我正在尝试使用Android Studio构建一个使用Google地图活动的应用程序。
我面临的问题是：每当我尝试启动活动时，应用程序都会崩溃。当我使用带有SDK 24的模拟器时，活动启动，它需要我的许可，然后它给我一个身份验证错误，即使我放置了正确的API密钥。
在具有SDK 26的模拟器上，活动甚至不会启动，它会立即崩溃。
你能帮忙吗？
MapsActivity
import android.Manifest;
import android.content.pm.PackageManager;
import android.location.Location;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.Toast;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import java.util.ArrayList;
@SuppressWarnings("unchecked")
public class MapsActivity extends AppCompatActivity implements OnMapReadyCallback {
@Override
public void onMapReady(GoogleMap googleMap) {
Toast.makeText(this, "Map is Ready", Toast.LENGTH_SHORT).show();
Log.d(TAG, "onMapReady: map is ready");
mMap = googleMap;
if (mLocationPermissionsGranted) {
getDeviceLocation();
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
mMap.setMyLocationEnabled(true);
mMap.getUiSettings().setMyLocationButtonEnabled(false);
}
}
private static final String TAG = "MapsActivity";
private static final String FINE_LOCATION = Manifest.permission.ACCESS_FINE_LOCATION;
private static final String COURSE_LOCATION = Manifest.permission.ACCESS_COARSE_LOCATION;
private static final int LOCATION_PERMISSION_REQUEST_CODE = 1234;
private static final float DEFAULT_ZOOM = 15f;
//vars
private Boolean mLocationPermissionsGranted = false;
private GoogleMap mMap;
private FusedLocationProviderClient mFusedLocationProviderClient;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
getLocationPermission();
}
private void getDeviceLocation(){
Log.d(TAG, "getDeviceLocation: getting the devices current location");
mFusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this);
try{
if(mLocationPermissionsGranted){
final Task location = mFusedLocationProviderClient.getLastLocation();
location.addOnCompleteListener(new OnCompleteListener() {
@Override
public void onComplete(@NonNull Task task) {
if(task.isSuccessful()){
Log.d(TAG, "onComplete: found location!");
Location currentLocation = (Location) task.getResult();
moveCamera(new LatLng(currentLocation.getLatitude(), currentLocation.getLongitude()),
DEFAULT_ZOOM);
}else{
Log.d(TAG, "onComplete: current location is null");
Toast.makeText(MapsActivity.this, "unable to get current location", Toast.LENGTH_SHORT).show();
}
}
});
}
}catch (SecurityException e){
Log.e(TAG, "getDeviceLocation: SecurityException: " + e.getMessage() );
}
}
private void moveCamera(LatLng latLng, float zoom){
Log.d(TAG, "moveCamera: moving the camera to: lat: " + latLng.latitude + ", lng: " + latLng.longitude );
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, zoom));
}
private void initMap(){
Log.d(TAG, "initMap: initializing map");
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(MapsActivity.this);
}
private void getLocationPermission(){
Log.d(TAG, "getLocationPermission: getting location permissions");
String[] permissions = {Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.ACCESS_COARSE_LOCATION};
if(ContextCompat.checkSelfPermission(this.getApplicationContext(),
FINE_LOCATION) == PackageManager.PERMISSION_GRANTED){
if(ContextCompat.checkSelfPermission(this.getApplicationContext(),
COURSE_LOCATION) == PackageManager.PERMISSION_GRANTED){
mLocationPermissionsGranted = true;
initMap();
}else{
ActivityCompat.requestPermissions(this,
permissions,
LOCATION_PERMISSION_REQUEST_CODE);
}
}else{
ActivityCompat.requestPermissions(this,
permissions,
LOCATION_PERMISSION_REQUEST_CODE);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
Log.d(TAG, "onRequestPermissionsResult: called.");
mLocationPermissionsGranted = false;
switch(requestCode){
case LOCATION_PERMISSION_REQUEST_CODE:{
if(grantResults.length > 0){
for(int i = 0; i < grantResults.length; i++){
if(grantResults[i] != PackageManager.PERMISSION_GRANTED){
mLocationPermissionsGranted = false;
Log.d(TAG, "onRequestPermissionsResult: permission failed");
return;
}
}
Log.d(TAG, "onRequestPermissionsResult: permission granted");
mLocationPermissionsGranted = true;
//initialize our map
initMap();
}
}
}
}
}
带有SDK 24的模拟器的logcat出错：
06-21 16:52:53.625 13392-13392/com.example.raluca.geoloc.feature E/art: The String#value field is not present on Android versions >= 6.0
06-21 16:52:55.011 1314-1321/? E/SurfaceFlinger: ro.sf.lcd_density must be defined as a build property
06-21 16:52:55.452 13392-13560/com.example.raluca.geoloc.feature E/Google Maps Android API: Authorization failure. Please see https://developers.google.com/maps/documentation/android-api/start for how to correctly set up the map.
