自动轮播文字控件

Android 自动轮播文字控件

1.在布局中使用:

<com.project.aladdinslamp.view.LooperTextView
    android:id="@+id/tip_view"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_vertical"
    android:layout_marginLeft="@dimen/dp_8"
    android:gravity="center"
    android:singleLine="true" />

2.控件代码:

public class LooperTextView extends FrameLayout {
    private List<String> tipList;
    private int curTipIndex = 0;
    private long lastTimeMillis;
    private static final int ANIM_DELAYED_MILLIONS = 3 * 1000;
    /**
     * 动画持续时长
     */
    private static final int ANIM_DURATION = 1 * 1000;
    private static final String DEFAULT_TEXT_COLOR = "#2F4F4F";
    private static final int DEFAULT_TEXT_SIZE = 14;
    private Drawable head_boy, head_girl;
    private TextView tv_tip_out, tv_tip_in;
    private static final String TIP_PREFIX = "";
    private Animation anim_out, anim_in;

    public LooperTextView(Context context) {
        super(context);
        initTipFrame();
        initAnimation();
    }

    public LooperTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        initTipFrame();
        initAnimation();
    }

    public LooperTextView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initTipFrame();
        initAnimation();
    }

    private void initTipFrame() {
        //head_boy = loadDrawable(R.mipmap.ic_new);
        //head_girl = loadDrawable(R.mipmap.psw_new);
        tv_tip_out = newTextView();
        tv_tip_in = newTextView();
        tv_tip_in.setEllipsize(TextUtils.TruncateAt.END);
        tv_tip_out.setEllipsize(TextUtils.TruncateAt.END);
        tv_tip_in.setMaxLines(1);
        tv_tip_out.setMaxLines(1);
        addView(tv_tip_in);
        addView(tv_tip_out);
    }

    private TextView newTextView() {
        TextView textView = new TextView(getContext());
        LayoutParams lp = new LayoutParams(
                LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT, Gravity.CENTER_VERTICAL);
        textView.setLayoutParams(lp);
        textView.setCompoundDrawablePadding(10);
        textView.setGravity(Gravity.CENTER_VERTICAL);
        textView.setLines(2);
        textView.setEllipsize(TextUtils.TruncateAt.END);
        textView.setTextColor(Color.parseColor(DEFAULT_TEXT_COLOR));
        textView.setTextSize(TypedValue.COMPLEX_UNIT_DIP, DEFAULT_TEXT_SIZE);
        return textView;
    }

    /**
     * 将资源图片转换为Drawable对象
     *
     * @param ResId
     * @return
     */
    private Drawable loadDrawable(int ResId) {
        Drawable drawable = getResources().getDrawable(ResId);
        drawable.setBounds(0, 0, drawable.getMinimumWidth() - 10, drawable.getMinimumHeight() - 10);
        return drawable;
    }

    private void initAnimation() {
        anim_out = newAnimation(0, -1);
        anim_in = newAnimation(1, 0);
        anim_in.setAnimationListener(new Animation.AnimationListener() {

            @Override
            public void onAnimationStart(Animation animation) {

            }

            @Override
            public void onAnimationRepeat(Animation animation) {

            }

            @Override
            public void onAnimationEnd(Animation animation) {
                updateTipAndPlayAnimationWithCheck();
            }
        });
    }

    private Animation newAnimation(float fromYValue, float toYValue) {
        Animation anim = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0, Animation.RELATIVE_TO_SELF, 0,
                Animation.RELATIVE_TO_SELF, fromYValue, Animation.RELATIVE_TO_SELF, toYValue);
        anim.setDuration(ANIM_DURATION);
        anim.setStartOffset(ANIM_DELAYED_MILLIONS);
        anim.setInterpolator(new DecelerateInterpolator());
        return anim;
    }

    private void updateTipAndPlayAnimationWithCheck() {
        if (System.currentTimeMillis() - lastTimeMillis < 1000) {
            return;
        }
        lastTimeMillis = System.currentTimeMillis();
        updateTipAndPlayAnimation();
    }

    private void updateTipAndPlayAnimation() {
        if (curTipIndex % 2 == 0) {
            updateTip(tv_tip_out);
            tv_tip_in.startAnimation(anim_out);
            tv_tip_out.startAnimation(anim_in);
            this.bringChildToFront(tv_tip_in);
        } else {
            updateTip(tv_tip_in);
            tv_tip_out.startAnimation(anim_out);
            tv_tip_in.startAnimation(anim_in);
            this.bringChildToFront(tv_tip_out);
        }
    }

    private void updateTip(TextView tipView) {
        if (new Random().nextBoolean()) {
            tipView.setCompoundDrawables(head_boy, null, null, null);
        } else {
            tipView.setCompoundDrawables(head_girl, null, null, null);
        }
        String tip = getNextTip();
        if (!TextUtils.isEmpty(tip)) {
            tipView.setText(tip + TIP_PREFIX);
        }
    }

    /**
     * 获取下一条消息
     *
     * @return
     */
    private String getNextTip() {
        if (isListEmpty(tipList)) return null;
        return tipList.get(curTipIndex++ % tipList.size());
    }

    public static boolean isListEmpty(List list) {
        return list == null || list.isEmpty();
    }

    public void setTipList(List<String> tipList) {
        this.tipList = tipList;
        curTipIndex = 0;
        updateTip(tv_tip_out);
        updateTipAndPlayAnimation();
    }
}

3.JAVA的使用:

private void setLottery(List<HomePageBeans.AwartBean> lottery) {
    //模拟抽奖数据
    List<String> strs = new ArrayList<>();
    for (int i = 0; i < lottery.size(); i++) {
        HomePageBeans.AwartBean awartBean = lottery.get(i);
        String str = "恭喜:" + awartBean.getMobile() + "抽中" + awartBean.getBonus_money() + "元红包";
        strs.add(str);
    }
    tipView.setTipList(strs);

}