ExpandTextView.class
import android.annotation.SuppressLint;
import android.content.Context;
import android.os.Build;
import android.text.Layout;
import android.text.SpannableString;
import android.text.Spanned;
import android.text.StaticLayout;
import android.text.method.LinkMovementMethod;
import android.util.AttributeSet;
import android.view.View;
import android.widget.TextView;
import com.yimiao100.sale.yimiaomanager.R;
@SuppressLint("AppCompatCustomView")
public class ExpandTextView extends TextView {
private String originText;// 原始内容文本
private int initWidth = 0;// TextView可展示宽度
private int mMaxLines = 3;// TextView最大行数
private SpannableString SPAN_CLOSE = null;// 收起的文案(颜色处理)
private SpannableString SPAN_EXPAND = null;// 展开的文案(颜色处理)
private String TEXT_EXPAND = " 展开描述问题>";
private String TEXT_CLOSE = " <收起";
public ExpandTextView(Context context) {
super(context);
initCloseEnd();
}
public ExpandTextView(Context context, AttributeSet attrs) {
super(context, attrs);
initCloseEnd();
}
public ExpandTextView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initCloseEnd();
}
/**
* 设置TextView可显示的最大行数
* @param maxLines 最大行数
*/
@Override
public void setMaxLines(int maxLines) {
this.mMaxLines = maxLines;
super.setMaxLines(maxLines);
}
/**
* 初始化TextView的可展示宽度
* @param width
*/
public void initWidth(int width){
initWidth = width;
}
/**
* 收起的文案(颜色处理)初始化
*/
private void initCloseEnd(){
String content = TEXT_EXPAND;
SPAN_CLOSE = new SpannableString(content);
ButtonSpan span = new ButtonSpan(getContext(), new View.OnClickListener(){
@Override
public void onClick(View v) {
ExpandTextView.super.setMaxLines(Integer.MAX_VALUE);
setExpandText(originText);
}
}, R.color.colorAccent);
SPAN_CLOSE.setSpan(span, 0, content.length(), Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
}
/**
* 展开的文案(颜色处理)初始化
*/
private void initExpandEnd(){
String content = TEXT_CLOSE;
SPAN_EXPAND = new SpannableString(content);
ButtonSpan span = new ButtonSpan(getContext(), new View.OnClickListener(){
@Override
public void onClick(View v) {
ExpandTextView.super.setMaxLines(mMaxLines);
setCloseText(originText);
}
}, R.color.colorAccent);
SPAN_EXPAND.setSpan(span, 0, content.length(), Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
}
public void setCloseText(CharSequence text) {
if(SPAN_CLOSE == null){
initCloseEnd();
}
boolean appendShowAll = false;// true 不需要展开收起功能， false 需要展开收起功能
originText = text.toString();
// SDK >= 16 可以直接从xml属性获取最大行数
int maxLines = 0;
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN) {
maxLines = getMaxLines();
} else{
maxLines = mMaxLines;
}
String workingText = new StringBuilder(originText).toString();
if (maxLines != -1) {
Layout layout = createWorkingLayout(workingText);
if (layout.getLineCount() > maxLines) {
//获取一行显示字符个数，然后截取字符串数
workingText = originText.substring(0, layout.getLineEnd(maxLines - 1)).trim();// 收起状态原始文本截取展示的部分
String showText = originText.substring(0, layout.getLineEnd(maxLines - 1)).trim() + "..." + SPAN_CLOSE;
Layout layout2 = createWorkingLayout(showText);
// 对workingText进行-1截取，直到展示行数==最大行数，并且添加 SPAN_CLOSE 后刚好占满最后一行
while (layout2.getLineCount() > maxLines) {
int lastSpace = workingText.length()-1;
if (lastSpace == -1) {
break;
}
workingText = workingText.substring(0, lastSpace);
layout2 = createWorkingLayout(workingText + "..." + SPAN_CLOSE);
}
appendShowAll = true;
workingText = workingText + "...";
}
}
setText(workingText);
