[英]Setting multiple different Typefaces to the TextViews in a ListView
我有一個ListView,它顯示TextViews的列表。 我希望每個TextView都以適當的字體顯示。 作為字體String []數組的一部分出現在ListView中的字體名稱的拼寫與創建字體時的拼寫相同。
ListView fontsListView = (ListView) this.view.findViewById(R.id.MenuLayout);
final String[] fonts = new String[] {
"Aclonica",
"Amino-Regular",
};
ArrayList<String> fontsList = new ArrayList<String>();
fontsList.addAll( Arrays.asList(fonts) );
ArrayAdapter<String> listAdapter = new ArrayAdapter<String>(getActivity(), R.layout.fonts_simple_row, fontsList);
final TextView[] textViewArray = new TextView[0];
for( int i = 0; i <= fonts.length - 1; i++) {
textViewArray[i].setTypeface(Typeface.createFromAsset(getActivity().getAssets(), "fonts/" + fonts[i] + ".ttf"));
}
fontsListView.setAdapter(listAdapter);
和XML:
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#ffffff"
android:id="@+id/rowTextView"
android:textSize="20sp"
android:gravity="center_horizontal"
android:padding="10dp"
android:typeface="sans"
android:fontFamily="sans-serif-light" />
為什么我不能在ListView中獲得每個TextView正確的字體?
ArrayAdapter<String> listAdapter = new ArrayAdapter<String>(getApplicationContext(),R.layout.fonts_simple_row,value) {
@Override
public View getView(int position, View convertView,ViewGroup parent) {
View view = super.getView(position, convertView, parent);
TextView textView = (TextView) view.findViewById(R.id.rowTextView);
textView.setTypeface(Typeface.createFromAsset(getActivity().getAssets(),"fonts/" + fonts[position] + ".ttf"));
return view;
}
};
fontsListView.setAdapter(arrayAdapter);
您應該使用自定義數組適配器,並在get view方法上設置字體。
public class MySimpleArrayAdapter extends ArrayAdapter<String> {
private final Context context;
private final String[] values;
public MySimpleArrayAdapter(Context context, String[] values) {
super(context, R.layout.rowlayout, values);
this.context = context;
this.values = values;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View rowView = inflater.inflate(R.layout.rowlayout, parent, false);
TextView textView = (TextView) rowView.findViewById(R.id.label);
textView.setText(values[position]);
String s = values[position];
if (s.equals("Arial")) {
// set textView font to arial
} else if (s.equals("Roboto")){
// set textView font to roboto
}
return rowView;
}
}
僅創建一次字體並使用。 避免在getview方法中創建字體。如果不保持可重用性,它將在每次滾動時創建字體。
使用ViewHolder模式在listview中獲得更好的性能
下面,我嘗試給出兩種方法。 我也在評論中給出了解釋。 請檢查它是否可以幫助您。
public class AdapterFontViewHolder extends ArrayAdapter<String> {
private final Context context;
private final String[] values;
Typeface typefaceArial, typefaceRoboto;
private Typeface[] fonts;
public AdapterFontViewHolder(Context context, String[] values) {
super(context, R.layout.rowlayout, values);
this.context = context;
this.values = values;
// Create Typeface only once and use it.. Path you can change as per your directory
fonts = new Typeface[]{
Typeface.createFromAsset(context.getAssets(), "fonts/Aclonica.ttf"),
Typeface.createFromAsset(context.getAssets(), "fonts/Amino-Regular.ttf"),
};
}
public class ViewHolder {
TextView textView;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder vHolder;
if (convertView == null) {
// Create Instnce of view if its null & store object in ViewHolder (a class)
vHolder = new ViewHolder();
convertView = LayoutInflater.from(context).inflate(R.layout.rowlayout, parent, false);
vHolder.textView = (TextView) convertView.findViewById(R.id.label);
//Set ViewHolder instance in convertview in a tag as a object
convertView.setTag(vHolder);
} else {
// reuse as already converview is instansiated & it holds ViewHolder instance in tag
vHolder = (ViewHolder) convertView.getTag();
}
vHolder.textView.setText(values[position]);
//Here From Fonts array take Typeface
vHolder.textView.setTypeface(fonts[position]);
return convertView;
}
}
設置適配器
ListView fontsListView = (ListView) this.view.findViewById(R.id.MenuLayout);
AdapterFontViewHolder listAdapter = new AdapterFontViewHolder(getActivity(), R.layout.fonts_simple_row, fontsList);
fontsListView.setAdapter(listAdapter);
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