06-21 16:52:55.454 13392-13560/com.example.raluca.geoloc.feature E/Google Maps Android API: In the Google Developer Console (https://console.developers.google.com)
Ensure that the "Google Maps Android API v2" is enabled.
Ensure that the following Android Key exists:
API Key: XXX_Key
Android Application (<cert_fingerprint>;<package_name>): D3:DF:7B:C7:09:CA:00:9F:32:DD:93:98:D6:E2:09:A1:18:B1:F6:6B;com.example.raluca.geoloc.feature
06-21 16:53:01.866 13392-13392/com.example.raluca.geoloc.feature E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.raluca.geoloc.feature, PID: 13392
java.lang.RuntimeException: Failure delivering result ResultInfo{who=@android:requestPermissions:, request=1234, result=-1, data=Intent { act=android.content.pm.action.REQUEST_PERMISSIONS (has extras) }} to activity {com.example.raluca.geoloc.feature/com.example.raluca.geoloc.feature.MapsActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.maps.SupportMapFragment.getMapAsync(com.google.android.gms.maps.OnMapReadyCallback)' on a null object reference
at android.app.ActivityThread.deliverResults(ActivityThread.java:4053)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:4096)
at android.app.ActivityThread.-wrap20(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1516)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.maps.SupportMapFragment.getMapAsync(com.google.android.gms.maps.OnMapReadyCallback)' on a null object reference
at com.example.raluca.geoloc.feature.MapsActivity.initMap(MapsActivity.java:110)
at com.example.raluca.geoloc.feature.MapsActivity.onRequestPermissionsResult(MapsActivity.java:154)
at android.app.Activity.dispatchRequestPermissionsResult(Activity.java:7067)
at android.app.Activity.dispatchActivityResult(Activity.java:6919)
at android.app.ActivityThread.deliverResults(ActivityThread.java:4049)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:4096)
at android.app.ActivityThread.-wrap20(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1516)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)
06-21 16:53:02.076 1314-1322/? E/SurfaceFlinger: ro.sf.lcd_density must be defined as a build property
06-21 16:53:05.957 8187-8220/? E/InputDispatcher: channel '65bcf76 com.example.raluca.geoloc.feature/com.example.raluca.geoloc.feature.LoginActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
06-21 16:53:05.957 8187-8220/? E/InputDispatcher: channel '23dfb3a com.example.raluca.geoloc.feature/com.example.raluca.geoloc.feature.MapsActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
06-21 16:53:26.978 8543-12462/? E/NetworkScheduler: Unrecognised action provided: android.intent.action.PACKAGE_REMOVED
06-21 16:53:27.653 8543-11730/? E/NetworkScheduler: Unrecognised action provided: android.intent.action.PACKAGE_REPLACED
06-21 16:53:28.495 8906-13710/? E/FontsPackageChangeOp: Error adding manifest dependency for newly downloaded font {Press Start 2P, wdth 100.0, wght 400, ital 0.0, bestEffort false}
06-21 16:53:28.507 8906-13053/? E/FontDisk: Error inserting metadata for Press Start 2P
java.lang.IllegalStateException: attempt to re-open an already-closed object: SQLiteDatabase: /data/user/0/com.google.android.gms/databases/metadata.db
at android.database.sqlite.SQLiteClosable.acquireReference(SQLiteClosable.java:55)
at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1442)
at vdo.run(Unknown Source)
at ovb.run(:com.google.android.gms@[email protected] (040700-197041431):27)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at pbc.run(:com.google.android.gms@[email protected] (040700-197041431))
at java.lang.Thread.run(Thread.java:761)
06-21 16:53:29.228 13637-13764/? E/art: The String#value field is not present on Android versions >= 6.0
06-21 16:53:29.611 13637-13764/? E/Finsky: [464] com.google.android.finsky.am.c.a(34): Unable to build selector: /storage/emulated/0/Download/marketenvs.csv (No such file or directory)
06-21 16:53:30.423 13637-13637/? E/Finsky: [1] com.google.android.finsky.wear.y.a(3): onConnectionFailed: ConnectionResult{statusCode=API_UNAVAILABLE, resolution=null, message=null}
06-21 16:53:35.484 13637-13828/? E/Finsky: [483] com.google.android.finsky.splitinstallservice.ad.a(3): Can't schedule deferred install. No modules found.
