我正在制作 android 应用程序，其中我需要使用位置管理器 api 的用户当前位置...首先它确保互联网连接，如果没有连接互联网，则会在应用程序上显示 dailog 框。然后它将获得纬度和纬度。但是当我运行它，它显示了不同类型的错误，如致命的主要异常等。我很累，但严重的是我找不到出路，因为它与最后一年的项目有关，所以请帮助我..
package com.example.directory;
import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.widget.ListView;
public class MainActivity extends Activity {
ConnectionDetector cd;
AlertDialogManager alert = new AlertDialogManager();
Boolean isInternetPresent = false;
GPSTracker gps;
ListView lv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//cd = new ConnectionDetector(getApplicationContext());
//isInternetPresent = cd.isConnectingToInternet();
/*if (!isInternetPresent) {
// Internet Connection is not present
alert.showAlertDialog(MainActivity.this, "Internet Connection Error",
"Please connect to working Internet connection", false);
// stop executing code by return
return;
}
else{alert.showAlertDialog(MainActivity.this, "Internet Connection Error",
" working Internet connection", false);}*/
gps = new GPSTracker(this);
if (gps.canGetLocation()) {
Log.d("Your Location", "latitude:" + gps.getLatitude() + ", longitude: " + gps.getLongitude());
} else {
// Can't get user's current location
alert.showAlertDialog(MainActivity.this, "GPS Status",
"Couldn't get location information. Please enable GPS",
false);
// stop executing code by return
return;
}
// lv = (ListView) findViewById(R.id.list);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
/////////////////////
package com.example.directory;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
public class ConnectionDetector {
private Context _context;
public ConnectionDetector(Context context){
this._context = context;
}
/**
* Checking for all possible internet providers
* **/
public boolean isConnectingToInternet(){
ConnectivityManager connectivity = (ConnectivityManager) _context.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity != null)
{
NetworkInfo[] info = connectivity.getAllNetworkInfo();
if (info != null)
for (int i = 0; i < info.length; i++)
if (info[i].getState() == NetworkInfo.State.CONNECTED)
{
return true;
}
}
return false;
}
}
//////////////////
package com.example.directory;
import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.provider.Settings;
import android.util.Log;
public class GPSTracker extends Service implements LocationListener {
private final Context mContext;
// flag for GPS status
boolean isGPSEnabled = false;
// flag for network status
boolean isNetworkEnabled = false;
// flag for GPS status
boolean canGetLocation = false;
Location location = null; // location
double latitude; // latitude
double longitude; // longitude
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute
// Declaring a Location Manager
protected LocationManager locationManager;
public GPSTracker(Context context) {
this.mContext = context;
getLocation();
}
public Location getLocation() {
try {
locationManager = (LocationManager) mContext
.getSystemService(LOCATION_SERVICE);
// getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
} else {
this.canGetLocation = true;
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return location;
}
/**
* Stop using GPS listener Calling this function will stop using GPS in your
* app
* */
public void stopUsingGPS() {
if (locationManager != null) {
locationManager.removeUpdates(GPSTracker.this);
}
}
/**
* Function to get latitude
* */
public double getLatitude() {
if (location != null) {
latitude = location.getLatitude();
}
// return latitude
return latitude;
}
/**
* Function to get longitude
* */
public double getLongitude() {
if (location != null) {
longitude = location.getLongitude();
}
// return longitude
return longitude;
}
/**
* Function to check GPS/wifi enabled
*
* @return boolean
* */
public boolean canGetLocation() {
return this.canGetLocation;
}
@Override
public void onLocationChanged(Location location) {
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public IBinder onBind(Intent arg0) {
return null;
}}
/////////////////////////
package com.example.directory;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
public class AlertDialogManager {
/**
* Function to display simple Alert Dialog
* @param context - application context
* @param title - alert dialog title
* @param message - alert message
* @param status - success/failure (used to set icon)
* - pass null if you don't want icon
* */
public void showAlertDialog(Context context, String title, String message,
Boolean status) {
AlertDialog alertDialog = new AlertDialog.Builder(context).create();
// Setting Dialog Title
alertDialog.setTitle(title);
// Setting Dialog Message
alertDialog.setMessage(message);
if(status != null)
// Setting alert dialog icon
alertDialog.setIcon((status) ? R.drawable.success : R.drawable.fail);
// Setting OK Button
alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
}
});
// Showing Alert Message
alertDialog.show();
}
}
log cat
////////////////////////////
01-26 20:11:59.212: W/dalvikvm(2541): threadid=1: thread exiting with uncaught exception (group=0x40015560)
01-26 20:11:59.232: E/AndroidRuntime(2541): FATAL EXCEPTION: main
01-26 20:11:59.232: E/AndroidRuntime(2541): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.directory/com.example.directory.MainActivity}: java.lang.SecurityException: ConnectivityService: Neither user 10042 nor current process has android.permission.ACCESS_NETWORK_STATE.
01-26 20:11:59.232: E/AndroidRuntime(2541): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
01-26 20:11:59.232: E/AndroidRuntime(2541): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
01-26 20:11:59.232: E/AndroidRuntime(2541): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
01-26 20:11:59.232: E/AndroidRuntime(2541): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
01-26 20:11:59.232: E/AndroidRuntime(2541): at android.os.Handler.dispatchMessage(Handler.java:99)
01-26 20:11:59.232: E/AndroidRuntime(2541): at android.os.Looper.loop(Looper.java:130)
01-26 20:11:59.232: E/AndroidRuntime(2541): at android.app.ActivityThread.main(ActivityThread.java:3683)
01-26 20:11:59.232: E/AndroidRuntime(2541): at java.lang.reflect.Method.invokeNative(Native Method)
01-26 20:11:59.232: E/AndroidRuntime(2541): at java.lang.reflect.Method.invoke(Method.java:507)
01-26 20:11:59.232: E/AndroidRuntime(2541): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
01-26 20:11:59.232: E/AndroidRuntime(2541): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
01-26 20:11:59.232: E/AndroidRuntime(2541): at dalvik.system.NativeStart.main(Native Method)
01-26 20:11:59.232: E/AndroidRuntime(2541): Caused by: java.lang.SecurityException: ConnectivityService: Neither user 10042 nor current process has android.permission.ACCESS_NETWORK_STATE.
01-26 20:11:59.232: E/AndroidRuntime(2541): at android.os.Parcel.readException(Parcel.java:1322)
01-26 20:11:59.232: E/AndroidRuntime(2541): at android.os.Parcel.readException(Parcel.java:1276)
01-26 20:11:59.232: E/AndroidRuntime(2541): at android.net.IConnectivityManager$Stub$Proxy.getAllNetworkInfo(IConnectivityManager.java:390)
01-26 20:11:59.232: E/AndroidRuntime(2541): at android.net.ConnectivityManager.getAllNetworkInfo(ConnectivityManager.java:267)
01-26 20:11:59.232: E/AndroidRuntime(2541): at com.example.directory.ConnectionDetector.isConnectingToInternet(ConnectionDetector.java:22)
01-26 20:11:59.232: E/AndroidRuntime(2541): at com.example.directory.MainActivity.onCreate(MainActivity.java:23)
01-26 20:11:59.232: E/AndroidRuntime(2541): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
01-26 20:11:59.232: E/AndroidRuntime(2541): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
01-26 20:11:59.232: E/AndroidRuntime(2541): ... 11 more