因此，在进一步了解以下内容之后：https : //github.com/ufo22940268/android-justifiedtextview和TextView通常，我发现我的主要问题是我的方法。

理论上，使用缩放字符宽度的方法在理论上是合理的，但是这样做之后，线的宽度又发生了变化，因为看来线的宽度不是其各部分的总和。

我已经改变了方法，并从上面的链接中获得了灵感，因此在我的新方法中，我自己绘制了每个角色，而不是绘制了整个线条。如果文本需要对齐（基于自定义的“ justify”布尔属性），则将绘制线条并对其进行对齐，否则将绘制线条。

编辑：我已经更改了代码，以便它也支持RTL文本。我将在接下来的几天中将代码上传到某个地方。

结果如下：

这是代码：

public class DTextView extends AppCompatTextView {


    private boolean justify;
    private float textAreaWidth;
    private float spaceCharSize;
    private float lineY;

    public DTextView(Context context) {
        super(context);
    }

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

    public DTextView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(attrs);
    }

    /**
     * @param attrs the attributes from the xml
     *              This function loads all the parameters from the xml
     */
    private void init(AttributeSet attrs) {

        TypedArray ta = getContext().obtainStyledAttributes(attrs, R.styleable.DTextView, 0, 0);

        justify = ta.getBoolean(R.styleable.DTextView_justify, false);

        ta.recycle();
    }

    @Override
    protected void onDraw(Canvas canvas) {
        drawText(canvas);
    }

    private void drawText(Canvas canvas) {
        TextPaint paint = getPaint();
        paint.setColor(getCurrentTextColor());
        paint.drawableState = getDrawableState();
        textAreaWidth = getMeasuredWidth() - (getPaddingLeft() + getPaddingRight());

        spaceCharSize = paint.measureText(" ");

        String text = getText().toString();
        lineY = getTextSize();

        Layout textLayout = getLayout();

        if (textLayout == null)
            return;

        Paint.FontMetrics fm = paint.getFontMetrics();
        int textHeight = (int) Math.ceil(fm.descent - fm.ascent);
        textHeight = (int) (textHeight * getLineSpacingMultiplier() + textLayout.getSpacingAdd());

        for (int i = 0; i < textLayout.getLineCount(); i++) {

            int lineStart = textLayout.getLineStart(i);
            int lineEnd = textLayout.getLineEnd(i);

            float lineWidth = StaticLayout.getDesiredWidth(text, lineStart, lineEnd, paint);
            String line = text.substring(lineStart, lineEnd);

            if (line.charAt(line.length() - 1) == ' ') {
                line = line.substring(0, line.length() - 1);
            }

            if (justify && i < textLayout.getLineCount() - 1) {
                drawLineJustified(canvas, line, lineWidth);
            } else {
                canvas.drawText(line, 0, lineY, paint);
            }

            lineY += textHeight;
        }

    }

    private void drawLineJustified(Canvas canvas, String line, float lineWidth) {
        TextPaint paint = getPaint();

        float emptySpace = textAreaWidth - lineWidth;
        int spaces = line.split(" ").length - 1;
        float newSpaceSize = (emptySpace / spaces) + spaceCharSize;

        float charX = 0;

        for (int i = 0; i < line.length(); i++) {
            String character = String.valueOf(line.charAt(i));
            float charWidth = StaticLayout.getDesiredWidth(character, paint);
            if (!character.equals(" ")) {
                canvas.drawText(character, charX, lineY, paint);
            }

            if (character.equals(" ") && i != line.length() - 1)
                charX += newSpaceSize;
            else
                charX += charWidth;
        }

    }
}

和XML：

<il.co.drapp.views.text.DTextView
                android:layout_width="match_parent"
                android:inputType="textMultiLine|textNoSuggestions"
                app:justify="true"
                android:id="@+id/justifyText"
                android:text="@string/article_dummy_text"
                android:layout_height="wrap_content" />

感谢Aditya Vyas-Lakhan的链接