应用程序启动，主要活动显示带有图像的欢迎屏幕（没有什么特别之处），然后被重新定向到地图活动。这就是一切都出错的地方。如果我从Android Studio运行应用程序，那一切都很好。显示地图，它放大我的位置，我可以点击地图并添加标记，我可以拖动标记等。即使我销毁应用程序并清除缓存并启动应用程序（这次通过没有从Android Studio启动它的设备）它工作得很好。问题是当我重启设备并尝试运行该应用程序时。它显示了主要活动的欢迎图像，但是当显示地图活动时，除了显示世界地图之外，它根本不做任何事情。我无法mapclick，它不会像我编程那样放大。它什么都不做。
我尝试更新Google APP Key，更改了应用位置提供商，但没有做任何事情。我尝试在系统设置中清理数据和缓存，它运行正常。
MapaActivity.java
public class MapaActivity extends Activity implements LocationListener{
private final String TAG = "MapaActivity";
private ArrayList<Bitmap> FotoLista = new ArrayList<>();
//private ArrayList<String> ScreenShot = new ArrayList<>();
private ArrayList<String> fotos_caminho;
private Uri imageUri;
private String _Location;
private Bitmap bitmap_screen;
private boolean isMarkerChecked;
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute
//String caminho_screen;
//Button botao;
GoogleMap googleMap;
// Get the LocationManager object from the System Service LOCATION_SERVICE
LocationManager locationManager;
// Create a criteria object needed to retrieve the provider
Criteria criteria;
// Get the name of the best available provider
String provider;
LatLng ponto;
LatLng currentPosition;
private Custom_Dialog dialog;
// We can use the provider immediately to get the last known location
Location location;
double latitude; // latitude
double longitude; // longitude
Marker m;
// request that the provider send this activity GPS updates every 20 seconds
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout_mapa);
isMarkerChecked = false;
fotos_caminho = new ArrayList<String>();
//botao = (Button) findViewById(R.id.confirmar_local);
turnOnDataConnection(true,this);
// Get the LocationManager object from the System Service LOCATION_SERVICE
LocationManager locationManager = (LocationManager)
getSystemService(LOCATION_SERVICE);
// Create a criteria object needed to retrieve the provider
criteria = new Criteria();
// Get the name of the best available provider
provider = locationManager.GPS_PROVIDER;
// We can use the provider immediately to get the last known location
//location = new Location(provider);
location = locationManager.getLastKnownLocation(provider);
// Log.e(TAG, "location: " +location.getLatitude()+"lon:"+location.getLongitude());
// request that the provider send this activity GPS updates every 20 seconds
locationManager.requestLocationUpdates(provider, 20000, 0, this);
createMapView(location);
}
public void tirafoto_func(View v){
Intent intentFoto = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File photo = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "foto_0.png");
imageUri = Uri.fromFile(photo);
intentFoto.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
startActivityForResult(intentFoto, 0);
}
//Para tratar o output da camera
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(resultCode == RESULT_OK) {
if (requestCode == 0) {
File f = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES)
.toString());
for (File temp : f.listFiles()) {
if (temp.getName().equals("foto_0.png")) {
f = temp;
break;
}
}
try {
String fname=new File(f.getPath()).getAbsolutePath();
fotos_caminho.add(fname);
} catch (Exception e) {
e.printStackTrace();
}
}
}
if (resultCode == RESULT_CANCELED)
{
return;
}
inicia_Form();
}
public static Bitmap scaleDownBitmap(Bitmap realImage, float maxImageSize,
boolean filter) {
float ratio = Math.min(
(float) maxImageSize / realImage.getWidth(),
(float) maxImageSize / realImage.getHeight());
int width = Math.round((float) ratio * realImage.getWidth());
int height = Math.round((float) ratio * realImage.getHeight());
Bitmap newBitmap = Bitmap.createScaledBitmap(realImage, width,
height, filter);
return newBitmap;
}
public void inicia_Form(){
Intent intent = new Intent(MapaActivity.this, Form_ocorrencia.class);
intent.putExtra("objecto", FotoLista);
//intent.putExtra("screen", caminho_screen);
intent.putStringArrayListExtra("caminho_1",fotos_caminho);
intent.putExtra("long", currentPosition.longitude);
intent.putExtra("lat", currentPosition.latitude);
MapaActivity.this.startActivity(intent);
finish();
}
private void createMapView(Location local) {
try {
if (null == googleMap) {
