今天搬砖赚了500，你以为我要给你450，然后留50吃泡面。
不！！！ 你格局小了！！！
我会再向朋友再借20凑520给你。—广州 · 14℃ · 阴天 · 天暗下来，你就是阳光~
效果展示
如何实现？
首先感谢一下编写NoticeView控件的作者，GitHub传送门：https://github.com/czy1121/noticeview ，喜欢的朋友可以为他点下star。
为了方便大家使用，在下面贴出控件源码，直接复制过去就可以使用：
- NoticeView控件的属性，在res/values文件下定义一个attrs.xml文件，代码如下：
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="NoticeView">
<!-- 图标 -->
<attr name="nvIcon" format="reference"/>
<!-- 图标与内容的间隙 -->
<attr name="nvIconPadding" format="dimension"/>
<!-- 图标颜色 -->
<attr name="nvIconTint" format="color"/>
<!-- 文本尺寸 -->
<attr name="nvTextSize" format="dimension"/>
<!-- 文本颜色 -->
<attr name="nvTextColor" format="color"/>
<!-- 文本最大行数 -->
<attr name="nvTextMaxLines" format="integer"/>
<!-- 文本对齐方式 -->
<attr name="nvTextGravity" format="integer">
<enum name="left" value="3"/>
<enum name="center" value="17"/>
<enum name="right" value="5"/>
</attr>
<!-- 切换动画间隔时间，毫秒 -->
<attr name="nvInterval" format="integer"/>
<!-- 切换动画持续时间，毫秒 -->
<attr name="nvDuration" format="integer"/>
</declare-styleable>
</resources>
- NoticeView源码：
public class NoticeView extends TextSwitcher {
private Animation mInUp = anim(1.5f, 0);
private Animation mOutUp = anim(0, -1.5f);
private List<String> mDataList = new ArrayList<>();
private int mIndex = 0;
private int mInterval = 4000;
private int mDuration = 900;
private Drawable mIcon;
private int mIconTint = 0xff999999;
private int mIconPadding = 0;
private int mPaddingLeft = 0;
private boolean mIsVisible = false;
private boolean mIsStarted = false;
private boolean mIsResumed = true;
private boolean mIsRunning = false;
private final TextFactory mDefaultFactory = new TextFactory();
private final Runnable mRunnable = new Runnable() {
@Override
public void run() {
if (mIsRunning) {
show(mIndex + 1);
postDelayed(mRunnable, mInterval);
}
}
};
public NoticeView(Context context) {
this(context, null);
}
public NoticeView(Context context, AttributeSet attrs) {
super(context, attrs);
initWithContext(context, attrs);
setInAnimation(mInUp);
setOutAnimation(mOutUp);
setFactory(mDefaultFactory);
mInUp.setDuration(mDuration);
mOutUp.setDuration(mDuration);
}
private void initWithContext(Context context, AttributeSet attrs) {
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.NoticeView);
mIcon = a.getDrawable(R.styleable.NoticeView_nvIcon);
mIconPadding = (int)a.getDimension(R.styleable.NoticeView_nvIconPadding, 0);
boolean hasIconTint = a.hasValue(R.styleable.NoticeView_nvIconTint);
if (hasIconTint) {
mIconTint = a.getColor(R.styleable.NoticeView_nvIconTint, 0xff999999);
}
mInterval = a.getInteger(R.styleable.NoticeView_nvInterval, 4000);
mDuration = a.getInteger(R.styleable.NoticeView_nvDuration, 900);
mDefaultFactory.resolve(a);
a.recycle();
if (mIcon != null) {
mPaddingLeft = getPaddingLeft();
int realPaddingLeft = mPaddingLeft + mIconPadding + mIcon.getIntrinsicWidth();
setPadding(realPaddingLeft, getPaddingTop(), getPaddingRight(), getPaddingBottom());
if (hasIconTint) {
mIcon = mIcon.mutate();
DrawableCompat.setTint(mIcon, mIconTint);
}
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if (mIcon != null) {
int y = (getMeasuredHeight() - mIcon.getIntrinsicWidth()) / 2;
mIcon.setBounds(mPaddingLeft, y, mPaddingLeft + mIcon.getIntrinsicWidth(), y + mIcon.getIntrinsicHeight());
