위도/경도 찾기가 작동하지 않음

Question

나는 위도/경도 검사기, 속도계, 고도계 작동을 위해 며칠 동안 노력했지만 아무것도 작동하지 않는 것 같습니다. Android의 기본 제공 위치 관리자 및 Google Play 서비스를 사용해 보았습니다. 이제 Google Play 서비스를 다시 사용하려고합니다. https://developer.android.com/training/location/retrieve-current.html#play-services

나는 현재 lat/lon (lastknownlocation에서)을 표시하려고합니다. 내 안드로이드 폰 (안드로이드 6, API 23)은 화면에 위도/경도 값을 표시하지 않습니다. 누구든지 도와 줄 수 있습니까? 아래

CODE :

MainActivity

package example.locationtracker; 

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.v7.app.AppCompatActivity; 
import android.widget.TextView; 

import com.google.android.gms.common.ConnectionResult; 
import com.google.android.gms.common.api.GoogleApiClient; 
import com.google.android.gms.common.api.GoogleApiClient.ConnectionCallbacks; 
import com.google.android.gms.common.api.GoogleApiClient.OnConnectionFailedListener; 
import com.google.android.gms.location.LocationServices; 

public class MainActivity extends AppCompatActivity implements ConnectionCallbacks, OnConnectionFailedListener { 

    TextView mLatitudeText; 
    TextView mLongitudeText; 

    GoogleApiClient mGoogleApiClient = null; 
    Location mLastLocation; 

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

     mLatitudeText = (TextView) findViewById(R.id.latitudeTextView); 
     mLongitudeText = (TextView) findViewById(R.id.longitudeTextView); 

     // Create an instance of GoogleAPIClient. 
     if (mGoogleApiClient == null) { 
      mGoogleApiClient = new GoogleApiClient.Builder(this) 
        .addConnectionCallbacks(this) 
        .addOnConnectionFailedListener(this) 
        .addApi(LocationServices.API) 
        .build(); 
     } 
    } 

    protected void onStart() { 
     mGoogleApiClient.connect(); 
     super.onStart(); 
    } 

    protected void onStop() { 
     mGoogleApiClient.disconnect(); 
     super.onStop(); 
    } 

    @Override 
    public void onConnected(@Nullable Bundle bundle) { 
     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) { 
      return; 
     } 

     mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient); 

     if (mLastLocation != null) { 
      mLatitudeText.setText(String.valueOf(mLastLocation.getLatitude())); 
      mLongitudeText.setText(String.valueOf(mLastLocation.getLongitude())); 
     } 
    } 

    @Override 
    public void onConnectionSuspended(int i) { 

    } 

    @Override 
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) { 

    } 
} 

Gradle을 모듈 : 응용 프로그램 :

apply plugin: 'com.android.application' 

android { 
    compileSdkVersion 26 
    buildToolsVersion "26.0.2" 
    defaultConfig { 
     applicationId "example.locationtracker" 
     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' 
     } 
    } 
} 

dependencies { 
    compile fileTree(dir: 'libs', include: ['*.jar']) 
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', { 
     exclude group: 'com.android.support', module: 'support-annotations' 
    }) 
    compile 'com.android.support:appcompat-v7:26.+' 
    compile 'com.android.support.constraint:constraint-layout:1.0.2' 
    testCompile 'junit:junit:4.12' 

    compile 'com.google.android.gms:play-services:11.4.2' 
} 

Gradle을 프로젝트 : LocationTracker :

// Top-level build file where you can add configuration options common to all sub-projects/modules. 

buildscript { 
    repositories { 
     jcenter() 
    } 
    dependencies { 
     classpath 'com.android.tools.build:gradle:2.3.3' 

     // NOTE: Do not place your application dependencies here; they belong 
     // in the individual module build.gradle files 
    } 
} 

allprojects { 
    repositories { 
     jcenter() 
     maven { 
      url "https://maven.google.com" 
     } 
    } 
} 

task clean(type: Delete) { 
    delete rootProject.buildDir 
} 

actitivity_main.xml

<?xml version="1.0" encoding="utf-8"?> 
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    tools:context="example.locationtracker.MainActivity"> 

    <TextView 
     android:id="@+id/latitudeTextView" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_marginTop="67dp" 
     android:text="latitude" 
     app:layout_constraintLeft_toLeftOf="parent" 
     app:layout_constraintRight_toRightOf="parent" 
     app:layout_constraintTop_toTopOf="parent" /> 

    <TextView 
     android:id="@+id/longitudeTextView" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_marginLeft="8dp" 
     android:layout_marginRight="8dp" 
     android:layout_marginTop="8dp" 
     android:text="longitude" 
     app:layout_constraintLeft_toLeftOf="parent" 
     app:layout_constraintRight_toRightOf="parent" 
     app:layout_constraintTop_toBottomOf="@+id/latitudeTextView" /> 

</android.support.constraint.ConstraintLayout> 

매니페스트 :

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="example.locationtracker"> 

    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/> 
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/> 
    <uses-permission android:name="android.permission.INTERNET"/> 

    <application 
     android:allowBackup="true" 
     android:icon="@mipmap/ic_launcher" 
     android:label="@string/app_name" 
     android:roundIcon="@mipmap/ic_launcher_round" 
     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> 

Answer 1

당신이 요청해야합니다 권한

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) { 
     requestPermission(); 
    } 

public void requestPermission(){ 
    ActivityCompat.requestPermissions(activity, 
      new String[]{Manifest.permission.ACCESS_FINE_LOCATION, 
        Manifest.permission.ACCESS_COARSE_LOCATION}, 
      REQUEST_CODE_PERMISSIONS); 
} 

는 당신이 당신 권한이 부여되어 있는지 여부를 확인해야하는 부분을 찾아 볼 수

@Override 
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { 
    super.onRequestPermissionsResult(requestCode, permissions, grantResults); 

    switch (requestCode) { 
     case REQUEST_CODE_PERMISSIONS: { 
      // If request is cancelled, the result arrays are empty. 
      if (grantResults.length > 0 
        && grantResults[0] == PackageManager.PERMISSION_GRANTED) { 

       // permission was granted, yay! Do the 
       // contacts-related task you need to do. 

      } else { 

       // permission denied, boo! Disable the 
       // functionality that depends on this permission. 
      } 
      return; 
     } 

     // other 'case' lines to check for other 
     // permissions this app might request 
    } 
}