实现 Android TextView 文字轮播效果

<ViewAnimator
android:layout_width="match_parent"
android:layout_height="200dp">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text=" 欢迎 "/>
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text=" 测试 "/>
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text=" 本程序 "/>
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="!!!!!"/>
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="hello,world"/>
</ViewAnimator>

viewAnimator.setOutAnimation(this, R.anim.slide_out_up);
viewAnimator.setInAnimation(this, R.anim.slide_in_down);

public void showNext() {viewAnimator.showNext();
}
public void showPrevious() {viewAnimator.showPrevious();
} 
Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {super.handleMessage(msg);
if (autoPlayFlag) {showNext();
}
handler.sendMessageDelayed(new Message(), TIME_INTERVAL);
}
};

public void setNoticeList(List<String> list) {
// 创建 TextView
for (int i = 0; i < list.size(); i++) {TextView textView = createTextView(list.get(i));
mNoticeList.add(textView);
addView(textView);
}
// 显示第一条公告
mCurrentNotice = 0;
mNoticeList.get(mCurrentNotice).setVisibility(VISIBLE);
// 启动轮播
start();}
private TextView createTextView(String text) {if (mLayoutParams == null) {
mLayoutParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
mLayoutParams.gravity = Gravity.CENTER_VERTICAL;
}
TextView textView = new TextView(getContext());
textView.setLayoutParams(mLayoutParams);
textView.setSingleLine();
textView.setEllipsize(TextUtils.TruncateAt.END);
textView.setTextColor(mTextColor);
textView.setVisibility(GONE);
textView.setText(text);
// 如果有设置字体大小，如果字体大小为 null。if (mTextSize > 0) {textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, mTextSize);
}
return textView;
}

class NoticeRunnable implements Runnable {
@Override
public void run() {
// 隐藏当前的 textView
TextView currentView = mNoticeList.get(mCurrentNotice);
currentView.setVisibility(GONE);
if(mExitAnimSet != null) {currentView.startAnimation(mExitAnimSet);
}
mCurrentNotice++;
if(mCurrentNotice >= mNoticeList.size()) {mCurrentNotice = 0;}
// 显示下一个 TextView
TextView nextView = mNoticeList.get(mCurrentNotice);
nextView.setVisibility(VISIBLE);
if(mEnterAnimSet != null) {nextView.startAnimation(mEnterAnimSet);
}
mHandler.postDelayed(this, mNoticeDuration);
}
}
private void createEnterAnimation() {mEnterAnimSet = new AnimationSet(false);
TranslateAnimation translateAnimation =
new TranslateAnimation(0,0,0,0, TranslateAnimation.RELATIVE_TO_PARENT, 1f,
TranslateAnimation.RELATIVE_TO_SELF, 0f);
AlphaAnimation alphaAnimation = new AlphaAnimation(0f,1f);
mEnterAnimSet.addAnimation(translateAnimation);
mEnterAnimSet.addAnimation(alphaAnimation);
mEnterAnimSet.setDuration(DEFAULT_ANIMATION_DURATION);
}
private void createExitAnimation() {mExitAnimSet = new AnimationSet(false);
TranslateAnimation translateAnimation =
new TranslateAnimation(0,0,0,0, TranslateAnimation.RELATIVE_TO_SELF, 0f,
TranslateAnimation.RELATIVE_TO_PARENT, -1f);
AlphaAnimation alphaAnimation = new AlphaAnimation(1f,0f);
mExitAnimSet.addAnimation(translateAnimation);
mExitAnimSet.addAnimation(alphaAnimation);
mExitAnimSet.setDuration(DEFAULT_ANIMATION_DURATION);
}

/** 初始化控件 */
private void init(Context context, AttributeSet attrs, int defStyleAttr) {mViewFlipper = new ViewFlipper(getContext());//new 一个 ViewAnimator
mViewFlipper.setLayoutParams(new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
addView(mViewFlipper);
startViewAnimator();
// 设置点击事件
mViewFlipper.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {int position = mViewFlipper.getDisplayedChild();// 当前显示的子视图的索引位置
if (mListener!=null){mListener.onItemClick(mDatas.get(position),position);
}
}
});
2. 根据数据添加 itemView
/** 设置数据集合 */
public void setDatas(List<String> datas){
this.mDatas = datas;
if (DisplayUtils.notEmpty(mDatas)){mViewFlipper.removeAllViews();
for (int i = 0; i < mDatas.size(); i++) {TextView textView = new TextView(getContext());
textView.setText(mDatas.get(i));
// 任意设置你的文字样式，在这里
textView.setSingleLine(isSingleLine);
textView.setTextColor(mTextColor);
textView.setTextSize(mTextSize);
textView.setGravity(mGravity);
mViewFlipper.addView(textView,i);// 添加子 view, 并标识子 view 位置
}
}
}

/**
* 设置进入动画和离开动画
*
* @param inAnimResId 进入动画的 resID
* @param outAnimResID 离开动画的 resID
*/
private void setInAndOutAnimation(@AnimRes int inAnimResId, @AnimRes int outAnimResID) {Animation inAnim = AnimationUtils.loadAnimation(getContext(), inAnimResId);
inAnim.setDuration(animDuration);
mViewFlipper.setInAnimation(inAnim);
Animation outAnim = AnimationUtils.loadAnimation(getContext(), outAnimResID);
outAnim.setDuration(animDuration);
mViewFlipper.setOutAnimation(outAnim);
}