这是我创建的代码，是一个简单的活动，在按钮点击时显示用户艺术定期间隔的当前位置。我想使它成为一项服务，以便当我点击按钮时，它启动服务，继续获取用户的当前位置，但我无法做到这一点。有人可以帮助我做到这一点。这是MainActivity.java的代码。
package com.maps.saury.location;
import android.app.Activity;
import android.app.Service;
import android.content.Intent;
import android.location.Location;
import android.os.Bundle;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
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.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
public class MainActivity extends Activity implements ConnectionCallbacks,
OnConnectionFailedListener, LocationListener {
BGTask bgtask=new BGTask(this);
// LogCat tag
private static final String TAG = MainActivity.class.getSimpleName();
private final static int PLAY_SERVICES_RESOLUTION_REQUEST = 1000;
private Location mLastLocation;
// Google client to interact with Google API
private GoogleApiClient mGoogleApiClient;
// boolean flag to toggle periodic location updates
private boolean mRequestingLocationUpdates = false;
private LocationRequest mLocationRequest;
// Location updates intervals in sec
private static int UPDATE_INTERVAL = 100; // 10 sec
private static int FATEST_INTERVAL = 100; // 5 sec
private static int DISPLACEMENT = 0; // 10 meters
// UI elements
private TextView lblLocation;
private Button btnShowLocation, btnStartLocationUpdates;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lblLocation = (TextView) findViewById(R.id.lblLocation);
btnShowLocation = (Button) findViewById(R.id.btnShowLocation);
btnStartLocationUpdates = (Button) findViewById(R.id.btnLocationUpdates);
// First we need to check availability of play services
if (checkPlayServices()) {
// Building the GoogleApi client
buildGoogleApiClient();
createLocationRequest();
}
// Show location button click listener
btnShowLocation.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
displayLocation();
}
});
// Toggling the periodic location updates
btnStartLocationUpdates.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
togglePeriodicLocationUpdates();
}
});
}
@Override
protected void onStart() {
super.onStart();
if (mGoogleApiClient != null) {
mGoogleApiClient.connect();
}
}
@Override
protected void onResume() {
super.onResume();
checkPlayServices();
// Resuming the periodic location updates
if (mGoogleApiClient.isConnected() && mRequestingLocationUpdates) {
startLocationUpdates();
}
}
@Override
protected void onStop() {
super.onStop();
if (mGoogleApiClient.isConnected()) {
mGoogleApiClient.disconnect();
}
}
@Override
protected void onPause() {
super.onPause();
stopLocationUpdates();
}
/**
* Method to display the location on UI
* */
private void displayLocation() {
mLastLocation = LocationServices.FusedLocationApi
.getLastLocation(mGoogleApiClient);
if (mLastLocation != null) {
double latitude = mLastLocation.getLatitude();
double longitude = mLastLocation.getLongitude();
lblLocation.setText(latitude + ", " + longitude);
BGTask bgtask=new BGTask(this);
bgtask.execute(Double.toString(latitude),Double.toString(longitude));
} else {
lblLocation
.setText("(Couldn't get the location. Make sure location is enabled on the device)");
}
}
/**
* Method to toggle periodic location updates
* */
private void togglePeriodicLocationUpdates() {
if (!mRequestingLocationUpdates) {
// Changing the button text
btnStartLocationUpdates
.setText(getString(R.string.btn_stop_location_updates));
mRequestingLocationUpdates = true;
// Starting the location updates
startLocationUpdates();
Log.d(TAG, "Periodic location updates started!");
} else {
// Changing the button text
btnStartLocationUpdates
.setText(getString(R.string.btn_start_location_updates));
mRequestingLocationUpdates = false;
// Stopping the location updates
stopLocationUpdates();
Log.d(TAG, "Periodic location updates stopped!");
}
}
/**
* Creating google api client object
* */
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API).build();
}
/**
* Creating location request object
* */
protected void createLocationRequest() {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(UPDATE_INTERVAL);
