编辑:问题来自模拟器,错误没有出现在真实设备上:(
我正在尝试在自定义视图中绘制一些文本,并且必须在那里进行测量但是Paint.getTextBounds()的值返回的高度比实际文本高出约30%,这使得所有内容都显得古怪。
我发现了这个:Android Paint: .measureText() vs .getTextBounds()并尝试将解决方案代码添加到我自己的onDraw中,并且看到了与我的代码中相同的测量错误。这是结果的图片:
比较: 图像从Android Paint: .measureText() vs .getTextBounds()
复制请注意第一张图片中文字上方的间距。什么想法可能导致这个?或者有其他方法来测量绘制的字符串的高度吗?
这是onDraw方法:
@Override
public void onDraw(Canvas canvas){
// canvas.drawColor(color_Z1);
// r.set(0, 0, (int)(width*progress), height);
// paint.setColor(color_Z2);
//// canvas.drawRect(r, paint);
// textPaint.getTextBounds(text, 0, text.length(), r);
// canvas.drawRect(r, paint);
// canvas.drawText(text, 0, r.height(), textPaint);
final String s = "Hello. I'm some text!";
Paint p = new Paint();
Rect bounds = new Rect();
p.setTextSize(60);
p.getTextBounds(s, 0, s.length(), bounds);
float mt = p.measureText(s);
int bw = bounds.width();
Log.i("LCG", String.format(
"measureText %f, getTextBounds %d (%s)",
mt,
bw, bounds.toShortString())
);
bounds.offset(0, -bounds.top);
p.setStyle(Style.STROKE);
canvas.drawColor(0xff000080);
p.setColor(0xffff0000);
canvas.drawRect(bounds, p);
p.setColor(0xff00ff00);
canvas.drawText(s, 0, bounds.bottom, p);
}
答案 0 :(得分:0)
我没有测试你的代码,但我没有看到Paint.getTextBounds()的任何问题:
public class TextBoundsTest extends View {
private Paint paint;
private Rect bounds;
public TextBoundsTest(Context context) {
super(context);
paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setTextSize(32);
bounds = new Rect();
}
@Override
protected void onDraw(Canvas canvas) {
String text = "this is my text";
paint.getTextBounds(text, 0, text.length(), bounds);
Log.d(TAG, "onDraw " + bounds);
int x = (getWidth() - bounds.width()) / 2;
int y = 70;
paint.setColor(0xff008800);
bounds.offset(x, y);
canvas.drawRect(bounds, paint);
paint.setColor(0xffeeeeee);
canvas.drawText(text, x, y, paint);
}
}
在Activity.onCreate中添加:
TextBoundsTest view = new TextBoundsTest(this);
setContentView(view);
结果是: