Android drawText包括文本换行

Question

我目前正在创建一个图像编辑器,并尝试使用canvas.drawText()在图像上绘制文本.到目前为止,我已经成功地做到了这一点,但是当用户输入的文本太长时,文本只会继续在页面外的一行上,并且不会将自身包裹到屏幕的宽度.我该怎么做呢？我尝试过使用静态布局,但似乎无法让它工作,有没有人有一个教程来做到这一点？

我使用静态布局绘制画布的功能:

 public Bitmap createImage(float scr_x,float scr_y,String user_text){

            Canvas canvas = new Canvas(image);

            scr_x = 100;
            scr_y = 100;
            final TextPaint tp = new TextPaint(Color.WHITE);     
            canvas.save();
            StaticLayout sl = new StaticLayout("" + user_text, tp, originalBitmap.getWidth(), Layout.Alignment.ALIGN_NORMAL, 1.0f, 0.0f, false);
            sl.draw(canvas);

         return image;
        }

好的,我已经更新了我的代码,但是当我尝试在图像上绘制时根本没有任何事情发生,我不知道为什么:

    public Bitmap createImage(String user_text) {
    // canvas object with bitmap image as constructor
    Canvas canvas = new Canvas(image);
    TextPaint tp = new TextPaint();
    tp.setColor(Color.RED);
    tp.setTextSize(50);
    tp.setTextAlign(Align.CENTER);
    tp.setAntiAlias(true);
    StaticLayout sl = new StaticLayout("" + user_text, tp,
            canvas.getWidth(), Layout.Alignment.ALIGN_NORMAL, 1, 0, false);
    canvas.translate(100, 100);
    sl.draw(canvas);
    return image;
}

staticlayout不是用来在画布上画画吗？

Answer 1

是的,StaticLayout 就是您用来在Canvas上绘制多行文本的用途.拯救自己一个痛苦的世界,不要考虑自己打破文本 - 你正走在正确的道路上.我不确定位图问题,但上面的第二个代码可以很好地在画布上为我绘制文本.

这是在画布上绘制布局的方法:http: //developer.android.com/reference/android/text/Layout.html#draw(android.graphics.Canvas)

Answer 2

public Bitmap drawMultilineTextToBitmap(Context gContext,
                                   int gResId,
                                   String gText) {

  // prepare canvas
  Resources resources = gContext.getResources();
  float scale = resources.getDisplayMetrics().density;
  Bitmap bitmap = BitmapFactory.decodeResource(resources, gResId);

  android.graphics.Bitmap.Config bitmapConfig = bitmap.getConfig();
  // set default bitmap config if none
  if(bitmapConfig == null) {
    bitmapConfig = android.graphics.Bitmap.Config.ARGB_8888;
  }
  // resource bitmaps are imutable,
  // so we need to convert it to mutable one
  bitmap = bitmap.copy(bitmapConfig, true);

  Canvas canvas = new Canvas(bitmap);

  // new antialiased Paint
  TextPaint paint=new TextPaint(Paint.ANTI_ALIAS_FLAG);
  // text color - #3D3D3D
  paint.setColor(Color.rgb(61, 61, 61));
  // text size in pixels
  paint.setTextSize((int) (14 * scale));
  // text shadow
  paint.setShadowLayer(1f, 0f, 1f, Color.WHITE);

  // set text width to canvas width minus 16dp padding
  int textWidth = canvas.getWidth() - (int) (16 * scale);

  // init StaticLayout for text
  StaticLayout textLayout = new StaticLayout(
    gText, paint, textWidth, Layout.Alignment.ALIGN_CENTER, 1.0f, 0.0f, false);

  // get height of multiline text
  int textHeight = textLayout.getHeight();

  // get position of text's top left corner
  float x = (bitmap.getWidth() - textWidth)/2;
  float y = (bitmap.getHeight() - textHeight)/2;

  // draw text to the Canvas center
  canvas.save();
  canvas.translate(x, y);
  textLayout.draw(canvas);
  canvas.restore();

  return bitmap;
}

来源：http : //www.skoumal.net/en/android-drawing-multiline-text-on-bitmap/