java - 谷歌地图不显示

Question

我正在制作一个显示谷歌地图的应用程序，但问题是:它不显示 map /卫星/任何东西。这只是一个很大的灰色地带。我已经添加了互联网权限以及图书馆和谷歌地图 API key ，我该如何解决这个问题？？？我正在使用的代码:

MapTabView.java:

public class MapTabView extends MapActivity implements OnClickListener {
public static final String TAG = "GoogleMapsActivity";
private MapView mapView;
private LocationManager locationManager;
Geocoder geocoder;
Location location;
LocationListener locationListener;
CountDownTimer locationtimer;
MapController mapController;
MapOverlay mapOverlay = new MapOverlay();
EditText SearchInput;
Button SearchButton;

@Override
protected void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.main);
    onTabStart();
    initComponents();
    mapView.setBuiltInZoomControls(true);
    mapView.setSatellite(true);
    mapController = mapView.getController();
    mapController.setZoom(16);
    locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
    if (locationManager == null) {
        Toast.makeText(MapTabView.this,
                "Location Manager Not Available", Toast.LENGTH_SHORT)
                .show();
        return;
    }
    location = locationManager
            .getLastKnownLocation(LocationManager.GPS_PROVIDER);
    if (location == null)
        location = locationManager
                .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
    if (location != null) {
        double lat = location.getLatitude();
        double lng = location.getLongitude();
        Toast.makeText(MapTabView.this,
                "Location Are" + lat + ":" + lng, Toast.LENGTH_SHORT)
                .show();
        GeoPoint point = new GeoPoint((int) (lat * 1E6), (int) (lng * 1E6));
        mapController.animateTo(point, new Message());
        mapOverlay.setPointToDraw(point);
        List<Overlay> listOfOverlays = mapView.getOverlays();
        listOfOverlays.clear();
        listOfOverlays.add(mapOverlay);
    }
    locationListener = new LocationListener() {
        @Override
        public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
        }

        @Override
        public void onProviderEnabled(String arg0) {
        }

        @Override
        public void onProviderDisabled(String arg0) {
        }

        @Override
        public void onLocationChanged(Location l) {
            location = l;
            locationManager.removeUpdates(this);
            if (l.getLatitude() == 0 || l.getLongitude() == 0) {
            } else {
                double lat = l.getLatitude();
                double lng = l.getLongitude();
                Toast.makeText(MapTabView.this,
                        "Location Are" + lat + ":" + lng,
                        Toast.LENGTH_SHORT).show();
            }
        }
    };
    if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER))
        locationManager.requestLocationUpdates(
                LocationManager.GPS_PROVIDER, 1000, 10f, locationListener);
    locationManager.requestLocationUpdates(
            LocationManager.NETWORK_PROVIDER, 1000, 10f, locationListener);
    locationtimer = new CountDownTimer(30000, 5000) {
        @Override
        public void onTick(long millisUntilFinished) {
            if (location != null)
                locationtimer.cancel();
        }

        @Override
        public void onFinish() {
            if (location == null) {
            }
        }
    };
    locationtimer.start();
}

private void onTabStart() {
    // TODO Auto-generated method stub
    TabHost tabHost=(TabHost)findViewById(R.id.tabHost);
    tabHost.setup();

    TabSpec spec2=tabHost.newTabSpec("Tab 1");
    spec2.setIndicator("Map");
    spec2.setContent(R.id.tab1);

    TabSpec spec3=tabHost.newTabSpec("Tab 2");
    spec3.setIndicator("Search");
    spec3.setContent(R.id.tab2);

    tabHost.addTab(spec2);
    tabHost.addTab(spec3);
    tabHost.setCurrentTab(1);
    SearchButton = (Button)findViewById(R.id.SearchButton);
    SearchButton.setOnClickListener(this);

}
public void onClick(View src) {
    switch(src.getId()) {
    case R.id.SearchButton:
        SearchInput = (EditText)findViewById(R.id.SearchInput);
        String SearchInputText = "";
        SearchInputText = SearchInput.getText().toString();
        Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("geo:0,0q=" + SearchInputText));
        startActivity(intent);
        break;
    }
}

public MapView getMapView() {
    return this.mapView;
}

private void initComponents() {
    mapView = (MapView) findViewById(R.id.mapview);
}

@Override
protected boolean isRouteDisplayed() {
    return false;
}

class MapOverlay extends Overlay {
    private GeoPoint pointToDraw;

    public void setPointToDraw(GeoPoint point) {
        pointToDraw = point;
    }

    public GeoPoint getPointToDraw() {
        return pointToDraw;
    }

    @Override
    public boolean draw(Canvas canvas, MapView mapView, boolean shadow,
            long when) {
        super.draw(canvas, mapView, shadow);

        Point screenPts = new Point();
        mapView.getProjection().toPixels(pointToDraw, screenPts);

        Bitmap bmp = BitmapFactory.decodeResource(getResources(),
                R.drawable.pinblue);
        canvas.drawBitmap(bmp, screenPts.x, screenPts.y - 24, null);
        return true;
    }
}

}

主.xml:

<?xml version="1.0" encoding="utf-8"?>

<TabHost android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/tabHost"
xmlns:android="http://schemas.android.com/apk/res/android"
>
<TabWidget
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@android:id/tabs"
/>
 <FrameLayout
 android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@android:id/tabcontent"
 >



 <LinearLayout
     android:id="@+id/tab1"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:orientation="vertical"
     android:paddingTop="60px" >


     <TextView
         android:id="@+id/txt2"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:text="Map" />

     <com.google.android.maps.MapView
         android:id="@+id/mapview"
         android:layout_width="fill_parent"
         android:layout_height="match_parent"
         android:layout_weight="1.12"
         android:apiKey="09AeOreJeLtH579e3G74Icfle664gxXhbfh1O7Q"
         android:clickable="true" >
     </com.google.android.maps.MapView>
 </LinearLayout>


  <LinearLayout
      android:id="@+id/tab2"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:orientation="vertical"
      android:paddingTop="60px" >

 <TextView
     android:id="@+id/txt3"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:text="Search for gokart tracks" />

 <LinearLayout
     android:id="@+id/linearLayout1"
     android:layout_width="match_parent"
     android:layout_height="match_parent" >

     <EditText
         android:id="@+id/SearchInput"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_weight="10.05" >

         <requestFocus />
     </EditText>

     <Button
         android:id="@+id/SearchButton"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_weight="1"
         android:text="@android:string/search_go" />
 </LinearLayout>


 <TextView
     android:id="@+id/textView1"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:text="@string/GoogleMapOpenText" />

 </LinearLayout>

 </FrameLayout>

</TabHost>

Answer 1

每当我没有看到 Google map 时，它最终都会成为以下问题之一:

1. 我从错误的项目 keystore 中生成了我的散列，从而生成了 API key ——我使用一个 keystore 为应用程序签名，并使用另一个 keystore 生成了散列。
2. 我没有包含 API key
3. 我没有签署 APK 并将其安装到手机上进行测试。它必须是签名的 APK，否则将无法运行。

此外，您没有指定要用于测试的手机——我不认为它会在模拟器上运行，它必须是手机。