Android 文本向上循环滚动，类似于广告条，已封装好

package fan.textscrollanimdemo; import android.content.Context; import android.graphics.Camera; import android.graphics.Color; import android.graphics.Matrix; import android.os.Handler; import android.os.Message; import android.text.TextUtils; import android.util.AttributeSet; import android.view.Gravity; import android.view.View; import android.view.animation.AccelerateInterpolator; import android.view.animation.Animation; import android.view.animation.Transformation; import android.widget.TextSwitcher; import android.widget.TextView; import android.widget.ViewSwitcher; /** * 滚动的TextView */ public class ScrollTextView 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; private boolean toRun; private static int RUN = 9527; /** * 滚动间隔 */ private int mScrollInterval = 3000; /** * 轮播文字数组 */ private String[] mItems; /** * 当前显示的位置 */ private int mPosition; public ScrollTextView(Context context) { this(context, null); } public ScrollTextView(Context context, AttributeSet attrs) { super(context, attrs); mContext = context; init(); } private void init() { setFactory(this); mInUp = createAnim(true, true); mOutUp = createAnim(false, true); setInAnimation(mInUp);//当View显示时动画资源ID setOutAnimation(mOutUp);//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(300);//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.setSingleLine(true); textView.setGravity(Gravity.CENTER_VERTICAL); textView.setEllipsize(TextUtils.TruncateAt.END); textView.setTextColor(Color.BLACK); return textView; } /** * 设置轮播文字数组 */ public void setItems(String[] mItems){ if(mItems == null){ throw new IllegalArgumentException("轮播文字数组不能为null！"); } this.mItems = mItems; mPosition = 0; if(mItems.length > 0){ setText(mItems[mPosition]); }else{ throw new IllegalArgumentException("轮播文字数组没有内容！"); } } /** * 开始滚动 */ public void startScroll(){ checkArray(); toRun = true; handler.sendEmptyMessageDelayed(RUN,mScrollInterval); } /** * 开始滚动 * @param mScrollInterval 再次滚动间隔，默认3000ms */ public void startScroll(int mScrollInterval){ checkArray(); this.mScrollInterval = mScrollInterval; toRun = true; handler.sendEmptyMessageDelayed(RUN,mScrollInterval); } /** * 设置再次滚动间隔 * @param mScrollInterval 滚动持续时间，默认300ms */ public void setScrollInterval(int mScrollInterval){ this.mScrollInterval = mScrollInterval; } /** * 获取当前位置 * @return */ public int getCurrentPosition(){ return mPosition; } /** * 停止滚动 */ public void stopScroll(){ toRun = false; } private Handler handler = new Handler() { public void handleMessage(Message msg) { if (msg.what == RUN) { if(toRun){ mPosition++; if(mPosition == mItems.length){ mPosition = 0; } setText(mItems[mPosition]); handler.sendEmptyMessageDelayed(RUN,mScrollInterval); } } } }; /** * 校验数组是否为空 */ private void checkArray(){ if(mItems == null){ throw new IllegalArgumentException("没有设置轮播文字数组或轮播文字数组不能为null！"); } if(mItems.length < 1){ throw new IllegalArgumentException("轮播文字数组没有内容！"); } } 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); } } }