How to Write a TextView that can be expanded and expand TextView

How to Write a TextView that can be expanded and expand TextView

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 context, AttributeSet attrs) {super (context, attrs); init (c Ontext, attrs);} private void init (Context 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 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>

:

Code: http://download.csdn.net/detail/baidu_nod/7812741

I want to put a textview on addroid eclipse, but I can only find the autoComplete textview. Why?

Textview mytextview = null; // declare a Textview
Mytextview = (Textview) findViewById (R. id. myTextView); // point mytextview to a Textview control named myTextView in xml
MyTextView. append ("12345"); // the intention of this sentence should be to add the "12345" string to Textview, but you should use mytextview here. append ("12345"); instead of myTextView.
// Understand? Java is case sensitive. In this code, you have assigned the Textview named myTextView in xml to mytextview. Maybe this is the cause of your error.
The meaning of the code above should be put in an activity, which is what you call mainActivity. java.
Hope to adopt it!

How to refresh a textView on the activity

After receiving a broadcast, refresh the textview. After setText, the content is not displayed. Press the button on the activity to display it! ------ Solution handler ------ solution ---------------------------------------------------------- after receiving the broadcast, sendmessage and handler will receive and process the update. ------ solution: debug your debugging, check whether your setText has been executed. ------ solution -------------------------------------------------------- of course, Handler, post, and AsyncTask are supported.