Performance issue on custom font TextView

Question

I have a custom TextView, with a personalized font attribute:

public class TextViewPlus extends TextView {     private static final String TAG = "TextViewPlus";     public TextViewPlus(Context context) {         super(context);     }     public TextViewPlus(Context context, AttributeSet attrs) {         // This is called all the time I scroll my ListView         // and it make it very slow.          super(context, attrs);         setCustomFont(context, attrs);     }     public TextViewPlus(Context context, AttributeSet attrs, int defStyle) {         super(context, attrs, defStyle);         setCustomFont(context, attrs);     }     private void setCustomFont(Context ctx, AttributeSet attrs) {         TypedArray a = ctx.obtainStyledAttributes(attrs, R.styleable.TextViewPlus);         String customFont = a.getString(R.styleable.TextViewPlus_customFont);         setCustomFont(ctx, customFont);         a.recycle();     }     public boolean setCustomFont(Context ctx, String asset) {         Typeface tf = null;         try {             tf = Typeface.createFromAsset(ctx.getAssets(), asset);               setTypeface(tf);          } catch (Exception e) {             Log.e(TAG, "Could not get typeface: "+e.getMessage());             return false;         }         return true;     } } 

I'm using it in my XML files with the attribute customFont="ArialRounded.ttf", and it is working quite well.

I'm using this TextViewPlus in a ListView, populated with an ArrayAdapter.

TextViewPlus dataText = (TextViewPlus) itemView.findViewById(R.id.data_text); dataText.setText("My data String"); 

My problem is that the performance, when I'm scrolling the ListView, are terrible! Very slow and full of lags. The TextViewPlus constructor n°2 it's called all the time i scroll the list.

If I change TextViewPlus in a normal TextView, and use dataText.setTypeface(myFont), everything is smood and is working well.

How can I use my TextViewPlus without performance issue?

Answer 1

Why don't you keep the created typface object in memory so that you don't create every time the text view is getting created.

Following is a sample class that creates and cache the typeface object:

public class TypeFaceProvider {      public static final String TYPEFACE_FOLDER = "fonts";     public static final String TYPEFACE_EXTENSION = ".ttf";      private static Hashtable<String, Typeface> sTypeFaces = new Hashtable<String, Typeface>(         4);      public static Typeface getTypeFace(Context context, String fileName) {     Typeface tempTypeface = sTypeFaces.get(fileName);      if (tempTypeface == null) {         String fontPath = new StringBuilder(TYPEFACE_FOLDER).append('/').append(fileName).append(TYPEFACE_EXTENSION).toString();         tempTypeface = Typeface.createFromAsset(context.getAssets(), fontPath);         sTypeFaces.put(fileName, tempTypeface);     }      return tempTypeface;     } }