Android textview text scaling effect with arrows

Android textview text scaling effect with arrows

Although I did it myself or didn't quite understand it, I just read the online method and summarized it myself. If you have a good demo, please share it.

The main method is to restrict the xml file by using several variables without Pasting a common TextView.

 

Public class TextViewActivity extends Activity {private TextView TV; private String status = "up"; private String str = "Android is a Linux-based free and open-source operating system, mainly used for mobile devices, such as smartphones and tablets, led and developed by Google and the Open Mobile Alliance. "; Private String str_show =" "; private int maxlength = 50; @ Overrideprotected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); TV = (TextView) findViewById (R. id. textView1); if (str. length () <maxlength) {TV. setText (str) ;}else {changStatus () ;}} private void changStatus () {TV. setText (""); Drawable drawable = null; if (status. equals ("down") {drawable = getResources (). getDrawable (R. drawable. icon_arrow_up); status = "up"; str_show = str; TV. setMaxLines (10000);} else if (status. equals ("up") {drawable = getResources (). getDrawable (R. drawable. icon_arrow_down); status = "down"; TV. setMaxLines (2); str_show = str. substring (0, maxlength); str_show + = "... ";}string spanString = str_show; spanString = spanString. substring (0, spanString. length (); drawable. setBounds (0, 0, drawable. getIntrinsicWidth (), drawable. getIntrinsicHeight (); SpannableString spannable = new SpannableString (spanString. toString () + "s"); ImageSpan span = new ImageSpan (drawable, ImageSpan. ALIGN_BASELINE); spannable. setSpan (span, spanString. toString (). length (), spanString. toString (). length () + "s ". length (), Spannable. SPAN_INCLUSIVE_EXCLUSIVE); ClickableSpan rightClickableSpan = new ClickableSpan () {@ Overridepublic void onClick (View view) {changStatus () ;}; spannable. setSpan (rightClickableSpan, spanString. toString (). length (), spanString. toString (). length () + "s ". length (), Spannable. SPAN_INCLUSIVE_EXCLUSIVE); TV. setText (spannable); TV. setMovementMethod (new MyTouch ());}}