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：http://xiazai.jb51.net/201611/yuanma/AndroidTextView(jb51.net).rar
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