[英]Android canvas.drawText() not showing
所以,我有这个问题,我的Android文本绘制在背景图像上的画布上没有显示。 我的代码:
@Override
public void draw(Canvas canvas) {
final float scaleFactorX = getWidth() / WIDTH;
final float scaleFactorY = getHeight() / HEIGHT;
if(canvas != null) {
final int savedState = canvas.save();
canvas.scale(scaleFactorX, scaleFactorY);
Paint textPaint = new Paint();
textPaint.setColor(Color.RED);
textPaint.setTextSize(20);
textPaint.setAntiAlias(true);
canvas.drawBitmap(background, 0, 0, null);
canvas.drawBitmap(button_start, (canvas.getWidth() - button_start.getScaledWidth(canvas)) / 2, canvas.getHeight() / 4, null);
canvas.drawText("Test text", 0, 0, textPaint);
canvas.restoreToCount(savedState);
}
}
有谁知道我做错了什么?
基线的y轴不为0,试试这个
Paint textPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG);
textPaint.setColor(Color.RED);
textPaint.setTextSize((int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 20, getResources().getDisplayMetrics()));
textPaint.setTextAlign(Align.LEFT);
FontMetrics metric = textPaint.getFontMetrics();
int textHeight = (int) Math.ceil(metric.descent - metric.ascent);
int y = (int)(textHeight - metric.descent);
canvas.drawText("text", 0, y, textPaint);
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