How to Write a textview that can be expanded

The principle is to set it when you clickSetmaxlines (linenum)To achieve:

Public class expandabletextview extends textview {Private Static int min_line_num = 2; Private Static int max_line_num = 20; private int linenum = min_line_num; private Boolean misexpanded = false; bitmap bitmapdown; bitmap bitmapup; int W, H;/** Click Event listener */private onclicklistener monclicklistener; Public expandabletextview (context, attributeset attrs) {super (context, attrs); Init (C Ontext, attrs);} private void Init (context, attributeset attrs) {setmaxlines (linenum); bitmapdown = bitmapfactory. decoderesource (getresources (), R. drawable. update_detail_down); bitmapup = bitmapfactory. decoderesource (getresources (), R. drawable. update_detail_up); W = bitmapdown. getwidth () + (INT) context. getresources (). getdimension (R. dimen. expand_textview_right); H = bitmapdown. getheight () + (INT) context. getresources (). getdimension (R. dimen. expand_textview_bottom); super. setonclicklistener (New onclicklistener () {@ override public void onclick (view v) {If (linenum = min_line_num) {linenum = max_line_num; setmaxlines (linenum );} else {linenum = min_line_num; setmaxlines (linenum);} If (monclicklistener! = NULL) {monclicklistener. onclick (v) ;}}) ;}@ override public void setonclicklistener (onclicklistener listener) {If (! Isclickable () {setclickable (true);} monclicklistener = listener;} @ override public void setmaxlines (INT maxlines) {super. setmaxlines (maxlines); If (linenum = max_line_num) {misexpanded = true;} else {misexpanded = false;} public Boolean isexpanded () {return misexpanded ;} @ override protected void ondraw (canvas) {If (getlinecount () <= min_line_num) {super. ondraw (canvas); return;} If (linenum = min_line_num) {canvas. drawbitmap (bitmapdown, getwidth ()-W, getheight ()-H, null);} else {canvas. drawbitmap (bitmapup, getwidth ()-W, getheight ()-H, null);} super. ondraw (canvas);} public void setmaxline (INT line) {linenum = line; setmaxlines (line );}}

Write layout as follows:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="#FFFFFF" >    <TextView        android:id="@+id/detail_action"        android:textColor="#000000"        android:textSize="11sp"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentTop="true"        android:layout_marginRight="8dip"        android:drawablePadding="4dip"        android:paddingBottom="10dip"        android:paddingTop="10dip"        android:singleLine="true"        android:text="sdfkljsfiosjdfiosfjsiofjsdifsd" />    <com.example.view.ExpandableTextView        android:id="@+id/textview"        android:layout_width="100dp"        android:layout_height="wrap_content"        android:layout_below="@id/detail_action"        android:lineSpacingExtra="4dip"        android:paddingBottom="-40dip"        android:paddingRight="48dip"        android:text="adfsfsfewrwerwerwerqRWgdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfdfERSAFSDFSDFSDd"        android:layout_marginTop="-5dip"        android:textColor="#000000" >    </com.example.view.ExpandableTextView>             <TextView        android:id="@+id/detail_action1"        android:textColor="#000000"        android:textSize="11sp"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_below="@id/textview"        android:layout_marginRight="8dip"        android:drawablePadding="4dip"        android:paddingBottom="10dip"        android:paddingTop="10dip"        android:singleLine="true"        android:text="sdfkljsfiosjdfiosfjsiofjsdifsd" /></RelativeLayout>

How to Write a textview that can be expanded