Android显示全文折叠控件使用方法详解

一般列表里文字太多的一个折叠效果的空间，效果图如下。

当文字超过设定的行数后就折叠，小于设定行数不显示展开按钮。下面上代码。

先看布局文件：

<?xml version="1.0" encoding="utf-8"?>
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:background="@color/color_white" >
 <textview
 android:id="@+id/desc_tv"
 style="@style/font2"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:gravity="center_vertical" />
 <textview
 android:id="@+id/desc_op_tv"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_below="@+id/desc_tv"
 android:gravity="center_vertical"
 android:singleline="true"
 android:text="@string/quan_wen"
 android:textcolor="#5f897b"
 android:textsize="16sp"
 android:visibility="gone" />
</relativelayout>

很简单，上面的textview显示主要的文本内容，下面的就是折叠的时候点击的。

下面是自定义。

package xxx;
import android.annotation.suppresslint;
import android.content.context;
import android.os.handler;
import android.os.message;
import android.util.attributeset;
import android.view.view;
import android.widget.linearlayout;
import android.widget.textview;
import android.widget.textview.buffertype;
import xxx.r;
/**
 * 查看全文控件
 */
public class collapsibletextview extends linearlayout implements view.onclicklistener {
 private static final int collapsible_state_none = 0;// 不显示
 private static final int collapsible_state_shrinkup = 1;// 显示收起
 private static final int collapsible_state_spread = 2;// 显示全文
 private int mstate = collapsible_state_spread;
 private static final string collapsible_state_shrinkup_text = "收起";
 private static final string collapsible_state_spread_text = "全文";
 private textview mtext;
 /**
 * @return returns the mtext.
 */
 public textview getmtext() {
 return mtext;
 }
 public int getmstate() {
 return mstate;
 }
 public void setmstate(int mstate) {
 this.mstate = mstate;
 }
 private textview mtexttip;
 private changestate changestatecallback;
 private boolean isneedlayout;
 private int maxlinecount = 8;
 private final handler handler = new handler() {
 @override
 public void dispatchmessage(message msg) {
  if (mtext.getlinecount() <= maxlinecount) {
  // 行数不足不做处理
  mstate = collapsible_state_none;
  mtext.setmaxlines(integer.max_value);
  mtexttip.setvisibility(view.gone);
  }
  else {
  switch (mstate) {
  case collapsible_state_spread:
   // 全文状态
   mtext.setmaxlines(maxlinecount);
   mtexttip.setvisibility(view.visible);
   mtexttip.settext(collapsible_state_spread_text);
   break;
  case collapsible_state_shrinkup:
   // 收起状态
   mtext.setmaxlines(integer.max_value);
   mtexttip.setvisibility(view.visible);
   mtexttip.settext(collapsible_state_shrinkup_text);
   break;
  default:
   // 除非发生不可知状态，一般不会执行到这个
   mstate = collapsible_state_none;
   mtext.setmaxlines(integer.max_value);
   mtexttip.setvisibility(view.gone);
   break;
  }
  }
 }
 };
 public collapsibletextview(context context) {
 this(context, null);
 initview();
 }
 public collapsibletextview(context context, attributeset attrs) {
 super(context, attrs);
 initview();
 }
 @suppresslint("newapi")
 public collapsibletextview(context context, attributeset attrs, int defstyle) {
 super(context, attrs, defstyle);
 initview();
 }
 private void initview() {
 view view = inflate(getcontext(), r.layout.collapsible_textview, this);
 view.setpadding(0, -1, 0, 0);
 mtext = (textview) view.findviewbyid(r.id.desc_tv);
 mtexttip = (textview) view.findviewbyid(r.id.desc_op_tv);
 mtexttip.setonclicklistener(this);
 }
 /**
 * 设置文本
 * 
 * @param charsequence
 * @param buffertype
 */
 public final void settext(charsequence charsequence, buffertype buffertype) {
 isneedlayout = true;
 mstate = collapsible_state_spread;
 mtext.settext(charsequence, buffertype);
 }
 /**
 * 设置文本
 * 
 * @param charsequence
 */
 public final void settext(charsequence charsequence) {
 isneedlayout = true;
 mtext.settext(charsequence);
 }
 @override
 public void onclick(view v) {
 isneedlayout = true;
 if (mstate == collapsible_state_spread) {
  // 如果是全文状态，就改成收起状态
  mstate = collapsible_state_shrinkup;
  requestlayout();
 }
 else if (mstate == collapsible_state_shrinkup) {
  // 如果是收起状态，就改成全文状态
  mstate = collapsible_state_spread;
  requestlayout();
 }
 if (null != changestatecallback) {
  changestatecallback.changeflag(v);
 }
 }
 @override
 protected void onlayout(boolean changed, int l, int t, int r, int b) {
 super.onlayout(changed, l, t, r, b);
 if (isneedlayout) {
  isneedlayout = false;
  handler.sendmessage(message.obtain());
 }
 }
 public int getmaxlinecount() {
 return maxlinecount;
 }
 public void setmaxlinecount(int maxlinecount) {
 this.maxlinecount = maxlinecount;
 }
 public changestate getchangestatecallback() {
 return changestatecallback;
 }
 public void setchangestatecallback(changestate changestatecallback) {
 this.changestatecallback = changestatecallback;
 }
 public interface changestate {
 public void changeflag(view v);
 }
}

点击展开后重新绘制根据状态值触发。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。