适合边界的文本(1行)

让文本缩小到适合一行的边界:

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:autoSizeTextType="uniform"
    android:lines:"1"
/>

以下是我为那些还在找工作的人找到的一些东西:

1)这里有一个解决方案，递归重新绘制的textview，直到它适合。这意味着字面上看着你的文本缩小到合适的位置，但至少当它完成时它是合适的。代码需要一些调整才能实现，但基本上已经完成了。

2)你可以试着把一个自定义的解决方案像这样，或dunni的类在这里，这是我所做的使用getPaint().measureText(str)来搜索正确的大小，但它得到了很多混乱，因为我需要它只包装在空白…

3)你可以继续寻找——我已经尝试了数不清的选择。泰德关于StaticLayout的建议对我来说没有回报，但也许有一些东西;我尝试使用StaticLayout.getEllipsis(line)来确定文本是否离开屏幕，但没有效果。在这里可以看到我的帖子(目前没有回复)。

Android 4.x的一个变通方案:

我找到了AutoResizeTextView，它在我的Android 2.1模拟器上工作得很好。我非常喜欢它。但不幸的是，它在我自己的4.0.4手机和4.1模拟器上失败了。经过尝试，我发现它可以通过在xml中的AutoResizeTextView类中添加以下属性轻松解决:

android：ellipsize=“none” android：singleLine=“true”

有了上面的两行，现在AutoResizeTextView在我的2.1和4.1模拟器和我自己的4.0.4手机上完美地工作。

希望这对你有所帮助。: -)

警告，Android蜂巢和冰淇淋三明治有bug

android版本:3.1 - 4.04有一个错误，setTextSize()内部的TextView只工作第一次(第一次调用)。

Bug描述如下:http://code.google.com/p/android/issues/detail?id=22493 http://code.google.com/p/android/issues/detail?id=17343#c9

解决方法是添加新的行字符文本分配给TextView之前改变大小:

final String DOUBLE_BYTE_SPACE = "\u3000";
textView.append(DOUBLE_BYTE_SPACE);

我在我的代码中使用它如下:

final String DOUBLE_BYTE_SPACE = "\u3000";
AutoResizeTextView textView = (AutoResizeTextView) view.findViewById(R.id.aTextView);
String fixString = "";
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.HONEYCOMB_MR1
   && android.os.Build.VERSION.SDK_INT <= android.os.Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1) {  
    fixString = DOUBLE_BYTE_SPACE;
}
textView.setText(fixString + "The text" + fixString);

我将这个“\u3000”字符添加到文本的左侧和右侧，以保持文本居中。如果你把它对齐到左边，那么只追加到右边。当然，它也可以嵌入到AutoResizeTextView小部件中，但我希望将修复代码保留在外部。

我结合了上面的一些建议，用二分法制作了一个上下伸缩的图。它还在宽度范围内缩放。

/**
 *               DO WHAT YOU WANT TO PUBLIC LICENSE
 *                    Version 2, December 2004
 *
 * Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>
 *
 * Everyone is permitted to copy and distribute verbatim or modified
 * copies of this license document, and changing it is allowed as long
 * as the name is changed.
 *
 *            DO WHAT YOU WANT TO PUBLIC LICENSE
 *   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
 *
 *  0. You just DO WHAT YOU WANT TO.
 */

import android.content.Context;
import android.text.Layout.Alignment;
import android.text.StaticLayout;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.widget.TextView;

/**
 * Text view that auto adjusts text size to fit within the view. If the text
 * size equals the minimum text size and still does not fit, append with an
 * ellipsis.
 * 
 * @author Chase Colburn
 * @since Apr 4, 2011
 */
public class AutoResizeTextView extends TextView {

    // Minimum text size for this text view
    public static final float MIN_TEXT_SIZE = 10;

    // Minimum text size for this text view
    public static final float MAX_TEXT_SIZE = 128;

    private static final int BISECTION_LOOP_WATCH_DOG = 30;

    // Interface for resize notifications
    public interface OnTextResizeListener {
        public void onTextResize(TextView textView, float oldSize, float newSize);
    }

    // Our ellipse string
    private static final String mEllipsis = "...";

    // Registered resize listener
    private OnTextResizeListener mTextResizeListener;

    // Flag for text and/or size changes to force a resize
    private boolean mNeedsResize = false;

    // Text size that is set from code. This acts as a starting point for
    // resizing
    private float mTextSize;

    // Temporary upper bounds on the starting text size
    private float mMaxTextSize = MAX_TEXT_SIZE;

    // Lower bounds for text size
    private float mMinTextSize = MIN_TEXT_SIZE;

    // Text view line spacing multiplier
    private float mSpacingMult = 1.0f;

    // Text view additional line spacing
    private float mSpacingAdd = 0.0f;

    // Add ellipsis to text that overflows at the smallest text size
    private boolean mAddEllipsis = true;

    // Default constructor override
    public AutoResizeTextView(Context context) {
        this(context, null);
    }

    // Default constructor when inflating from XML file
    public AutoResizeTextView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    // Default constructor override
    public AutoResizeTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        mTextSize = getTextSize();
    }

