Android文字广告（Textview上下滚动），使用TextSwitcher控件的完整实现

曾经终败给现在 2022-12-11 01:30 448阅读 0赞

实现步骤：

a、xml布局

b、TextSwitchBanner.java

import android.content.Context;
    import android.graphics.Color;
    import android.os.Handler;
    import android.text.TextUtils;
    import android.view.Gravity;
    import android.view.View;
    import android.view.animation.AlphaAnimation;
    import android.view.animation.Animation;
    import android.view.animation.AnimationSet;
    import android.view.animation.TranslateAnimation;
    import android.widget.TextSwitcher;
    import android.widget.TextView;
    import android.widget.ViewSwitcher;
    
    import java.util.List;
    
    /**
     * 结合TextSwitcher空间实现文字广告，轮播
     */
    public class TextSwitchBanner implements ViewSwitcher.ViewFactory, View.OnClickListener {
    
        private Context context;
        private TextSwitcher textSwitcher;
        private List<String> texts;
        private OnItemClickLitener listener;
    
        private int marker;
        private AnimationSet InAnimationSet;
        private AnimationSet OutAnimationSet;
    
        private int delayTime = 2000;
        private static final int DURATION = 1000;
    
        private Handler handler = new Handler();
        private Runnable task = new Runnable() {
            @Override
            public void run() {
                nextView();
                handler.postDelayed(task, delayTime * 2);
            }
        };
    
        public TextSwitchBanner(Context context, TextSwitcher textSwitcher) {
            this.context = context;
            this.textSwitcher = textSwitcher;
            init();
        }
    
        private void init() {
            textSwitcher.setFactory(this);
            textSwitcher.setText("");
            createAnimation();
            textSwitcher.setInAnimation(InAnimationSet);
            textSwitcher.setOutAnimation(OutAnimationSet);
            textSwitcher.setOnClickListener(this);
        }
    
        @Override
        public View makeView() {
            TextView textView = new TextView(context);
            textView.setGravity(Gravity.START);
            textView.setSingleLine(true);
            textView.setGravity(Gravity.CENTER_VERTICAL);
            textView.setEllipsize(TextUtils.TruncateAt.END);
            textView.setTextColor(Color.BLACK);
            return textView;
        }
    
        @Override
        public void onClick(View v) {
            if(listener != null && texts != null && texts.size() != 0){
                listener.onClick(texts, marker);
            }
        }
    
        public void update(List<String> list){
            if(list == null || list.size() == 0){
                return;
            }
            stop();
            texts = list;
            marker = 0;
            textSwitcher.setText(texts.get(0));
            start();
        }
    
        public void start() {
            stop();
            handler.postDelayed(task, delayTime);
        }
    
        public void stop(){
            handler.removeCallbacks(task);
        }
    
        public int getMarker() {
            return marker;
        }
    
        public TextSwitchBanner setTexts(List<String> texts) {
            this.texts = texts;
            return this;
        }
    
        public void setDelayTime(int delayTime) {
            this.delayTime = delayTime;
        }
    
        private void createAnimation() {
            AlphaAnimation alphaAnimation;
            TranslateAnimation translateAnimation;
    
            int h = textSwitcher.getHeight();
            if (h <= 0) {
                textSwitcher.measure(0,0);
                h = textSwitcher.getMeasuredHeight();
            }
    
            InAnimationSet = new AnimationSet(true);
            OutAnimationSet = new AnimationSet(true);
    
            alphaAnimation = new AlphaAnimation(0,1);
            translateAnimation = new TranslateAnimation(Animation.ABSOLUTE, 0, Animation.ABSOLUTE, 0,
                    Animation.ABSOLUTE, h, Animation.ABSOLUTE, 0);
            InAnimationSet.addAnimation(alphaAnimation);
            InAnimationSet.addAnimation(translateAnimation);
            InAnimationSet.setDuration(DURATION);
    
            alphaAnimation = new AlphaAnimation(1,0);
            translateAnimation = new TranslateAnimation(Animation.ABSOLUTE, 0, Animation.ABSOLUTE, 0,
                    Animation.ABSOLUTE, 0, Animation.ABSOLUTE, -h);
            OutAnimationSet.addAnimation(alphaAnimation);
            OutAnimationSet.addAnimation(translateAnimation);
            OutAnimationSet.setDuration(DURATION);
        }
    
        private void nextView() {
            marker = ++marker % texts.size();
            textSwitcher.setText(texts.get(marker));
        }
    
        public interface OnItemClickLitener{
            void onClick(List<String> list, int position);
        }
    
        public void setOnItemClickListener(OnItemClickLitener listener){
            this.listener = listener;
        }
    
    }

c、MainActivity.java

private TextSwitcher m_textSwitcher;

m_textSwitcher = m_view.findViewById(R.id.textSwitcher);

/**
         * 初始化textbanner
         */
        private void initTextBanner() {
            m_textSwitchBanner = new TextSwitchBanner(getActivity(), m_textSwitcher);
            m_textSwitchBanner.setOnItemClickListener(new TextSwitchBanner.OnItemClickLitener() {
                @Override
                public void onClick(List<String> list, int position) {
                    ToastUtils.s(getActivity(), "click: " + position);
                }
            });
        }

/**
         * 更新文字广告
         */
        private void updateTextViewBanner() {
            List<String> list = new ArrayList<>();
            for (int i = 0; i < m_listMsgInfo.size(); i++) {
                list.add(m_listMsgInfo.get(i).getTitle());
            }
            m_textSwitchBanner.update(list);
        }

完！！！