ADD file via upload

main/java/com/example/musicwork/SignIn.java

@@ -0,0 +1,79 @@
+package com.example.musicwork;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.app.AlertDialog;
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import com.example.musicwork.chuangguan.GameActivity;
+
+public class SignIn extends AppCompatActivity {
+    public static String author_name;
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_login);
+        Button signin = (Button) findViewById(R.id.signin);
+        final Data data = (Data)getApplication();
+        signin.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                final String name = ((EditText) findViewById(R.id.etname)).getText().toString();
+                String password = ((EditText) findViewById(R.id.etpassword)).getText().toString();
+
+                if (com.example.musicwork.chuangguan.UserService.signIn(name, password))
+                    runOnUiThread(new Runnable() {
+                        @Override
+                        public void run() {
+                            data.setUsername(name);
+                            author_name=name;
+                            Toast.makeText(SignIn.this, "登录成功", Toast.LENGTH_SHORT).show();
+                            Intent intent = new Intent(SignIn.this, MainActivity.class);
+                            startActivity(intent);
+
+                        }
+                    });
+                else {
+                    runOnUiThread(new Runnable() {
+                        @Override
+                        public void run() {
+
+                            Toast.makeText(SignIn.this, "登录失败，请检查用户名和密码是否正确。未注册账户请注册后登录", Toast.LENGTH_SHORT).show();
+                        }
+                    });
+                }
+            }
+        });
+
+
+        Button signup = (Button) findViewById(R.id.signup);
+        signup.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                String name = ((EditText) findViewById(R.id.etname)).getText().toString();
+                String password = ((EditText) findViewById(R.id.etpassword)).getText().toString();
+                if (com.example.musicwork.chuangguan.UserService.signUp(name, password))
+                    runOnUiThread(new Runnable() {
+                        @Override
+                        public void run() {
+                            Toast.makeText(SignIn.this, "注册成功，请重新登录", Toast.LENGTH_SHORT).show();
+                        }
+                    });
+                else {
+                    runOnUiThread(new Runnable() {
+                        @Override
+                        public void run() {
+                            Toast.makeText(SignIn.this, "注册失败", Toast.LENGTH_SHORT).show();
+                        }
+                    });
+                }
+            }
+        });
+    }
+}