Android 简单登陆涉及 Button CheckBox TextView EditText简单应用-白红宇

Android 简单登陆涉及 Button CheckBox TextView EditText简单应用

阅读量：5105 次

发布时间：2019-06-13

本文共 4367 字，大约阅读时间需要 14 分钟。

GitHub地址:https://github.com/1165863642/LoginDemo

直接贴代码<?xml version="1.0" encoding="utf-8"?<LinearLayout

xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:gravity="center"    android:orientation="vertical"    tools:context=".MainActivity">

1 package com.example.a11658.logindemo; 2  3 import android.content.SharedPreferences; 4 import android.os.Bundle; 5 import android.support.v7.app.AppCompatActivity; 6 import android.text.Editable; 7 import android.text.TextUtils; 8 import android.text.TextWatcher; 9 import android.view.View;10 import android.widget.Button;11 import android.widget.CheckBox;12 import android.widget.EditText;13 import android.widget.Toast;14 15 public class MainActivity extends AppCompatActivity {16 17     Button btn_login, btn_cancel;18     EditText et_user, et_pass;19     CheckBox cb_remember;20     SharedPreferences spf;21 22     @Override23     protected void onCreate(Bundle savedInstanceState) {24         super.onCreate(savedInstanceState);25         setContentView(R.layout.activity_main);26         initView();27     }28 29     //初始化控件30     private void initView() {31         spf = getSharedPreferences("test", MODE_PRIVATE);32         //关联控件33         btn_cancel = findViewById(R.id.btn_cancel);34         btn_login = findViewById(R.id.btn_login);35         et_pass = findViewById(R.id.et_pass);36         et_user = findViewById(R.id.et_user);37         cb_remember = findViewById(R.id.cb_remember);38         et_user.setText(spf.getString("username", "111"));39         //点击事件40         btn_login.setOnClickListener(new View.OnClickListener() {41             @Override42             public void onClick(View v) {43                 //登陆44                 //1.获取用户名密码45                 String username = et_user.getText().toString().trim();46                 String password = et_pass.getText().toString().trim();47                 //2.判断是否记住用户名48                 if (cb_remember.isChecked()) {  //判断CheckBox选中状态49                     spf.edit().putString("username", username).commit();50                 } else {51                     spf.edit().clear().commit();52                 }53 54                 //3.判断用户名密码是否正确55                 if (!TextUtils.isEmpty(username) && !TextUtils.isEmpty(password)) {56                     if (username.equals("user") && password.equals("pass")) {57                         Toast.makeText(MainActivity.this, "登陆成功", Toast.LENGTH_SHORT).show();58                     } else {59                         Toast.makeText(MainActivity.this, "用户名密码不正确", Toast.LENGTH_SHORT).show();60                     }61                 } else {62                     Toast.makeText(MainActivity.this, "输入框不能为空", Toast.LENGTH_SHORT).show();63                 }64             }65         });66 67         btn_cancel.setOnClickListener(new View.OnClickListener() {68             @Override69             public void onClick(View v) {70                 finish();71             }72         });73 74         et_pass.addTextChangedListener(new TextWatcher() {75             @Override76             public void beforeTextChanged(CharSequence s, int start, int count, int after) {77                 //文字改变前78                 Toast.makeText(MainActivity.this,"请输入", Toast.LENGTH_SHORT).show();79             }80 81             @Override82             public void onTextChanged(CharSequence s, int start, int before, int count) {83                 //正在输入84                 Toast.makeText(MainActivity.this,"正在输入", Toast.LENGTH_SHORT).show();85             }86 87             @Override88             public void afterTextChanged(Editable s) {89                 //输入结束后90                 Toast.makeText(MainActivity.this,"输入结束后", Toast.LENGTH_SHORT).show();91             }92         });93     }94 }

效果图：：