整篇textview文字排版混乱问题

解决textview排版混乱问题的自定义组件

最新推荐文章于 2021-05-29 13:05:24 发布

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最新推荐文章于 2021-05-29 13:05:24 发布

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分类专栏： Android 文章标签： textview 排版混乱

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本文介绍了一个自定义的JustifyTextView，用于解决在Android中使用textview展示大量文字时，因标点符号和中英文混排导致的尾部空白问题。通过调整文字间的间距实现最后一行的对齐。

当使用textview设置大量文字的时候，由于标点符号和中英文的原因，导致尾部有空白的情况，下面这个自定义textview比较好的解决了这个问题。

import android.content.Context;
import android.graphics.Canvas;
import android.text.Layout;
import android.text.StaticLayout;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.TextView;

public class JustifyTextView extends TextView {

	private int mLineY;
	private int mViewWidth;

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

	public JustifyTextView(Context context) {
		super(context);
	}
	
	@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 = (String) getText();
		mLineY = 0;
		mLineY += getTextSize();
		Layout layout = getLayout();
		for (int i = 0; i < layout.getLineCount(); i++) {
			int lineStart = layout.getLineStart(i);
			int lineEnd = layout.getLineEnd(i);
			String line = text.substring(lineStart, lineEnd);
			Log.e("lineEnd",lineEnd+"");
//			if(i==layout.getLineCount()-1){
//				lineEnd = (int) paint.measureText(line);
//			}
			float width = StaticLayout.getDesiredWidth(text, lineStart,
					lineEnd, getPaint());
			if (needScale(line)) {
				if(i==layout.getLineCount()-1){
					drawScaledText(canvas, lineStart, line, width,true);
				}else{
					drawScaledText(canvas, lineStart, line, width,false);
				}
			
			} else {
				canvas.drawText(line, 0, mLineY, paint);
			}

			mLineY += getLineHeight();
		}
	}

	private void drawScaledText(Canvas canvas, int lineStart, String line,
			float lineWidth,boolean boo) {
		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);
		}

		float d = (mViewWidth - lineWidth) / line.length() - 1;
		for (int i = 0; i < line.length(); i++) {
			String c = String.valueOf(line.charAt(i));
			float cw = StaticLayout.getDesiredWidth(c, getPaint());
			canvas.drawText(c, x, mLineY, getPaint());
			if(boo){
				x += cw;
			}else{
				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.length() == 0) {
			return false;
		} else {
			return line.charAt(line.length() - 1) != '\n';
		}
	}

}