Android的地图加载很慢/不启动加载活动所有，直到点击它 [英] Android Map loading very slow/not loading at all in started activity until clicking on it

问题描述

在开始一个新的地图活动地图加载很慢，并且不启动加载，直到点击屏幕。

When starting a new map activity the map loads really slow and doesn't start the loading until clicking the screen.

布局如下：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context="com.example.android.momintuition.DirectionsActivity">

    <com.google.android.gms.maps.MapView
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:map="http://schemas.android.com/apk/res-auto"
        android:id="@+id/mapView"
        android:paddingTop="62px"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clickable="true"
        map:uiCompass="true"
        map:zOrderOnTop="true"
        map:uiZoomControls="true"
        android:background="#00000000" />
</RelativeLayout>

新的活动看起来是这样的：

The new activity looks like this:

public class DirectionsActivity extends AppCompatActivity implements OnMapReadyCallback {


    GoogleMap mMap; // Might be null if Google Play services APK is not available.

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_directions);
        MapView mv = (MapView) findViewById(R.id.mapView);
        mv.onCreate(savedInstanceState);
        mMap = mv.getMapAsync(this);

    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
         this.map = googleMap;
         CameraUpdate cameraUpdate =
                                CameraUpdateFactory.newLatLngZoom(new LatLng(43.1, -87.9), 10);
         map.animateCamera(cameraUpdate);
    }
}

我是新来的Andr​​oid。我缺少的东西吗？谢谢！

I am new to Android. Am I missing something? Thank you!

推荐答案

在这种情况下，问题是，我并没有实现下面的方法（即使是在文档中指定）：

The problem in this case was that I didn't implement the following methods(even if it was specified in the documentation):

@Override
    public void onResume() {
        mapView.onResume();
        super.onResume();
    }

    @Override
    public void onPause() {
        super.onPause();
        mapView.onPause();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        mapView.onDestroy();
    }

    @Override
    public void onLowMemory() {
        super.onLowMemory();
        mapView.onLowMemory();
    }

这是违反直觉我为什么这个方法可能会影响显示在地图上，但它确实解决问题。

It is counterintuitive to me why this methods might affect showing the map but it does fix the problem.

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