init

app/src/main/ets/appability/AppAbility.ets

@@ -0,0 +1,41 @@
+import { AbilityConstant, UIAbility, Want } from '@kit.AbilityKit';
+import { hilog } from '@kit.PerformanceAnalysisKit';
+import { window } from '@kit.ArkUI';
+
+export default class AppAbility extends UIAbility {
+  onCreate(want: Want, launchParam: AbilityConstant.LaunchParam): void {
+    hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onCreate');
+  }
+
+  onDestroy(): void {
+    hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onDestroy');
+  }
+
+  onWindowStageCreate(windowStage: window.WindowStage): void {
+    // Main window is created, set main page for this ability
+    hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onWindowStageCreate');
+
+    windowStage.loadContent('pages/Index', (err, data) => {
+      if (err.code) {
+        hilog.error(0x0000, 'testTag', 'Failed to load the content. Cause: %{public}s', JSON.stringify(err) ?? '');
+        return;
+      }
+      hilog.info(0x0000, 'testTag', 'Succeeded in loading the content. Data: %{public}s', JSON.stringify(data) ?? '');
+    });
+  }
+
+  onWindowStageDestroy(): void {
+    // Main window is destroyed, release UI related resources
+    hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onWindowStageDestroy');
+  }
+
+  onForeground(): void {
+    // Ability has brought to foreground
+    hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onForeground');
+  }
+
+  onBackground(): void {
+    // Ability has back to background
+    hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onBackground');
+  }
+}

app/src/main/ets/pages/Index.ets

@@ -0,0 +1,17 @@
+@Entry
+@Component
+struct Index {
+  @State message: string = 'Hello World';
+
+  build() {
+    Row() {
+      Column() {
+        Text(this.message)
+          .fontSize(50)
+          .fontWeight(FontWeight.Bold)
+      }
+      .width('100%')
+    }
+    .height('100%')
+  }
+}