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android - 无法让 getLastLocation 方法在 Android Studio 中工作

转载 作者:行者123 更新时间:2023-11-29 00:10:50 25 4
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我正在使用 Android 中的位置服务进行测试,并且我严格遵循开发人员说明(此处:Google dev. link)如何执行此操作,但一直没有运气。在我的布局中,我只有两个 TextViews 来显示 Location 对象的纬度和经度。我应该提一下,我正在使用启用了 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.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();
}
}

我在Manifest文件中添加了获取定位服务的权限:

<?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>

这是我的模块build.gradle文件代码:

apply plugin: 'com.android.application'

android {
compileSdkVersion 22
buildToolsVersion "21.1.2"

defaultConfig {
applicationId "criminalintent.android.bignerdranch.com.testgetlocation"
minSdkVersion 14
targetSdkVersion 22
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:22.1.1'
compile 'com.google.android.gms:play-services:7.3.0'
}

最佳答案

您错过了连接电话。

在调用 buildGoogleApiClient() 之后,在 onCreate() 中添加对 connect() 的调用:

@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

}

请注意,即使有了此修复,对 getLastLocation() 的调用也很可能会为您提供空位置。

如果你得到一个空位置,我建议注册一个监听器,看看this answer有关如何执行此操作的信息。

编辑:因为我已经运行了你的代码,所以我继续添加了一个位置监听器。请注意,在这段代码中,我在第一个 onLocationChanged() 回调发生时添加了对 removeLocationUpdates() 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);

}

}

另请注意,您应该将其添加到应用程序标签内的 AndroidManifest.xml 中:

    <meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />

关于android - 无法让 getLastLocation 方法在 Android Studio 中工作,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30248851/

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