fix: bind templates to MainActivity's lifecycle to prevent memory leaks

.idea/compiler.xml

@@ -131,4 +131,4 @@
       <module name="AndroidIDE.treesitter.test" target="1.7" />
     </bytecodeTargetLevel>
   </component>
-</project>
+</project>

app/src/main/java/com/itsaky/androidide/activities/MainActivity.kt

@@ -42,6 +42,7 @@ import com.itsaky.androidide.preferences.internal.confirmProjectOpen
 import com.itsaky.androidide.preferences.internal.lastOpenedProject
 import com.itsaky.androidide.projects.ProjectManager.projectPath
 import com.itsaky.androidide.resources.R.string
+import com.itsaky.androidide.templates.ITemplateProvider
 import com.itsaky.androidide.utils.DialogUtils
 import com.itsaky.androidide.utils.Environment
 import com.itsaky.androidide.utils.flashError
@@ -114,6 +115,18 @@ class MainActivity : IDEActivity() {
       this, /* onBackPressedCallback = */ onBackPressedCallback)
   }
 
+  override fun onStart() {
+    super.onStart()
+    ITemplateProvider.getInstance(reload = true)
+  }
+
+  override fun onStop() {
+    super.onStop()
+    if (ITemplateProvider.isLoaded()) {
+      ITemplateProvider.getInstance().clear()
+    }
+  }
+
   private fun onScreenChanged(screen: Int?) {
     val previous = viewModel.previousScreen
     if (previous != -1) {

templates-api/src/main/java/com/itsaky/androidide/templates/ITemplateProvider.kt

@@ -48,6 +48,12 @@ interface ITemplateProvider {
         .findFirstOrThrow()
         .also { provider = it }
     }
+
+    /**
+     * @return Whether the [ITemplateProvider] has been loaded or not.
+     */
+    @JvmStatic
+    fun isLoaded() = provider != null
   }
 
   /**
@@ -63,7 +69,7 @@ interface ITemplateProvider {
    * @param templateId The ID for the template.
    * @return The [Template] with the given [templateId] if any, or `null`.
    */
-  fun getTemplate(templateId: String) : Template<*>?
+  fun getTemplate(templateId: String): Template<*>?
 
   /**
    * Clear all the templates stored in the provider.

templates-api/src/main/java/com/itsaky/androidide/templates/parameters.kt

@@ -132,6 +132,12 @@ abstract class Parameter<T>(@StringRes val name: Int,
     }
   }
 
+  fun release() {
+    lock.withLock {
+      observers.clear()
+    }
+  }
+
   private fun notifyObservers() {
     lock.withLock {
       observers.forEach {

templates-api/src/main/java/com/itsaky/androidide/templates/template.kt

@@ -253,6 +253,10 @@ open class Template<R : TemplateRecipeResult>(
   open val parameters: Collection<Parameter<*>>
     get() = widgets.filterIsInstance<ParameterWidget<*>>().map { it.parameter }
 
+  open fun release() {
+    widgets.forEach { it.release() }
+  }
+
   companion object {
 
     @JvmStatic
@@ -260,11 +264,14 @@ open class Template<R : TemplateRecipeResult>(
   }
 }
 
-open class ProjectTemplate(
-  val moduleTemplates: List<Template<*>>, @StringRes templateName: Int,
-  @DrawableRes thumb: Int, @StringRes description: Int?,
-  widgets: List<Widget<*>>, recipe: TemplateRecipe<ProjectTemplateRecipeResult>
-) : Template<ProjectTemplateRecipeResult>(templateName, thumb, description, widgets, recipe) {
+open class ProjectTemplate(val moduleTemplates: List<Template<*>>,
+                           @StringRes templateName: Int,
+                           @DrawableRes thumb: Int,
+                           @StringRes description: Int?,
+                           widgets: List<Widget<*>>,
+                           recipe: TemplateRecipe<ProjectTemplateRecipeResult>
+) : Template<ProjectTemplateRecipeResult>(templateName, thumb, description,
+  widgets, recipe) {
 
   override val parameters: Collection<Parameter<*>>
     get() = if (moduleTemplates.isEmpty()) super.parameters else super.parameters.toMutableList()
@@ -286,6 +293,11 @@ open class ProjectTemplate(
         result
       }
     }
+
+  override fun release() {
+    super.release()
+    moduleTemplates.forEach { it.release() }
+  }
 }
 
 /**
@@ -293,24 +305,22 @@ open class ProjectTemplate(
  *
  * @property name The mdoule name (gradle format, e.g. ':app').
  */
-open class ModuleTemplate(val name: String,
-                                                          @StringRes
-                                                          templateName: Int,
-                                                          @DrawableRes
-                                                          thumb: Int, @StringRes
-                                                          description: Int?,
-                                                          widgets: List<Widget<*>>,
-                                                          recipe: TemplateRecipe<ModuleTemplateRecipeResult>
-) : Template<ModuleTemplateRecipeResult>(templateName, thumb, description, widgets, recipe)
+open class ModuleTemplate(val name: String, @StringRes templateName: Int,
+                          @DrawableRes thumb: Int, @StringRes description: Int?,
+                          widgets: List<Widget<*>>,
+                          recipe: TemplateRecipe<ModuleTemplateRecipeResult>
+) : Template<ModuleTemplateRecipeResult>(templateName, thumb, description,
+  widgets, recipe)
 
 /**
  * Template for creating a file.
  */
 open class FileTemplate<R : FileTemplateRecipeResult>(@StringRes name: Int,
-                                                  @DrawableRes thumb: Int,
-                                                  @StringRes description: Int?,
-                                                  widgets: List<Widget<*>>,
-                                                  recipe: TemplateRecipe<R>
+                                                      @DrawableRes thumb: Int,
+                                                      @StringRes
+                                                      description: Int?,
+                                                      widgets: List<Widget<*>>,
+                                                      recipe: TemplateRecipe<R>
 ) : Template<R>(name, thumb, description, widgets, recipe)
 
 /**

templates-api/src/main/java/com/itsaky/androidide/templates/widget.kt

@@ -22,12 +22,20 @@ package com.itsaky.androidide.templates
  *
  * Each template has a collection of widgets which is rendered when user selects a template.
  */
-interface Widget<T>
+interface Widget<T> {
+
+  fun release()
+}
 
 /**
  * Widget for the given [parameter].
  */
-sealed class ParameterWidget<T>(val parameter: Parameter<T>) : Widget<T>
+sealed class ParameterWidget<T>(val parameter: Parameter<T>) : Widget<T> {
+
+  override fun release() {
+    parameter.release()
+  }
+}
 
 /**
  * Widget for a [StringParameter]. Creates a text field for the parameter.

templates-impl/src/main/java/com/itsaky/androidide/templates/impl/TemplateProviderImpl.kt

@@ -66,6 +66,7 @@ class TemplateProviderImpl : ITemplateProvider {
   }
 
   override fun clear() {
+    templates.forEach { it.value.release() }
     templates.clear()
   }
 }