Android open source TextView中的文本自动对齐

Android open source TextView中的文本自动对齐

Android open source:justifytext

https://github.com/ufo22940268/android-justifiedtextview

引用

compile 'me.biubiubiu.justifytext:library:1.1'

布局

<me.biubiubiu.justifytext.library.JustifyTextViewandroid:id="@+id/text"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="@string/user_lisence_information" />

相关修改

package com.fate.opensource_justifytext;import android.content.Context;import android.graphics.Canvas;import android.graphics.Paint;import android.text.Layout;import android.text.StaticLayout;import android.text.TextPaint;import android.util.AttributeSet;import android.widget.TextView;public class JustifyTextView extends TextView {    private int mLineY;    private int mViewWidth;    public static final String TWO_CHINESE_BLANK = "  ";    public JustifyTextView(Context context, AttributeSet attrs) {        super(context, attrs);    }    @Override    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {        super.onLayout(changed, left, top, right, bottom);    }    @Override    protected void onDraw(Canvas canvas) {        TextPaint paint = getPaint();        paint.setColor(getCurrentTextColor());        paint.drawableState = getDrawableState();        mViewWidth = getMeasuredWidth();        String text = getText().toString();        mLineY = 0;        mLineY += getTextSize();        Layout layout = getLayout();        // layout.getLayout()在4.4.3出现NullPointerException        if (layout == null) {            return;        }        Paint.FontMetrics fm = paint.getFontMetrics();        int textHeight = (int) (Math.ceil(fm.descent - fm.ascent));        textHeight = (int) (textHeight * layout.getSpacingMultiplier() + layout.getSpacingAdd());        //解决了最后一行文字间距过大的问题        for (int i = 0; i < layout.getLineCount(); i++) {            int lineStart = layout.getLineStart(i);            int lineEnd = layout.getLineEnd(i);            float width = StaticLayout.getDesiredWidth(text, lineStart, lineEnd, getPaint());            String line = text.substring(lineStart, lineEnd);            if(i < layout.getLineCount() - 1) {                if (needScale(line)) {                    drawScaledText(canvas, lineStart, line, width);                } else {                    canvas.drawText(line, 0, mLineY, paint);                }            } else {                canvas.drawText(line, 0, mLineY, paint);            }            mLineY += textHeight;        }    }    private void drawScaledText(Canvas canvas, int lineStart, String line, float lineWidth) {        float x = 0;        if (isFirstLineOfParagraph(lineStart, line)) {            String blanks = "  ";            canvas.drawText(blanks, x, mLineY, getPaint());            float bw = StaticLayout.getDesiredWidth(blanks, getPaint());            x += bw;            line = line.substring(3);        }        int gapCount = line.length() - 1;        int i = 0;        if (line.length() > 2 && line.charAt(0) == 12288                && line.charAt(1) == 12288) {            String substring = line.substring(0, 2);            float cw = StaticLayout.getDesiredWidth(substring, getPaint());            canvas.drawText(substring, x, mLineY, getPaint());            x += cw;            i += 2;        }        float d = (mViewWidth - lineWidth) / gapCount;        for (; i < line.length(); i++) {            String c = String.valueOf(line.charAt(i));            float cw = StaticLayout.getDesiredWidth(c, getPaint());            canvas.drawText(c, x, mLineY, getPaint());            x += cw + d;        }    }    private boolean isFirstLineOfParagraph(int lineStart, String line) {        return line.length() > 3 && line.charAt(0) == ' ' && line.charAt(1) == ' ';    }    private boolean needScale(String line) {        if (line == null || line.length() == 0) {            return false;        } else {            return line.charAt(line.length() - 1) != '\n';        }    }}

相关链接

https://github.com/ufo22940268/android-justifiedtextview/issues/1
http://www.cnblogs.com/guojing1991/p/4845011.html