontal_margin" 9 android:paddingTop="@dimen/activity_vertical_margin" 10 tools:context="com.hanqi.testapp3.a" 11 android:orientation="vertical"> 12 13 <EditText 14 android:layout_width="match_parent" 15 android:layout_height="wrap_content" 16 android:hint="用户名" 17 android:id="@+id/et_yhm"/> 18 19 <EditText 20 android:layout_width="match_parent" 21 android:layout_height="wrap_content" 22 android:hint="密码" 23 android:id="@+id/et_mm"/> 24 25 <LinearLayout 26 android:layout_width="match_parent" 27 android:layout_height="wrap_content"> 28 <Button 29 android:layout_width="0dp" 30 android:layout_height="wrap_content" 31 android:layout_weight="1" 32 android:text="登陆" 33 android:onClick="bt_denglu"/> 34 <Button 35 android:layout_width="0dp" 36 android:layout_height="wrap_content" 37 android:layout_weight="1" 38 android:text="注册"/> 39 </LinearLayout> 40 41 42 43 </LinearLayout>
1 package com.hanqi.testapp3; 2 3 import android.content.SharedPreferences; 4 import android.support.v7.app.AppCompatActivity; 5 import android.os.Bundle; 6 import android.view.View; 7 import android.widget.EditText; 8 import android.widget.Toast; 9 10 public class a extends AppCompatActivity { 11 12 EditText et_yhm; 13 EditText et_mm; 14 15 @Override 16 protected void onCreate(Bundle savedInstanceState) { 17 super.onCreate(savedInstanceState); 18 setContentView(R.layout.activity_a); 19 20 et_yhm = (EditText)findViewById(R.id.et_yhm); 21 et_mm = (EditText)findViewById(R.id.et_mm); 22 23 SharedPreferences sp = getSharedPreferences("name",MODE_APPEND); 24 25 String name = sp.getString("name",null); 26 27 et_yhm.setText(name); 28 } 29 30 public void bt_denglu(View v) 31 { 32 String yhm = et_yhm.getText().toString(); 33 34 SharedPreferences sharedPreferences = getSharedPreferences("name", MODE_APPEND); 35 36 SharedPreferences.Editor editor = sharedPreferences.edit(); 37 38 editor.putString("name",yhm); 39 40 editor.commit(); 41 42 Toast.makeText(a.this, "登陆成功", Toast.LENGTH_SHORT).show(); 43 } 44 }
