NativeScript / NativeScript/plugins

[@nativescript/google-maps] CameraUpdate.fromCameraPosition causes NullPointerException: CameraPosition must not be null

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主要语言
TypeScript
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描述

On Android, using GoogleMaps.CameraUpdate.fromCameraPosition() to update the map's camera, especially when including bearing, results in a java.lang.NullPointerException from the native Google Maps SDK.

Steps to Reproduce

  • Set up a blank nativescript-vue project

  • Initialize a nativescript/google-maps MapView.

  • Attempt to create a CameraUpdate using GoogleMaps.CameraUpdate.fromCameraPosition() with a valid CameraPosition object.

import * as GoogleMaps from '@nativescript/google-maps';

// Assume 'map' is an initialized GoogleMaps.GoogleMap instance
// Assume 'map.cameraPosition' has valid data.
// Assume 'newHeading' is a valid number (e.g., from device orientation).

const newCameraPosition: GoogleMaps.CameraPosition = {
    target: map.cameraPosition.target,
    zoom: map.cameraPosition.zoom,
    tilt: map.cameraPosition.tilt,
    bearing: newHeading, // Or any valid number, e.g., 20
};

console.log('Input newCameraPosition:', JSON.stringify(newCameraPosition)); // This logs a valid object

try {
    const cameraUpdate = GoogleMaps.CameraUpdate.fromCameraPosition(newCameraPosition);
    // This line below is never reached
    console.log('CameraUpdate created successfully.'); 
} catch (e: any) {
    console.error("Error creating CameraUpdate:", e);
    if (global.isAndroid && e.nativeException) {
        console.error("Native Android Exception:", e.nativeException);
    }
}

Observed Error :

Error creating CameraUpdate fromCameraPosition: Error: java.lang.NullPointerException: cameraPosition must not be null
Native Android Exception during CameraUpdate creation: java.lang.NullPointerException: cameraPosition must not be null

Context & Impact :

  • The newCameraPosition JavaScript object supplied to fromCameraPosition is confirmed to be valid (no null, undefined, or NaN values).

  • This specific NullPointerException indicates an issue in the plugin's native bridge when converting the JavaScript CameraPosition object for fromCameraPosition.

  • As per the plugin's CameraUpdate API, fromCameraPosition is the only method that allows for setting the bearing alongside other camera parameters.

  • This bug currently prevents any programmatic control over the map's bearing, which is critical for features like compass-oriented maps.

Environment

  • nativescript-vue: "3.0.1"
  • @nativescript/google-maps : "1.8.0"
  • Platform: Android
  • Device Model: emulated Pixel 4 but also on hardware

贡献指南

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从这里开始

  1. 先读完整个 Issue,再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

调研方向

从 CameraUpdate.fromCameraPosition 的 Android 实现开始,并使用此 issue 中的 TypeScript 示例复现该故障。跟踪所提供的 CameraPosition 通过 native bridge 的转换过程;当能够创建有效的 CameraUpdate 且不发生 NullPointerException 时即表示完成,包括设置 bearing 的情况。

由索引模型根据 Issue 内容生成。

评估

技术栈
android, typescript
领域
mobile
Issue 类型
缺陷
难度
3/5
预计耗时
1-2 天
活跃度
停滞
描述清晰度
基本清楚
新手友好度
42/100

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