我試圖使用Google Play服務創建Android位置API。但是我一直持續將mLastLocation值設置爲null,並在消息中顯示「無法獲取位置。請確保設備上的位置已啓用」,我已給它顯示mLastLocation的空值。誰能告訴我我做錯了什麼?這是我一直在嘗試的代碼。提前致謝。mLastLocation值在使用GPS創建Android位置API時變爲空。
CODE:
package com.example.jamshi.locationapi;
import android.app.Activity;
import android.location.Location;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
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 {
private static final String TAG = MainActivity.class.getSimpleName();
private static final int PLAY_SERVICES_RESOLUTION_REQUEST = 1000;
private Location mLastLocation;
private GoogleApiClient mGoogleApiClient;
private TextView tvLocation;
private Button btnShowLocation,btnLocationUpdates;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvLocation = (TextView) findViewById(R.id.tvLocation);
btnShowLocation = (Button) findViewById(R.id.btnShowLocation);
btnLocationUpdates = (Button) findViewById(R.id.btnLocationUpdates);
if(checkPlayServices()){
buildGoogleApiClient();
}
btnShowLocation.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
displayLocation();
}
});
}
private void displayLocation() {
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if (mLastLocation != null) {
double latitude = mLastLocation.getLatitude();
double longitude = mLastLocation.getLongitude();
tvLocation.setText(latitude + ", " + longitude);
} else {
tvLocation.setText("(Couldn't get the location. Make sure location is enabled 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;
}
protected synchronized void buildGoogleApiClient() {
if (mGoogleApiClient == null) {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API).build();
}
}
@Override
protected void onStart() {
if (mGoogleApiClient != null) {
mGoogleApiClient.connect();
}
super.onStart();
}
@Override
protected void onResume() {
super.onResume();
checkPlayServices();
}
@Override
public void onConnectionFailed(ConnectionResult result) {
Log.i(TAG, "Connection failed: ConnectionResult.getErrorCode() = "
+ result.getErrorCode());
}
@Override
public void onConnected(Bundle arg0) {
displayLocation();
}
@Override
public void onConnectionSuspended(int arg0)
{
mGoogleApiClient.connect();
}
}
您在設備或模擬器測試? b'z模擬器沒有以前的位置數據。 – androidnoobdev
我在模擬器中測試 – user6239257
在onStart中,爲什麼您嘗試連接到GoogleApiClient客戶端,如果它不爲null? 此外,單擊按鈕或開始活動時是否顯示錯誤消息? –