Question

我用地图开发app并将应用程序发布到市场。现在，我有2次崩溃＆amp;来自我的应用程序的两个用户的ANR。但对我来说，我的工作完美！我不知道问题是什么？！ :( 这是我的代码和他们得到的错误：

public class MapCurrentPlace2 implements LocationListener {

public Context context;
double latitude = 0;
double longitude = 0;
String placeName = "";

// then use below code
// 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

Location location = null;
 boolean isGPSEnabled;
 boolean isNetworkEnabled;
 private boolean canGetLocation;


public MapCurrentPlace2(Context context) {
    super();
    this.context = context;
}


public Location getLocation() {

    try {
        LocationManager locationManager = (LocationManager) context.getSystemService(context.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, (android.location.LocationListener) 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, (android.location.LocationListener) 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;
}


@Override
public void onLocationChanged(Location arg0) {

}


public double getLat(){
    location = getLocation();
    latitude = location.getLatitude();
    return latitude;
}


public double getLng(){
    location = getLocation();
    longitude = location.getLatitude();
    return latitude;
}

第一个用户错误：

Android版： Android 4.21 装置：Lg g2

java.lang.NullPointerException
at com.bi.workclock.tools.MapCurrentPlace.getLatitude(MapCurrentPlace.java:42)
at com.bi.workclock.MainActivity.startTimer(MainActivity.java:269)
at com.bi.workclock.MainActivity.onLongClick(MainActivity.java:786)
at android.view.View.performLongClick(View.java:4376)
at android.view.View$CheckForLongPress.run(View.java:17613)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5171)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:797)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:564)
at dalvik.system.NativeStart.main(Native Method)

和秒用户错误： Android版本： Android 4.31 设备： Galaxy S3（m0）

java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
at java.util.ArrayList.get(ArrayList.java:308)
at com.bi.workclock.tools.MapCurrentPlace.getPlaceName(MapCurrentPlace.java:74)
at com.bi.workclock.MainActivity.startTimer(MainActivity.java:271)
at com.bi.workclock.MainActivity.onLongClick(MainActivity.java:786)
at android.view.View.performLongClick(View.java:4511)
at android.view.View$CheckForLongPress.run(View.java:18758)
at android.os.Handler.handleCallback(Handler.java:730)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:176)
at android.app.ActivityThread.main(ActivityThread.java:5419)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
at dalvik.system.NativeStart.main(Native Method)

这是我的代码版本2 ... **这是一个好方法吗？！：**

public class MapCurrentPlace {

    public Context context;
    double latitude = 0;
    double longitude = 0;
    String placeName = "";



    public MapCurrentPlace(Context context) {
        super();
        this.context = context;
    }




    public double getLatitude() throws IOException {
        try {
            LocationManager locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
            Criteria criteria = new Criteria();
            String provider = locationManager.getBestProvider(criteria, true);
            Location location = locationManager.getLastKnownLocation(provider);

            if(location != null){
                latitude = location.getLatitude();
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
        return latitude;
    }

    public double getLongitude() throws IOException {
        try {
            LocationManager locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
            Criteria criteria = new Criteria();
            String provider = locationManager.getBestProvider(criteria, true);
            Location location = locationManager.getLastKnownLocation(provider);
            if(location != null){
                longitude = location.getLongitude();    
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        return longitude;
    }


    public String getPlaceName() throws IOException {
        try {
            LocationManager locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
            Criteria criteria = new Criteria();
            String provider = locationManager.getBestProvider(criteria, true);
            Location location = locationManager.getLastKnownLocation(provider);

            latitude = location.getLatitude();
            longitude = location.getLongitude();

            //Get location info
            Geocoder gc = new Geocoder(context);
            if(location != null && gc !=null){
                List<Address> list = gc.getFromLocation(latitude, longitude, 1);
                if(list.size()>0){
                    String city = list.get(0).getLocality();
                    String street = list.get(0).getAddressLine(0);
                    placeName = city+", "+street+"";        
                }


            }else{
                placeName = "";
            }


        } catch (Exception e) {
            e.printStackTrace();
            placeName = "";
        }



        return placeName;
    }

谢谢大家，我喜欢这个网站！

Answer 1

由于您的Geocoder课程有时会返回null值，这就是您的应用崩溃的原因使用Google Place Api通过您的lat long查找地址并按照链接使用Using Google Places API

Answer 2

getLastKnownLocation()如果用户未打开地图或重新安装应用程序，它将返回用户的最后已知位置，它将不具有任何最后已知位置。所以它会导致Null指针异常。

尝试以下代码： -

class abc implements LocationListener // then use below code
// 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
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;
}

Answer 3

我认为您缺少一些错误检测代码行。添加一个if来检查arraylist.length是否为＆gt;这应该可以解决星系s3的问题。对于g2另一个如果对于纬度而且经度以及检查值是否为空，那么执行您正在执行的代码。

你总是需要这些检查，所以你最终不会因为这种情况发生FC关闭和错误。

我的Google地图api v2应用崩溃了

3 个答案: