Question

我在项目中使用Tab布局。选项卡片段之一应显示世界地图。我的应用程序与Google Map API集成在一起，我使用ViewPager设置适配器。以下是活动。

public class HomeActivity extends AppCompatActivity {

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

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    // Get the ViewPager and set it's PagerAdapter so that it can display items
    ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
    PagerAdapter pagerAdapter =
            new PagerAdapter(getSupportFragmentManager(), HomeActivity.this);
    viewPager.setAdapter(pagerAdapter);

    // Give the TabLayout the ViewPager
    TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
    tabLayout.setupWithViewPager(viewPager);

    // Iterate over all tabs and set the custom view
    for (int i = 0; i < tabLayout.getTabCount(); i++) {
        TabLayout.Tab tab = tabLayout.getTabAt(i);
        tab.setCustomView(pagerAdapter.getTabView(i));
    }
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_home, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();

    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

class PagerAdapter extends FragmentPagerAdapter {

    String tabTitles[] = new String[] { "Cloud", "Home", "Report" };
    Context context;

    public PagerAdapter(FragmentManager fm, HomeActivity context) {
        super(fm);
        this.context = context;
    }

    @Override
    public int getCount() {
        return tabTitles.length;
    }

    @Override
    public Fragment getItem(int position) {

        switch (position) {
            case 0:
                return new MapFragment();
            case 1:
                return new OneFragment();
            case 2:
                return new TwoFragment();
        }

        return null;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        // Generate title based on item position
        return tabTitles[position];
    }

    public View getTabView(int position) {
        View tab = LayoutInflater.from(HomeActivity.this).inflate(R.layout.custom_tab, null);
        TextView tv = (TextView) tab.findViewById(R.id.custom_text);
        tv.setText(tabTitles[position]);
        return tab;
    }

}

    }

我的片段是

public class MapFragment extends Fragment  {

private MapView mMapView;

private GoogleMap mMap;

View view;


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    view = inflater.inflate(R.layout.fragment_map, null, false);
    mMapView = (MapView) view.findViewById(R.id.mapView);
    mMapView.onCreate(savedInstanceState);
    mMapView.onResume();
    try {
        MapsInitializer.initialize(getActivity().getApplicationContext());
    } catch (Exception e) {
        e.printStackTrace();
    }

    mMapView.getMapAsync(new OnMapReadyCallback() {

        @Override
        public void onMapReady(GoogleMap googleMap) {
            mMap = googleMap;

            // Add a marker in Sydney and move the camera
            LatLng sydney = new LatLng(-34, 151);
            mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
            mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
            mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
                @Override
                public void onMapClick(LatLng latLng) {

                    Toast.makeText(
                            getActivity(),
                            "Lat : " + latLng.latitude + " , "
                                    + "Long : " + latLng.longitude,
                            Toast.LENGTH_SHORT).show();

                }
             });

            if (mMap == null) {
                mMapView = (MapView) view.findViewById(R.id.mapView);
                mMapView.onCreate(getArguments());
                mMapView.onResume();

                try {
                    MapsInitializer.initialize(getActivity());
                    mMapView.getMapAsync(new OnMapReadyCallback() {
                        @Override
                        public void onMapReady(GoogleMap gmap) {
                            mMap = gmap;
                            mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);

                            //fill markers
                            //add marker listener

                        }
                    });



                } catch (Exception e) {
                    e.printStackTrace();
                }

            }

         }

    });
    return view;
}

    @Override
    public void onResume(){
        super.onResume();
        mMapView.onResume();
    }
    @Override
    public void onPause(){
        super.onPause();
        mMapView.onPause();
    }
    @Override
    public void onDestroy(){
        super.onDestroy();
        mMapView.onDestroy();
    }

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


}

我的应用程序成功运行。在第一个标签中，可以加载片段，并且在单击屏幕时也可以查看纬度和经度值。但看不到谷歌地图。在图片下方共享。相同的代码在单独的活动中运行良好。请帮助找到我错过的补充。 screenshot

Answer 1

我已通过为Google Map API生成新密钥并在清单文件中对其进行更新来解决此问题。现在，我可以在我的一个标签片段中看到Google地图，并与其他片段完美地结合在一起。

Google地图未显示在标签片段中

1 个答案: