android - 设置 TextView 椭圆大小并在末尾添加更多 View

Question

我正在尝试设置 TextView 的椭圆大小。使用以下代码。我想在 3 个点后的截断字符串末尾添加“查看更多”。如果使用相同的 TextView 可以做到这一点，那就太好了，或者在单独的 TextView 中“查看更多”也可以。允许的最大行数为 4。我尝试设置第一个 TextView 的宽度，但它在前 3 行末尾留下了空白空间。请看下图。

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >

    <TextView
        android:id="@+id/tvReviewDescription"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:maxLines="4"
        android:text="I tend to shy away from restaurant chains, but wherever I go, PF Chang&apos;s has solidly good food and, like Starbucks, they&apos;re reliable. We were staying in Boston for a week and after a long day and blah blah blah blah... "
        android:textColor="@color/black"
        android:textSize="13dp" 
        android:maxLength="280"
        android:ellipsize="end"/>

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/tvReviewDescription"
        android:layout_alignParentRight="true"
        android:text="@string/label_view_more"
        android:textColor="@color/yellow" />
</RelativeLayout>

Answer 1

找到我的答案

   public static void makeTextViewResizable(final TextView tv, final int maxLine, final String expandText, final boolean viewMore) {

    if (tv.getTag() == null) {
        tv.setTag(tv.getText());
    }
    ViewTreeObserver vto = tv.getViewTreeObserver();
    vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {

        @SuppressWarnings("deprecation")
        @Override
        public void onGlobalLayout() {

            ViewTreeObserver obs = tv.getViewTreeObserver();
            obs.removeGlobalOnLayoutListener(this);
            if (maxLine == 0) {
                int lineEndIndex = tv.getLayout().getLineEnd(0);
                String text = tv.getText().subSequence(0, lineEndIndex - expandText.length() + 1) + " " + expandText;
                tv.setText(text);
                tv.setMovementMethod(LinkMovementMethod.getInstance());
                tv.setText(
                        addClickablePartTextViewResizable(Html.fromHtml(tv.getText().toString()), tv, maxLine, expandText,
                                viewMore), TextView.BufferType.SPANNABLE);
            } else if (maxLine > 0 && tv.getLineCount() >= maxLine) {
                int lineEndIndex = tv.getLayout().getLineEnd(maxLine - 1);
                String text = tv.getText().subSequence(0, lineEndIndex - expandText.length() + 1) + " " + expandText;
                tv.setText(text);
                tv.setMovementMethod(LinkMovementMethod.getInstance());
                tv.setText(
                        addClickablePartTextViewResizable(Html.fromHtml(tv.getText().toString()), tv, maxLine, expandText,
                                viewMore), TextView.BufferType.SPANNABLE);
            } else {
                int lineEndIndex = tv.getLayout().getLineEnd(tv.getLayout().getLineCount() - 1);
                String text = tv.getText().subSequence(0, lineEndIndex) + " " + expandText;
                tv.setText(text);
                tv.setMovementMethod(LinkMovementMethod.getInstance());
                tv.setText(
                        addClickablePartTextViewResizable(Html.fromHtml(tv.getText().toString()), tv, lineEndIndex, expandText,
                                viewMore), TextView.BufferType.SPANNABLE);
            }
        }
    });

}

private static SpannableStringBuilder addClickablePartTextViewResizable(final Spanned strSpanned, final TextView tv,
                                                                        final int maxLine, final String spanableText, final boolean viewMore) {
    String str = strSpanned.toString();
    SpannableStringBuilder ssb = new SpannableStringBuilder(strSpanned);

    if (str.contains(spanableText)) {


        ssb.setSpan(new MySpannable(false){
            @Override
            public void onClick(View widget) {
                if (viewMore) {
                    tv.setLayoutParams(tv.getLayoutParams());
                    tv.setText(tv.getTag().toString(), TextView.BufferType.SPANNABLE);
                    tv.invalidate();
                    makeTextViewResizable(tv, -1, "See Less", false);
                } else {
                    tv.setLayoutParams(tv.getLayoutParams());
                    tv.setText(tv.getTag().toString(), TextView.BufferType.SPANNABLE);
                    tv.invalidate();
                    makeTextViewResizable(tv, 3, ".. See More", true);
                }
            }
        }, str.indexOf(spanableText), str.indexOf(spanableText) + spanableText.length(), 0);

    }
    return ssb;

}

另一个类:-

import android.graphics.Color;
import android.text.TextPaint;
import android.text.style.ClickableSpan;
import android.view.View;

public class MySpannable extends ClickableSpan {

private boolean isUnderline = true;

/**
 * Constructor
 */
public MySpannable(boolean isUnderline) {
    this.isUnderline = isUnderline;
}

@Override
public void updateDrawState(TextPaint ds) {
    ds.setUnderlineText(isUnderline);
    ds.setColor(Color.parseColor("#1b76d3"));
}

@Override
public void onClick(View widget) {


 }
}

最后一步调用它:

DetailTv.setText(discription);
makeTextViewResizable(DetailTv, 3, "See More", true);