android - 如何在android应用程序中使用自定义字体

Question

为了实现自定义字体，我在这里看到了几个例子，问题是不同的，我在一个抽象类中使用自定义字体，它在整个应用程序中使用，这是我的代码

 public abstract class X extends Activity implements OnClickListener {

    private Vibrator vibrator;
    private TextView TV_score;
    private TextView TV_hints;
    private ImageButton BTN_back;
        // Font path
    private String fontPath = "fonts/CarterOne.ttf";
    Typeface tf = Typeface.createFromAsset(getAssets(), fontPath);
    public static Context context;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Logger.log("onCreate " + this.getClass().getName());
        vibrator = (Vibrator) this.getSystemService(VIBRATOR_SERVICE);
        context = getBaseContext();
        SoundHandler.getInstance().initSounds(context);         
    }

通过调试尝试这里我得到空指针异常

Typeface tf = Typeface.createFromAsset(getAssets(), fontPath);

如何解决这个问题给出一些建议。

Answer 1

在activity的onCreate方法中创建Typeface对象

public abstract class X extends Activity implements OnClickListener {

private Vibrator vibrator;
private TextView TV_score;
private TextView TV_hints;
private ImageButton BTN_back;
    // Font path
private String fontPath = "fonts/CarterOne.ttf";
Typeface tf ;
public static Context context;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Logger.log("onCreate " + this.getClass().getName());
    vibrator = (Vibrator) this.getSystemService(VIBRATOR_SERVICE);
    context = getBaseContext();
    SoundHandler.getInstance().initSounds(context);   
    tf = Typeface.createFromAsset(getAssets(), fontPath);      
}