嘗試從字段'GlyphRun.color'讀取空對象引用

Question

我一直在努力獲得字體的類型與libgdx工作，我終於做到了。

但現在它拋出一個異常，我無法弄清楚。

java.lang.NullPointerException: Attempt to read from field 'com.badlogic.gdx.graphics.Color com.badlogic.gdx.graphics.g2d.GlyphLayout$GlyphRun.color' on a null object reference 
    at com.badlogic.gdx.graphics.g2d.GlyphLayout.setText(GlyphLayout.java:141) 
    at com.badlogic.gdx.graphics.g2d.BitmapFontCache.addText(BitmapFontCache.java:505) 
    at com.badlogic.gdx.graphics.g2d.BitmapFontCache.addText(BitmapFontCache.java:487) 
    at com.badlogic.gdx.graphics.g2d.BitmapFontCache.setText(BitmapFontCache.java:438) 
    at yt.agar.game.Screens.GameScreen.render(GameScreen.java:213) 
    at com.badlogic.gdx.Game.render(Game.java:46) 
    at com.badlogic.gdx.backends.android.AndroidGraphics.onDrawFrame(AndroidGraphics.java:459) 
    at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1522) 
    at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1239) 

GlyphLayout.java:141： https://github.com/libgdx/libgdx/blob/master/gdx/src/com/badlogic/gdx/graphics/g2d/GlyphLayout.java#L141

我畫的字體是這樣的：

BitmapFont font = assetManager.get('arial-96.otf'); 
font.draw(spriteBatch, "sample text", 10, 10); 

我產生bitmapfont這種方式，使用AssetManager。我嘗試了很多不同的字體，包括truetype字體。

FreetypeFontLoader.FreeTypeFontLoaderParameter font = new FreetypeFontLoader.FreeTypeFontLoaderParameter(); 
font.fontFileName = "fonts/arial.otf"; 
font.fontParameters.color = Color.WHITE; 
font.fontParameters.borderColor = Color.BLACK; 
font.fontParameters.borderWidth = 3; 
font.fontParameters.flip = true; 
font.fontParameters.characters = FreeTypeFontGenerator.DEFAULT_CHARS; 
font.fontParameters.size = 96; 

manager.load("arial-96.otf", BitmapFont.class, font); 

我看不出我做錯了什麼。

Answer 1

我想通過這種方式，它爲我工作的罰款：

public class TestGame extends Game { 

    private AssetManager assetManager; 
    private SpriteBatch spriteBatch; 

    @Override 
    public void create() { 

     assetManager=new AssetManager(); 
     spriteBatch=new SpriteBatch(); 
     FileHandleResolver resolver = new InternalFileHandleResolver(); 
     assetManager.setLoader(FreeTypeFontGenerator.class, new FreeTypeFontGeneratorLoader(resolver)); 
     assetManager.setLoader(BitmapFont.class, ".otf", new FreetypeFontLoader(resolver)); 
     FreetypeFontLoader.FreeTypeFontLoaderParameter size03Params = new FreetypeFontLoader.FreeTypeFontLoaderParameter(); 
     size03Params.fontFileName = "CHARLEMAGNESTD-BOLD.otf"; 
     size03Params.fontParameters.size = 96; 
     assetManager.load("CHARLEMAGNESTD-BOLD.otf", BitmapFont.class, size03Params); 

     assetManager.finishLoading(); 
    } 

    @Override 
    public void render() { 

     spriteBatch.begin(); 

     if(assetManager.update()){ 
      BitmapFont font=assetManager.get("CHARLEMAGNESTD-BOLD.otf"); 
      font.draw(spriteBatch,"HEOOOW",100,100); 
     } 

     spriteBatch.end(); 
    } 

    @Override 
    public void dispose() { 
     spriteBatch.dispose(); 
     assetManager.dispose(); 
    } 
}