按钮的 OnClick 事件并不总是有效

Question

fragment_maps.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ui.MapsFragment">
    <fragment
        android:id="@+id/map"
        android:name="com.google.android.gms.maps.SupportMapFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
    <Button
        android:id="@+id/hello"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:focusable="true"
        android:text="Pickup Location">
    </Button>
</FrameLayout>

MapsFragment.java

我认为由于 SupportMapFragment 或 Framelayout 的 xml 实现不当，有时单击按钮工作有时不工作

       @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_maps, container,false);
            button = (Button) view.findViewById(R.id.hello);

            button.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Toast.makeText(getContext(),"Clicked",Toast.LENGTH_SHORT).show();
                }
            });

            location_permissions = new location_permissions(getContext());
            locationCallback = new LocationCallback();
            locationManager = (LocationManager) getContext().getSystemService(Context.LOCATION_SERVICE);
            fusedLocationClient = LocationServices.getFusedLocationProviderClient(getContext());
            locationRequest = LocationRequest.create();
            locationRequest.setInterval(10000);
            locationRequest.setFastestInterval(5000);
            locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
            LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder()
                    .addLocationRequest(locationRequest);
            SettingsClient client = LocationServices.getSettingsClient(getContext());
            mtask = client.checkLocationSettings(builder.build());
            supportMapFragment = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map);
            requestpermission();

            // google maps
            supportMapFragment.getMapAsync(new OnMapReadyCallback() {
                @Override
                public void onMapReady(GoogleMap googleMap) {
               // request GPS turn on if Gps is off
                    requestGPSCheck();
               // gets device current location & animate to current Latlong
                    callback();

                }
            });

            return view;
        }  

我在 Button OnClick 事件上设置了 Toast 消息，它总是不工作可能是由于焦点？

Answer 1

而不是使用

Toast.makeText(getContext(),"Clicked",Toast.LENGTH_SHORT).show();

尝试使用

Toast.makeText(getActivity().getApplicationContext(),"Clicked",Toast.LENGTH_SHORT).show();

getContext()使用当前视图作为上下文，因此如果尚未加载地图，则可能会导致上下文尚不可用。 getApplicationContext()使用应用程序的上下文，该上下文在加载此片段时已经可用。

试着让我知道。