Android消息公告上下滚动切换轮播实现

自定义控件

通过继承TextSwitcher实现

直接上代码

public class NoticesSwitcher extends TextSwitcher implements ViewSwitcher.ViewFactory {

    private Context mContext;
    private List<Notice> mData;
    private final long DEFAULT_TIME_SWITCH_INTERVAL = 1000;//1s
    private long mTimeInterval = DEFAULT_TIME_SWITCH_INTERVAL;
    private int mCurrentIndex = 0;
    private Notice curNotice;

    public NoticesSwitcher(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.mContext = context;
        setFactory(this);
    }

    public NoticesSwitcher setInAnimation(int animationResId){
        Animation animation = AnimationUtils.loadAnimation(this.mContext, animationResId);
        setInAnimation(animation);
        return this;
    }

    public NoticesSwitcher setOutAnimation(int animationResId){
        Animation animation = AnimationUtils.loadAnimation(this.mContext, animationResId);
        setOutAnimation(animation);
        return this;
    }

    /**
     * 通知/公告数据绑定
     * @param data
     * @return
     */
    public NoticesSwitcher bindData(List<Notice> data) {
        this.mData = data;
        return this;
    }

    public void startSwitch(long timeInterval){
        this.mTimeInterval = timeInterval;
        mSwitchHandler.removeMessages(0);
        if (mData != null && mData.size() > 0) {
            mSwitchHandler.sendEmptyMessage(0);
        }else{
            throw new RuntimeException("data is empty");
        }
    }

    /**
     * 工厂类中创建TextView供给TextSwitcher使用
     * @return
     */
    @Override
    public View makeView() {
        LayoutInflater inflater = LayoutInflater.from(mContext);
        TextView view = (TextView) inflater.inflate(R.layout.item_notice_switcher, null);
        view.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                if (curNotice != null) {
                    // 跳转详情
                }
            }
        });
        return view;
    }

    private Handler mSwitchHandler = new Handler(){
        @Override
        public void dispatchMessage(Message msg) {
            super.dispatchMessage(msg);
            int index = mCurrentIndex % mData.size();
            curNotice = mData.get(index);
            setText(mData.get(index).title);

            mCurrentIndex++;
            if (mData.size() > 1) {
                sendEmptyMessageDelayed(0, mTimeInterval);
            }
        }
    };

}

public class Notice {
    public String title;
    public Notice() {}
    public Notice(String title) {
        this.title = title;
    }
}

使用

<com.anyixing.etc.staff.view.NoticesSwitcher
    android:id="@+id/notices_switcher"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"/>

List<Notice> result = new ArrayList<>();
result.add(new Notice("两部门向灾区预拨2亿元救灾资金"));
result.add(new Notice("特朗普被裁定不具备总统参选资格"));
result.add(new Notice("泰国瑞幸向中国瑞幸索赔20亿元"));
binding.layoutNotices.setVisibility(View.VISIBLE);
binding.noticesSwitcher
        .setInAnimation(R.anim.anim_notice_in)
        .setOutAnimation(R.anim.anim_notice_out)
        .bindData(result)
        .startSwitch(2500);

完了，就这么简单