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Bryan Wiedeman
10,203 PointsYet another null pointer exception - DayAdapter ConvertView is null
Like a lot of ppl i'm getting a null pointer exception when I click DAILY. It errors on line 49 of Day adapter which is
convertView = LayoutInflater.from(mContext).inflate(R.layout.daily_list_item, null);
which is the same as in the package files. i ran the debugger and all i found out was what I already knew, that the convertView was coming up null. here's my DayAdapter, let me know if theres any other info that could be valuable.
package com.example.paxie.stormy.Adapters;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import com.example.paxie.stormy.R;
import com.example.paxie.stormy.weather.Day;
/**
* Created by paxie on 9/17/15.
*/
public class DayAdapter extends BaseAdapter {
private Context mContext;
private Day[] mDays;
public DayAdapter(Context context, Day[] days) {
mDays = days;
}
@Override
public int getCount() {
return mDays.length;
}
@Override
public Object getItem(int position) {
return mDays[position];
}
@Override
public long getItemId(int position) {
return 0; //we aren't going to use this. tag items for easy reference
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
//brand new
convertView = LayoutInflater.from(mContext).inflate(R.layout.daily_list_item, null);
holder = new ViewHolder();
holder.iconImageView = (ImageView) convertView.findViewById(R.id.iconImageView);
holder.temperatureLabel = (TextView) convertView.findViewById(R.id.temperatureLabel);
holder.dayLabel = (TextView) convertView.findViewById(R.id.dayNameLabel);
convertView.setTag(holder);
}
else {
holder = (ViewHolder) convertView.getTag();
}
Day day = mDays[position];
holder.iconImageView.setImageResource(day.getIconId());
holder.temperatureLabel.setText(day.getTemperatureMax() + "");
holder.dayLabel.setText(day.getDayOfTheWeek());
return null;
}
private static class ViewHolder {
ImageView iconImageView; //public by default
TextView temperatureLabel;
TextView dayLabel;
}
}
4 Answers
Seth Kroger
56,413 PointsYou're forgetting to set mContext in the constructor, which will cause LayoutInflater.from(mContext) to throw a NullPointerExecption.
Bryan Wiedeman
10,203 Pointsi have
private Context mContext;
at the top. is there someone else it needs referenced?
Seth Kroger
56,413 Pointspublic DayAdapter(Context context, Day[] days) {
mContext = context; // <--needs to be set here.
mDays = days;
}
Bryan Wiedeman
10,203 Pointsi see now. i made that change and am getting a new error though
10-14 15:48:22.018 1040-1040/com.example.paxie.stormy E/AndroidRuntime: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getImportantForAccessibility()' on a null object reference
Bryan Wiedeman
10,203 Pointsok nvm figured that one out. had to change return null to return convertView. Thank you!