android 用户登录及记录密码功能

来源：互联网发布：汽车can网络是什么编辑：程序博客网时间：2024/06/05 18:19

1、下面是登陆界面

代码如下：

<RelativeLayout 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:id="@+id/activity_login"    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:background="@drawable/loginbg"    tools:context="cn.edu.bzu.case_login.LoginActivity">    <include        layout="@layout/login_top"        android:id="@+id/include"></include>    <ImageView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        app:srcCompat="@drawable/deer"        android:layout_marginBottom="29dp"        android:id="@+id/imageView"        android:layout_marginRight="21dp"        android:layout_marginEnd="21dp"        android:layout_alignParentBottom="true"        android:layout_alignParentRight="true"        android:layout_alignParentEnd="true" /></RelativeLayout>

2、欢迎界面

代码如下：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent">    <TextView        android:id="@+id/textView"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentTop="true"        android:layout_centerHorizontal="true"        android:textSize="40sp"        android:text="Welcome you" /></RelativeLayout>

3、用户名密码输入界面，上面那个界面只是显示用的，这个才是真正处理数据的。

代码如下：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:background="@drawable/logintop_roundbg"    android:padding="@dimen/activity_horizontal_margin"    >    <EditText        android:id="@+id/etName"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:background="@android:drawable/edit_text"        android:drawableLeft="@drawable/icon_user"        android:drawablePadding="10dp"        android:ems="10"        android:hint="@string/etName">        <requestFocus />    </EditText>    <EditText        android:id="@+id/etPassword"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_below="@id/etName"        android:background="@android:drawable/edit_text"        android:drawableLeft="@drawable/icon_pass"        android:drawablePadding="10dp"        android:ems="10"        android:hint="@string/etPass"        android:inputType="textPassword">        <requestFocus />    </EditText>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_below="@id/etPassword">        <CheckBox            android:id="@+id/cbIsRememberPass"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1"            android:text="@string/cbIsRememberPass"            android:textSize="20sp"/>        <Button            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1"            android:background="@drawable/btn_select"            android:text="@string/btnLogin"            android:onClick="login" />    </LinearLayout></RelativeLayout>

4、mainActivity

代码如下：

public class MainActivity extends AppCompatActivity{    @Override    protected void onCreate(Bundle savedInstanceState){        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }}

5、LoginActivity登录java文件，判断是否选中记住密码，然后执行不同命令。

代码如下：

public class LoginActivity extends AppCompatActivity {    private EditText etName;    private EditText etPassword;    private CheckBox cbIsRememberPass;    private SharedPreferences sharedPreferences;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_login);        initViews();        sharedPreferences = getSharedPreferences("rememberpassword", Context.MODE_PRIVATE);        boolean isRemember = sharedPreferences.getBoolean("rememberpassword", false);        if (isRemember) {            String name = sharedPreferences.getString("name", "");            String password = sharedPreferences.getString("password", "");            etName.setText(name);            etPassword.setText(password);            cbIsRememberPass.setChecked(true);        }    }    public void initViews() {        etName = (EditText) findViewById(R.id.etName);        etPassword = (EditText) findViewById(R.id.etPassword);        cbIsRememberPass = (CheckBox) findViewById((R.id.cbIsRememberPass));    }    public void login(View view) {        String name = etName.getText().toString();        String password = etPassword.getText().toString();        if ("admin".equals(name) && "123456".equals(password)) {            SharedPreferences.Editor editor = sharedPreferences.edit();            if (cbIsRememberPass.isChecked()) {                editor.putBoolean("rememberpassword", true);                editor.putString("name", name);                editor.putString("password", password);            } else {                editor.clear();            }            editor.commit();            Intent intent = new Intent(this, MainActivity.class);            startActivity(intent);            finish();        } else {            Toast.makeText(this, "账号或密码有误", Toast.LENGTH_SHORT).show();        }    }}

运行结果：首先第一次登陆会这样

如果选择记住密码

下次打开时会如下界面：

可以直接登陆

如果选择不记住密码则需要重新输入

界面如下

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