如何在Android TextView中使字母间的间距？

Question

我需要从photoshop布局进行设计.布局上有一些字体.设计师给了我这种字体.但是在Photoshop中的布局上,他使用字母之间的间距.我怎么能在android textView中实现这个？我找到了一个解决方案

回答stackoverflow

回答两个

但如果我让它myTextView extends TextView错了.如果我适应一个设计,在具有biger显示的设备上,字母之间的间距增加不成比例.

编辑

public class MyTextView extends TextView {
    private float letterSpacing = 0.0f;
    private CharSequence originalText = "";
    private Typeface typeface;

    public MyTextView(Context context) {
        this(context, null);
        isInEditMode();
    }

    public MyTextView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
        isInEditMode();
    }

    public MyTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        TypedArray attributesArray = getResources().obtainAttributes(attrs, R.styleable.MyTextView);
        letterSpacing = attributesArray.getDimension(R.styleable.MyTextView_letterSpacing, 0.0f);
        String fontName = attributesArray.getString(R.styleable.MyTextView_fontName);
        if(!this.isInEditMode()) {
            if (null == fontName) {
                typeface = Fonts.getBlockBertholdRegular(context);
            } else {
                typeface = Fonts.get(context, fontName);
            }
            super.setTypeface(typeface);
        }
        originalText = super.getText();
        applyLetterSpacing();
        this.invalidate();
    }

    public float getLetterSpacing() {
        return letterSpacing;
    }

    public void setLetterSpacing(float letterSpacing) {
        this.letterSpacing = letterSpacing;
        applyLetterSpacing();
    }

    @Override
    public void setText(CharSequence text, BufferType type) {
        originalText = text;
        applyLetterSpacing();
    }

    @Override
    public CharSequence getText() {
        return originalText;
    }

    private void applyLetterSpacing() {
        if (this == null || this.originalText == null) return;
        StringBuilder builder = new StringBuilder();
        for (int i = 0; i < originalText.length(); i++) {
            String c = "" + originalText.charAt(i);
            builder.append(c.toUpperCase());
            if (i + 1 < originalText.length()) {
                builder.append("\u00A0");
            }
        }
        SpannableString finalText = new SpannableString(builder.toString());
        if (builder.toString().length() > 1) {
            for (int i = 1; i < builder.toString().length(); i += 2) {
                finalText.setSpan(new ScaleXSpan((letterSpacing + 1) / 10), i, i + 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
            }
        }

        super.setText(finalText, BufferType.SPANNABLE);
        if(!this.isInEditMode()) {
            super.setTypeface(typeface);
        }
    }
}

Answer 1

尝试使用新的TextView API方法setLetterSpacing. 看这里

编辑

您还可以在字体内部创建自己的字体并将其应用于TextView.

Answer 2

从API 21开始，您可以使用

setLetterSpacing

文档可以在这里找到