Custom TextView Marquee

This article mainly introduces the TextView the controllable marquee effect realization.

Android comes with the TextView add a few properties can realize the marquee effect, presumably so

        Android:ellipsize= "marquee"         android:focusable= "true"         android:focusableintouchmode= " True    

A marquee effect is achieved when the TextView gets focus.

This article is to implement a method that does not have the focus and can control the start and end of the marquee.

1, the main use of void Android.view.View.scrollTo (int x, int y) method in the background constantly scroll to achieve text movement effect.

Call Scrollto (currentscrollx,0) in the Run method in runnable to move the text, increase the text position currentscrollx+=2, and then postdelayed (this, 5) Enter the Run method again to call Scrollto (currentscrollx,0).

1 currentscrollx + = 2; 2             ScrollTo (currentscrollx, 0); 3             Postdelayed (this, 5);

Plus get text width stop control and appear from the right of the text box after the following:

1  Public voidrun () {2         if(!ismeasure) {//text width just need to get it once.3 gettextwidth (); 4Ismeasure =true;5         }6LOG.I ("Don't eat breakfast", "Run GetWidth:" + This. GetWidth () + "TextWidth:" +textWidth);7 8         if( This. GetWidth () <textWidth) {9Currentscrollx + = 2;TenScrollTo (CURRENTSCROLLX, 0); One             if(isstop) { ALOG.I ("Don't eat Breakfast", "isstop"); -                 return; -             } the             if(Getscrollx () >=textWidth) { -LOG.I ("Don't eat Breakfast", "scrollTo"); -CURRENTSCROLLX =- This. getwidth (); -ScrollTo (CURRENTSCROLLX, 0); +                 //return; -             } +Postdelayed ( This, 5); A         } at}

where This.getwidth () < textwidth is used to determine whether the text width is greater than the width of the text box. Get Text Width code:

1 Private void gettextwidth () {2          This . Getpaint (); 3          This . GetText (). toString (); 4         TextWidth = (int) paint.measuretext (str); 5     }

Note: Get the text width after measure, so be in the Run method.

Here's how to control the movement:

1 //Start scrolling2      Public voidStartscroll () {3 invalidate ();4LOG.I ("Don't eat Breakfast", "getwidth:" + This. GetWidth () + "TextWidth:" +textWidth);5Isstop =false;6          This. Removecallbacks ( This);7LOG.I ("Don't eat Breakfast", "Startscroll");8Post This);9     }Ten  One     //Stop scrolling A      Public voidStopscroll () { -Isstop =true; -ScrollTo (0, 0); theCURRENTSCROLLX =-2; -     } -  -     //Scroll from the beginning +      Public voidstartFor0 () { -CURRENTSCROLLX =-2; + Startscroll (); A}

Small Demo Link: http://pan.baidu.com/s/1o61F1z0

Custom TextView Marquee