无法使getLastLocation方法在Android Studio中工作
我正在用Android中的定位服务进行测试,我严格按照开发人员的指示(此处:)进行测试,但无论如何都不走运。在我的布局中,我只有两个文本视图来显示位置对象的纬度和经度。我应该提到的是,我使用的是启用GPS的Genymotion VM 这是我在MainActivity中的代码:无法使getLastLocation方法在Android Studio中工作,android,service,location,Android,Service,Location,我正在用Android中的定位服务进行测试,我严格按照开发人员的指示(此处:)进行测试,但无论如何都不走运。在我的布局中,我只有两个文本视图来显示位置对象的纬度和经度。我应该提到的是,我使用的是启用GPS的Genymotion VM 这是我在MainActivity中的代码: package criminalintent.android.bignerdranch.com.testgetlocation; import android.app.Activity; import android.l
package criminalintent.android.bignerdranch.com.testgetlocation;
import android.app.Activity;
import android.location.Location;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.drive.Drive;
import com.google.android.gms.location.LocationServices;
public class MainActivity extends Activity implements
GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
GoogleApiClient mGoogleApiClient;
private TextView mLatitudeText;
private TextView mLongitudeText;
@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);
buildGoogleApiClient();
}
protected synchronized void buildGoogleApiClient() {
Toast.makeText(this,"buildGoogleApiClient",Toast.LENGTH_SHORT).show();
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
@Override
public void onConnected(Bundle bundle) {
Toast.makeText(this,"onConnected",Toast.LENGTH_SHORT).show();
Location 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) {
Toast.makeText(this,"onConnectionSuspended",Toast.LENGTH_SHORT).show();
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
Toast.makeText(this,"onConnectionFailed",Toast.LENGTH_SHORT).show();
}
}
我已在清单文件中添加获取位置服务的权限:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="criminalintent.android.bignerdranch.com.testgetlocation" >
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
你错过了接通的电话 在调用
buildGoogleAppClient()
之后,在onCreate()
中添加对connect()
的调用:
请注意,即使使用此修复程序,对getLastLocation()
的调用也很容易为您提供空位置
我建议注册一个监听器,如果你得到一个空位置,看看如何做到这一点的信息
编辑:因为我已经运行了您的代码,所以我继续添加了一个位置侦听器。请注意,在这段代码中,我在第一次onLocationChanged()
回调发生时添加了对removelocationUpdate()
的调用,例如:
import android.os.Bundle;
import android.app.Activity;
import android.location.Location;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.location.LocationListener;
public class MainActivity extends Activity implements
GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener {
LocationRequest mLocationRequest;
GoogleApiClient mGoogleApiClient;
private TextView mLatitudeText;
private TextView mLongitudeText;
@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);
buildGoogleApiClient();
mGoogleApiClient.connect(); //add this here
}
protected synchronized void buildGoogleApiClient() {
Toast.makeText(this,"buildGoogleApiClient",Toast.LENGTH_SHORT).show();
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
@Override
public void onConnected(Bundle bundle) {
Toast.makeText(this,"onConnected",Toast.LENGTH_SHORT).show();
Location mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
mGoogleApiClient);
if (mLastLocation != null) {
mLatitudeText.setText(String.valueOf(mLastLocation.getLatitude()));
mLongitudeText.setText(String.valueOf(mLastLocation.getLongitude()));
}
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(10000); //10 seconds
mLocationRequest.setFastestInterval(5000); //5 seconds
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
mLocationRequest.setSmallestDisplacement(1); //1 meter
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
@Override
public void onConnectionSuspended(int i) {
Toast.makeText(this,"onConnectionSuspended",Toast.LENGTH_SHORT).show();
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
Toast.makeText(this,"onConnectionFailed",Toast.LENGTH_SHORT).show();
}
@Override
public void onLocationChanged(Location location) {
Toast.makeText(this,"Location Changed",Toast.LENGTH_SHORT).show();
mLatitudeText.setText(String.valueOf(location.getLatitude()));
mLongitudeText.setText(String.valueOf(location.getLongitude()));
//If you only need one location, unregister the listener
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
}
}
还请注意,您应该将其添加到应用程序标记内的AndroidManifest.xml中:
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
Android Studio或Eclipse?能否添加build.gradle文件?是的,请稍后添加。:)那有什么问题?文档说它可能是空的..我正在使用启用GPS的GenyMoon。它不应该是空的+我已经在物理设备上测试过了,再次…谢谢。这对我的OPO有效,但对启用GPS的Genymotion VM无效,不知道为什么。再次感谢!:)@GeorgiKoemdzhiev当然,没问题!还有一件事需要注意,您应该将其添加到应用程序标记内的AndroidManifest.xml中:
让我猜猜。这会让我的谷歌服务保持更新吗?:)
import android.os.Bundle;
import android.app.Activity;
import android.location.Location;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.location.LocationListener;
public class MainActivity extends Activity implements
GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener {
LocationRequest mLocationRequest;
GoogleApiClient mGoogleApiClient;
private TextView mLatitudeText;
private TextView mLongitudeText;
@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);
buildGoogleApiClient();
mGoogleApiClient.connect(); //add this here
}
protected synchronized void buildGoogleApiClient() {
Toast.makeText(this,"buildGoogleApiClient",Toast.LENGTH_SHORT).show();
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
@Override
public void onConnected(Bundle bundle) {
Toast.makeText(this,"onConnected",Toast.LENGTH_SHORT).show();
Location mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
mGoogleApiClient);
if (mLastLocation != null) {
mLatitudeText.setText(String.valueOf(mLastLocation.getLatitude()));
mLongitudeText.setText(String.valueOf(mLastLocation.getLongitude()));
}
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(10000); //10 seconds
mLocationRequest.setFastestInterval(5000); //5 seconds
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
mLocationRequest.setSmallestDisplacement(1); //1 meter
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
@Override
public void onConnectionSuspended(int i) {
Toast.makeText(this,"onConnectionSuspended",Toast.LENGTH_SHORT).show();
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
Toast.makeText(this,"onConnectionFailed",Toast.LENGTH_SHORT).show();
}
@Override
public void onLocationChanged(Location location) {
Toast.makeText(this,"Location Changed",Toast.LENGTH_SHORT).show();
mLatitudeText.setText(String.valueOf(location.getLatitude()));
mLongitudeText.setText(String.valueOf(location.getLongitude()));
//If you only need one location, unregister the listener
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
}
}
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />