android – 在3行之后在textview末尾添加“查看更多”

我希望在三行文本后添加“更多”功能.该文本包含超过10行的描述.所以我们决定在三行文字之后添加“更多”.喜欢：

当文本显示完整描述时,它应该在文本末尾显示“Less”按钮,再次压缩textview.

解决方法:

试试这可能会帮助你和我一起工作.

 public class MainActivity extends Activity {
    TextView tv;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv = (TextView) findViewById(R.id.tv);
        makeTextViewResizable(tv, 3, "View More", true);
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    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 OnGlobalLayoutListener() {
            @SuppressWarnings("deprecation")
            @Override
            public void onGlobalLayout() {
                String text;
                int lineEndindex;
                ViewTreeObserver obs = tv.getViewTreeObserver();
                obs.removeGlobalOnLayoutListener(this);
                if (maxLine == 0) {
                    lineEndindex = tv.getLayout().getLineEnd(0);
                    text = tv.getText().subSequence(0, lineEndindex - expandText.length() + 1) + " " + expandText;
                } else if (maxLine > 0 && tv.getLineCount() >= maxLine) {
                    lineEndindex = tv.getLayout().getLineEnd(maxLine - 1);
                    text = tv.getText().subSequence(0, lineEndindex - expandText.length() + 1) + " " + expandText;
                } else {
                    lineEndindex = tv.getLayout().getLineEnd(tv.getLayout().getLineCount() - 1);
                    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), 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 ClickableSpan() {
                @Override
                public void onClick(View widget) {
                        tv.setLayoutParams(tv.getLayoutParams());
                        tv.setText(tv.getTag().toString(), BufferType.SPANNABLE);
                        tv.invalidate();
                    if (viewMore) {
                        makeTextViewResizable(tv, -1, "View Less", false);
                    } else {
                        makeTextViewResizable(tv, 3, "View More", true);
                    }
                }
            }, str.indexOf(spanableText), str.indexOf(spanableText) + spanableText.length(), 0);
        }
        return ssb;
    }
}

更新：从spaneble文本中删除UnderLine

1)创建自定义ClickableSpan

public class MySpannable extends ClickableSpan {
    private boolean isUnderline = false;
    /**
     * Constructor
     */
    public MySpannable(boolean isUnderline) {
        this.isUnderline = isUnderline;
    }
    @Override
    public void updateDrawState(TextPaint ds) {
        ds.setUnderlineText(isUnderline);
        ds.setColor(Color.parseColor("#343434"));
    }
    @Override
    public void onClick(View widget) {
    }
}

2)更改addClickablePartTextViewResizable()方法

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) {
                        tv.setLayoutParams(tv.getLayoutParams());
                        tv.setText(tv.getTag().toString(), BufferType.SPANNABLE);
                        tv.invalidate();
                    if (viewMore) {
                        makeTextViewResizable(tv, -1, "View Less", false);
                    } else {
                        makeTextViewResizable(tv, 3, "View More", true);
                    }
                }
            }, str.indexOf(spanableText), str.indexOf(spanableText) + spanableText.length(), 0);
        }
        return ssb;
    }