当我获得 geocoord 时，Android 崩溃

Question

大家好， 我尝试在这里读取尽可能多的 GPS 数据。 响应。我想确定位置。 我现在有几乎所有的建议，但这里没有任何内容。 getLastKnownLocation() 总是返回 null。 应用程序崩溃。 有人可以帮我吗？ 这是我的代码。

我的清单

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="de.xxx.xxxbrokenstream"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.WRITE_SETTINGS"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
<uses-permission android:name="android.permission.WAKE_LOCK" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="de.xxx.xxxbrokenstream.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>

</manifest>

MainActivity

package de.xxx.xxxbrokenstream;

import de.xxx.xxxbrokenstream.R;

import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.app.Activity;
import android.content.ContextWrapper;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public abstract class MainActivity extends Activity implements LocationListener {

ContextWrapper context;
double longitude;
double latitude;

private LocationManager locationManager;
private boolean isGps, isNetwork;
private double currentLat, currentLong;
private Location location;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    setDefaultButton();

    locationManager = (LocationManager) this
            .getSystemService(LOCATION_SERVICE);

    isGps = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);

    isNetwork = locationManager
            .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
            1000, 0, this);

    locationManager.requestLocationUpdates(
            LocationManager.NETWORK_PROVIDER, 1000, 0,
            this);

    getCurrentLocation();



};

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
};

public void setDefaultButton() {
    Button buttonstream1 = (Button) findViewById(R.id.btn_stream1);
    buttonstream1 .setVisibility(View.VISIBLE);
    buttonstream1 .setOnClickListener(stream1Listener);

    Button buttonstream2 = (Button) findViewById(R.id.btn_stream2);
    buttonstream2 .setVisibility(View.VISIBLE);
    buttonstream2 .setOnClickListener(stream2Listener);

    Button buttonstream3 = (Button) findViewById(R.id.btn_stream3);
    buttonstream3 .setVisibility(View.VISIBLE);
    buttonstream3 .setOnClickListener(stream3Listener);

 };

// Listener

 LocationListener locationListener = new LocationListener() {

    public void onStatusChanged(String provider, int status, Bundle extras) {
    }

     public void onProviderEnabled(String provider) {
     }

     public void onProviderDisabled(String provider) {
     }

     public void onLocationChanged(Location location) {
         try {
             if (location != null) {
                currentLat = location.getLatitude();
                currentLong = location.getLongitude();
             }
        } catch (Exception e) {
            e.printStackTrace();
         }
     }

};

private OnClickListener stream1Listener = new OnClickListener() {
    public void onClick(View v) {
        // do something when the button is clicked

    }

};

private OnClickListener stream2Listener = new OnClickListener() {
    public void onClick(View v) {

    }
};

private OnClickListener stream3Listener = new OnClickListener() {
    public void onClick(View v) {

    }
};

private void destroyAll() {
    if (locationManager != null)
        locationManager.removeUpdates(this);
}

@Override
public void onDestroy() {
   super.onDestroy();
   destroyAll();
}

/**
 * Get the current location..
 */
public void getCurrentLocation() {
    if (isNetwork) {
        location = locationManager
                   .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);

    } else if (isGps) {
        location = locationManager
                .getLastKnownLocation(LocationManager.GPS_PROVIDER);

    }
    if (location != null) {
        currentLong = location.getLongitude();
        currentLat = location.getLatitude();

    } else {
        currentLong = 0.0;
        currentLat = 0.0;
    }
}

public double getCurrentLat() {
    return currentLat;
}

public void setCurrentLat(double currentLat) {
    this.currentLat = currentLat;
}

public double getCurrentLong() {
    return currentLong;
}

public void setCurrentLong(double currentLong) {
    this.currentLong = currentLong;
}

 }

编辑：

嗨，谢谢。我已经更改了我的代码。 不幸的是，我得到了相同的结果。 应用程序崩溃了。这是来自 eclipse 日志的日志：

致命异常：主要 java.lang.RuntimeException：无法实例化活动 ComponentInfo{de.xxx.xxxbrokenstream/de.xxx.xxxbrokenstream.MainActivity}：java.lang.InstantiationException：无法实例化类 de.xxx.xxxbrokenstream.MainActivity 在 android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2106) 在 android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 在 android.app.ActivityThread.access$600(ActivityThread.java:141) 在 android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 在 android.os.Handler.dispatchMessage(Handler.java:99) 在 android.os.Looper.loop(Looper.java:137) 在 android.app.ActivityThread.main(ActivityThread.java:5041) 在 java.lang.reflect.Method.invokeNative(Native Method) 在 java.lang.reflect.Method.invoke(Method.java:511) 在 com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 在 com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 在 dalvik.system.NativeStart.main（本机方法） 引起：java.lang.InstantiationException：无法实例化类de.xxx.xxxbrokenstream.MainActivity 在 java.lang.Class.newInstanceImpl（本机方法） 在 java.lang.Class.newInstance(Class.java:1319) 在 android.app.Instrumentation.newActivity(Instrumentation.java:1054) 在 android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)

Answer 1

试试这个方法：你的实用程序类

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;
boolean canGetLocation = false;
Location location; // location
double latitude; // latitude
double longitude; // longitude
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 40; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 10000 * 60 * 1; // 10 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;
            // First get location from Network Provider
            if (isNetworkEnabled) {
                locationManager.requestLocationUpdates(
                        LocationManager.NETWORK_PROVIDER,
                        MIN_TIME_BW_UPDATES,
                        MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                Log.d("Network", "Network");
                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 Enabled", "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;
}
@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;
}
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;
}
public boolean canGetLocation() {
    return this.canGetLocation;
}

/**
 * Function to show settings alert dialog
 * */
public void showSettingsAlert(){
    AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

    // Setting Dialog Title
    alertDialog.setTitle("GPS is settings");

    // Setting Dialog Message
    alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");

    // Setting Icon to Dialog
    alertDialog.setIcon(R.drawable.ic_launcher_web);

    // On pressing Settings button
    alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog,int which) {
            Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
            mContext.startActivity(intent);
        }
    });

    // on pressing cancel button
    alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
        dialog.cancel();
        }
    });

    // Showing Alert Message
    alertDialog.show();
}
public void stopUsingGPS(){
    if(locationManager != null){
        locationManager.removeUpdates(GPSTracker.this);
    }      
}
}

从您的活动中调用

public void getLocation() {
    GPSTracker gps = new GPSTracker(this);
    if(gps.canGetLocation()){ 
        double lat = gps.getLatitude(); // returns latitude
        double lng = gps.getLongitude(); // returns longitude
        Global_reco.latitudeTmp = String.valueOf(lat);
        Global_reco.longitudeTmp = String.valueOf(lng);
    }
    if(!gps.canGetLocation())
    {
        gps.showSettingsAlert();
    }
}

它适用于所有设备...希望对您有所帮助

此代码来自http://www.androidhive.info/2012/07/android-gps-location-manager-tutorial