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Android实现文字滚动效果

2019年07月24日  | 移动技术网移动技术  | 我要评论

android 实现文字滚动效果，自己写了个timer小计时器，textview文字上下翻动效果：

public class autotextview extends textswitcher implements
  viewswitcher.viewfactory {

 private float mheight;
 private context mcontext;
 //minup,moutup分别构成向下翻页的进出动画
 private rotate3danimation minup;
 private rotate3danimation moutup;
 
 //mindown,moutdown分别构成向下翻页的进出动画
 private rotate3danimation mindown;
 private rotate3danimation moutdown;
 
 public autotextview(context context) {
  this(context, null);
  // todo auto-generated constructor stub
 }

 public autotextview(context context, attributeset attrs) {
  super(context, attrs);
  // todo auto-generated constructor stub
  typedarray a = context.obtainstyledattributes(attrs, r.styleable.auto3d);
  mheight = a.getdimension(r.styleable.auto3d_textsize, 16);
  a.recycle();
  mcontext = context;
  init();
 }

 private void init() {
  // todo auto-generated method stub
  setfactory(this);
  minup = createanim(-90, 0 , true, true);
  moutup = createanim(0, 90, false, true);
  mindown = createanim(90, 0 , true , false);
  moutdown = createanim(0, -90, false, false);
  //textswitcher主要用于文件切换，比如 从文字a 切换到 文字 b，
  //setinanimation()后，a将执行inanimation，
  //setoutanimation()后，b将执行outanimation
  setinanimation(minup);
  setoutanimation(moutup);
 }
 
 private rotate3danimation createanim(float start, float end, boolean turnin, boolean turnup){
  final rotate3danimation rotation = new rotate3danimation(start, end, turnin, turnup);
  rotation.setduration(800);
  rotation.setfillafter(false);
  rotation.setinterpolator(new accelerateinterpolator());
  return rotation;
 }

 //这里返回的textview，就是我们看到的view
 @override
 public view makeview() {
  // todo auto-generated method stub
  textview t = new textview(mcontext);
  t.setgravity(gravity.center);
  t.settextsize(16);
  t.setmaxlines(1);
  t.settextcolor(mcontext.getresources().getcolor(r.color.textcolor));
  return t;
 }
 //定义动作，向下滚动翻页
 public void previous(){
  if(getinanimation() != mindown){
   setinanimation(mindown);
  }
  if(getoutanimation() != moutdown){
   setoutanimation(moutdown);
  }
 }
 //定义动作，向上滚动翻页
 public void next(){
  if(getinanimation() != minup){
   setinanimation(minup);
  }
  if(getoutanimation() != moutup){
   setoutanimation(moutup);
  }
 }
 
 class rotate3danimation extends animation {
   private final float mfromdegrees;
   private final float mtodegrees;
   private float mcenterx;
   private float mcentery;
   private final boolean mturnin;
   private final boolean mturnup;
   private camera mcamera;

   public rotate3danimation(float fromdegrees, float todegrees, boolean turnin, boolean turnup) {
    mfromdegrees = fromdegrees;
    mtodegrees = todegrees;
    mturnin = turnin;
    mturnup = turnup;
   }

   @override
   public void initialize(int width, int height, int parentwidth, int parentheight) {
    super.initialize(width, height, parentwidth, parentheight);
    mcamera = new camera();
    mcentery = getheight() / 2;
    mcenterx = getwidth() / 2;
   }
   
   @override
   protected void applytransformation(float interpolatedtime, transformation t) {
    final float fromdegrees = mfromdegrees;
    float degrees = fromdegrees + ((mtodegrees - fromdegrees) * interpolatedtime);

    final float centerx = mcenterx ;
    final float centery = mcentery ;
    final camera camera = mcamera;
    final int derection = mturnup ? 1: -1;

    final matrix matrix = t.getmatrix();

    camera.save();
    if (mturnin) {
     camera.translate(0.0f, derection *mcentery * (interpolatedtime - 1.0f), 0.0f);
    } else {
     camera.translate(0.0f, derection *mcentery * (interpolatedtime), 0.0f);
    }
    camera.rotatex(degrees);
    camera.getmatrix(matrix);
    camera.restore();

    matrix.pretranslate(-centerx, -centery);
    matrix.posttranslate(centerx, centery);
   }
 }

demo下载链接：

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