Java的Andr​​oid的Canvas.drawText（...）的所有屏幕一样大 [英] Java Android Canvas.drawText(...) equally big in all screens

问题描述

我画的文字canvas.drawText（...）在我的项目，并测试它针对不同的设备。

I have drawn text with canvas.drawText(...) in my project and tested it against with different devices.

然而，文本的大小而变化了很多，从画面到屏幕上。

However, the size of the text varies a lot from screen to screen.

我曾尝试与来乘以getResources（）。getDisplayMetrics（）。密度但仍然是略微不一样的大小。

I have tried to multiply it with getResources().getDisplayMetrics().density but they are still slightly not the same size.

有没有办法让文字拥有在不同设备上相同尺寸的？

Is there a way to get the text to have the same size on different devices?

推荐答案

您好，你可以看看这个帖子， HTTP ：？//catchthecows.com/ p = 72 ，我认为它可以帮助你。
    @覆盖
    保护无效onSizeChanged（INT W，INT小时，INT oldw，诠释oldh）{
        super.onSizeChanged（W，H，oldw，oldh）;

hi you can look at this post , http://catchthecows.com/?p=72, i think it helps to you. @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh);

    // save view size
    mViewWidth = w;
    mViewHeight = h;

    // first determine font point size
    adjustTextSize();
    // then determine width scaling
    // this is done in two steps in case the
    // point size change affects the width boundary
    adjustTextScale();
}


void adjustTextSize() {
    mTextPaint.setTextSize(100);
    mTextPaint.setTextScaleX(1.0f);
    Rect bounds = new Rect();
    // ask the paint for the bounding rect if it were to draw this
    // text
    mTextPaint.getTextBounds(mText, 0, mText.length(), bounds);

    // get the height that would have been produced
    int h = bounds.bottom - bounds.top;

    // make the text text up 70% of the height
    float target = (float)mViewHeight*.7f;

    // figure out what textSize setting would create that height
    // of text
    float size  = ((target/h)*100f);

    // and set it into the paint
    mTextPaint.setTextSize(size);
}


void adjustTextScale() {
    // do calculation with scale of 1.0 (no scale)
    mTextPaint.setTextScaleX(1.0f);
    Rect bounds = new Rect();
    // ask the paint for the bounding rect if it were to draw this
    // text.
    mTextPaint.getTextBounds(mText, 0, mText.length(), bounds);

    // determine the width
    int w = bounds.right - bounds.left;

    // calculate the baseline to use so that the
    // entire text is visible including the descenders
    int text_h = bounds.bottom-bounds.top;
    mTextBaseline=bounds.bottom+((mViewHeight-text_h)/2);

    // determine how much to scale the width to fit the view
    float xscale = ((float) (mViewWidth-getPaddingLeft()-getPaddingRight())) / w;

    // set the scale for the text paint
    mTextPaint.setTextScaleX(xscale);
}

@Override
protected void onDraw(Canvas canvas) {
    // let the ImageButton paint background as normal
    super.onDraw(canvas);

    // draw the text
    // position is centered on width
    // and the baseline is calculated to be positioned from the
    // view bottom
    canvas.drawText(mText, mViewWidth/2, mViewHeight-mTextBaseline, mTextPaint);
}

https://github.com/catchthecows/BigTextButton

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