}
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mIcon != null) {
mIcon.draw(canvas);
}
}
public int getIndex() {
return mIndex;
}
public void start(List<String> list) {
mDataList = list;
if (mDataList == null || mDataList.size() < 1) {
mIsStarted = false;
update();
} else {
mIsStarted = true;
update();
show(0);
}
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
mIsVisible = false;
update();
}
@Override
protected void onWindowVisibilityChanged(int visibility) {
super.onWindowVisibilityChanged(visibility);
mIsVisible = visibility == VISIBLE;
update();
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
int action = ev.getAction();
switch (action) {
case MotionEvent.ACTION_DOWN:
mIsResumed = false;
update();
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
mIsResumed = true;
update();
break;
}
return super.dispatchTouchEvent(ev);
}
private void update() {
boolean running = mIsVisible && mIsResumed && mIsStarted;
if (running != mIsRunning) {
if (running) {
postDelayed(mRunnable, mInterval);
} else {
removeCallbacks(mRunnable);
}
mIsRunning = running;
}
Log.e("ezy", "update() visible=" + mIsVisible + ", started=" + mIsStarted + ", running=" + mIsRunning);
}
private void show(int index) {
mIndex = index % mDataList.size();
setText(Html.fromHtml(mDataList.get(mIndex)));
}
private Animation anim(float from, float to) {
final TranslateAnimation anim = new TranslateAnimation(0, 0f, 0, 0f, Animation.RELATIVE_TO_PARENT, from, Animation.RELATIVE_TO_PARENT, to);
anim.setDuration(mDuration);
anim.setFillAfter(false);
anim.setInterpolator(new LinearInterpolator());
return anim;
}
class TextFactory implements ViewFactory {
DisplayMetrics dm = getContext().getResources().getDisplayMetrics();
float size = dp2px(14);
int color = 1;
int lines = 1;
int gravity = Gravity.LEFT;
void resolve(TypedArray ta) {
lines = ta.getInteger(R.styleable.NoticeView_nvTextMaxLines, lines);
size = ta.getDimension(R.styleable.NoticeView_nvTextSize, size);
color = ta.getColor(R.styleable.NoticeView_nvTextColor, color);
gravity = ta.getInteger(R.styleable.NoticeView_nvTextGravity, gravity);
}
private int dp2px(float dp) {
return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, dm);
}
@Override
public View makeView() {
TextView tv = new TextView(getContext());
tv.setTextSize(TypedValue.COMPLEX_UNIT_PX, size);
tv.setMaxLines(lines);
if (color != 1) {
tv.setTextColor(color);
}
tv.setEllipsize(TextUtils.TruncateAt.END);
tv.setGravity(Gravity.CENTER_VERTICAL | gravity);
tv.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
return tv;
}
}
}
使用起来非常简单：
final String[] test = new String[]{
"须知少时凌云志，",
"曾许人间第一流。",
"哪晓岁月蹉跎过，",
"依然名利两无收。"
};
noticeView = findViewById(R.id.nv_notice);
noticeView.start(Arrays.asList(test));
noticeView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO: 2021/3/21
Toast.makeText(XXActivity.this, test[noticeView.getIndex()], Toast.LENGTH_SHORT).show();
}
});
但是需要注意一点，如果没给NoticeView设置setOnClickListener点击事件，那么当NoticeView在轮播时被点击后会出现暂停现象，并且它也不会自动恢复轮播，无论再怎么点击NoticeView，它都会一直处于停止状态。
如果NoticeView只是用于显示信息轮播，不需要监听其点击事件，那可以在NoticeView里面将dispatchTouchEvent()删掉就好了。
非常感谢你能看到这里，如果能够帮助到你是我的荣幸！
转载：https://blog.csdn.net/qq_36270361/article/details/115048571
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