[fix] resolve cross-platform build warnings

apps/android/app/build.gradle

@@ -1,27 +1,27 @@
 plugins { id 'com.android.application' }
 
 android {
-    namespace 'cn.crossdesk.mobile'
-    compileSdk 36
-    ndkVersion '28.2.13676358'
+    namespace = 'cn.crossdesk.mobile'
+    compileSdk = 36
+    ndkVersion = '28.2.13676358'
     defaultConfig {
-        applicationId 'cn.crossdesk.mobile'
-        minSdk 26
-        targetSdk 36
-        versionCode providers.gradleProperty('crossdeskVersionCode').get().toInteger()
-        versionName providers.gradleProperty('crossdeskVersionName').get()
+        applicationId = 'cn.crossdesk.mobile'
+        minSdk = 26
+        targetSdk = 36
+        versionCode = providers.gradleProperty('crossdeskVersionCode').get().toInteger()
+        versionName = providers.gradleProperty('crossdeskVersionName').get()
         ndk { abiFilters 'arm64-v8a' }
-        testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
+        testInstrumentationRunner = 'androidx.test.runner.AndroidJUnitRunner'
     }
     compileOptions {
-        sourceCompatibility JavaVersion.VERSION_17
-        targetCompatibility JavaVersion.VERSION_17
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
     }
     sourceSets.main.jniLibs.srcDirs = [layout.buildDirectory.dir('native')]
     sourceSets.main.assets.srcDirs += [layout.buildDirectory.dir('generated/notices')]
     sourceSets.androidTest.java.srcDirs = ['../test/android/java']
     sourceSets.androidTest.assets.srcDirs = ['../test/android/assets']
-    buildTypes.release { minifyEnabled false }
+    buildTypes.release { minifyEnabled = false }
     packaging.jniLibs.useLegacyPackaging = false
 }
 

apps/android/app/src/main/java/cn/crossdesk/mobile/MainActivity.java

@@ -118,6 +118,9 @@ public final class MainActivity extends Activity implements NativeSession.Listen
     private String serverKey(){return host+":"+port;}
     private void toast(String value){Toast.makeText(this,value,Toast.LENGTH_SHORT).show();}
     private void hideKeyboard(){((InputMethodManager)getSystemService(INPUT_METHOD_SERVICE)).hideSoftInputFromWindow(root.getWindowToken(),0);root.clearFocus();}
+    // Legacy inset handling also includes the IME on non-session pages. The
+    // decor-fitting call below is restricted to Android 11–14.
+    @SuppressWarnings("deprecation")
     private void installRoot(String nextPage,boolean dark){
         PageHost.Motion motion=PageHost.Motion.NONE;
         if(canvas!=null&&foreground&&!page.equals(nextPage)){
@@ -147,6 +150,8 @@ public final class MainActivity extends Activity implements NativeSession.Listen
         root.setFocusableInTouchMode(true);pageHost.show(canvas,motion);
         applySystemBars(dark);
     }
+    // Android 8–10 require system UI flags instead of WindowInsetsController.
+    @SuppressWarnings("deprecation")
     private void applySystemBars(boolean dark){
         if(android.os.Build.VERSION.SDK_INT>=30){
             android.view.WindowInsetsController controller=getWindow().getInsetsController();
@@ -302,7 +307,9 @@ public final class MainActivity extends Activity implements NativeSession.Listen
             rememberPassword=remember.isChecked();password.setText("");dialog.dismiss();begin(id,secret);
         });connect.setContentDescription(L10n.tr("确认连接"));sheet.addView(connect,ui.size(-1,48));
         ScrollView scroll=new ScrollView(this);scroll.addView(sheet);
-        dialog.setContentView(scroll);Window window=dialog.getWindow();if(window!=null){window.setBackgroundDrawableResource(android.R.color.transparent);window.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);window.setDimAmount(.22f);}dialog.show();sizePasswordDialog();password.requestFocus();if(!error.isEmpty())password.setError(error);
+        // This floating dialog uses window-managed IME resizing on all supported APIs.
+        @SuppressWarnings("deprecation") int resizeMode=WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE;
+        dialog.setContentView(scroll);Window window=dialog.getWindow();if(window!=null){window.setBackgroundDrawableResource(android.R.color.transparent);window.setSoftInputMode(resizeMode);window.setDimAmount(.22f);}dialog.show();sizePasswordDialog();password.requestFocus();if(!error.isEmpty())password.setError(error);
         dialog.setOnDismissListener(d->{password.setText("");passwordDialog=null;});
     }
     private void sizePasswordDialog(){
@@ -715,6 +722,8 @@ public final class MainActivity extends Activity implements NativeSession.Listen
     private void navigateBack(){if(backAction==null)return;navigatingBack=true;try{backAction.run();}finally{navigatingBack=false;}}
     private void back(){if(controls!=null&&controls.closeKeyboard())return;pageHost.finish();if(session!=null){if(ready)confirmDisconnect();else end("");}else if(backAction!=null)navigateBack();else finish();}
     @Override public void onWindowFocusChanged(boolean focus){super.onWindowFocusChanged(focus);if(!focus)releaseKeys();else applySystemBars(ready);}
+    // API 26–32 use this callback; API 33+ registers OnBackInvokedCallback in onCreate.
+    @SuppressWarnings("deprecation")
     @android.annotation.SuppressLint("GestureBackNavigation") @Override public void onBackPressed(){back();}
     @Override public void onConfigurationChanged(Configuration config){
         super.onConfigurationChanged(config);

apps/android/app/src/main/java/cn/crossdesk/mobile/MobileUi.java

@@ -90,6 +90,8 @@ final class MobileUi {
         }
         @Override public void setAlpha(int alpha) { bitmapPaint.setAlpha(alpha);invalidateSelf(); }
         @Override public void setColorFilter(ColorFilter filter) { bitmapPaint.setColorFilter(filter);invalidateSelf(); }
+        // Drawable still requires this abstract method, including on API 26.
+        @SuppressWarnings("deprecation")
         @Override public int getOpacity() { return PixelFormat.TRANSLUCENT; }
     }
     @android.annotation.SuppressLint("ViewConstructor") // Programmatic icon primitive, not inflated from XML.