安卓listview adapter

1.首先添加一个布局listview

    //android:divider="@null"去掉listview分割线
    
    

2.创建一个activity加载listview布局

public class RedPageActivity extends Activity {
    private ListView lv;
    //判断复用问题的map int坐标 bool为是否加载过 true为存在 falsely不存在
    private Map selectedMap=new HashMap<>();
    //提供了一种关于显示的通用信息，如显示大小，分辨率和字体
    DisplayMetrics dm = new DisplayMetrics();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //加载listview布局
        setContentView(R.layout.activity_redpage);
        //获取listview
        lv=(ListView)findViewById(R.id.redpageList);
        //初始化map的数据 都为false
        for (int i = 0; i < 10; i++) {
            selectedMap.put(i, false);
        }
        getWindowManager().getDefaultDisplay().getMetrics(dm);
        //获取系统宽度
        System.out.println("dm"+dm.widthPixels);
        //创建的adapter
        RedpageActivityAdapter redpageAdapter=new RedpageActivityAdapter(this,selectedMap,dm);
        //给listview设置适配器
        lv.setAdapter(redpageAdapter);
        //点击事件
        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView parent, View view, int position, long id) {
                System.out.println("aaa"+position);
                //判断复用问题 
                //不存在就put
                if (!selectedMap.containsKey(position)){
                    selectedMap.put(position,true);
                }
                else{
                    //存在就改变
                    boolean isCheck=selectedMap.get(position);
                    selectedMap.put(position,!isCheck);
                }

                RedpageActivityAdapter.ViewHolder viewHolder = (RedpageActivityAdapter.ViewHolder) parent.getTag();
                //一个属性动画
                ObjectAnimator animator = ObjectAnimator.ofFloat(view.findViewById(R.id.redup), "translationX", 0, -(dm.widthPixels));
                ObjectAnimator animator2 = ObjectAnimator.ofFloat(view.findViewById(R.id.redback), "translationX", 0, -(dm.widthPixels));
                AnimatorSet animSet=new AnimatorSet();
                animSet.playTogether(animator,animator2);
                animSet.setDuration(400);
                animSet.start();
            }
        });

    }
}

3创建RedpageActivityAdapter

public class RedpageActivityAdapter extends BaseAdapter {
    //数据集合
    private List arrayList=new ArrayList();
    //上下文对象
    private Context context;
    private Map map;
    DisplayMetrics dm;
    public RedpageActivityAdapter(Context context,Map map,DisplayMetrics dm) {
        this.context=context;
        this.map=map;
        this.dm=dm;
        System.out.println("dm"+dm);
        //一些假数据
        for (int i=0;i<10;i++){
            arrayList.add("zzz"+i);
        }
    }
    //集合的长度
    @Override
    public int getCount() {
        return arrayList!=null&&arrayList.size()>0?arrayList.size():0;
    }
    //获取item
    @Override
    public Object getItem(int position) {
        return arrayList!=null&&arrayList.size()>0?arrayList.get(position):null;
    }
    //根据位置获取item
    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if(convertView==null){
            holder = new ViewHolder();

            convertView = LayoutInflater.from(context).inflate(R.layout.adapter_red_page_fragment, null);
            holder.relative=(RelativeLayout) convertView.findViewById(R.id.relative);
            AbsListView.LayoutParams params=new AbsListView.LayoutParams((int)(dm.widthPixels-20*dm.density),(int)(dm.widthPixels-20*dm.density)/2);
            holder.relative.setLayoutParams(params);
            holder.redaon=(ImageView) convertView.findViewById(R.id.redaon);
            holder.redback=(ImageView) convertView.findViewById(R.id.redback);
            holder.redup=(ImageView) convertView.findViewById(R.id.redup);
            holder.textView=(TextView)convertView.findViewById(R.id.textView);



//            holder.relative.setOnClickListener(new View.OnClickListener() {
//                @Override
//                public void onClick(View v) {
//
//                    int index=((ViewGroup)v.getParent()).indexOfChild(v);
//                    System.out.println("aaaa"+index);
//                    System.out.println("aaaa"+v.getId());
//                    float curTranslationX = v.findViewById(R.id.redup).getTranslationX();
//                    ObjectAnimator animator = ObjectAnimator.ofFloat(v.findViewById(R.id.redup), "translationX", curTranslationX, -600f);
//                    ObjectAnimator animator2 = ObjectAnimator.ofFloat(v.findViewById(R.id.redback), "translationX", curTranslationX, -500f);
////                    animator.setDuration(5000);
////                    animator.start();
//                    AnimatorSet animSet = new AnimatorSet();
//                    animSet.playTogether(animator,animator2);
//                    animSet.setDuration(500);
//                    animSet.start();
//                }
//            });
            convertView.setTag(holder);
        }else{
            holder = (ViewHolder)convertView.getTag();//取出ViewHolder对象
        }
        //holder.redup.setImageResource(R.id.redup);
        holder.textView.setText(getItem(position).toString());
        boolean flag=map.get(position);
        
        if(flag){
            //移动当前的
            ObjectAnimator animator = ObjectAnimator.ofFloat(holder.redup, "translationX", 0, -(dm.widthPixels));
            ObjectAnimator animator2 = ObjectAnimator.ofFloat(holder.redback, "translationX", 0, -(dm.widthPixels));
            AnimatorSet animSet=new AnimatorSet();
            animSet.playTogether(animator,animator2);
            animSet.setDuration(0);
            animSet.start();
        }else {
            //原始位置
            ObjectAnimator animator = ObjectAnimator.ofFloat(holder.redup, "translationX", 0, -0);
            ObjectAnimator animator2 = ObjectAnimator.ofFloat(holder.redback, "translationX", 0, -0);
            AnimatorSet animSet=new AnimatorSet();
            animSet.playTogether(animator,animator2);
            animSet.setDuration(0);
            animSet.start();
        }
        return convertView;
    }
    //自定义viewholder用于初始化话控件
    public class ViewHolder {
        private RelativeLayout layout;
        public ImageView redback;
        public ImageView redaon;
        public ImageView redup;
        public TextView textView;
        RelativeLayout relative;


    }
}

4.listview中的小布局

大概效果

效果