垂直滚动公告栏

import android.content.Context;
import android.graphics.Color;
import android.os.Handler;
import android.os.Message;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;
import android.widget.TextSwitcher;
import android.widget.TextView;
import android.widget.ViewSwitcher;

public class VerticalTextView extends TextSwitcher implements ViewSwitcher.ViewFactory {

    private static final int FLAG_START_AUTO_SCROLL = 0;
    private static final int FLAG_STOP_AUTO_SCROLL = 1;

    private float mTextSize = 16;
    private int mPadding = 5;
    private int textColor = Color.BLACK;

    /**
     * @param textSize  字号
     * @param padding   内边距
     * @param textColor 字体颜色
     */
    public void setText(float textSize, int padding, int textColor) {
        mTextSize = textSize;
        mPadding = padding;
        this.textColor = textColor;
    }

    private OnItemClickListener itemClickListener;
    private Context mContext;
    private int currentId = -1;
    private ArrayList textList;
    private Handler handler;
    private boolean isBegin = false;

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

    public VerticalTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        mContext = context;
        textList = new ArrayList();
    }

    public void setAnimTime(long animDuration) {
        setFactory(this);
        Animation in = new TranslateAnimation(0, 0, 70, 0);
        in.setDuration(animDuration);
        in.setInterpolator(new AccelerateInterpolator());
        Animation out = new TranslateAnimation(0, 0, 0, -70);
        out.setDuration(animDuration);
        out.setInterpolator(new AccelerateInterpolator());
        setInAnimation(in);
        setOutAnimation(out);
    }

    /**
     * 间隔时间
     */
    public void setTextStillTime(final long time) {
        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, time);
                        break;
                    case FLAG_STOP_AUTO_SCROLL:
                        handler.removeMessages(FLAG_START_AUTO_SCROLL);
                        break;
                }
            }
        };
    }

    /**
     * 设置数据源
     *
     * @param titles
     */
    public void setTextList(ArrayList titles) {
        textList.clear();
        textList.addAll(titles);
        currentId = -1;
    }

//开始滚动

public void startAutoScroll() { if ( isBegin) { return; } isBegin = true; handler.sendEmptyMessage( FLAG_START_AUTO_SCROLL); }

//停止滚动

public void stopAutoScroll() { if (! isBegin){ return; } isBegin = false; 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, 0, mPadding, 0); t.setTextColor( textColor); t.setEllipsize(TextUtils.TruncateAt. END); t.setTextSize(TypedValue. COMPLEX_UNIT_SP, 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; } //点击事件监听 public void setOnItemClickListener(OnItemClickListener itemClickListener) { this. itemClickListener = itemClickListener; } // 轮播文本点击监听器,需要实现它 public interface OnItemClickListener { // 点击回调 void onItemClick( int position); }}