用户登录记住密码

1、login_top.xml布局文件

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:padding="@dimen/activity_horizontal_margin"    android:background="@drawable/logintop_roundbg">    <EditText        android:id="@+id/etName"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:background="@android:drawable/edit_text"        android:ems="10"        android:drawableLeft="@drawable/icon_user"        android:hint="@string/etName"        android:drawablePadding="10dp"        />    <requestFocus />    <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:ems="10"        android:drawableLeft="@drawable/icon_pass"        android:hint="@string/etPass"        android:inputType="textPassword"        android:drawablePadding="10dp"/>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_below="@id/etPassword">        <CheckBox            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1"            android:text="记住密码"            android:layout_marginLeft="10dp"            android:id="@+id/check"            />        <Button            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1"            android:layout_marginLeft="10dp"            android:background="@drawable/btn_select"            android:text="@string/btnLogin"            android:onClick="submit"            android:id="@+id/btnsubmit"/>    </LinearLayout></RelativeLayout>

2、activity_login.xml布局文件

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    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"></include>    <ImageView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:background="@drawable/deer"        android:layout_alignParentRight="true"        android:layout_alignParentBottom="true"/></RelativeLayout>

3、LoginActivity交互代码

package cn.edu.bzu.case_login;import android.content.Intent;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;import java.util.HashMap;import java.util.Map;import cn.edu.bzu.case_login.model.ServiceShared;public class LoginActivity extends AppCompatActivity {    private EditText edName;    private EditText edPassword;    private CheckBox check;    private Button btnsubmit;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_login);        edName = (EditText) findViewById(R.id.etName);        edPassword = (EditText) findViewById(R.id.etPassword);        check = (CheckBox) findViewById(R.id.check);        btnsubmit = (Button) findViewById(R.id.btnsubmit);        ServiceShared serviceShared = new ServiceShared(this);        HashMap data = serviceShared.getUserInfo();        if ((boolean) data.get("isremember")) {            edName.setText(data.get("name").toString());            edPassword.setText(data.get("pass").toString());            check.setChecked(true);        }    }    public void submit(View view) {        if (edName.getText().toString().equals("")) {//判断账号是否为空            Toast.makeText(this, "账号不能为空！", Toast.LENGTH_SHORT).show();            return;        }        if (edPassword.getText().toString().equals("")) {//判断密码是否为空            Toast.makeText(this, "密码不能为空！", Toast.LENGTH_SHORT).show();            return;        }        if (check.isChecked()) {//选择记住密码并保存密码            ServiceShared ss = new ServiceShared(this);            boolean temp = ss.save(edName.getText().toString(), edPassword.getText().toString());            if (temp) {                Toast.makeText(this, "记住密码成功", Toast.LENGTH_SHORT).show();                Intent intent = new Intent(this, SubmitActivity.class);                intent.putExtra("name", edName.getText().toString());                startActivity(intent);            }        } else {//判断账号密码是否正确            ServiceShared serviceShared = new ServiceShared(this);            HashMap data = serviceShared.getUserInfo();            String username = data.get("name").toString();            String password = data.get("pass").toString();            String name = edName.getText().toString();            String pass = edPassword.getText().toString();            if ((name.equals(username)) && (pass.equals(password))) {                Intent intent = new Intent(this, SubmitActivity.class);                intent.putExtra("name", edName.getText().toString());                startActivity(intent);            } else {                Toast.makeText(this, "用户名或密码错误", Toast.LENGTH_LONG).show();            }        }    }}

4、activity_submit.xml布局文件

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_submit"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="cn.edu.bzu.case_login.SubmitActivity">    <LinearLayout        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerInParent="true"        >        <ImageView            android:layout_width="50dp"            android:layout_height="50dp"            android:layout_marginRight="10dp"            android:background="@drawable/smile_blak" />        <TextView            android:id="@+id/subtext"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_centerInParent="true"            android:text="Welcom"            android:textSize="36sp" />    </LinearLayout></RelativeLayout>

5、SubmitActivity代码

package cn.edu.bzu.case_login;import android.content.Intent;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.TextView;import android.widget.Toast;public class SubmitActivity extends AppCompatActivity {    private TextView subtext;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_submit);        Toast.makeText(this, "登录成功", Toast.LENGTH_LONG).show();        subtext = (TextView) findViewById(R.id.subtext);        Intent intent = getIntent();        subtext.setText("welcom  " + intent.getStringExtra("name"));    }}

6、ServiceShared.java工具类

package cn.edu.bzu.case_login.model;import android.content.Context;import android.content.SharedPreferences;import java.util.HashMap;import java.util.Map;/** * Created by Administrator on 2017/4/8. */public class ServiceShared {    private Context context;    public ServiceShared(Context context) {        this.context = context;    }    public boolean save(String name, String pass) {//存储信息        SharedPreferences sharedPreferences = context.getSharedPreferences("checkLogin.text", Context.MODE_PRIVATE);        SharedPreferences.Editor editor = sharedPreferences.edit();        editor.putBoolean("isremember", true);        editor.putString("name", name);        editor.putString("pass", pass);        editor.commit();        return true;    }    public HashMap getUserInfo() {//读取信息        HashMap data = new HashMap();        SharedPreferences sharedPreferences = context.getSharedPreferences("checkLogin.text", Context.MODE_PRIVATE);        String username = sharedPreferences.getString("name", null);        String password = sharedPreferences.getString("pass", null);        data.put("isremember", sharedPreferences.getBoolean("isremember", false));        data.put("name", username);        data.put("pass", password);        return data;    }}

运行结果图