更改列表視圖的行的字體

Question

我想更改ListView每行的字體。 我的列表視圖是一個自定義列表視圖，該列表的每一行都是一個textview，我想通過以下代碼設置該textview的facetype：

   Typeface font = Typeface.createFromAsset(getAssets(), "fonts/titr.ttf");  
   mainlisttext.setTypeface(font); 

但是在運行時我得到了錯誤，這是我的LogCat：

    03-25 11:46:02.242: W/dalvikvm(5841): threadid=1: thread exiting with uncaught exception (group=0x40a4a1f8)
03-25 11:46:02.281: E/AndroidRuntime(5841): FATAL EXCEPTION: main
03-25 11:46:02.281: E/AndroidRuntime(5841): java.lang.RuntimeException: Unable to start activity ComponentInfo{Dic.proj.pkg/Dic.proj.pkg.DictionaryActivity}: java.lang.NullPointerException
03-25 11:46:02.281: E/AndroidRuntime(5841):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
03-25 11:46:02.281: E/AndroidRuntime(5841):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
03-25 11:46:02.281: E/AndroidRuntime(5841):     at android.app.ActivityThread.access$600(ActivityThread.java:123)
03-25 11:46:02.281: E/AndroidRuntime(5841):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
03-25 11:46:02.281: E/AndroidRuntime(5841):     at android.os.Handler.dispatchMessage(Handler.java:99)
03-25 11:46:02.281: E/AndroidRuntime(5841):     at android.os.Looper.loop(Looper.java:137)
03-25 11:46:02.281: E/AndroidRuntime(5841):     at android.app.ActivityThread.main(ActivityThread.java:4424)
03-25 11:46:02.281: E/AndroidRuntime(5841):     at java.lang.reflect.Method.invokeNative(Native Method)
03-25 11:46:02.281: E/AndroidRuntime(5841):     at java.lang.reflect.Method.invoke(Method.java:511)
03-25 11:46:02.281: E/AndroidRuntime(5841):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
03-25 11:46:02.281: E/AndroidRuntime(5841):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
03-25 11:46:02.281: E/AndroidRuntime(5841):     at dalvik.system.NativeStart.main(Native Method)
03-25 11:46:02.281: E/AndroidRuntime(5841): Caused by: java.lang.NullPointerException
03-25 11:46:02.281: E/AndroidRuntime(5841):     at Dic.proj.pkg.DictionaryActivity.onCreate(DictionaryActivity.java:152)
03-25 11:46:02.281: E/AndroidRuntime(5841):     at android.app.Activity.performCreate(Activity.java:4465)
03-25 11:46:02.281: E/AndroidRuntime(5841):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
03-25 11:46:02.281: E/AndroidRuntime(5841):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)

在獨立的textview中，這很好用，但是對於listview中的textview則不行！ 我該如何解決？

Answer 1

從路徑中刪除字體文件夾

Typeface font = Typeface.createFromAsset(getAssets(), "titr.ttf");
mainlisttext.setTypeface(font); 

Answer 2

您的TextView 主列表文本在那里為null，您不能通過這種方式為列表行分配自定義字體。 您可以做的是實現您的自定義適配器（活動中需要適配器的內部類），並使用新字體自定義所有行（您沒有說要使用什么適配器，所以我使用ArrayAdapter<String> ，相同的代碼可以應用於其他類型）：

private class CustomAdapter extends ArrayAdapter<String> {

    Typeface font;

    public CustomAdapter(Context context, int textViewResourceId,
            List<String> objects) {
        super(context, textViewResourceId, objects);
        font = Typeface.createFromAsset(getAssets(),
                "fonts/Roboto-Italic.ttf");
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        //  Note: this will work if your row layout is a single TextView with no other views in it,
        // if you have LinearLayouts or other views then search by id in the view returned by super.getView(position, convertView, parent) 
        TextView text = (TextView) super.getView(position, convertView,
                parent);
        text.setTypeface(font);
        return text;
    }

}