Make a certain part of a android-textview align to

问题:

I have this TextView. Some parts of it is supposed to be aligned to the left and some parts to the right. How would I do this in Java?

Basicly I want the first line to align to the left, and the next line to the right and so on.

Anyone got a clue?

EDIT

I have tried to use HTML and then when that did not work I tried spans.

html attempt

textView.setText(Html.fromHtml("<p align=\"right\">THIS IS TO THE RIGHT</p>"));

And heres the span attempt

    String LeftText = "LEFT";
    String RightText = "RIGHT";

    final String resultText = LeftText + "  " + RightText;
    final SpannableString styledResultText = new SpannableString(resultText);
    styledResultText.setSpan(new AlignmentSpan.Standard(Alignment.ALIGN_OPPOSITE), LeftText.length() + 1, LeftText.length() + 2 +RightText.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    textView.setText(styledResultText);

But none of them seems to work.

回答1:

TextView resultTextView = new TextView(this);
final String resultText = LeftText + "  " + RightText;
final SpannableString styledResultText = new SpannableString(resultText);
styledResultText.setSpan(new AlignmentSpan.Standard(Alignment.ALIGN_OPPOSITE)
    , LeftText.length() + 2
    , LeftText.length() + 2 + RightText.length()
    , Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
resultTextView.setText(styledResultText);

Alignment.ALIGN_OPPOSITE is the equivalent for right side.

Alignment.ALIGN_NORMAL is the equivalent for left side.

回答2:

Here is a solution that works with Spannable, with the cavate that if the right and left are too wide, they will overlap on the same line. Since to do the Left/Right trick with a spannable requires a line feed between Left and Right, my fix is to add a spannable that reduces the line height to zero (i.e. overlapped lines) for the one linefeed and then restore normal line height after that.

    String fullText = leftText + "\n " + rightText;     // only works if  linefeed between them! "\n ";

    int fullTextLength = fullText.length();
    int leftEnd = leftText.length();
    int rightTextLength = rightText.length();

    final SpannableString s = new SpannableString(fullText);
    AlignmentSpan alignmentSpan = new AlignmentSpan.Standard(Layout.Alignment.ALIGN_OPPOSITE);
    s.setSpan(alignmentSpan, leftEnd, fullTextLength, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    s.setSpan(new SetLineOverlap(true), 1, fullTextLength-2, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    s.setSpan(new SetLineOverlap(false), fullTextLength-1, fullTextLength, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

And we have the small routine to handle the overlapping lines:

    private static class SetLineOverlap implements LineHeightSpan {
    private int originalBottom = 15;        // init value ignored
    private int originalDescent = 13;       // init value ignored
    private Boolean overlap;                // saved state
    private Boolean overlapSaved = false;   // ensure saved values only happen once

    SetLineOverlap(Boolean overlap) {
        this.overlap = overlap;
    }

    @Override
    public void chooseHeight(CharSequence text, int start, int end, int spanstartv, int v,
                             Paint.FontMetricsInt fm) {
        if (overlap) {
            if (!overlapSaved) {
                originalBottom = fm.bottom;
                originalDescent = fm.descent;
                overlapSaved = true;
            }
            fm.bottom += fm.top;
            fm.descent += fm.top;
        } else {
            // restore saved values
            fm.bottom = originalBottom;
            fm.descent = originalDescent;
            overlapSaved = false;
        }
    }
}

回答3:

Thanks for the tip, @Frank, but this was just enough:

public class LineOverlapSpan implements LineHeightSpan {
    @Override
    public void chooseHeight(final CharSequence text, final int start, final int end, final int spanstartv, final int v, final Paint.FontMetricsInt fm) {
        fm.bottom += fm.top;
        fm.descent += fm.top;
    }
}

Used like this:

CharSequence text = return new Truss()
        .append("LEFT")
        .pushSpan(LineOverlapSpan())
        .append("\n")
        .popSpan()
        .pushSpan(AlignmentSpan.Standard(Layout.Alignment.ALIGN_OPPOSITE))
        .append("RIGHT")
        .build()

where Truss is

A SpannableStringBuilder wrapper whose API doesn't make me want to stab my eyes out.

• Jake Wharton, https://gist.github.com/JakeWharton/11274467

回答4:

Two solution :

1) have a different text view for each line and set its gravity.

2) Use Html while loading data setting the alignment in html for it REF:how-to-display-html-in-textview This will not work align is not a supported tags Edited:

Also

3: will be to use a span.

回答5:

Simple.Adjust xml part in textview. Use layouts.If you want the textview to be in left

android:alignParentLeft="true" For more align details look this.

http://developer.android.com/reference/android/widget/RelativeLayout.LayoutParams.html

And this is also an example for different layouts.

http://www.androidhive.info/2011/07/android-layouts-linear-layout-relative-layout-and-table-layout/