    /**
     * When text changes, set the force resize flag to true and reset the text
     * size.
     */
    @Override
    protected void onTextChanged(final CharSequence text, final int start,
            final int before, final int after) {
        mNeedsResize = true;
        // Since this view may be reused, it is good to reset the text size
        resetTextSize();
    }

    /**
     * If the text view size changed, set the force resize flag to true
     */
    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        if (w != oldw || h != oldh) {
            mNeedsResize = true;
        }
    }

    /**
     * Register listener to receive resize notifications
     * 
     * @param listener
     */
    public void setOnResizeListener(OnTextResizeListener listener) {
        mTextResizeListener = listener;
    }

    /**
     * Override the set text size to update our internal reference values
     */
    @Override
    public void setTextSize(float size) {
        super.setTextSize(size);
        mTextSize = getTextSize();
    }

    /**
     * Override the set text size to update our internal reference values
     */
    @Override
    public void setTextSize(int unit, float size) {
        super.setTextSize(unit, size);
        mTextSize = getTextSize();
    }

    /**
     * Override the set line spacing to update our internal reference values
     */
    @Override
    public void setLineSpacing(float add, float mult) {
        super.setLineSpacing(add, mult);
        mSpacingMult = mult;
        mSpacingAdd = add;
    }

    /**
     * Set the upper text size limit and invalidate the view
     * 
     * @param maxTextSize
     */
    public void setMaxTextSize(float maxTextSize) {
        mMaxTextSize = maxTextSize;
        requestLayout();
        invalidate();
    }

    /**
     * Return upper text size limit
     * 
     * @return
     */
    public float getMaxTextSize() {
        return mMaxTextSize;
    }

    /**
     * Set the lower text size limit and invalidate the view
     * 
     * @param minTextSize
     */
    public void setMinTextSize(float minTextSize) {
        mMinTextSize = minTextSize;
        requestLayout();
        invalidate();
    }

    /**
     * Return lower text size limit
     * 
     * @return
     */
    public float getMinTextSize() {
        return mMinTextSize;
    }

    /**
     * Set flag to add ellipsis to text that overflows at the smallest text size
     * 
     * @param addEllipsis
     */
    public void setAddEllipsis(boolean addEllipsis) {
        mAddEllipsis = addEllipsis;
    }

    /**
     * Return flag to add ellipsis to text that overflows at the smallest text
     * size
     * 
     * @return
     */
    public boolean getAddEllipsis() {
        return mAddEllipsis;
    }

    /**
     * Reset the text to the original size
     */
    public void resetTextSize() {
        if (mTextSize > 0) {
            super.setTextSize(TypedValue.COMPLEX_UNIT_PX, mTextSize);
            // mMaxTextSize = mTextSize;
        }
    }

    /**
     * Resize text after measuring
     */

    @Override
    protected void onLayout(boolean changed, int left, int top, int right,
            int bottom) {
        if (changed || mNeedsResize) {
            int widthLimit = (right - left) - getCompoundPaddingLeft()
                    - getCompoundPaddingRight();
            int heightLimit = (bottom - top) - getCompoundPaddingBottom()
                    - getCompoundPaddingTop();
            resizeText(widthLimit, heightLimit);
        }
        super.onLayout(changed, left, top, right, bottom);
    }

    /**
     * Resize the text size with default width and height
     */
    public void resizeText() {

        // Height and width with a padding as a percentage of height
        int heightLimit = getHeight() - getPaddingBottom() - getPaddingTop();
        int widthLimit = getWidth() - getPaddingLeft() - getPaddingRight();
        resizeText(widthLimit, heightLimit);
    }

    /**
     * Resize the text size with specified width and height
     * 
     * @param width
     * @param height
     */
    public void resizeText(int width, int height) {
        CharSequence text = getText();

        // Do not resize if the view does not have dimensions or there is no
        // text
        if (text == null || text.length() == 0 || height <= 0 || width <= 0
                || mTextSize == 0) {
            return;
        }

        // Get the text view's paint object
        TextPaint textPaint = getPaint();

        // Store the current text size
        float oldTextSize = textPaint.getTextSize();

        // Bisection method: fast & precise
        float lower = mMinTextSize;
        float upper = mMaxTextSize;
        int loop_counter = 1;
        float targetTextSize = (lower + upper) / 2;
        int textHeight = getTextHeight(text, textPaint, width, targetTextSize);
        int textWidth = getTextWidth(text, textPaint, width, targetTextSize);

        while (loop_counter < BISECTION_LOOP_WATCH_DOG && upper - lower > 1) {
            targetTextSize = (lower + upper) / 2;
            textHeight = getTextHeight(text, textPaint, width, targetTextSize);
            textWidth = getTextWidth(text, textPaint, width, targetTextSize);
            if (textHeight > (height) || textWidth > (width))
                upper = targetTextSize;
            else
                lower = targetTextSize;
            loop_counter++;
        }

        targetTextSize = lower;
        textHeight = getTextHeight(text, textPaint, width, targetTextSize);