06-21 16:53:36.939 13637-13637/? E/Finsky: [1] com.google.android.finsky.wear.y.a(3): onConnectionFailed: ConnectionResult{statusCode=API_UNAVAILABLE, resolution=null, message=null}
06-21 16:53:37.759 13836-13836/? E/art: The String#value field is not present on Android versions >= 6.0
06-21 16:53:38.320 8906-8965/? E/AsyncOpDispatcher: Unable to get current module info in ModuleManager created with non-module Context
06-21 16:53:39.373 8543-13891/? E/BluetoothAdapter: Bluetooth binder is null
06-21 16:53:39.503 8543-13891/? E/GCoreUlr: java.lang.IllegalStateException: Missing location or location status: 3016643, -1, 3781840, 7160153
at awot.a(:com.google.android.gms@[email protected] (040700-197041431):387)
at awos.a(:com.google.android.gms@[email protected] (040700-197041431):12)
at awos.handleMessage(:com.google.android.gms@[email protected] (040700-197041431):7)
at oup.run(:com.google.android.gms@[email protected] (040700-197041431):6)
at ovb.run(:com.google.android.gms@[email protected] (040700-197041431):27)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at pbc.run(:com.google.android.gms@[email protected] (040700-197041431))
at java.lang.Thread.run(Thread.java:761)
06-21 16:53:40.868 12038-13901/? E/art: The String#value field is not present on Android versions >= 6.0
06-21 16:58:10.742 8543-13895/? E/BluetoothAdapter: Bluetooth binder is null
06-21 16:58:10.743 8543-13895/? E/GCoreUlr: java.lang.IllegalStateException: Missing location or location status: 3016643, -1, 3781840, 7431479
at awot.a(:com.google.android.gms@[email protected] (040700-197041431):387)
at awos.a(:com.google.android.gms@[email protected] (040700-197041431):12)
at awos.handleMessage(:com.google.android.gms@[email protected] (040700-197041431):7)
at oup.run(:com.google.android.gms@[email protected] (040700-197041431):6)
at ovb.run(:com.google.android.gms@[email protected] (040700-197041431):27)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at pbc.run(:com.google.android.gms@[email protected] (040700-197041431))
at java.lang.Thread.run(Thread.java:761)
06-21 17:07:17.957 8543-9125/? E/WakeLock: release without a matched acquire!
06-21 17:07:18.371 14053-14083/? E/SQLiteLog: (1) no such table: mmsconfig
06-21 17:07:18.376 14053-14083/? E/Babel_SMS: canonicalizeMccMnc: invalid mccmnc nullnull
带有SDK 26的模拟器的logcat出错：
06-21 17:13:05.646 1744-1775/system_process E/memtrack: Couldn't load memtrack module
06-21 17:13:14.440 1929-2545/com.android.systemui E/ResourcesManager: failed to add asset path /data/app/com.example.raluca.geoloc.feature-sqq-lfGT9yN1ITtLhodWNA==/base.apk
06-21 17:13:14.440 1929-2545/com.android.systemui E/ResourcesManager: failed to add asset path /data/app/com.example.raluca.geoloc.feature-sqq-lfGT9yN1ITtLhodWNA==/base.apk
06-21 17:13:14.441 1929-2545/com.android.systemui E/ResourcesManager: failed to add asset path /data/app/com.example.raluca.geoloc.feature-sqq-lfGT9yN1ITtLhodWNA==/base.apk
06-21 17:13:14.441 1929-2545/com.android.systemui E/ResourcesManager: failed to add asset path /data/app/com.example.raluca.geoloc.feature-sqq-lfGT9yN1ITtLhodWNA==/base.apk
06-21 17:13:14.443 1929-2545/com.android.systemui E/ResourcesManager: failed to add asset path /data/app/com.example.raluca.geoloc.feature-sqq-lfGT9yN1ITtLhodWNA==/base.apk
06-21 17:13:14.899 1744-1775/system_process E/memtrack: Couldn't load memtrack module
06-21 17:13:15.787 5360-5360/com.example.raluca.geoloc.feature E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.raluca.geoloc.feature, PID: 5360
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.raluca.geoloc.feature/com.example.raluca.geoloc.feature.MapsActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.maps.SupportMapFragment.getMapAsync(com.google.android.gms.maps.OnMapReadyCallback)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.maps.SupportMapFragment.getMapAsync(com.google.android.gms.maps.OnMapReadyCallback)' on a null object reference
at com.example.raluca.geoloc.feature.MapsActivity.initMap(MapsActivity.java:110)
at com.example.raluca.geoloc.feature.MapsActivity.getLocationPermission(MapsActivity.java:123)
at com.example.raluca.geoloc.feature.MapsActivity.onCreate(MapsActivity.java:67)
at android.app.Activity.performCreate(Activity.java:6975)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
06-21 17:13:16.975 1510-1510/? E/AudioFlinger: not enough memory for AudioTrack size=131296
06-21 17:13:16.976 1510-1510/? E/AudioFlinger: createRecordTrack_l() initCheck failed -12; no control block?
