Unable to set font in BaseAdpater class?

Question

this is the getView function of classBinderData extends BaseAdapter:

public View getView(int position, View convertView, ViewGroup parent) {

    View vi = convertView;

    if (convertView == null) {
                    vi = inflater.inflate(R.layout.list_row, null);
                    holder = new ViewHolder();
                    holder.name = (TextView) vi.findViewById(R.id.name); 
                   vi.setTag(holder);
    } else {
                    holder = (ViewHolder) vi.getTag();
    }

    Typeface tf = Typeface.createFromAsset(vi.getContext().getAssets(), "fonts/Roboto_Thin.ttf");
    holder.name.setTypeface(tf);    
    return vi;
}`

adding the line: Typeface tf = Typeface.createFromAsset(vi.getContext().getAssets(), "fonts/Roboto_Thin.ttf");

makes the app crash.

So how to set font?

Edit

LogCat

FATAL EXCEPTION: main
java.lang.NullPointerException
at com.example.myapp.BinderData.getView(BinderData.java:65)
at android.widget.AbsListView.obtainView(AbsListView.java:2045)
at android.widget.ListView.measureHeightOfChildren(ListView.java:1244)
at android.widget.ListView.onMeasure(ListView.java:1155)
at android.view.View.measure(View.java:12853)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4806)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1386)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:677)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:558)
at android.view.View.measure(View.java:12853)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4806)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:298)
at android.view.View.measure(View.java:12853)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:829)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:558)
at android.view.View.measure(View.java:12853)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4806)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:298)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2111)
at android.view.View.measure(View.java:12853)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1065)
at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2455)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4424)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:817)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:584)
at dalvik.system.NativeStart.main(Native Method) 

Answer 1

public View getView(int position, View convertView, ViewGroup parent) {

View vi = convertView;

if (convertView == null) {
    vi = inflater.inflate(R.layout.list_row, null);
    holder = new ViewHolder();
    holder.name = (TextView) vi.findViewById(R.id.name); 
    Typeface tf = Typeface.createFromAsset(vi.getContext().getAssets(), "fonts/Roboto_Thin.ttf");
    holder.name.setTypeface(tf);    

    vi.setTag(holder);
} else {
    holder = (ViewHolder) vi.getTag();
}

     return vi;
}

TypeFace.createFromAsset is an heavy operation. Do it once when you retrieve the TextView from your layout

Also be sure that inside the assets folder you have created the folder fonts and that it contains Roboto_Thin.ttf