增加登陆界面

src/sixaunyi/app/.idea/.gitignore

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+# 默认忽略的文件
+/shelf/
+/workspace.xml

src/sixaunyi/app/.idea/gradle.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GradleSettings">
+    <option name="linkedExternalProjectsSettings">
+      <GradleProjectSettings>
+        <option name="testRunner" value="GRADLE" />
+        <option name="distributionType" value="DEFAULT_WRAPPED" />
+        <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="gradleHome" value="$PROJECT_DIR$/../../../../../AndroidTool/gradle-4.5.1" />
+      </GradleProjectSettings>
+    </option>
+  </component>
+</project>

src/sixaunyi/app/.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" project-jdk-name="Android Studio default JDK" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/build/classes" />
+  </component>
+  <component name="ProjectType">
+    <option name="id" value="Android" />
+  </component>
+</project>

src/sixaunyi/app/.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/modules/app.iml" filepath="$PROJECT_DIR$/.idea/modules/app.iml" />
+    </modules>
+  </component>
+</project>

src/sixaunyi/app/.idea/vcs.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/../../.." vcs="Git" />
+  </component>
+</project>

src/sixaunyi/app/src/main/java/com/example/sixaunyi/LoginActivity.java

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+public class LoginActivity extends AppCompatActivity {
+
+    private EditText mUsername;
+    private EditText mPassword;
+    private Button mLoginButton;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_login);
+
+        // 获取输入框和按钮的实例
+        mUsername = findViewById(R.id.username);
+        mPassword = findViewById(R.id.password);
+        mLoginButton = findViewById(R.id.login);
+
+        // 设置登录按钮的点击事件
+        mLoginButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                // 获取用户输入的用户名和密码
+                String username = mUsername.getText().toString();
+                String password = mPassword.getText().toString();
+
+                // 验证用户名和密码是否正确
+                if (username.equals("admin") && password.equals("123456" || username.equals("tiequan") && password.equals("8731" )) {
+                    // 如果验证成功，跳转到主界面
+                    Intent intent = new Intent(LoginActivity.this, MainActivity.class);
+                    startActivity(intent);
+                    finish(); // 关闭登录界面
+                } else {
+                    // 如果验证失败，在输入框下方提示错误信息
+                    Toast.makeText(LoginActivity.this, "用户名或密码错误", Toast.LENGTH_SHORT).show();
+                }
+            }
+        });
+    }
+}

src/sixaunyi/app/src/main/res/layout/activity_login.xml

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+<?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="match_parent"
+    android:padding="16dp">
+
+    <EditText
+        android:id="@+id/username"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:hint="用户名"/>
+
+    <EditText
+        android:id="@+id/password"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_below="@id/username"
+        android:layout_marginTop="16dp"
+        android:hint="密码"
+        android:inputType="textPassword"/>
+
+    <Button
+        android:id="@+id/login"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_below="@id/password"
+        android:layout_marginTop="32dp"
+        android:text="登陆"/>
+
+</RelativeLayout>