项目需要一个首页轮播组件，所以自己简单写了一个。 主要是项目页面每次在回来时要刷新数据，所以导致整个轮播 又要重新刷新一次，体验非常不好，所以在这儿进行了部分优 化。使其在每次设置新数据时，更加perfect。嘿嘿 直接上代码：
public class VerticalRollTextView extends TextSwitcher implements ViewSwitcher.ViewFactory { private static final int FLAG_START_AUTO_SCROLL = 199; private float mTextSize = 16 ; private int stillTime = 3000; private int textColor = Color.BLACK; private int lines = -1; private boolean isRunning = false; private OnItemClickListener itemClickListener; private Context mContext; private int currentId = -1; private ArrayList<String> textList = new ArrayList<String>(); public VerticalRollTextView(Context context) { this(context, null); mContext = context; } public VerticalRollTextView(Context context, AttributeSet attrs) { super(context, attrs); mContext = context; TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.VerticalRollTextView); textColor = a.getColor(R.styleable.VerticalRollTextView_rollTextColor, Color.BLACK); mTextSize = a.getDimension(R.styleable.VerticalRollTextView_rollTextSize, 16); lines = a.getInteger(R.styleable.VerticalRollTextView_rollLines,-1); textList = new ArrayList<String>(); } public void setAnimTime(long animDuration) { if (getChildCount() != 2) { removeAllViews(); } setFactory(this); Animation in = new TranslateAnimation(0, 0, 100, 0); in.setDuration(animDuration); in.setInterpolator(new AccelerateInterpolator()); Animation out = new TranslateAnimation(0, 0, 0, -100); out.setDuration(animDuration); out.setInterpolator(new AccelerateInterpolator()); setInAnimation(in); setOutAnimation(out); } Runnable runnable = new Runnable() { @Override public void run() { while (isRunning){ handler.sendEmptyMessage(FLAG_START_AUTO_SCROLL); SystemClock.sleep(stillTime); } } }; private Handler handler =new Handler() { @Override public void handleMessage(Message msg) { if (msg.what == FLAG_START_AUTO_SCROLL&&textList != null) { if (textList.size() > 0) { currentId++; setText(textList.get(currentId % textList.size())); } } } }; /** * 设置数据源 * @param titles */ public void setTextList(ArrayList<String> titles) { if (titles == null){ isRunning = false; return; } if (textList.toString().equals(titles.toString())){ return; } textList = titles; if (titles.size() == 1){ currentId = 0; setText(textList.get(currentId % textList.size())); isRunning = false; return; } startAutoScroll(); } /** * 开始滚动 */ public void startAutoScroll() { if (isRunning == false){ isRunning = true; Thread thread = new Thread(runnable); currentId = -1; thread.start(); } } /** * 停止滚动 */ public void stopAutoScroll() { isRunning = false; } @Override public View makeView() { TextView t = new TextView(mContext); t.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT); FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams( FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT); t.setLayoutParams(layoutParams); if (lines != -1) { t.setLines(lines); } t.setTextColor(textColor); t.setTextSize(TypedValue.COMPLEX_UNIT_PX,mTextSize); t.setEllipsize(TextUtils.TruncateAt.END); t.setClickable(true); t.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { if (itemClickListener != null && textList.size() > 0 && currentId != -1) { itemClickListener.onItemClick(currentId % textList.size()); } } }); return t; } /** * @param textSize 字号 * @param textColor 字体颜色 */ public void setText(float textSize,int textColor) { mTextSize = textSize; this.textColor = textColor; } public void setStillTime(int stillTime){ this.stillTime = stillTime; } /** * 设置点击事件监听 * @param itemClickListener */ public void setOnItemClickListener(OnItemClickListener itemClickListener) { this.itemClickListener = itemClickListener; } /** * 轮播文本点击监听器 */ public interface OnItemClickListener { /** * 点击回调 * @param position 当前点击ID */ void onItemClick(int position); } } <!--公告轮播器--> <declare-styleable name="VerticalRollTextView"> <attr name="rollTextColor" format="color"/> <attr name="rollTextSize" format="dimension"/> <attr name="rollPadding" format="dimension"/> <attr name="rollLines" format="integer"/> </declare-styleable>