Android怎么实现垂直跑马灯效果-创新互联
这篇文章主要介绍Android怎么实现垂直跑马灯效果，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
在我们开发过程中，跑马灯这个功能非常实用的，在实现这个功能的时候，这个时候我们通常需要找demo来实现这个方法，我从github上面找到这个demo感觉很好用，所以就要实现了这个功能喽MarqueeView，看这个工具类，因为我找这个类的时候是没有点击事件的，所以我给它加了一个点击事件，看这个工具类
public class MarqueeView extends ViewFlipper {
private Context mContext;
private List notices;
private boolean isSetAnimDuration = false;
private int contentSize;
private int interval = 1000;
private int animDuration = 500;
private int textSize = 14;
private int textColor = 0xffffffff;
private int gravity = Gravity.LEFT | Gravity.CENTER_VERTICAL;
//点击事件
private OnItemClickListener onItemClickListener;
public MarqueeView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context, attrs, 0);
}
private void init(Context context, AttributeSet attrs, int defStyleAttr) {
this.mContext = context;
if (notices == null) {
notices = new ArrayList<>();
}
TypedArray typedArray = getContext().obtainStyledAttributes(attrs, R.styleable.MarqueeViewStyle, defStyleAttr, 0);
interval = typedArray.getInteger(R.styleable.MarqueeViewStyle_mvInterval, interval);
isSetAnimDuration = typedArray.hasValue(R.styleable.MarqueeViewStyle_mvAnimDuration);
animDuration = typedArray.getInteger(R.styleable.MarqueeViewStyle_mvAnimDuration, animDuration);
if (typedArray.hasValue(R.styleable.MarqueeViewStyle_mvTextSize)) {
textSize = (int) typedArray.getDimension(R.styleable.MarqueeViewStyle_mvTextSize, textSize);
textSize = DisplayUtil.px2sp(mContext, textSize);
}
textColor = typedArray.getColor(R.styleable.MarqueeViewStyle_mvTextColor, textColor);
typedArray.recycle();
setFlipInterval(interval);
Animation animIn = AnimationUtils.loadAnimation(mContext, R.anim.anim_marquee_in);
if (isSetAnimDuration) animIn.setDuration(animDuration);
setInAnimation(animIn);
Animation animOut = AnimationUtils.loadAnimation(mContext, R.anim.anim_marquee_out);
if (isSetAnimDuration) animOut.setDuration(animDuration);
setOutAnimation(animOut);
}
// 根据公告字符串启动轮播
public void startWithText(final String notice) {
if (TextUtils.isEmpty(notice)) return;
getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
getViewTreeObserver().removeGlobalOnLayoutListener(this);
startWithFixedWidth(notice, getWidth());
}
});
}
// 根据公告字符串列表启动轮播
public void startWithList(List notices) {
setNotices(notices);
start();
}
// 根据宽度和公告字符串启动轮播
private void startWithFixedWidth(String notice, int width) {
int noticeLength = notice.length();
int dpW = DisplayUtil.px2dip(mContext, width);
int limit = dpW / textSize;
if (dpW == 0) {
throw new RuntimeException("Please set MarqueeView width !");
}
if (noticeLength <= limit) {
notices.add(notice);
} else {
int size = noticeLength / limit + (noticeLength % limit != 0 ? 1 : 0);
for (int i = 0; i < size; i++) {
int startIndex = i * limit;
int endIndex = ((i + 1) * limit >= noticeLength ? noticeLength : (i + 1) * limit);
notices.add(notice.substring(startIndex, endIndex));
}
}
start();
}
// 启动轮播
public boolean start() {
if (notices == null || notices.size() == 0) return false;
removeAllViews();
for (int i = 0; i < notices.size(); i++) {
final TextView textView = createTextView(notices.get(i), i);
final int finalI = i;
textView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (onItemClickListener != null) {
onItemClickListener.onItemClick(finalI, textView);
}
}
});
addView(textView);
}
if (notices.size() > 1) {
startFlipping();
}
return true;
}
// 创建ViewFlipper下的TextView
private TextView createTextView(String text, int position) {
TextView tv = new TextView(mContext);
tv.setGravity(gravity);
tv.setText(text);
tv.setTextColor(textColor);
tv.setTextSize(textSize);
tv.setTag(position);
return tv;
}
public List getNotices() {
return notices;
}
public void setNotices(List notices) {
this.notices = notices;
}
public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
this.onItemClickListener = onItemClickListener;
}
public interface OnItemClickListener {
void onItemClick(int position, TextView textView);
}
} 这就是它实现的方式，我从中加了点击事件，所以它的用法是这样的
verticalSwitchTextView1 = (MarqueeView) rootView.findViewById(R.id.vertical_switch_textview1); Listinfo = new ArrayList<>(); info.add("1.能够适应多行长文本的Android TextView的例子"); info.add("2.\"科比，！"); info.add("3. GitHub帐号：zhangyuanchong"); info.add("4.\"理解的也很简单，"); info.add("5. 破解密钥"); info.add("6. 实现了两种方式"); verticalSwitchTextView1.startWithList(info); verticalSwitchTextView1.setOnItemClickListener(new MarqueeView.OnItemClickListener() { @Override public void onItemClick(int position, TextView textView) { position = position + 1; Toast.makeText(getActivity(), "点击了" + position, Toast.LENGTH_SHORT).show(); } });
这样就直接实现喽，其实还是蛮简单的呢。
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