文字轮播

文字的轮播，一种是跑马灯效果，文字字数超过了 TextView 可容纳的最大字数，并且为 TextView 设置了ellipsize=“marquee”，这时就可以实现文字轮播的效果了。另外一种效果是显示文字集合，每条数据上下滚动或是左右滚动。这种效果也是本篇的主要内容。

这是封装后的，里面包含一些设置属性的方法，为了使用更简单方便一些。使用的控件是 TextSwithcer。

/*** Created by miao on 2018/12/6.*/
public class SlideTextView extends TextSwitcher {private int index = 0;//textview上下滚动下标private Handler handler = new Handler();private boolean isFlipping = false; // 是否启用轮播private List<String> textList = new ArrayList<>();private int inAnimId = R.anim.slide_in_bottom;private int outAnimId = R.anim.slide_out_top;private TextUtils.TruncateAt ellipsize = TextUtils.TruncateAt.MIDDLE;private int textSize = 12;private int textColor = Color.BLACK;private int gravity = Gravity.CENTER;private int textPaddingLeft = 25;private int textPaddingTop = 0;private int textPaddingRight = 25;private int textPaddingBottom = 0;private int duration = 3000;private Context mContext;private Runnable runnable = new Runnable() {@Overridepublic void run() {if (!isFlipping) {return;}setText(textList.get(index % textList.size()));if (index == textList.size()) {index = 0;}index++;startFlipping();}};public SlideTextView(Context context) {super(context);mContext = context;
//        setTextSwitcher();}public SlideTextView(Context context, AttributeSet attrs) {super(context, attrs);mContext = context;
//        setTextSwitcher();}//开启轮播public SlideTextView startFlipping() {if (textList.size() == 1) {setText(textList.get(0));index = 0;}if (textList.size() > 1) {handler.removeCallbacks(runnable);isFlipping = true;handler.postDelayed(runnable, duration);}return this;}//关闭轮播public SlideTextView stopFlipping() {if (textList.size() > 1) {isFlipping = false;handler.removeCallbacks(runnable);}return this;}/*** 先设置 text 的各种属性，然后再添加到 textswitcher* @return*/public SlideTextView addTextSwitcher() {setInAnimation(AnimationUtils.loadAnimation(mContext, inAnimId));setOutAnimation(AnimationUtils.loadAnimation(mContext, outAnimId));setFactory(new ViewSwitcher.ViewFactory() {@Overridepublic View makeView() {TextView textView = new TextView(mContext);textView.setTextSize(textSize);//字号textView.setTextColor(textColor);textView.setEllipsize(ellipsize);textView.setSingleLine();textView.setGravity(gravity);FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);textView.setLayoutParams(params);textView.setPadding(textPaddingLeft, textPaddingTop, textPaddingRight, textPaddingBottom);return textView;}});return this;}public List<String> getTextList() {return textList;}public SlideTextView setTextList(List<String> textList) {this.textList = textList;return this;}public int getInAnimId() {return inAnimId;}public SlideTextView setInAnimId(int inAnimId) {this.inAnimId = inAnimId;return this;}public int getOutAnimId() {return outAnimId;}public SlideTextView setOutAnimId(int outAnimId) {this.outAnimId = outAnimId;return this;}public TextUtils.TruncateAt getEllipsize() {return ellipsize;}public SlideTextView setEllipsize(TextUtils.TruncateAt ellipsize) {this.ellipsize = ellipsize;return this;}public int getTextSize() {return textSize;}public SlideTextView setTextSize(int textSize) {this.textSize = textSize;return this;}public int getTextColor() {return textColor;}public SlideTextView setTextColor(int textColor) {this.textColor = textColor;return this;}public int getGravity() {return gravity;}public SlideTextView setGravity(int gravity) {this.gravity = gravity;return this;}public int getTextPaddingLeft() {return textPaddingLeft;}public SlideTextView setTextPaddingLeft(int textPaddingLeft) {this.textPaddingLeft = textPaddingLeft;return this;}public int getTextPaddingTop() {return textPaddingTop;}public SlideTextView setTextPaddingTop(int textPaddingTop) {this.textPaddingTop = textPaddingTop;return this;}public int getTextPaddingRight() {return textPaddingRight;}public SlideTextView setTextPaddingRight(int textPaddingRight) {this.textPaddingRight = textPaddingRight;return this;}public int getTextPaddingBottom() {return textPaddingBottom;}public SlideTextView setTextPaddingBottom(int textPaddingBottom) {this.textPaddingBottom = textPaddingBottom;return this;}public int getDuration() {return duration;}public SlideTextView setDuration(int duration) {this.duration = duration;return this;}
}

拉下来是如何使用：

mSlideTextView.setTextList(mWarningTextList).setTextColor(Color.RED).setTextSize(20).setTextPaddingLeft(30).setTextPaddingRight(30).setTextPaddingTop(30).setTextPaddingBottom(30).setEllipsize(TextUtils.TruncateAt.START).setInAnimId(R.anim.slide_in_right).setOutAnimId(R.anim.slide_out_left)// 上面的这些值也可以不设置，就是默认的// 注意这里的设置顺序，先 add 后 start.addTextSwitcher().startFlipping();}

还需要的就是两个 anim 文件了，很简单就不再这里贴了。需要的话点击这里查看。

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