Android Custom Farsi Font for Views Using TypeFace

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="ir.mhdr.a071.MainActivity">

    <TextView
        android:id="@+id/textViewMessage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World 12!"
        android:layout_below="@+id/numberPicker"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="115dp" />

    <ir.mhdr.a071.CustomNumberPicker
        android:id="@+id/numberPicker"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:gravity="center" />

</RelativeLayout>

CustomNumberPicker.java

public class CustomNumberPicker extends NumberPicker {

    public CustomNumberPicker(Context context) {
        super(context);
    }

    public CustomNumberPicker(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public CustomNumberPicker(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    public void addView(View child) {
        super.addView(child);

        updateView(child);
    }

    @Override
    public void addView(View child, int index, android.view.ViewGroup.LayoutParams params) {
        super.addView(child, index, params);
        updateView(child);
    }

    @Override
    public void addView(View child, android.view.ViewGroup.LayoutParams params) {
        super.addView(child, params);
        updateView(child);
    }

    private void updateView(View view) {

        Typeface typeface = Typeface.createFromAsset(getContext().getAssets(), "fonts/BNazanin.ttf");

        if(view instanceof EditText) {
            ((EditText) view).setTypeface(typeface);
        }

        if (view instanceof TextView)
        {
            ((TextView) view).setTypeface(typeface);
        }
    }
}

MainActivity.java

public class MainActivity extends AppCompatActivity {

    TextView textViewMessage;
    CustomNumberPicker numberPicker;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        textViewMessage = (TextView) findViewById(R.id.textViewMessage);

        // the base way to do this in android
        // the font is placed on assets/fonts/BNazanin.ttf
        Typeface typeface = Typeface.createFromAsset(getAssets(), "fonts/BNazanin.ttf");
        textViewMessage.setTypeface(typeface);


        // for other views we need to extend view
        numberPicker = (CustomNumberPicker) findViewById(R.id.numberPicker);
        numberPicker.setMinValue(0);
        numberPicker.setMaxValue(99);
        numberPicker.setValue(34);
    }
}

References
https://github.com/mhdr/AndroidSamples/tree/master/071

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