java - while 循环中的 mapFrag.getMapAsync() 问题

Question

我确实需要帮助来解决我不知道如何解决的问题。我正在尝试为我父亲申请，我将与 Map 合作。该问题具体出现在 while 循环内的 mapFrag.getMapAsync() 中。

@Override
public void onResume(){
    super.onResume();
    new Thread(){
        public void run(){
            while ( mapFrag.getMapAsync() == null){
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e){
                    e.printStackTrace();
                }
            }
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    configMap();
                }
            });
        }
    }.start();
}

while (mapFrag.getMapAsync()，此行收到错误消息'

getMapAsync(OnMapReadyCallback) in SupportMapFragment cannot be applied to ()

OnMapReadyCallback 是在 MainActivity 上实现的。

Answer 1

根据 MapFragment.getMapAsync() 的文档:

public void getMapAsync (OnMapReadyCallback callback)

Sets a callback object which will be triggered when the GoogleMap instance is ready to be used.

Note that:

This method must be called from the main thread.

The callback will be executed in the main thread.

In the case where Google Play services is not installed on the user's device, the callback will not be triggered until the user installs it. In the rare case where the GoogleMap is destroyed immediately after creation, the callback is not triggered.

The GoogleMap object provided by the callback is non-null.

特别是这个:

Parameters callback The callback object that will be triggered when the map is ready to be used.

在您的调用 mapFrag.getMapAsync() 中，没有 OnMapReadyCallback 参数。因此，您应该添加它:

...
mapFrag.getMapAsync(new OnMapReadyCallback() {
    @Override
    public void onMapReady(GoogleMap googleMap) {
        googleMap.moveCamera(cameraUpdate);
    }
})
...

并且您不应该在单独的线程中调用 getMapAsync()，因为(请参阅上面的文档链接):

• 此方法必须从主线程调用。

• 回调将在主线程中执行。

所以，请仔细阅读官方Get Started页。