Android Studio学习路程（10）

Posted 2021-03-09 mashuxia

今天学习了制作登录页面，并实现记住账户的功能。

  1 package com.example.hp.app4;
  2 
  3 import android.content.Context;
  4 import android.content.SharedPreferences;
  5 import android.os.Bundle;
  6 import android.support.v7.app.ActionBarActivity;
  7 import android.text.Editable;
  8 import android.text.TextWatcher;
  9 import android.util.Log;
 10 import android.widget.CheckBox;
 11 import android.widget.CompoundButton;
 12 import android.widget.EditText;
 13 
 14 public class MainActivity extends ActionBarActivity {
 15     private EditText mEtPhone;
 16     private EditText mEtPasswd;
 17     private CheckBox mCBPsd;
 18     private String TAG ="MainActivity";
 19     private String SP_PHONE = "sp_phone";
 20     private String SP_PASSWD = "sp_passwd";
 21     private String SP_IS_REMEMBER_PSD = "sp_is_remember_psd";
 22     private SharedPreferences sharedPreferences;
 23     private boolean mIsChecked=false;
 24 
 25     @Override
 26     protected void onCreate(Bundle savedInstanceState) {
 27         super.onCreate(savedInstanceState);
 28         setContentView(R.layout.activity_main);
 29         //初始化控件
 30         initUI();
 31         //初始化数据
 32         initData();
 33     }
 34 
 35     private void initData() {
 36         //实例化sharedPreferences对象
 37         if(sharedPreferences==null){
 38             sharedPreferences = getApplicationContext().getSharedPreferences("config", Context.MODE_PRIVATE);
 39         }
 40         //回显数据
 41         mEtPhone.setText(sharedPreferences.getString(SP_PHONE,""));
 42         mEtPasswd.setText(sharedPreferences.getString(SP_PASSWD,""));
 43         mCBPsd.setChecked(mIsChecked);
 44     }
 45 
 46     private void initUI() {
 47         //获取电话和密码输入框
 48         mEtPhone = (EditText) findViewById(R.id.et_phone);
 49         //文本改变之后记录电话
 50         mEtPhone.addTextChangedListener(new TextWatcher() {
 51             @Override
 52             public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
 53 
 54             }
 55 
 56             @Override
 57             public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
 58 
 59             }
 60 
 61             @Override
 62             public void afterTextChanged(Editable editable) {
 63                 if(mIsChecked){
 64                     if(sharedPreferences==null){
 65                         sharedPreferences = getApplicationContext().getSharedPreferences("config", Context.MODE_PRIVATE);
 66                     }
 67                     SharedPreferences.Editor edit = sharedPreferences.edit();
 68                     edit.putString(SP_PHONE, mEtPhone.getText().toString());
 69                     edit.commit();
 70                 }
 71             }
 72         });
 73         mEtPasswd = (EditText) findViewById(R.id.et_passwd);
 74         mEtPasswd.addTextChangedListener(new TextWatcher() {
 75             @Override
 76             public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
 77 
 78             }
 79 
 80             @Override
 81             public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
 82 
 83             }
 84 
 85             @Override
 86             public void afterTextChanged(Editable editable) {
 87                 if(mIsChecked){
 88                     if(sharedPreferences==null){
 89                         sharedPreferences = getApplicationContext().getSharedPreferences("config", Context.MODE_PRIVATE);
 90                     }
 91                     SharedPreferences.Editor edit = sharedPreferences.edit();
 92                     edit.putString(SP_PASSWD, mEtPasswd.getText().toString());
 93                     edit.commit();
 94                 }
 95             }
 96         });
 97         //获取多选按钮
 98         mCBPsd = (CheckBox) findViewById( R.id.cb_remember_psd);
 99         mCBPsd.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
100             @Override
101             public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {
102                 Log.d(TAG, "状态为：" + isChecked);
103                 mIsChecked = isChecked;
104                 if (isChecked) {
105                     //实例化SharedPreferences对象
106                     if (sharedPreferences == null) {
107                         sharedPreferences = getApplicationContext().getSharedPreferences("config", Context.MODE_PRIVATE);
108                     }
109                     //实例化SharedPreferences的编辑者对象
110                     SharedPreferences.Editor edit = sharedPreferences.edit();
111                     edit.putString(SP_PHONE, mEtPhone.getText().toString());
112                     edit.putString(SP_PASSWD, mEtPasswd.getText().toString());
113                     edit.putBoolean(SP_IS_REMEMBER_PSD, isChecked);
114                     //提交
115                     edit.commit();
116 
117 
118                 }
119             }
120         });
121     }
122 }

 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:orientation="vertical"
 7     android:paddingBottom="@dimen/activity_vertical_margin"
 8     android:paddingLeft="@dimen/activity_horizontal_margin"
 9     android:paddingRight="@dimen/activity_horizontal_margin"
10     android:paddingTop="@dimen/activity_vertical_margin"
11     tools:context="com.example.hp.app4.MainActivity">
12 
13     <EditText
14         android:id="@+id/et_phone"
15         android:inputType="phone"
16         android:hint="电话:"
17         android:layout_width="match_parent"
18         android:layout_height="wrap_content" />
19 
20     <EditText
21         android:id="@+id/et_passwd"
22         android:inputType="textPassword"
23         android:hint="密码:"
24         android:layout_width="match_parent"
25         android:layout_height="wrap_content" />
26     <CheckBox
27         android:id="@+id/cb_remember_psd"
28         android:text="记住账户"
29         android:layout_width="wrap_content"
30         android:layout_height="wrap_content" />
31 
32     <Button
33         android:id="@+id/btn_denglu"
34         android:text="登录"
35         android:layout_width="match_parent"
36         android:layout_height="wrap_content" />
37 </LinearLayout>

下面是运行的结果截图：

 

 然后虚拟机上返回，再打开：