功能：实现账登录、检查账号密码、记住密码、清除记录功能。
设备：电脑一台、Android Studio软件一个。
技术：xml布局、SharedPreferences的使用。
开始：
1.看效果：
2.文件目录：
3.activity_main.xml 布局
<?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="用户名：" 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 码：" 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="记住密码" android:textSize="10sp" /> <RadioButton android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="clcInfo" android:text="清除记录" 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="登录" 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="账号注册" android:textSize="10sp" /> <TextView android:layout_width="wrap_content" android:layout_height="match_parent" android:layout_marginLeft="110dp" android:text="忘记密码？" 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, "请输入用户名", Toast.LENGTH_SHORT).show(); return; } if (TextUtils.isEmpty(pwd)) { Toast.makeText(this, "请输入密码", Toast.LENGTH_SHORT).show(); return; } Toast.makeText(this, "登录成功", 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, "保存失败", Toast.LENGTH_SHORT).show(); } } } //记住密码 public void remember(View view) { isRemember = true; } //清除记录 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, "清除失败", Toast.LENGTH_SHORT).show(); } } } 5.MyService文件（保存账号密码）
import android.content.Context; import android.content.SharedPreferences; import java.util.HashMap; import java.util.Map; public class MyService { //保存QQ账号和密码到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(); //获取编辑器 editor.putString("userName", name); //存入用户名 editor.putString("userPwd", password); editor.commit(); //提交修改 return true; } //从data.xml文件中取出账号与密码 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; } //清除记录 public static boolean clearUserInfo(Context context) { SharedPreferences info = context.getSharedPreferences("data", Context.MODE_PRIVATE); SharedPreferences.Editor editor = info.edit(); //获取编辑器 editor.clear(); editor.commit(); //提交修改 return true; } } 6.跳转的页面根据自己的需求写！
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