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安卓 EditText 提示文字大小

android
92

如何减小EditText提示文本的大小？

2
我认为没有必要调整提示的大小。你为什么想这样做呢？ - Praveen
4
提示字体大小非常大，所以我需要将其减小2sp。 - Sasikumar
1
我曾经遇到过同样的问题。我们正在实现一个拨号应用程序，因此拨打的号码可能非常大，而提示文本需要更小以适应所有内容。感谢@Jeka提供的解决方案！ - Bradford2000
1
<string name="name"><font size="20">名称</font><small>(按照文档)</small></string> - Sanket Parchande
13个回答
0

您不仅可以更改提示的大小，还可以更改其字体和样式。我使用 SpannableString 和 MetricAffectingSpan 成功解决了这个问题。

1）创建自定义的 Hint 对象：

import android.graphics.Typeface;
import android.text.SpannableString;
import android.text.Spanned;
import android.text.style.MetricAffectingSpan;

public class CustomHint extends SpannableString
{
    public CustomHint(final CharSequence source, final int style)
    {
        this(null, source, style, null);
    }

    public CustomHint(final CharSequence source, final Float size)
    {
        this(null, source, size);
    }

    public CustomHint(final CharSequence source, final int style, final Float size)
    {
        this(null, source, style, size);
    }

    public CustomHint(final Typeface typeface, final CharSequence source, final int style)
    {
        this(typeface, source, style, null);
    }

    public CustomHint(final Typeface typeface, final CharSequence source, final Float size)
    {
        this(typeface, source, null, size);
    }

    public CustomHint(final Typeface typeface, final CharSequence source, final Integer style, final Float size)
    {
        super(source);

        MetricAffectingSpan typefaceSpan = new CustomMetricAffectingSpan(typeface, style, size);
        setSpan(typefaceSpan, 0, source.length(), Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
    }
}

2) 创建自定义的 MetricAffectingSpan 对象：

import android.graphics.Typeface;
import android.text.TextPaint;
import android.text.style.MetricAffectingSpan;

public class CustomMetricAffectingSpan extends MetricAffectingSpan
{
    private final Typeface _typeface;
    private final Float    _newSize;
    private final Integer  _newStyle;

    public CustomMetricAffectingSpan(Float size)
    {
        this(null, null, size);
    }

    public CustomMetricAffectingSpan(Float size, Integer style)
    {
        this(null, style, size);
    }

    public CustomMetricAffectingSpan(Typeface type, Integer style, Float size)
    {
        this._typeface = type;
        this._newStyle = style;
        this._newSize = size;
    }

    @Override
    public void updateDrawState(TextPaint ds)
    {
        applyNewSize(ds);
    }

    @Override
    public void updateMeasureState(TextPaint paint)
    {
        applyNewSize(paint);
    }

    private void applyNewSize(TextPaint paint)
    {
        if (this._newStyle != null)
            paint.setTypeface(Typeface.create(this._typeface, this._newStyle));
        else
            paint.setTypeface(this._typeface);

        if (this._newSize != null)
            paint.setTextSize(this._newSize);
    }
}

3) 使用：

Typeface newTypeface = Typeface.createFromAsset(getAssets(), "AguafinaScript-Regular.ttf");
CustomHint customHint = new CustomHint(newTypeface, "Enter some text", Typeface.BOLD_ITALIC, 60f);
        //        CustomHint customHint = new CustomHint(newTypeface, "Enter some text", Typeface.BOLD_ITALIC);
        //        CustomHint customHint = new CustomHint(newTypeface, "Enter some text", 60f);
        //        CustomHint customHint = new CustomHint("Enter some text", Typeface.BOLD_ITALIC, 60f);
        //        CustomHint customHint = new CustomHint("Enter some text", Typeface.BOLD_ITALIC);
        //        CustomHint customHint = new CustomHint("Enter some text", 60f);

customEditText.setHint(customHint);
0

我需要为真正的文本设置比提示更大的字体大小。

public static class LargeSizeTextWatcher implements TextWatcher {

    private final EditText mEditText;
    private final int mOriginalSize;
    private final int mLargeSize;

    private int mLastLength;

    TrackingNumberTextWatcher(EditText editText) {
        mEditText = editText;
        mOriginalSize = (int) editText.getTextSize();
        mLargeSize = editText.getResources().getDimensionPixelSize(R.dimen.text_size_large);

        mLastLength = editText.length();
        if (mLastLength != 0) {
            mEditText.setTextSize(TypedValue.COMPLEX_UNIT_PX, mLargeSize);
        }
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
    }

    @Override
    public void afterTextChanged(Editable s) {
        int length = s.length();
        if (length == 0) {
            mEditText.setTextSize(TypedValue.COMPLEX_UNIT_PX, mOriginalSize);
        } else if (mLastLength == 0) {
            mEditText.setTextSize(TypedValue.COMPLEX_UNIT_PX, mLargeSize);
        }
        mLastLength = length;
    }
}
0

使用onFocusChanged()监听器来更改提示字体大小也是一种选择，因为addTextChangeListener()不会在用户单击文本字段时触发，并且闪烁的光标将调整为提示字体。

此外，与TextChangeListener不同，无需单独设置初始提示字体大小。

class EditTextWithHintSize {
 init {
        val typedArray = context.obtainStyledAttributes(attrs,
                R.styleable.EditTextWithHintSize, 0, defStyle)
        try {
            hintFontSize = typedArray.getDimension(R.styleable.EditTextWithHintSize_hint_font_size, textSize)
            fontSize = textSize

            if (length() == 0) {
                setTextSize(TypedValue.COMPLEX_UNIT_PX, hintFontSize)
            }
        } catch (e: Exception) {
            hintFontSize = textSize
            fontSize = textSize
        } finally {
            typedArray.recycle()
        }
    }

    override fun onFocusChanged(focused: Boolean, direction: Int, previouslyFocusedRect: Rect?) {
        super.onFocusChanged(focused, direction, previouslyFocusedRect)

        if (focused) {
            setTextSize(TypedValue.COMPLEX_UNIT_PX, fontSize)
        } else {
            if (length() == 0) {
                setTextSize(TypedValue.COMPLEX_UNIT_PX, hintFontSize)
            } else {
                setTextSize(TypedValue.COMPLEX_UNIT_PX, fontSize)
            }
        }
    }
}
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