3行后在TextView末尾添加“查看更多”[重复]
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【中文标题】3行后在TextView末尾添加“查看更多”[重复]【英文标题】:Add "View More" at the end of TextView after 3 lines [duplicate] 【发布时间】:2013-11-09 14:49:56 【问题描述】:我想在三行文本之后添加“更多”功能。文本包含超过 10 行的描述。所以我们决定在三行文字后面加上“更多”。喜欢:
当文本显示完整的描述时,它应该在文本末尾显示“Less”按钮,再次压缩TextView
。
【问题讨论】:
使用自定义的TextView.. 在此处查看 Aleks 的回答 ***.com/questions/12712081/…。 请看这个示例可能会有所帮助(这是从以前的答案中提取的我的应用程序要求的解决方案)。我们可以根据请求更新/增强库github.com/arshadbinhamza/ViewMore 【参考方案1】:试试这个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.removeOnGlobalLayoutListener(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(SpannableString(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:从跨度文本中删除下划线
-
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)
addClickablePartTextViewResizable()
方法的变化
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;
输出:
【讨论】:
为了解决换行\n问题,将Spanned strSpanned改为String,并在发送参数时去掉html.fromHtml。 如何改变view more的文字颜色!!! 能否请您提及如何更改“查看更多”和“查看更少”的文本颜色 @BirajZalavadia 对于所有项目,它在 RecyclerView 中无法完美运行。有什么建议吗? 不能在回收站视图中工作......【参考方案2】:这是一个简单的自定义ExpandableTextView
。它使用底部的 Compound Drawable,而不是使用 See More 文本:
public class ExpandableTextView extends TextView implements OnClickListener
private static final int MAX_LINES = 5;
private int currentMaxLines = Integer.MAX_VALUE;
public ExpandableTextView(Context context)
super(context);
setOnClickListener(this);
public ExpandableTextView(Context context, AttributeSet attrs, int defStyle)
super(context, attrs, defStyle);
setOnClickListener(this);
public ExpandableTextView(Context context, AttributeSet attrs)
super(context, attrs);
setOnClickListener(this);
@Override
protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter)
/* If text longer than MAX_LINES set DrawableBottom - I'm using '...' icon */
post(new Runnable()
public void run()
if (getLineCount()>MAX_LINES)
setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, R.drawable.icon_more_text);
else
setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0);
setMaxLines(MAX_LINES);
);
@Override
public void setMaxLines(int maxLines)
currentMaxLines = maxLines;
super.setMaxLines(maxLines);
/* Custom method because standard getMaxLines() requires API > 16 */
public int getMyMaxLines()
return currentMaxLines;
@Override
public void onClick(View v)
/* Toggle between expanded collapsed states */
if (getMyMaxLines() == Integer.MAX_VALUE)
setMaxLines(MAX_LINES);
else
setMaxLines(Integer.MAX_VALUE);
【讨论】:
这是我找到的最好的答案。真的真的。但是我可以得到 R.drawable.icon_more_text 的代码吗?那是什么? XML 还是照片?请。StylishTextView
来自哪里?
@WaiYanHein:可以是任何小图片,xml 或 png 都可以。我使用了一个带有三个点的图标。
@caffinatedmonkey 我刚刚将其更新为简单的 TextView。
很棒的解决方案兄弟。这甚至适用于滚动..非常感谢【参考方案3】:
如果字符串中有\r\n或\n,这将换行
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()
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(tv.getText()
.toString(), tv, maxLine, expandText,
viewMore), 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(tv.getText()
.toString(), tv, maxLine, expandText,
viewMore), 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(tv.getText()
.toString(), tv, lineEndIndex, expandText,
viewMore), BufferType.SPANNABLE);
);
private static SpannableStringBuilder addClickablePartTextViewResizable(
final String strSpanned, final TextView tv, final int maxLine,
final String spanableText, final boolean viewMore)
SpannableStringBuilder ssb = new SpannableStringBuilder(strSpanned);
if (strSpanned.contains(spanableText))
ssb.setSpan(
new ClickableSpan()
@Override
public void onClick(View widget)
if (viewMore)
tv.setLayoutParams(tv.getLayoutParams());
tv.setText(tv.getTag().toString(),
BufferType.SPANNABLE);
tv.invalidate();
makeTextViewResizable(tv, -5, "...Read Less",
false);
tv.setTextColor(Color.BLACK);
else
tv.setLayoutParams(tv.getLayoutParams());
tv.setText(tv.getTag().toString(),
BufferType.SPANNABLE);
tv.invalidate();
makeTextViewResizable(tv, 5, "...Read More",
true);
tv.setTextColor(Color.BLACK);
, strSpanned.indexOf(spanableText),
strSpanned.indexOf(spanableText) + spanableText.length(), 0);
return ssb;
【讨论】:
这是最好的,而且它的特殊字符非常好 如果我的文本视图是列表视图中一行的一部分,该怎么做? 我不明白我们应该使用哪一个?我有TextView
和String =Description;
我该如何应用你的方法呢?
在recyclerview中使用会崩溃。以上是关于3行后在TextView末尾添加“查看更多”[重复]的主要内容,如果未能解决你的问题,请参考以下文章