android 仿京东抢购上下轮播消息

来源：互联网发布：java 创建redis连接池编辑：程序博客网时间：2024/05/19 17:52

京东app有个上下轮播消息,就是textview轮播显示商品名称,这个是在github上看到别人写的,地址：https://github.com/LeeYawei/Android-TipView 感谢作者,在这把代码贴下：

布局文件：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="#F9CDAD"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    >    <com.example.looptextview.LooperTextView        android:id="@+id/looperview"        android:layout_width="match_parent"        android:layout_height="60px"        android:layout_marginTop="10px"        android:background="#00ffff"        android:padding="10dp"       /></RelativeLayout>

自定义view实现上下轮播的view

package com.example.looptextview;import android.content.Context;import android.graphics.Color;import android.graphics.drawable.Drawable;import android.text.TextUtils;import android.util.AttributeSet;import android.util.TypedValue;import android.view.Gravity;import android.view.animation.Animation;import android.view.animation.DecelerateInterpolator;import android.view.animation.TranslateAnimation;import android.widget.FrameLayout;import android.widget.TextView;import java.util.List;import java.util.Random;/** * Created by Adminis on 2016/8/14. */public class LooperTextView extends FrameLayout{    private List<String> tipList;    private int curTipIndex = 0;    private long lastTimeMillis ;    private static final int ANIM_DELAYED_MILLIONS = 3 * 1000;    /**  动画持续时长  */    private static final int ANIM_DURATION = 1* 1000;    private static final String DEFAULT_TEXT_COLOR = "#2F4F4F";    private static final int DEFAULT_TEXT_SIZE = 16;    private Drawable head_boy,head_girl;    private TextView tv_tip_out,tv_tip_in;    private static final String TIP_PREFIX = "是我老婆 ";    private Animation anim_out, anim_in;    public LooperTextView(Context context) {        super(context);        initTipFrame();        initAnimation();    }    public LooperTextView(Context context, AttributeSet attrs) {        super(context, attrs);        initTipFrame();        initAnimation();    }    public LooperTextView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        initTipFrame();        initAnimation();    }    private void initTipFrame() {        head_boy = loadDrawable(R.mipmap.user_head_boy);        head_girl = loadDrawable(R.mipmap.user_head_girl);        tv_tip_out = newTextView();        tv_tip_in = newTextView();        addView(tv_tip_in);        addView(tv_tip_out);    }    private TextView newTextView(){        TextView textView = new TextView(getContext());        LayoutParams lp = new LayoutParams(                LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT, Gravity.CENTER_VERTICAL);        textView.setLayoutParams(lp);        textView.setCompoundDrawablePadding(10);        textView.setGravity(Gravity.CENTER_VERTICAL);        textView.setLines(2);        textView.setEllipsize(TextUtils.TruncateAt.END);        textView.setTextColor(Color.parseColor(DEFAULT_TEXT_COLOR));        textView.setTextSize(TypedValue.COMPLEX_UNIT_DIP, DEFAULT_TEXT_SIZE);        return textView;    }    /**     *  将资源图片转换为Drawable对象     * @param ResId     * @return     */    private Drawable loadDrawable(int ResId) {        Drawable drawable = getResources().getDrawable(ResId);        drawable.setBounds(0, 0, drawable.getMinimumWidth() - 10, drawable.getMinimumHeight() - 10);        return drawable;    }    private void initAnimation() {        anim_out = newAnimation(0, -1);        anim_in = newAnimation(1, 0);        anim_in.setAnimationListener(new Animation.AnimationListener() {            @Override            public void onAnimationStart(Animation animation) {            }            @Override            public void onAnimationRepeat(Animation animation) {            }            @Override            public void onAnimationEnd(Animation animation) {                updateTipAndPlayAnimationWithCheck();            }        });    }    private Animation newAnimation(float fromYValue, float toYValue) {        Animation anim = new TranslateAnimation(Animation.RELATIVE_TO_SELF,0,Animation.RELATIVE_TO_SELF,0,                Animation.RELATIVE_TO_SELF,fromYValue,Animation.RELATIVE_TO_SELF, toYValue);        anim.setDuration(ANIM_DURATION);        anim.setStartOffset(ANIM_DELAYED_MILLIONS);        anim.setInterpolator(new DecelerateInterpolator());        return anim;    }    private void updateTipAndPlayAnimationWithCheck() {        if (System.currentTimeMillis() - lastTimeMillis < 1000 ) {            return ;        }        lastTimeMillis = System.currentTimeMillis();        updateTipAndPlayAnimation();    }    private void updateTipAndPlayAnimation() {        if (curTipIndex % 2 == 0) {            updateTip(tv_tip_out);            tv_tip_in.startAnimation(anim_out);            tv_tip_out.startAnimation(anim_in);            this.bringChildToFront(tv_tip_in);        } else {            updateTip(tv_tip_in);            tv_tip_out.startAnimation(anim_out);            tv_tip_in.startAnimation(anim_in);            this.bringChildToFront(tv_tip_out);        }    }    private void updateTip(TextView tipView) {        if (new Random().nextBoolean()) {            tipView.setCompoundDrawables(head_boy, null, null, null);        } else {            tipView.setCompoundDrawables(head_girl, null, null, null);        }        String tip = getNextTip();        if(!TextUtils.isEmpty(tip)) {            tipView.setText(tip+TIP_PREFIX);        }    }    /**     *  获取下一条消息     * @return     */    private String getNextTip() {        if (isListEmpty(tipList)) return null;        return tipList.get(curTipIndex++ % tipList.size());    }    public static boolean isListEmpty(List list) {        return list == null || list.isEmpty();    }    public void setTipList(List<String> tipList) {        this.tipList = tipList;        curTipIndex = 0;        updateTip(tv_tip_out);        updateTipAndPlayAnimation();    }}

package com.example.looptextview;import android.app.Activity;import android.os.Bundle;import java.util.ArrayList;import java.util.List;public class MainActivity extends Activity {    private static final String TAG ="MainActivity" ;    private LooperTextView looperview;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        looperview = (LooperTextView) findViewById(R.id.looperview);        looperview.setTipList(generateTips());    }    private List<String> generateTips() {        List<String> tips = new ArrayList<>();        tips.add("赵丽颖");        tips.add("杨颖");        tips.add("郑爽");        tips.add("杨幂");        tips.add("刘诗诗");        tips.add("迪丽热巴");        tips.add("李沁");        tips.add("唐嫣");        tips.add("林心如");        tips.add("陈乔恩");        tips.add("范冰冰");        tips.add("刘亦菲");        tips.add("李小璐");        tips.add("佟丽娅");        return tips;    }}

效果图：

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