Android -地图-我的位置按钮不工作，蓝点不显示

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
    ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_LOCATION_PERMISSION);
}

implementation 'com.google.android.gms:play-services-maps:17.0.0'

<fragment
    android:id="@+id/map_fragment"
    android:name="com.google.android.gms.maps.SupportMapFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map_fragment);
mapFragment.getMapAsync(new OnMapReadyCallback() {
    @Override
    public void onMapReady(GoogleMap googleMap) {
        // 在地图准备就绪后进行操作
    }
});