java - Android 应用程序的自定义字体

Question

我试图在我的应用程序中添加自定义字体。创建 typeface 对象并将字体放入其中的方法有效。现在我想为自定义字体创建一个类以获得更清晰的代码。

CustomFont.java

public class CustomFont extends AppCompatActivity {

    private final Typeface typeface = Typeface.createFromAsset(getAssets(), "fonts/Slabo.ttf");

    public CustomFont(TextView textView) {
        textView.setTypeface(typeface);
    }
}

现在我正尝试将此字体添加到 textview:

    public class MainActivity extends AppCompatActivity {

    private Typeface typeface;
    private CustomFont customFont;
    private TextView textview;

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

        //typeface = Typeface.createFromAsset(getAssets(),  "fonts/Slabo.ttf"); // works
        textview = (TextView) findViewById(R.id.textviewTest);
        //textview.setTypeface(typeface); // works

        customFont = new CustomFont(textview);   // does not work

    }
}

但是如果我运行这个项目，我会得到这个异常:

java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.AssetManager android.content.Context.getAssets()' on a null object reference

Answer 1

试试这个:

TextView text = (TextView) findViewById(R.id.custom_font);
Typeface font = Typeface.createFromAsset(getAssets(), "yourfont.ttf");
text.setTypeface(font);