为 ListView 设置字体 [英] Set TypeFace for ListView
问题描述
我有 2 个用于列表视图的 XML 文件.一个用于视图，另一个用于首先使用.note_list.XML 是:
I have 2 XML file for list View. One for views and other for use first. note_list.XML is :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="10dip" >
<Button
android:id="@+id/allNotes_btn_refresh_list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/all_note_refresh_list" />
<ListView
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="match_parent" />
</LinearLayout>
和 list_otem.XML 是:
and list_otem.XML is :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/list_lbl_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone" />
<TextView
android:id="@+id/list_lbl_subject"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="@+id/list_lbl_date"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall" />
</LinearLayout>
在下面的代码中，我为列表设置了适配器:
in below code, i set adapter for list:
ArrayList<HashMap<String, String>> noteList;
ListView lv;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.note_list);
noteList = new ArrayList<HashMap<String, String>>();
lv = getListView();
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
String note_id = ((TextView) view
.findViewById(R.id.list_lbl_id)).getText().toString();
Intent i = new Intent(getApplicationContext(), NoteDetail.class);
i.putExtra("note_id", note_id);
startActivityForResult(i, 100);
}
});
}
public class LoadAllNotes extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(AllNotes.this);
pDialog.setMessage("???? ??? ????...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
noteList.clear();
}
protected String doInBackground(String... args) {
UserFunctions userFunctions = new UserFunctions();
jSon = userFunctions.getAllNotes(userId);
Log.i("AllNotes >> jSon >>", jSon.toString());
return null;
}
protected void onPostExecute(String file_url) {
pDialog.dismiss();
try {
if (jSon.has(KEY_SUCCESS)) {
String success = jSon.getString(KEY_SUCCESS);
if (success.equals("1")) {
notes = jSon.getJSONObject("notes");
for (int i = 0; i < notes.length(); i++) {
JSONObject c = notes.getJSONObject(Integer
.toString(i));
Log.i("JSONObject c >>", c.toString());
String id = c.getString(KEY_NOTE_ID);
String subject = c.getString(KEY_NOTE_SUBJECT);
String date = c.getString(KEY_NOTE_DATE);
HashMap<String, String> map = new HashMap<String, String>();
map.put(KEY_NOTE_ID, id);
map.put(KEY_NOTE_SUBJECT, subject);
map.put(KEY_NOTE_DATE, date);
noteList.add(map);
}
}
}
} catch (JSONException e) {
e.printStackTrace();
}
runOnUiThread(new Runnable() {
public void run() {
ListAdapter adapter = new SimpleAdapter(AllNotes.this,
noteList, R.layout.list_item, new String[] {
KEY_NOTE_ID, KEY_NOTE_SUBJECT,
KEY_NOTE_DATE }, new int[] {
R.id.list_lbl_id, R.id.list_lbl_subject,
R.id.list_lbl_date });
setListAdapter(adapter);
}
});
}
}
如何在 item_list.XML 中为 TextViews 设置字体?我在java代码中为内容视图设置了note_list.所以无法访问 list_item.xml 的视图.谢谢你帮助我.
How can i set type face for TextViews in item_list.XML? I set note_list for content view in java code. so can't access to views of list_item.xml. thanks for helping me.
推荐答案
你需要重写SimpleAdapter的getView(int position, View convertView, ViewGroup parent) 方法并将结果转换为 TextView.这对于 R.layout.list_item 布局来说应该是安全的，尽管您可能需要仔细检查一下.
You'll need to override the SimpleAdapter's getView(int position, View convertView, ViewGroup parent) method and cast the result to a TextView. That should be safe to do for the R.layout.list_item layout, although you may want to double check that.
从那里，设置字体照常工作.
From there, setting a typeface works as usual.
代码段，放置在 SimpleAdapter 的(匿名)扩展中:
Snippet, to be placed inside an (anonymous) extension of SimpleAdapter:
Typeface mTypeface = ... // only needs to be initialised once.
@Override public View getView(int position, View convertView, ViewGroup parent) {
View view = super.getView(position, convertView, parent);
TextView textview = (TextView) view;
textview.setTypeface(mTypeface);
return textview;
}
如果，也许在未来的某个时候，您将拥有一个由多个 TextView 组成的更复杂的布局，我会考虑实现您自己的 TextView 扩展代码>阵列适配器.有很多关于如何去做的例子(也可以查看 ViewHolder/RowWrapper 模式)，它会给你完全的控制权.
If, perhaps at some point in the future, you're going to have a more complex layout made out of more than just a single TextView, I'd consider implementing your own extension of ArrayAdapter. There are heaps of examples on how to go about that (also look up the ViewHolder/RowWrapper pattern) and it'll give you full control.
下面的示例代码.
public class TypefacedSimpleAdapter extends SimpleAdapter {
private final Typeface mTypeface;
public TypefacedSimpleAdapter(Context context, List<? extends Map<String, ?>> data, int resource, String[] from, int[] to) {
super(context, data, resource, from, to);
mTypeface = Typeface.createFromAsset(context.getAssets(), /* typeface */);
}
@Override public View getView(int position, View convertView, ViewGroup parent) {
View view = super.getView(position, convertView, parent);
TextView textview = (TextView) view;
textview.setTypeface(mTypeface);
return textview;
}
}
复制粘贴上面的类并确保根据您的要求设置字体字段.然后替换当前的SimpleAdapter；即这样的事情:
Copy-paste the class above and make sure to set up the type face field as per your requirements. Then replace the current SimpleAdapter; i.e. something like this:
ListAdapter adapter = new TypefacedSimpleAdapter(AllNotes.this,
noteList, R.layout.list_item, new String[] {
KEY_NOTE_ID, KEY_NOTE_SUBJECT,
KEY_NOTE_DATE }, new int[] {
R.id.list_lbl_id, R.id.list_lbl_subject,
R.id.list_lbl_date }
);
请注意，我实际上并没有编译或运行任何这些.我会让你来填补任何空白和/或进行更正.
Note that I didn't actually compile or run any of this. I'll leave it up to you to fill in any gaps and/or make corrections.
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