更新1：我发现代码确实有效，但它并未要求获得使用您位置的权限。如果您转到应用程序权限并手动授予其位置访问权限，则可以正常运行。我仍然不知道如何让它在运行时询问位置权限。
我正在学习融合位置提供程序并制作了一个只显示lat和long的应用程序。我使用的是我的LG G4和6.0并遵循这个伟大的YouTube Tutorial，但是当我在手机上运行它时，它只显示纬度和长文本而不是gps坐标。我在Motorolla X 2015和Moto Droid Turbo上进行了测试，它可以工作。
编译SDK版本：7.0
Gradle版本：2.14.1
Android插件版本：2.2.0
构建工具版本：24.0.2
清单：
<?xml version = "1.0" encoding = "utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.nathan.gpstest">
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
</application>
</manifest>
Gradle Dependancies：
dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:24.2.1'
testCompile 'junit:junit:4.12'
//compile 'com.google.android.gms:play-services:9.6.1'
compile 'com.google.android.gms:play-services-location:9.6.1'
}
MainActivity：
package com.example.nathan.gpstest;
import android.content.pm.PackageManager;
import android.location.Location;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.FusedLocationProviderApi;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
public class MainActivity extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener {
TextView latitudeText;
TextView longitudeText;
private FusedLocationProviderApi locationProvider = LocationServices.FusedLocationApi;
private GoogleApiClient googleApiClient;
private LocationRequest locationRequest;
private double myLatitude;
private double mylongitude;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
latitudeText = (TextView) findViewById(R.id.tvLatitude);
longitudeText = (TextView) findViewById(R.id.tvLongitude);
googleApiClient = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
locationRequest = new LocationRequest();
locationRequest.setInterval(10 * 1000);
locationRequest.setFastestInterval(15 * 1000);
locationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
}
@Override
public void onConnected(Bundle bundle) {
requestLocationUpdates();
}
private void requestLocationUpdates() {
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, locationRequest, this);
}
@Override
public void onConnectionSuspended(int i) {
latitudeText.setText("Connection Suspended");
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
latitudeText.setText("Connection Failed");
}
@Override
public void onLocationChanged(Location location) {
myLatitude = location.getLatitude();
mylongitude = location.getLongitude();
latitudeText.setText("Latitude : " + String.valueOf(myLatitude));
//latitudeText.setText("Latitude : " + String.valueOf(myLatitude));
longitudeText.setText("Longitude : " + String.valueOf(mylongitude));
}
@Override
protected void onStart() {
super.onStart();
googleApiClient.connect();
}
@Override
protected void onResume() {
super.onResume();
if (googleApiClient.isConnected()) {
requestLocationUpdates();
}
}
@Override
protected void onPause() {
super.onPause();
LocationServices.FusedLocationApi.removeLocationUpdates(googleApiClient, this);
}
@Override
protected void onStop() {
super.onStop();
googleApiClient.disconnect();
}
}
答案 0 :(得分：0)
这可能与您的代码尚未处理的Android M中的新运行时权限有关，我之前有一个这样的案例，我的应用程序将在我的大多数设备中运行，但安装在新手机上时（使用Android 6.0+）它会崩溃。
原因是在运行时没有使用显式权限请求。
你可以尝试以下方法：
int currentapiVersion = android.os.Build.VERSION.SDK_INT;
int permissionCheck = ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION);
Bundle tmpSavedInstanceState = savedInstanceState;
// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.ACCESS_FINE_LOCATION)) {
// Show an expanation to the user *asynchronously* -- don't block
// this thread waiting for the user's response! After the user
// sees the explanation, try again to request the permission.
Toast.makeText(this, "Please accept the permission so you can use the location services", Toast.LENGTH_LONG).show();
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERM_REQUEST);
} else {
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERM_REQUEST);
// MY_PERM_REQUEST is an
// app-defined int constant. The callback method gets the
// result of the request.
}
if (permissionCheck == PackageManager.PERMISSION_GRANTED || currentapiVersion <= Build.VERSION_CODES.M) {
//Execute location service call if user has explicitly granted ACCESS_FINE_LOCATION..
// use location services
}
异步权限＆＃39;请求将返回调用此回调：
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case MY_PERM_REQUEST: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
//do whatever you want with your location API
// everything went well, use the location services
} else {
// permission denied. Disable the
// functionality that depends on this permission.
}
return;
}
// other 'case' lines to check for other
// permissions this app might request
}
}
您还可以查看@Blackkara提到的documentation
请告诉我这是否有帮助=）