if (appendShowAll) {
// 必须使用append，不能在上面使用+连接，否则spannable会无效
append(SPAN_CLOSE);
setMovementMethod(LinkMovementMethod.getInstance());
}
}
public void setExpandText(String text) {
if(SPAN_EXPAND == null){
initExpandEnd();
}
Layout layout1 = createWorkingLayout(text);
Layout layout2 = createWorkingLayout(text + TEXT_CLOSE);
// 展示全部原始内容时 如果 TEXT_CLOSE 需要换行才能显示完整，则直接将TEXT_CLOSE展示在下一行
if(layout2.getLineCount() > layout1.getLineCount()){
setText(originText + "\n");
}else{
setText(originText);
}
append(SPAN_EXPAND);
setMovementMethod(LinkMovementMethod.getInstance());
}
//返回textview的显示区域的layout，该textview的layout并不会显示出来，只是用其宽度来比较要显示的文字是否过长
private Layout createWorkingLayout(String workingText) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
return new StaticLayout(workingText, getPaint(), initWidth - getPaddingLeft() - getPaddingRight(),
Layout.Alignment.ALIGN_NORMAL, getLineSpacingMultiplier(), getLineSpacingExtra(), false);
} else{
return new StaticLayout(workingText, getPaint(), initWidth - getPaddingLeft() - getPaddingRight(),
Layout.Alignment.ALIGN_NORMAL, 1.0f, 0.0f, false);
}
}
}
ButtonSpan.class
import android.content.Context;
import android.text.TextPaint;
import android.text.style.ClickableSpan;
import android.view.View;
import com.yimiao100.sale.yimiaomanager.R;
/**
* Created by Michel on 2018/7/24.
*/
public class ButtonSpan extends ClickableSpan {
View.OnClickListener onClickListener;
private Context context;
private int colorId;
public ButtonSpan(Context context, View.OnClickListener onClickListener) {
this(context, onClickListener, R.color.colorAccent);
}
public ButtonSpan(Context context, View.OnClickListener onClickListener, int colorId){
this.onClickListener = onClickListener;
this.context = context;
this.colorId = colorId;
}
public void updateDrawState(TextPaint ds) {
ds.setColor(context.getResources().getColor(colorId));
ds.setUnderlineText(false);
}
public void onClick(View widget) {
if (onClickListener != null) {
onClickListener.onClick(widget);
}
}
}
ScreenUtils class
import android.content.Context;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.WindowManager;
/**
* Created by chenjie on 18-7-26.
*/
public class ScreenUtils {
private ScreenUtils()
{
/* cannot be instantiated */
throw new UnsupportedOperationException("cannot be instantiated");
}
/**
* 获得屏幕宽度
*
* @param context
* @return
*/
public static int getScreenWidth(Context context)
{
WindowManager wm = (WindowManager) context
.getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics outMetrics = new DisplayMetrics();
wm.getDefaultDisplay().getMetrics(outMetrics);
return outMetrics.widthPixels;
}
/**
* dp转px
*
* @param context
* @param dpVal
* @return
*/
public static int dp2px(Context context, float dpVal) {
return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
dpVal, context.getResources().getDisplayMetrics());
}
}
使用
list = new ArrayList<String>();
for (int i = 1; i < 10; i++)
{
list.add("aaaaaaqqqqqqqqqqqqqqqqqqqqqqqqqqqaaaaeeeeeeeeeeeeeeeeeeeeeeeeeaaaa" +
"aaaaaaaqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqaaaaaa，" +
"aaaaaqqqqqqqqqqqqqqqqqqqqaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
"aaaaaaaaaaaaaaaaaaaaaaaaa");
} int whidth = ScreenUtils.getScreenWidth(getActivity()) - ScreenUtils.dp2px(getActivity(),16*2);
holder.text_expand.initWidth(whidth);
holder.text_expand.setMaxLines(3);
holder.text_expand.setCloseText(list.get(position));
