新增]查看更多＆QUOT;在TextView中后三线结束 [英] Add "View More" at the end of textview after 3 lines
本文介绍了新增]查看更多＆QUOT;在TextView中后三线结束的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想以后三行文本增加了更多的功能。文本中包含这是超过10行的描述。所以我们决定增加更多后三行文本。像：
I want to add "More" functionality after three lines of text. The text contains the description which is more than 10 lines. so we have decided to add "More" after three lines of text. Like:
在文本显示完整的描述，那么它应该显示减按钮，文字这又融为一体preSS TextView的末尾。
when the text is showing the complete description, then it should show "Less" button at the end of text which again compress the textview.
推荐答案
试试这个月帮助你的工作没问题。
Try this may helps you working fine with me.
package com.example.demo;
import android.app.Activity;
import android.os.Bundle;
import android.text.Html;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
import android.text.method.LinkMovementMethod;
import android.text.style.ClickableSpan;
import android.view.Menu;
import android.view.View;
import android.view.ViewTreeObserver;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.widget.TextView;
import android.widget.TextView.BufferType;
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() {
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), 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), 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), 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) {
if (viewMore) {
tv.setLayoutParams(tv.getLayoutParams());
tv.setText(tv.getTag().toString(), BufferType.SPANNABLE);
tv.invalidate();
makeTextViewResizable(tv, -1, "View Less", false);
} else {
tv.setLayoutParams(tv.getLayoutParams());
tv.setText(tv.getTag().toString(), BufferType.SPANNABLE);
tv.invalidate();
makeTextViewResizable(tv, 3, "View More", true);
}
}
}, str.indexOf(spanableText), str.indexOf(spanableText) + spanableText.length(), 0);
}
return ssb;
}
}
更新：从spaneble文本删除下划线
1）创建自定义ClickableSpan
1) Create Custom ClickableSpan
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);
}
@Override
public void onClick(View widget) {
}
}
2）改变 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) {
if (viewMore) {
tv.setLayoutParams(tv.getLayoutParams());
tv.setText(tv.getTag().toString(), BufferType.SPANNABLE);
tv.invalidate();
makeTextViewResizable(tv, -1, "View Less", false);
} else {
tv.setLayoutParams(tv.getLayoutParams());
tv.setText(tv.getTag().toString(), BufferType.SPANNABLE);
tv.invalidate();
makeTextViewResizable(tv, 3, "View More", true);
}
}
}, str.indexOf(spanableText), str.indexOf(spanableText) + spanableText.length(), 0);
}
return ssb;
}
输出：
这篇关于新增]查看更多＆QUOT;在TextView中后三线结束的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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