安卓滚动字幕以及TextSwitcher、ImageSwitcher使用

项目源码下载：https://github.com/libin7278/TextSwitcher
#TextSwitcher使用方法
##四部曲
###1:布局并初始化

###2:设置工厂模式

 ts.setFactory(this);
 implements ViewSwitcher.ViewFactory
 实现makeView()方法

 @Override
 public View makeView() {
 TextView textView = new TextView(this);
 textView.setTextSize(36);
 return textView;
 }

###3.使用
每调一setText()方法会实现自动切换,比如倒计时之类的效果不错

###4.酷炫切换效果

setInAnimation()
setOutAnimation()

#ImageSwitcher使用方法
##四部曲
###1:布局并初始化

###2:设置工厂模式

public class Switch3Activity extends Activity implements ViewSwitcher.ViewFactory {

ImageSwitcher.setFactory(this);

}

@Override
    public View makeView() {
        ImageView imageView = new ImageView(this);
        return imageView;
    }

###3.使用setImageResource
每调一次setImageResource就会更改图片

ImageSwitcher.setImageResource(images[number%images.length]);

###4.酷炫切换效果

setInAnimation()
setOutAnimation()

#竖直字幕滚动效果

/**
 * 自动垂直滚动的TextView
 */
public class AutoVerticalScrollTextView extends TextSwitcher implements ViewSwitcher.ViewFactory {

    private Context mContext;

    //mInUp,mOutUp分别构成向下翻页的进出动画
    private Rotate3dAnimation mInUp;
    private Rotate3dAnimation mOutUp;

    public AutoVerticalScrollTextView(Context context) {
        this(context, null);
    }

    public AutoVerticalScrollTextView(Context context, AttributeSet attrs) {
        super(context, attrs);

        mContext = context;
        init();

    }

    private void init() {

        setFactory(this);
        setInAnimation(showTextAnimation());//当View显示时动画资源ID
        setOutAnimation(dismessTextAnimation());//当View隐藏是动画资源ID。

    }

    private Rotate3dAnimation createAnim( boolean turnIn, boolean turnUp){

        Rotate3dAnimation rotation = new Rotate3dAnimation(turnIn, turnUp);
        rotation.setDuration(1200);//执行动画的时间
        rotation.setFillAfter(false);//是否保持动画完毕之后的状态
        rotation.setInterpolator(new AccelerateInterpolator());//设置加速模式

        return rotation;
    }


    //这里返回的TextView，就是我们看到的View,可以设置自己想要的效果
    public View makeView() {

        TextView textView = new TextView(mContext);
        textView.setGravity(Gravity.LEFT);
        textView.setTextSize(20);
        textView.setGravity(Gravity.CENTER);
        textView.setTextColor(Color.WHITE);
        textView.setLineSpacing(20,1);

        return textView;

    }

    //定义动作，向上滚动翻页
    public void next(){
        //显示动画
        if(getInAnimation() != mInUp){
            setInAnimation(showTextAnimation());
        }
        //隐藏动画
        if(getOutAnimation() != mOutUp){
            setOutAnimation(dismessTextAnimation());
        }
    }

    class Rotate3dAnimation extends Animation {
        private float mCenterX;
        private float mCenterY;
        private final boolean mTurnIn;
        private final boolean mTurnUp;
        private Camera mCamera;

        public Rotate3dAnimation(boolean turnIn, boolean turnUp) {
            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() ;
            mCenterX = getWidth() ;
        }

        @Override
        protected void applyTransformation(float interpolatedTime, Transformation t) {

            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.getMatrix(matrix);
            camera.restore();

            matrix.preTranslate(-centerX, -centerY);
            matrix.postTranslate(centerX, centerY);
        }
    }

    public AnimationSet showTextAnimation(){
        mInUp = createAnim(true, true);
        AnimationSet animationSet = new AnimationSet(true);
        AlphaAnimation alphaAnimation = new AlphaAnimation(0,1);
        animationSet.addAnimation(alphaAnimation);
        animationSet.addAnimation(mInUp);
        animationSet.setDuration(1000);

        return animationSet;
    }

    public AnimationSet dismessTextAnimation(){
        mOutUp = createAnim(false, true);
        AnimationSet animationSet = new AnimationSet(true);
        AlphaAnimation alphaAnimation = new AlphaAnimation(1,0);
        animationSet.addAnimation(alphaAnimation);
        animationSet.addAnimation(mOutUp);
        animationSet.setDuration(1000);

        return animationSet;
    }
}

如想要了解更多项目详细代码可以访问github：
https://github.com/libin7278/TextSwitcher

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