feat: SettingsStore shared prefs; Main/session/event read persisted config

app/src/main/java/com/dshwatch/app/EventLogActivity.java

@@ -65,7 +65,10 @@ public class EventLogActivity extends AppCompatActivity {
             }
         });
 
-        client.connect("ws://10.0.2.2:8787/ws", "dshwatch", "change-me");
+        client.connect(
+                SettingsStore.serverUrl(EventLogActivity.this),
+                SettingsStore.userId(EventLogActivity.this),
+                SettingsStore.token(EventLogActivity.this));
     }
 
     @Override

app/src/main/java/com/dshwatch/app/MainActivity.java

@@ -122,8 +122,10 @@ public class MainActivity extends AppCompatActivity {
             @Override
             public void onClick(View v) {
                 status.setText("连接中...");
-                // 空壳：默认连本机模拟器 server；真实地址/用户/Token 从设置读取
-                serverClient.connect("ws://10.0.2.2:8787/ws", "dshwatch", "change-me");
+                String serverUrl = SettingsStore.serverUrl(MainActivity.this);
+                String userId = SettingsStore.userId(MainActivity.this);
+                String token = SettingsStore.token(MainActivity.this);
+                serverClient.connect(serverUrl, userId, token);
                 watchBridge.connect();
             }
         });

app/src/main/java/com/dshwatch/app/SessionListActivity.java

@@ -83,8 +83,10 @@ public class SessionListActivity extends AppCompatActivity {
             }
         });
 
-        // 空壳：默认连本机模拟器 server，后续从设置读取
-        client.connect("ws://10.0.2.2:8787/ws", "dshwatch", "change-me");
+        client.connect(
+                SettingsStore.serverUrl(SessionListActivity.this),
+                SettingsStore.userId(SessionListActivity.this),
+                SettingsStore.token(SessionListActivity.this));
     }
 
     @Override

app/src/main/java/com/dshwatch/app/SettingsActivity.java

@@ -27,8 +27,12 @@ public class SettingsActivity extends AppCompatActivity {
         save.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
-                // 空壳：后续持久化到 SharedPreferences / 安全存储
-                Toast.makeText(SettingsActivity.this, "保存(空壳): " + serverUrl.getText(), Toast.LENGTH_SHORT).show();
+                SettingsStore.save(
+                        SettingsActivity.this,
+                        serverUrl.getText().toString().trim(),
+                        userId.getText().toString().trim(),
+                        token.getText().toString().trim());
+                Toast.makeText(SettingsActivity.this, "已保存", Toast.LENGTH_SHORT).show();
             }
         });
     }

app/src/main/java/com/dshwatch/app/SettingsStore.java

@@ -0,0 +1,32 @@
+package com.dshwatch.app;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+
+public class SettingsStore {
+    private static final String PREFS = "dshwatch";
+    private static final String KEY_SERVER = "serverUrl";
+    private static final String KEY_USER = "userId";
+    private static final String KEY_TOKEN = "token";
+
+    public static void save(Context c, String serverUrl, String userId, String token) {
+        SharedPreferences p = c.getSharedPreferences(PREFS, Context.MODE_PRIVATE);
+        p.edit()
+                .putString(KEY_SERVER, serverUrl == null ? "" : serverUrl)
+                .putString(KEY_USER, userId == null ? "" : userId)
+                .putString(KEY_TOKEN, token == null ? "" : token)
+                .apply();
+    }
+
+    public static String serverUrl(Context c) {
+        return c.getSharedPreferences(PREFS, Context.MODE_PRIVATE).getString(KEY_SERVER, "ws://10.0.2.2:8787/ws");
+    }
+
+    public static String userId(Context c) {
+        return c.getSharedPreferences(PREFS, Context.MODE_PRIVATE).getString(KEY_USER, "dshwatch");
+    }
+
+    public static String token(Context c) {
+        return c.getSharedPreferences(PREFS, Context.MODE_PRIVATE).getString(KEY_TOKEN, "change-me");
+    }
+}