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  • 固定textview大小,根据文字多少调整字体自适应textview大小

    /**
    * 文件名 AutoResizeTextView.java
    * 包含类名列表 com.haier.internet.conditioner.haierinternetconditioner2.view
    * 版本信息 版本号
    * 创建日期 2014年9月9日
    * 版权声明
    */

    package com.haier.internet.conditioner.haierinternetconditioner2.view;

    /**
    * 类名
    * @author 王洪贺<br/>
    * 实现的主要功能。
    * 创建日期 2014年9月9日
    */
    import android.content.Context;
    import android.graphics.Canvas;
    import android.text.Layout.Alignment;
    import android.text.StaticLayout;
    import android.text.TextPaint;
    import android.text.TextUtils;
    import android.util.AttributeSet;
    import android.util.TypedValue;
    import android.widget.TextView;

    public class AutoResizeTextView extends TextView {

    private static final int MAX_SIZE = 1000;

    private static final int MIN_SIZE = 5;

    private TextPaint mTextPaint;

    private float mSpacingMult = 1.0f;

    private float mSpacingAdd = 0.0f;

    private boolean needAdapt = false;

    private boolean adapting = false;

    public AutoResizeTextView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    init();
    }

    public AutoResizeTextView(Context context, AttributeSet attrs) {
    super(context, attrs);
    init();
    }

    public AutoResizeTextView(Context context) {
    super(context);
    init();
    }

    private void init() {
    mTextPaint = new TextPaint();
    }

    @Override
    protected void onDraw(Canvas canvas) {
    if (adapting) {
    return;
    }
    if (needAdapt) {
    adaptTextSize();
    } else {
    super.onDraw(canvas);
    }
    }

    private void adaptTextSize() {
    CharSequence text = getText();
    int viewWidth = getMeasuredWidth();
    int viewHeight = getMeasuredHeight();

    if (viewWidth == 0 || viewHeight == 0 || TextUtils.isEmpty(text)) {
    return;
    }

    adapting = true;
    /* binary search */
    int bottom = MIN_SIZE, top = MAX_SIZE, mid = 0;
    while (bottom <= top) {
    mid = (bottom + top) / 2;
    mTextPaint.setTextSize(mid);
    int textWidth = (int) mTextPaint.measureText(text, 0, text.length());
    int textHeight = getTextHeight(text, viewWidth);
    if (textWidth < viewWidth && textHeight < viewHeight) {
    bottom = mid + 1;
    } else {
    top = mid - 1;
    }
    }

    int newSize = mid - 1;
    setTextSize(TypedValue.COMPLEX_UNIT_PX, newSize);

    adapting = false;
    needAdapt = false;

    invalidate();
    }

    private int getTextHeight(CharSequence text, int targetWidth) {
    StaticLayout layout = new StaticLayout(text, mTextPaint, targetWidth,
    Alignment.ALIGN_NORMAL, mSpacingMult, mSpacingAdd, true);
    return layout.getHeight();
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);
    needAdapt = true;
    }

    @Override
    protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {
    super.onTextChanged(text, start, lengthBefore, lengthAfter);
    needAdapt = true;
    }

    @Override
    public void setLineSpacing(float add, float mult) {
    super.setLineSpacing(add, mult);
    mSpacingMult = mult;
    mSpacingAdd = add;
    }
    }

    方法有很多种,可以参考http://stackoverflow.com/questions/5033012/auto-scale-textview-text-to-fit-within-bounds

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  • 原文地址:https://www.cnblogs.com/dongweiq/p/3962880.html
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