googleMap = ((MapFragment) getFragmentManager().findFragmentById(
R.id.map)).getMap();
Toast.makeText(getApplicationContext(),
"Criei mapa", Toast.LENGTH_SHORT).show();
googleMap.setMyLocationEnabled(true);
System.err.println("Location Enabled");
googleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
// googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
// myMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
// myMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
System.err.println("set map type");
location = local;
System.err.println("location"+location.getLongitude());
CameraUpdate center =
CameraUpdateFactory.newLatLng(new LatLng(location.getLatitude(),
location.getLongitude()));
System.err.println("Camera Update");
CameraUpdate zoom = CameraUpdateFactory.zoomTo(22);
System.err.println("Camera Zoom");
googleMap.moveCamera(center);
System.err.println("Camera Move");
googleMap.animateCamera(zoom);
System.err.println("Camera Animate");
CameraPosition cp = new CameraPosition.Builder()
.target(new LatLng(local.getLatitude(), local.getLongitude()))
.zoom(18)
.build();
googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(cp));
googleMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
@Override
public void onMapClick(LatLng pont){
drawMarker(location, pont);
}
});
googleMap.setOnMarkerDragListener(new GoogleMap.OnMarkerDragListener() {
@Override
public void onMarkerDragStart(Marker marker) {
System.err.println("Tou a arrastar");
}
@Override
public void onMarkerDrag(Marker marker) {
}
@Override
public void onMarkerDragEnd(Marker marker) {
currentPosition = marker.getPosition();
drawMarker(location, currentPosition);
}
});
googleMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {
@Override
public boolean onMarkerClick(Marker marker) {
mostra_dialog(getApplicationContext());
return false;
}
});
/**
* If the map is still null after attempted initialisation,
* show an error to the user
*/
if (null == googleMap) {
Toast.makeText(getApplicationContext(),
"Erro ao criar mapa", Toast.LENGTH_SHORT).show();
}
}
} catch (NullPointerException exception) {
Log.e("mapApp", exception.toString());
}
}
private void drawMarker(Location location, LatLng ponto){
googleMap.clear();
// convert the location object to a LatLng object that can be used by the map API
currentPosition = new LatLng(location.getLatitude(),
location.getLongitude());
// zoom to the current location
googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(currentPosition,
18));
// add a marker to the map indicating our current position
System.err.println("vou adicionar");
if (googleMap !=null) {
m = googleMap.addMarker(new MarkerOptions()
.position(currentPosition)
.snippet("Lat:" + location.getLatitude() + "Lng:" + location.getLongitude())
.draggable(true));
m.setDraggable(true);
m.setIcon(BitmapDescriptorFactory.fromResource(R.drawable.icon_marker_v2_2));
}
isMarkerChecked = true;
System.err.println("MarkerChecked");
searches_location(ponto);
mostra_dialog(getApplicationContext());
}
int bv = Build.VERSION.SDK_INT;
boolean turnOnDataConnection(boolean ON,Context context)
{
try{
if(bv == Build.VERSION_CODES.FROYO)
{
Method dataConnSwitchmethod;
Class<?> telephonyManagerClass;
Object ITelephonyStub;
Class<?> ITelephonyClass;
TelephonyManager telephonyManager = (TelephonyManager) context
.getSystemService(Context.TELEPHONY_SERVICE);
telephonyManagerClass = Class.forName(telephonyManager.getClass().getName());
Method getITelephonyMethod = telephonyManagerClass.getDeclaredMethod("getITelephony");
getITelephonyMethod.setAccessible(true);
ITelephonyStub = getITelephonyMethod.invoke(telephonyManager);
ITelephonyClass = Class.forName(ITelephonyStub.getClass().getName());
if (ON) {
dataConnSwitchmethod = ITelephonyClass
.getDeclaredMethod("enableDataConnectivity");
} else {
dataConnSwitchmethod = ITelephonyClass
.getDeclaredMethod("disableDataConnectivity");
}
dataConnSwitchmethod.setAccessible(true);
dataConnSwitchmethod.invoke(ITelephonyStub);
}
else
{
//log.i("App running on Ginger bread+");
final ConnectivityManager conman = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
