仿QQ登錄、記住密碼等功能實現

功能：實現賬登錄、檢查賬號密碼、記住密碼、清除記錄功能。
設備：電腦一臺、Android Studio軟件一個。
技術：xml佈局、SharedPreferences的使用。

開始：
1.看效果：


2.文件目錄：

3.activity_main.xml 佈局

<?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:layout_gravity="center"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <ImageView
        android:layout_width="70dp"
        android:layout_height="70dp"
        android:layout_gravity="center"
        android:layout_marginTop="10dp"
        android:src="@drawable/head" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:background="@color/colorWhite"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="用戶名："
            android:textColor="@color/colorBlack"
            android:textSize="12sp" />

        <EditText
            android:id="@+id/et_name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="text" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:background="@color/colorWhite"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="密    碼："
            android:textColor="@color/colorBlack"
            android:textSize="12sp" />

        <EditText
            android:id="@+id/et_password"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="textPassword" />

    </LinearLayout>

    <RadioGroup
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <RadioButton
            android:id="@+id/bt_memory"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="remember"
            android:paddingRight="100dp"
            android:text="記住密碼"
            android:textSize="10sp" />

        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="clcInfo"
            android:text="清除記錄"
            android:textSize="10sp" />
    </RadioGroup>

    <Button
        android:id="@+id/bt_login"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="20dp"
        android:background="@color/colorAccent"
        android:text="登錄"
        android:textColor="@color/colorWhite" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="20dp"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:text="賬號註冊"
            android:textSize="10sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_marginLeft="110dp"
            android:text="忘記密碼？"
            android:textSize="10sp" />
    </LinearLayout>
</LinearLayout>

4.MainActivity文件

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import java.util.Map;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private EditText etName;
    private EditText etPassword;
    private Button login;
    private boolean isRemember;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initView();
        Map<String, String> userInfo = MyService.getUserInfo(this);

        if (userInfo != null) {
            String name = userInfo.get("name");
            String pwd = userInfo.get("pwd");

            etName.setText(name);
            etPassword.setText(pwd);
        }
    }

    private void initView() {
        etName = (EditText) findViewById(R.id.et_name);
        etPassword = (EditText) findViewById(R.id.et_password);

        login = (Button) findViewById(R.id.bt_login);

        login.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {
        String name = etName.getText().toString().trim();
        String pwd = etPassword.getText().toString().trim();

        if (TextUtils.isEmpty(name)) {
            Toast.makeText(this, "請輸入用戶名", Toast.LENGTH_SHORT).show();
            return;
        }
        if (TextUtils.isEmpty(pwd)) {
            Toast.makeText(this, "請輸入密碼", Toast.LENGTH_SHORT).show();
            return;
        }

        Toast.makeText(this, "登錄成功", Toast.LENGTH_SHORT).show();
        Intent intent = new Intent(this,SecondActivity.class);
        startActivity(intent);

        if (isRemember) {
            boolean isSaveSuccess = MyService.saveUserInfo(this, name, pwd);
            if (isSaveSuccess) {
                Toast.makeText(this, "保存成功", Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(this, "保存失敗", Toast.LENGTH_SHORT).show();
            }

        }
    }

    //記住密碼
    public void remember(View view) {
        isRemember = true;
    }

    //清除記錄
    public void clcInfo(View view) {
        boolean isClean = MyService.clearUserInfo(this);
        if (isClean) {
            Toast.makeText(this, "清除成功", Toast.LENGTH_SHORT).show();
            etName.setText("");
            etPassword.setText("");
        } else {
            Toast.makeText(this, "清除失敗", Toast.LENGTH_SHORT).show();
        }
    }
}

5.MyService文件（保存賬號密碼）

import android.content.Context;
import android.content.SharedPreferences;

import java.util.HashMap;
import java.util.Map;


public class MyService {

    //保存QQ賬號和密碼到data.xml文件
    public static boolean saveUserInfo(Context context, String name, String password) {
        SharedPreferences info = context.getSharedPreferences("data", Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = info.edit();  //獲取編輯器
        editor.putString("userName", name);       //存入用戶名
        editor.putString("userPwd", password);
        editor.commit();                            //提交修改
        return true;
    }

    //從data.xml文件中取出賬號與密碼
    public static Map<String, String> getUserInfo(Context context) {
        SharedPreferences info = context.getSharedPreferences("data", Context.MODE_PRIVATE);
        String name = info.getString("userName", null);
        String pwd = info.getString("userPwd", null);
        Map<String, String> userMap = new HashMap<String, String>();
        userMap.put("name", name);
        userMap.put("pwd", pwd);
        return userMap;
    }

    //清除記錄
    public static boolean clearUserInfo(Context context) {
        SharedPreferences info = context.getSharedPreferences("data", Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = info.edit();  //獲取編輯器
        editor.clear();
        editor.commit();                            //提交修改
        return true;
    }
}

6.跳轉的頁面根據自己的需求寫！

附：