06-21 17:13:16.978 2349-5365/com.google.android.googlequicksearchbox:search E/AudioRecord: AudioFlinger could not create record track, status: -12
06-21 17:13:16.990 2349-5365/com.google.android.googlequicksearchbox:search E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -12.
06-21 17:13:16.990 2349-5365/com.google.android.googlequicksearchbox:search E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object.
06-21 17:13:16.998 2349-5365/com.google.android.googlequicksearchbox:search E/ActivityThread: Failed to find provider info for com.google.android.apps.gsa.testing.ui.audio.recorded
06-21 17:13:17.682 2308-2853/com.google.android.gms.persistent E/ctxmgr: [ProducerStatusImpl]updateStateForNewContextData: inactive, contextName=7
06-21 17:13:17.794 2308-2308/com.google.android.gms.persistent E/BeaconBle: Missing BluetoothAdapter
06-21 17:13:17.895 2308-2308/com.google.android.gms.persistent E/BeaconBle: Scan couldn't start for Places
06-21 17:13:22.074 1510-1650/? E/AudioFlinger: not enough memory for AudioTrack size=131296
06-21 17:13:22.074 1510-1650/? E/AudioFlinger: createRecordTrack_l() initCheck failed -12; no control block?
06-21 17:13:22.074 2349-5365/com.google.android.googlequicksearchbox:search E/AudioRecord: AudioFlinger could not create record track, status: -12
06-21 17:13:22.084 2349-5365/com.google.android.googlequicksearchbox:search E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -12.
06-21 17:13:22.084 2349-5365/com.google.android.googlequicksearchbox:search E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object.
06-21 17:13:22.086 2349-5365/com.google.android.googlequicksearchbox:search E/ActivityThread: Failed to find provider info for com.google.android.apps.gsa.testing.ui.audio.recorded
06-21 17:13:27.115 1510-1648/? E/AudioFlinger: not enough memory for AudioTrack size=131296
06-21 17:13:27.116 1510-1648/? E/AudioFlinger: createRecordTrack_l() initCheck failed -12; no control block?
06-21 17:13:27.116 2349-5365/com.google.android.googlequicksearchbox:search E/AudioRecord: AudioFlinger could not create record track, status: -12
06-21 17:13:27.123 2349-5365/com.google.android.googlequicksearchbox:search E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -12.
06-21 17:13:27.124 2349-5365/com.google.android.googlequicksearchbox:search E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object.
06-21 17:13:27.714 1744-1775/system_process E/memtrack: Couldn't load memtrack module
06-21 17:13:27.737 1744-1775/system_process E/memtrack: Couldn't load memtrack module
06-21 17:13:31.070 1744-1775/system_process E/memtrack: Couldn't load memtrack module
06-21 17:13:31.084 1744-1775/system_process E/memtrack: Couldn't load memtrack module
06-21 17:13:32.154 1510-1650/? E/AudioFlinger: not enough memory for AudioTrack size=131296
06-21 17:13:32.155 1510-1650/? E/AudioFlinger: createRecordTrack_l() initCheck failed -12; no control block?
06-21 17:13:32.155 2349-5365/com.google.android.googlequicksearchbox:search E/AudioRecord: AudioFlinger could not create record track, status: -12
06-21 17:13:32.157 2349-5365/com.google.android.googlequicksearchbox:search E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -12.
06-21 17:13:32.157 2349-5365/com.google.android.googlequicksearchbox:search E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object.