mLocationRequest.setFastestInterval(FATEST_INTERVAL);
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
mLocationRequest.setSmallestDisplacement(DISPLACEMENT);
}
/**
* Method to verify google play services on the device
* */
private boolean checkPlayServices() {
int resultCode = GooglePlayServicesUtil
.isGooglePlayServicesAvailable(this);
if (resultCode != ConnectionResult.SUCCESS) {
if (GooglePlayServicesUtil.isUserRecoverableError(resultCode)) {
GooglePlayServicesUtil.getErrorDialog(resultCode, this,
PLAY_SERVICES_RESOLUTION_REQUEST).show();
} else {
Toast.makeText(getApplicationContext(),
"This device is not supported.", Toast.LENGTH_LONG)
.show();
finish();
}
return false;
}
return true;
}
/**
* Starting the location updates
* */
protected void startLocationUpdates() {
LocationServices.FusedLocationApi.requestLocationUpdates( mGoogleApiClient, mLocationRequest, this);
}
/**
* Stopping location updates
*/
protected void stopLocationUpdates() {
LocationServices.FusedLocationApi.removeLocationUpdates(
mGoogleApiClient, this);
}
/**
* Google api callback methods
*/
@Override
public void onConnectionFailed(ConnectionResult result) {
Log.i(TAG, "Connection failed: ConnectionResult.getErrorCode() = "
+ result.getErrorCode());
}
@Override
public void onConnected(Bundle arg0) {
// Once connected with google api, get the location
displayLocation();
if (mRequestingLocationUpdates) {
startLocationUpdates();
}
}
@Override
public void onConnectionSuspended(int arg0) {
mGoogleApiClient.connect();
}
@Override
public void onLocationChanged(Location location) {
// Assign the new location
mLastLocation = location;
Toast.makeText(getApplicationContext(), "Locatn changed!",
Toast.LENGTH_SHORT).show();
// Displaying the new location on UI
displayLocation();
}
}
这是我的Activity_Main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:background="@color/view_bg"
android:gravity="center_horizontal"
android:orientation="vertical" >
<ImageView
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_marginTop="60dp"
android:src="@drawable/marker" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="25dp"
android:text="@string/lbl_you_are_at"
android:textColor="@color/white"
android:textSize="25dp"
android:textStyle="bold" />
<TextView
android:id="@+id/lblLocation"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:padding="15dp"
android:textColor="@color/white"
android:textSize="16dp" />
<Button
android:id="@+id/btnShowLocation"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="40dp"
android:background="@color/btn_bg"
android:paddingLeft="20dp"
android:paddingRight="20dp"
android:text="@string/btn_get_location"
android:textColor="@color/white" />
<Button
android:id="@+id/btnLocationUpdates"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="60dp"
android:background="@color/btn_bg"
android:paddingLeft="20dp"
android:paddingRight="20dp"
android:text="@string/btn_start_location_updates"
android:textColor="@color/white" />
</LinearLayout>
答案 0 :(得分：0)
First Check your Manifest.xml and check Internet permission.
<permission
android:name="com.hamms.cabsystem.permission.MAPS_RECEIVE"
android:protectionLevel="signature" />
Second Check google Map Api Meta data.
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="AIzaSyBBGHOC13C00ew4xKD7kyei0M3bul8093s" />
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
Then, Create on ServiceClass like this and start Service on click of button.
btn_save.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
startService(new Intent(this,MyService.class));
}
}
public class MyService extend Service{
onstartCommand(){
Intent i = new Intent(youraction);
sendBroadCast(i);
}
In Myservice onStartCommand Method Send OneBraodcast which is update your location.
Register Brodcast Receiver in Manifest,xml
<receiver android:name="MyBroadCast"></receiver>
public class MyBroadCast extend BrodcastReciver{
// here onRecive Method you upadate your location.
// do something here //
}