My problem is getTag() is invoke on a null method. Say in the logcat below.( My app already have setTag() then getTag().
I have an adapter code like this for ListView :
public BeaconListAdapter(Activity context){
this.inflater = LayoutInflater.from(context);
this.beacons = new ArrayList<>();
}
public void replaceWith(Collection<com.estimote.coresdk.recognition.packets.Beacon> newBeacons){
this.beacons.clear();
this.beacons.addAll(newBeacons);
notifyDataSetChanged();
}
@Override
public int getCount() {
return beacons.size();
}
@Override
public com.estimote.coresdk.recognition.packets.Beacon getItem(int position) {
return beacons.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
convertView = inflateRequires(convertView);
bind(getItem(position),convertView);
return convertView;
}
private void bind(final com.estimote.coresdk.recognition.packets.Beacon beacon, View view){
final ViewHolder viewHolder = (ViewHolder) view.getTag();
viewHolder.Address.setText(String.format("Adress:%s", beacon.getMacAddress().toStandardString()));
viewHolder.Distance.setText(String.format("Distance is : %f",com.estimote.coresdk.observation.region.RegionUtils.computeAccuracy(beacon)));
}
private View inflateRequires(View view){
if (view == null){
view = inflater.inflate(R.layout.view_beacon_info,null,false);
view.setTag(new ViewHolder(view));
}
return null;
}
static class ViewHolder{
public TextView Distance;
public TextView Address;
ViewHolder(View view){
Distance = (TextView) view.findViewById(R.id.Txt1);
Address = (TextView) view.findViewById(R.id.Txt2);
}
}
}
And my app keep crashing down from the beginging. The log is like this:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.user.beaconranging, PID: 5820
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object android.view.View.getTag()' on a null object reference
at com.example.user.beaconranging.Adapter.BeaconListAdapter.bind(BeaconListAdapter.java:59)
at com.example.user.beaconranging.Adapter.BeaconListAdapter.getView(BeaconListAdapter.java:54)
at android.widget.AbsListView.obtainView(AbsListView.java:2428)
at android.widget.ListView.makeAndAddView(ListView.java:2083)
at android.widget.ListView.fillDown(ListView.java:793)
at android.widget.ListView.fillFromTop(ListView.java:859)
at android.widget.ListView.layoutChildren(ListView.java:1816)
at android.widget.AbsListView.onLayout(AbsListView.java:2226)
at android.view.View.layout(View.java:19781)
at android.view.ViewGroup.layout(ViewGroup.java:6144)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:325)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:19781)
at android.view.ViewGroup.layout(ViewGroup.java:6144)
at android.support.v7.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:443)
at android.view.View.layout(View.java:19781)
at android.view.ViewGroup.layout(ViewGroup.java:6144)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:325)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:19781)
at android.view.ViewGroup.layout(ViewGroup.java:6144)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1816)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1660)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1569)
at android.view.View.layout(View.java:19781)
at android.view.ViewGroup.layout(ViewGroup.java:6144)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:325)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at com.android.internal.policy.DecorView.onLayout(DecorView.java:888)
at android.view.View.layout(View.java:19781)
at android.view.ViewGroup.layout(ViewGroup.java:6144)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2653)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2356)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1512)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7218)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:981)
at android.view.Choreographer.doCallbacks(Choreographer.java:790)
at android.view.Choreographer.doFrame(Choreographer.java:721)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:967)
at android.os.Handler.handleCallback(Handler.java:808)
at android.os.Handler.dispatchMessage(Handler.java:101)
at android.os.Looper.loop(Looper.java:166)
at android.app.ActivityThread.main(ActivityThread.java:7425)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:245)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:921)
I see the logcat and it's fault is in the code i up above, on line 59 and line 54.
