zoukankan      html  css  js  c++  java
  • 登陆

    1,布局

    <?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:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        android:orientation="vertical"
        tools:context="com.example.app3.MainActivity">
    <LinearLayout
        android:layout_width="match_parent"
        android:orientation="horizontal"
        android:layout_height="wrap_content">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="用户名:"/>
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/name"/>
    </LinearLayout>
        <LinearLayout
            android:layout_width="match_parent"
            android:orientation="horizontal"
            android:layout_height="wrap_content">
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="密  码:"/>
            <EditText
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:id="@+id/pass"/>
        </LinearLayout>
        <CheckBox
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="记住密码"
            android:id="@+id/reme"/>
        <LinearLayout
            android:layout_width="match_parent"
            android:orientation="horizontal"
            android:gravity="center"
            android:layout_height="wrap_content">
            <Button
                android:onClick="doClick"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="登陆"
                android:id="@+id/btn_login"/>
            <Button
                android:onClick="doClick"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="重置"
                android:id="@+id/btn_reset"/>
        </LinearLayout>
    </LinearLayout>

    2,逻辑

    package com.example.app3;
    
    import android.content.SharedPreferences;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.Button;
    import android.widget.CheckBox;
    import android.widget.EditText;
    import android.widget.Toast;
    
    public class MainActivity extends AppCompatActivity {
        private EditText et_name,et_pass;
        private Button btn_login,btn_reset;
        private CheckBox cb;
        private SharedPreferences sp;
        private static final int MODEL=MODE_PRIVATE;
        private SharedPreferences.Editor  editor;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            et_name=(EditText)findViewById(R.id.name);
            et_pass=(EditText)findViewById(R.id.pass);
            btn_login=(Button)findViewById(R.id.btn_login);
            cb=(CheckBox)findViewById(R.id.reme);
            sp=getSharedPreferences("info",MODEL);
            editor=sp.edit();
    
            //二次登陆
            String s_name=sp.getString("u_name","");
            String s_pass=sp.getString("u_pass","");
            et_name.setText(s_name);
            if(s_pass=="" || s_pass==null)
            {
                cb.setChecked(false);
            }
            else
            {
                et_pass.setText(s_pass);
                cb.setChecked(true);
            }
    
        }
    
        public void doClick(View v)
        {
            switch(v.getId())
            {
                case R.id.btn_login:
                String name=et_name.getText().toString();
                    String pass= et_pass.getText().toString();
                    editor.putString("u_name",name);
                    if(name.equals("zhangsan")&&pass.equals("123"))
                    {
                        Toast.makeText(MainActivity.this,"success",Toast.LENGTH_LONG).show();
                       if(cb.isChecked())
                       {
    
                           editor.putString("u_pass",pass);
                           editor.commit();
    
                       }
                        else
                       {
                           editor.remove("u_pass");
                       }
                    }
                    else
                    {
                        Toast.makeText(MainActivity.this,"faile",Toast.LENGTH_LONG).show();
                    }
                    editor.commit();
                    break;
                case R.id.btn_reset:
                    et_pass.setText("");
                    et_name.setText("");
                    cb.setChecked(false);
                    break;
            }
        }
    }

    3,显示

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  • 原文地址:https://www.cnblogs.com/excellencesy/p/9076758.html
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