java.lang.NullPointerException：嘗試從空字段'double com.google.android.gms.maps.model.LatLng.a'讀取null對象引用

我的android應用程序正在發生這些崩潰，但我無法確定出來。代碼看起來很好。奇怪的是，這似乎只發生在三星手機上。我無法在任何手機上覆制，但三星手機。java.lang.NullPointerException：嘗試從空字段'double com.google.android.gms.maps.model.LatLng.a'讀取null對象引用

java.lang.NullPointerException: Attempt to read from field 'double 
com.google.android.gms.maps.model.LatLng.a' on a null object reference 

at com.myapp.mapapp.helper.SavedItemsAdapter.access$000(SavedItemsAdapter.java:16) 
at com.myapp.mapapp.helper.SavedItemsAdapter$ViewHolder.build(SavedItemsAdapter.java:47) 
at com.myapp.mapapp.helper.SavedItemsAdapter.getView(SavedItemsAdapter.java:33) 
at android.widget.AbsListView.obtainView(AbsListView.java:2929) 
at android.widget.ListView.measureHeightOfChildren(ListView.java:1305) 
at android.widget.ListView.onMeasure(ListView.java:1212) 
at android.view.View.measure(View.java:20151) 
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6328) 
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 
at android.view.View.measure(View.java:20151) 
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6328) 
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 
at android.view.View.measure(View.java:20151) 
at android.support.v7.widget.AlertDialogLayout.tryOnMeasure(AlertDialogLayout.java:135) 
at android.support.v7.widget.AlertDialogLayout.onMeasure(AlertDialogLayout.java:63) 
at android.view.View.measure(View.java:20151) 
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6328) 
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 
at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:139) 
at android.view.View.measure(View.java:20151) 
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6328) 
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 
at android.view.View.measure(View.java:20151) 
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6328) 
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 
at android.view.View.measure(View.java:20151) 
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6328) 
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464) 
at android.widget.LinearLayout.measureVertical(LinearLayout.java:747) 
at android.widget.LinearLayout.onMeasure(LinearLayout.java:629) 
at android.view.View.measure(View.java:20151) 
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6328) 
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 
at com.android.internal.policy.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:3158) 
at android.view.View.measure(View.java:20151) 
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2594) 
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1524) 
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1841) 
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1437) 
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7397) 
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:920) 
at android.view.Choreographer.doCallbacks(Choreographer.java:695) 
at android.view.Choreographer.doFrame(Choreographer.java:631) 
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:906) 
at android.os.Handler.handleCallback(Handler.java:739) 
at android.os.Handler.dispatchMessage(Handler.java:95) 
at android.os.Looper.loop(Looper.java:158) 
at android.app.ActivityThread.main(ActivityThread.java:7224) 
at java.lang.reflect.Method.invoke(Method.java) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

這是從它引起它的文件代碼。我查過了，但一切看起來不錯。

package com.myapp.mapapp.helper; 

import android.content.Context; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ArrayAdapter; 
import android.widget.TextView; 

import com.google.android.gms.maps.model.LatLng; 
import com.myapp.mapapp.R; 

/** 
* Created by Alexey Rogovoy ([email protected]) on 23.06.2015. 
*/ 
public class SavedItemsAdapter extends ArrayAdapter<SaveLocationHelper.SavedLocation>{ 
private LayoutInflater mInflater; 
public SavedItemsAdapter(Context context,SaveLocationHelper helper){ 
    super(context,0,helper.getItems()); 
    mInflater = LayoutInflater.from(context); 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
    ViewHolder holder; 
    if (convertView==null){ 
     convertView = mInflater.inflate(R.layout.saved_location_list_item,parent,false); 
     holder = new ViewHolder(convertView); 
    } 
    else{ 
     holder = (ViewHolder)convertView.getTag(); 
    } 
    holder.build(position); 
    return convertView; 
} 
private class ViewHolder{ 
    private TextView title; 
    private TextView location; 
    public ViewHolder(View rootView){ 
     title = (TextView)rootView.findViewById(R.id.title); 
     location = (TextView)rootView.findViewById(R.id.location); 
     rootView.setTag(this); 
    } 
    public void build(int position){ 
     SaveLocationHelper.SavedLocation item = getItem(position); 
     title.setText(item.name); 
     location.setText(getLocationAsText(item.location)); 
    } 
} 

private String getLocationAsText(LatLng location) { 
    return "@"+String.format("%.5f-%.5f",location.latitude,location.longitude); 
} 
}

來源

2017-02-14 JohnRogersColumbiaEDU