如何为列表视图实现getview（）

Question

如何为已创建的列表视图（以下代码）实现getView（）（如何创建getview（））。这样我可以改变的TextView项的字体和其它属性stylig

MainActivity.java

public class MainActivity extends Activity { 

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

ListView listView1 = (ListView) findViewById(R.id.listView1); 

String[] items = { "some", "fancy", "items", "to", "show" }; 

ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, 
      R.layout.listitem, items); 

listView1.setAdapter(adapter); 
} 

activity_main.xml中

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
tools:context=".MainActivity" > 

<ListView 
    android:id="@+id/listView1" 
    android:layout_height="fill_parent" 
    android:layout_width="fill_parent" /> 

</RelativeLayout> 

listview.xml

<?xml version="1.0" encoding="utf-8"?> 
<TextView xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
android:textSize="20sp" 
android:padding="22dp" 
android:gravity="center_horizontal" 
/> 

改变MainActivity.java

public class MainActivity extends Activity { 
    Context context; 
    ArrayAdapter<String> adapter; 
    String[] items = { "some", "fance", "rock", "shot", "trance" }; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    ListView listView1 = (ListView) findViewById(R.id.listView1); 




    adapter = new ArrayAdapter<String>(this, 
       R.layout.genre_list, items); 

    listView1.setAdapter(adapter);} 
    public View getView(int position, View convertView, ViewGroup parent) { 

    View row; 

    if (null == convertView) { 
     LayoutInflater mInflater = (LayoutInflater) context 
       .getSystemService(Activity.LAYOUT_INFLATER_SERVICE); 
    row = mInflater.inflate(R.layout.genre_list, null); 

    } else { 

    row = convertView; 

    } 

    TextView tv = (TextView)row.findViewById(android.R.id.title); 
    Typeface font = Typeface.createFromAsset(getAssets(),"roboto.ttf"); 
    Toast.makeText(getApplicationContext(), "font fetched!", 
     Toast.L ENGTH_LONG).show(); 
    tv.setText(items[position]); 
    tv.setTypeface(font); 
    return row; 

    } 

Answer 1

getView()是在适配器类的方法，像ArrayAdapter和SimpleCursorAdapter。您必须扩展适配器类，在您的情况ArrayAdapter，以访问getView()。

这是Android领先程序员Romain Guy的Google Talk讨论了详细扩展适配器的最佳实践。

---

这就是说，你可以更改字体和许多其他风格通过XML属性，你不一定需要创建一个自定义的适配器。

• How to change the font on the TextView?
• Styles and Themes和android:textAppearance

Answer 2

为TextView的更改字体，您将需要创建自定义ArrayAdapter。

Typeface font = Typeface.createFromAsset(getAssets(), 
           "yourfontname.ttf"); 

listView1.setListAdapter(new 
       ArrayAdapter<string>(this,R.layout.listitem, items) { 

@Override 

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

View row; 

if (null == convertView) { 

row = mInflater.inflate(R.layout.listitem, null); 

} else { 

row = convertView; 

} 

TextView tv = (TextView)row.findViewById(android.R.id.text1); 

tv.setText(items[position]); 
tv.setTypeface(font); 
return row; 

} 

});