Azure Maps在Android屏幕旋转时重置的解决方法咨询

方法一：通过OnReady回调恢复地图状态 #

Android屏幕旋转时默认会重建Activity，Azure Maps控件会随之重新初始化，导致地图视角重置。可以通过保存地图相机状态，再在地图加载完成后（OnReady回调）恢复状态来解决：

1. 保存地图状态 #

在Activity的onSaveInstanceState方法中，捕获当前地图的相机参数并保存到Bundle：

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    AzureMapControl mapControl = findViewById(R.id.map_control);
    if (mapControl != null && mapControl.isMapLoaded()) {
        CameraPosition camera = mapControl.getMap().getCameraPosition();
        outState.putDouble("center_lat", camera.getCenter().getLatitude());
        outState.putDouble("center_lon", camera.getCenter().getLongitude());
        outState.putDouble("zoom", camera.getZoom());
        outState.putDouble("pitch", camera.getPitch());
        outState.putDouble("heading", camera.getHeading());
    }
}

2. 利用OnReady恢复状态 #

在Activity的onCreate方法中，设置地图的OnReady回调，待地图加载完成后读取保存的参数并恢复视角：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    AzureMapControl mapControl = findViewById(R.id.map_control);
    mapControl.setAzureMapsSubscriptionKey("你的Azure Maps密钥");

    mapControl.onReady(map -> {
        if (savedInstanceState != null) {
            double lat = savedInstanceState.getDouble("center_lat");
            double lon = savedInstanceState.getDouble("center_lon");
            double zoom = savedInstanceState.getDouble("zoom");
            double pitch = savedInstanceState.getDouble("pitch");
            double heading = savedInstanceState.getDouble("heading");

            CameraPosition restoredPos = new CameraPosition(
                    new LatLng(lat, lon),
                    zoom,
                    pitch,
                    heading
            );
            map.moveCamera(CameraUpdateFactory.newCameraPosition(restoredPos));
        }
    });
}

方法二：阻止Activity重建（可选） #

如果不想处理状态保存，可在AndroidManifest.xml中给目标Activity添加配置，让系统屏幕旋转时不重建Activity：

<activity
    android:name=".MainActivity"
    android:configChanges="orientation|screenSize">
    <!-- 其他配置项 -->
</activity>

注意：这种方式会跳过Activity的重建生命周期，若有依赖屏幕方向的逻辑，需在onConfigurationChanged方法中手动处理。

内容的提问来源于stack exchange，提问作者Francisco Torres