        // If we had reached our minimum text size and still don't fit, append
        // an ellipsis
        if (mAddEllipsis && targetTextSize == mMinTextSize
                && textHeight > height) {
            // Draw using a static layout
            // modified: use a copy of TextPaint for measuring
            TextPaint paintCopy = new TextPaint(textPaint);
            paintCopy.setTextSize(targetTextSize);
            StaticLayout layout = new StaticLayout(text, paintCopy, width,
                    Alignment.ALIGN_NORMAL, mSpacingMult, mSpacingAdd, false);
            // Check that we have a least one line of rendered text
            if (layout.getLineCount() > 0) {
                // Since the line at the specific vertical position would be cut
                // off,
                // we must trim up to the previous line
                int lastLine = layout.getLineForVertical(height) - 1;
                // If the text would not even fit on a single line, clear it
                if (lastLine < 0) {
                    setText("");
                }
                // Otherwise, trim to the previous line and add an ellipsis
                else {
                    int start = layout.getLineStart(lastLine);
                    int end = layout.getLineEnd(lastLine);
                    float lineWidth = layout.getLineWidth(lastLine);
                    float ellipseWidth = paintCopy.measureText(mEllipsis);

                    // Trim characters off until we have enough room to draw the
                    // ellipsis
                    while (width < lineWidth + ellipseWidth) {
                        lineWidth = paintCopy.measureText(text.subSequence(
                                start, --end + 1).toString());
                    }
                    setText(text.subSequence(0, end) + mEllipsis);
                }
            }
        }

        // Some devices try to auto adjust line spacing, so force default line
        // spacing
        // and invalidate the layout as a side effect
        setTextSize(TypedValue.COMPLEX_UNIT_PX, targetTextSize);
        setLineSpacing(mSpacingAdd, mSpacingMult);

        // Notify the listener if registered
        if (mTextResizeListener != null) {
            mTextResizeListener.onTextResize(this, oldTextSize, targetTextSize);
        }

        // Reset force resize flag
        mNeedsResize = false;
    }

    // Set the text size of the text paint object and use a static layout to
    // render text off screen before measuring
    private int getTextHeight(CharSequence source, TextPaint originalPaint,
            int width, float textSize) {
        // modified: make a copy of the original TextPaint object for measuring
        // (apparently the object gets modified while measuring, see also the
        // docs for TextView.getPaint() (which states to access it read-only)
        TextPaint paint = new TextPaint(originalPaint);
        // Update the text paint object
        paint.setTextSize(textSize);
        // Measure using a static layout
        StaticLayout layout = new StaticLayout(source, paint, width,
                Alignment.ALIGN_NORMAL, mSpacingMult, mSpacingAdd, true);
        return layout.getHeight();
    }

    // Set the text size of the text paint object and use a static layout to
    // render text off screen before measuring
    private int getTextWidth(CharSequence source, TextPaint originalPaint,
            int width, float textSize) {
        // Update the text paint object
        TextPaint paint = new TextPaint(originalPaint);
        // Draw using a static layout
        paint.setTextSize(textSize);

        StaticLayout layout = new StaticLayout(source, paint, width,
                Alignment.ALIGN_NORMAL, mSpacingMult, mSpacingAdd, true);

        return (int) layout.getLineWidth(0);
    }
}

扩展TextView和覆盖onDraw与下面的代码。它将保持文本纵横比，但将其大小填充空间。如果需要，您可以轻松地修改代码以进行拉伸。

  @Override
  protected void onDraw(@NonNull Canvas canvas) {
    TextPaint textPaint = getPaint();
    textPaint.setColor(getCurrentTextColor());
    textPaint.setTextAlign(Paint.Align.CENTER);
    textPaint.drawableState = getDrawableState();

    String text = getText().toString();
    float desiredWidth = getMeasuredWidth() - getPaddingLeft() - getPaddingRight() - 2;
    float desiredHeight = getMeasuredHeight() - getPaddingTop() - getPaddingBottom() - 2;
    float textSize = textPaint.getTextSize();

    for (int i = 0; i < 10; i++) {
      textPaint.getTextBounds(text, 0, text.length(), rect);
      float width = rect.width();
      float height = rect.height();

      float deltaWidth = width - desiredWidth;
      float deltaHeight = height - desiredHeight;

      boolean fitsWidth = deltaWidth <= 0;
      boolean fitsHeight = deltaHeight <= 0;

      if ((fitsWidth && Math.abs(deltaHeight) < 1.0)
          || (fitsHeight && Math.abs(deltaWidth) < 1.0)) {
        // close enough
        break;
      }

      float adjustX = desiredWidth / width;
      float adjustY = desiredHeight / height;

      textSize = textSize * (adjustY < adjustX ? adjustY : adjustX);

      // adjust text size
      textPaint.setTextSize(textSize);
    }
    float x = desiredWidth / 2f;
    float y = desiredHeight / 2f - rect.top - rect.height() / 2f;
    canvas.drawText(text, x, y, textPaint);
  }