final Class<?> conmanClass = Class.forName(conman.getClass().getName());
final Field iConnectivityManagerField = conmanClass.getDeclaredField("mService");
iConnectivityManagerField.setAccessible(true);
final Object iConnectivityManager = iConnectivityManagerField.get(conman);
final Class<?> iConnectivityManagerClass = Class.forName(iConnectivityManager.getClass().getName());
final Method setMobileDataEnabledMethod = iConnectivityManagerClass.getDeclaredMethod("setMobileDataEnabled", Boolean.TYPE);
setMobileDataEnabledMethod.setAccessible(true);
setMobileDataEnabledMethod.invoke(iConnectivityManager, ON);
}
return true;
}catch(Exception e){
Log.e(TAG,"error turning on/off data");
return false;
}
}
@Override
public void onLocationChanged(Location location_2) {
}
@Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
@Override
public void onProviderEnabled(String s) {
}
@Override
public void onProviderDisabled(String s) {
}
private void mostra_dialog(Context c)
{
dialog = new Custom_Dialog(this, R.style.omeuestilo_dialog);
dialog.setContentView(R.layout.custom_dialog);
dialog.setTitle("Confirmar Local");
Button ok = (Button) dialog.findViewById(R.id.ok);
Button cancelar = (Button) dialog.findViewById(R.id.cancel);
ok.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
tirafoto_func(v);
}
});
cancelar.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
}
});
searches_location(ponto);
TextView text = (TextView) dialog.findViewById(R.id.text);
text.setText("Longitude: " + location.getLongitude() + "\n" + "Latitude: " + location.getLatitude() + "\n" + "Rua: " + _Location);
WindowManager.LayoutParams wmlp = dialog.getWindow().getAttributes();
wmlp.gravity = Gravity.TOP | Gravity.RIGHT;
wmlp.x = 400; //x position
wmlp.y = 500; //y position
dialog.show();
}
public void searches_location(LatLng pont){
ponto = pont;
Log.e(TAG, "location_1: " +pont.latitude+"lon:"+pont.longitude);
googleMap.animateCamera(CameraUpdateFactory.newLatLng(ponto));
Toast.makeText(getApplicationContext(), "Marcado Local da Ocorrência!",
Toast.LENGTH_LONG).show();
googleMap.clear();
MarkerOptions m = new MarkerOptions().position(ponto).title(
ponto.toString());
googleMap.addMarker(new MarkerOptions()
.draggable(true)
.position(ponto).title(ponto.toString())).setIcon(BitmapDescriptorFactory.fromResource(R.drawable.icon_marker_v2_2));
location.setLatitude(ponto.latitude);
location.setLongitude(ponto.longitude);
Geocoder geocoder = new Geocoder(getApplicationContext(), Locale.getDefault());
try {
List<Address> listAddresses = geocoder.getFromLocation(ponto.latitude, ponto.longitude, 1);
if(null!=listAddresses&&listAddresses.size()>0){
_Location = listAddresses.get(0).getAddressLine(0);
// String Sub_Localidade = listAddresses.get(0).getSubLocality(); //Dá para ir buscar tipo Alto São João
//String Cidade = listAddresses.get(0).get
//DEPOIS TEM DE SE BOTAR NUMA EDIT TEXT
}
listAddresses.clear();
} catch (IOException e) {
e.printStackTrace();
System.err.println("Nao consegui obter rua!");
}
}
}
layout_mapa.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="110dp"
android:id="@+id/linear_top"
android:background="@color/gnr_verde_mais_claro"
android:weightSum="1"
android:paddingTop="5dp"
android:paddingLeft="10dp">
<ImageView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:id="@+id/imageView2"
android:src="@drawable/logo_v2"
android:layout_weight="0.09"
android:paddingLeft="-21dp"
android:paddingRight="-15dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/textView10"
android:text="GNReport | Introduza o Local da Ocorrência"
android:textSize="25dp"
android:paddingTop="35dp"
android:paddingLeft="0dp"
android:textColor="@color/branco" />
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="8dp"
android:background="@color/gnr_verde_mais_escuro"></LinearLayout>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="com.google.android.gms.maps.MapFragment"
android:id="@+id/map"
android:layout_alignParentTop="true"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true" />
</RelativeLayout>
</LinearLayout>
</RelativeLayout>
答案 0 :(得分：0)
这是一个位置问题。有时getLastKnownLocation方法返回null，因为它没有要检索的位置。您需要使用requestLocationUpdates方法，这将起作用！