Msps活动布局
<?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"
>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MapsActivity"
android:id="@+id/map"
class="com.google.android.gms.maps.SupportMapFragment"
/>
</RelativeLayout>
摇篮
android {
compileSdkVersion 26
defaultConfig {
minSdkVersion 15
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
debuggable true
}
}
}
dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation project(':base')
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation 'com.github.orhanobut:logger:1.12'
compile 'com.google.android.gms:play-services-maps:11.6.0'
implementation "com.google.android.gms:play-services-location:11.6.0"
}
你必须在onCreate（）中初始化你的地图就像在这里完成一样，这将完成你的工作。
public class MapsActivity extends AppCompatActivity implements OnMapReadyCallback
{
private GoogleMap mMap;
@Override
public void onMapReady(GoogleMap googleMap)
{
Toast.makeText(this, "Map is Ready", Toast.LENGTH_SHORT).show();
Log.d("Mapready", "onMapReady: map is ready");
mMap = googleMap;
if (mLocationPermissionsGranted)
{
getDeviceLocation();
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
mMap.setMyLocationEnabled(true);
mMap.getUiSettings().setMyLocationButtonEnabled(false);
}
}
private static final String TAG = "MapsActivity";
private static final String FINE_LOCATION = Manifest.permission.ACCESS_FINE_LOCATION;
private static final String COURSE_LOCATION = Manifest.permission.ACCESS_COARSE_LOCATION;
private static final int LOCATION_PERMISSION_REQUEST_CODE = 1234;
private static final float DEFAULT_ZOOM = 15f;
//vars
private Boolean mLocationPermissionsGranted = false;
private FusedLocationProviderClient mFusedLocationProviderClient;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
initMap();
getLocationPermission();
}
private void getDeviceLocation(){
Log.d(TAG, "getDeviceLocation: getting the devices current location");
mFusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this);
try{
if(mLocationPermissionsGranted){
final Task location = mFusedLocationProviderClient.getLastLocation();
location.addOnCompleteListener(new OnCompleteListener() {
@Override
public void onComplete(@NonNull Task task) {
if(task.isSuccessful()){
Log.d(TAG, "onComplete: found location!");
Location currentLocation = (Location) task.getResult();
moveCamera(new LatLng(currentLocation.getLatitude(), currentLocation.getLongitude()),
DEFAULT_ZOOM);
}else{
Log.d(TAG, "onComplete: current location is null");
Toast.makeText(MapsActivity.this, "unable to get current location", Toast.LENGTH_SHORT).show();
}
}
});
}
}catch (SecurityException e){
Log.e(TAG, "getDeviceLocation: SecurityException: " + e.getMessage() );
}
}
private void moveCamera(LatLng latLng, float zoom){
Log.d(TAG, "moveCamera: moving the camera to: lat: " + latLng.latitude + ", lng: " + latLng.longitude );
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, zoom));
}
private void initMap(){
Log.d(TAG, "initMap: initializing map");
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(MapsActivity.this);
}
private void getLocationPermission(){
Log.d(TAG, "getLocationPermission: getting location permissions");
String[] permissions = {Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.ACCESS_COARSE_LOCATION};
if(ContextCompat.checkSelfPermission(this.getApplicationContext(),
FINE_LOCATION) == PackageManager.PERMISSION_GRANTED){
if(ContextCompat.checkSelfPermission(this.getApplicationContext(),
COURSE_LOCATION) == PackageManager.PERMISSION_GRANTED){
mLocationPermissionsGranted = true;
initMap();
}else{
ActivityCompat.requestPermissions(this,
permissions,
LOCATION_PERMISSION_REQUEST_CODE);
}
}else{
ActivityCompat.requestPermissions(this,
permissions,
LOCATION_PERMISSION_REQUEST_CODE);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
Log.d(TAG, "onRequestPermissionsResult: called.");
mLocationPermissionsGranted = false;
switch(requestCode){
case LOCATION_PERMISSION_REQUEST_CODE:{
if(grantResults.length > 0){
for(int i = 0; i < grantResults.length; i++){
if(grantResults[i] != PackageManager.PERMISSION_GRANTED){
mLocationPermissionsGranted = false;
Log.d(TAG, "onRequestPermissionsResult: permission failed");
return;
}
}
Log.d(TAG, "onRequestPermissionsResult: permission granted");
mLocationPermissionsGranted = true;
//initialize our map
initMap();
}
}
}
}
}
另外，在清单文件中进行以下更改： -
<meta-data android:name="com.google.android.geo.API_KEY"
android:value="YOUR_API_KEY"/>