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嘿，我想将其中一个TextViews的TypeFace更改为外部字体..我该怎么做？
代码：在ListView行中更改TextView的属性xml
public class English extends Activity {
<...>
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.quran_english);
listview=(ListView) findViewById(R.id.QuranEnglishListView);
<..add into list..>
SimpleAdapter adapter = new SimpleAdapter(
this,
list,
R.layout.quran_english_row,
new String[] {"Arabic","English"},
new int[] {R.id.QuranEnglishTextViewArabic,R.id.QuranEnglishTextViewEnglish});
listview.setAdapter(adapter);
XML每行（quran_english_row.xml）：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" android:orientation="vertical">
<LinearLayout android:gravity="right" android:layout_height="wrap_content" android:id="@+id/linearLayout1" android:layout_width="fill_parent">
<TextView android:textSize="21px" android:text="TextView" android:id="@+id/QuranEnglishTextViewArabic" android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
</LinearLayout>
<TextView android:textSize="21px" android:text="TextView" android:id="@+id/QuranEnglishTextViewEnglish" android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
</LinearLayout>
XML对于该布局（quran_english.xml）：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" android:orientation="vertical">
<ListView android:id="@+id/QuranEnglishListView" android:layout_width="fill_parent" android:layout_height="fill_parent"></ListView>
</LinearLayout>
此崩溃，因为空指针的：
((TextView) findViewById(R.id.QuranEnglishTextViewArabic)).setTypeface(Typeface.createFromAsset(getAssets(),"dejavusans.ttf"));
那么我怎样才能到达行中的TextView来改变它的TypeFace？由于