TextView豎直滾動

public class AutoScrollTextView extends TextSwitcher implements
        ViewSwitcher.ViewFactory {

    private static final int FLAG_START_AUTO_SCROLL = 1001;
    private static final int FLAG_STOP_AUTO_SCROLL = 1002;

    /**
     * 輪播時間間隔
     */
    private int scrollDuration = 2000;
    /**
     * 動畫時間
     */
    private int animDuration = 1000;

    /**
     * 文字大小
     */
    private float mTextSize = 14;
    /**
     * 文字Padding
     */
    private int mPadding = 20;
    /**
     * 文字顏色
     */
    private int textColor = Color.BLACK;

    private OnItemClickListener itemClickListener;
    private Context mContext;
    /**
     * 當前顯示Item的ID
     */
    private volatile int currentId = -1;
    private CopyOnWriteArrayList<String> textList;
    private Handler handler;

    public AutoScrollTextView(Context context) {
        this(context, null);
        mContext = context;
    }

    public AutoScrollTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        mContext = context;
        init();
    }

    @SuppressLint("HandlerLeak")
    private void init() {
        textList = new CopyOnWriteArrayList<>();
        handler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                switch (msg.what) {
                    case FLAG_START_AUTO_SCROLL:
                        if (textList.size() > 0) {
                            currentId++;
                            setText(textList.get(currentId % textList.size()));
                        }
                        handler.sendEmptyMessageDelayed(FLAG_START_AUTO_SCROLL, scrollDuration);
                        break;
                    case FLAG_STOP_AUTO_SCROLL:
                        handler.removeMessages(FLAG_START_AUTO_SCROLL);
                        break;
                }
            }
        };

        setFactory(this);
        Animation in = new TranslateAnimation(0, 0, 300, 0);
        in.setDuration(animDuration);
        in.setInterpolator(new AccelerateInterpolator());
        Animation out = new TranslateAnimation(0, 0, 0, -300);
        out.setDuration(animDuration);
        out.setInterpolator(new AccelerateInterpolator());
        setInAnimation(in);
        setOutAnimation(out);
    }

    /**
     * 設置數據源
     *
     * @param titles
     */
    public void setTextList(ArrayList<String> titles) {
        textList.clear();
        textList.addAll(titles);
        currentId = -1;

    }

    public void setText1(String text) {
        if (TextUtils.isEmpty(text)) {
            return;
        }
        stopAutoScroll();
        int width = getWidth() - mPadding * 2;
        TextPaint paint = new TextPaint();
        paint.setTextSize(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, mTextSize, mContext.getResources().getDisplayMetrics()));
        if (width < paint.measureText(" ")) {
            return;
        }
        List<String> lineList = new ArrayList<>();
        StringBuilder newLine = new StringBuilder();
        for (int i = 0; i < text.length(); i++) {
            if ('\n' == text.charAt(i)) {
                lineList.add(newLine.toString());
                newLine.setLength(0);
            } else {
                newLine.append(text.charAt(i));
                if (paint.measureText(newLine.toString()) > width) {
                    lineList.add(newLine.toString().substring(0, newLine.toString().length() - 1));
                    i--;
                    newLine.setLength(0);
                } else {
                    if (i == text.length() - 1) {
                        lineList.add(newLine.toString());
                        newLine.setLength(0);
                        break;
                    }
                }
            }
        }
        textList.clear();
        textList.addAll(lineList);
        currentId = -1;
    }

    /**
     * 開始輪播
     */
    public void startAutoScroll() {
        if (textList.isEmpty()) {
            return;
        }
        if (textList.size() == 1) {
            setText(textList.get(0));
            return;
        }
        handler.removeCallbacksAndMessages(null);
        handler.sendEmptyMessage(FLAG_START_AUTO_SCROLL);
    }

    /**
     * 停止輪播
     */
    public void stopAutoScroll() {
        handler.sendEmptyMessage(FLAG_STOP_AUTO_SCROLL);
    }

    @Override
    public View makeView() {
        TextView t = new TextView(mContext);
        t.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
        t.setMaxLines(1);
        t.setPadding(mPadding, mPadding, mPadding, mPadding);
        t.setTextColor(textColor);
        t.setTextSize(mTextSize);

        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;
    }

    /**
     * 設置點擊事件監聽
     */
    public void setOnItemClickListener(OnItemClickListener itemClickListener) {
        this.itemClickListener = itemClickListener;
    }

    /**
     * 輪播文本點擊監聽器
     */
    public interface OnItemClickListener {

        /**
         * 點擊回調
         *
         * @param position 當前點擊ID
         */
        public void onItemClick(int position);

    }

}

使用 xml：

  <com...widget.AutoScrollTextView
            android:id="@+id/scroll"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center" />

 private AutoScrollTextView remindView;



remindView = findViewById(R.id.scroll);
//點擊監聽
remindView.setOnItemClickListener(new AutoScrollTextView.OnItemClickListener() {
            @Override
            public void onItemClick(int position) {
                
            }
});
remindView.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
            @Override
            public boolean onPreDraw() {
                remindView.getViewTreeObserver().removeOnPreDrawListener(this);
                remindView.setText1("這裏來滾動滾動滾動滾動滾動滾動滾動滾動滾動滾動滾動滾動滾動");
                remindView.startAutoScroll();
                return true;
            }
});