安卓listview adapter

1.首先添加一个布局listview

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical" android:layout_width="match_parent"    android:layout_height="match_parent">    //android:divider="@null"去掉listview分割线    <ListView        android:id="@+id/redpageList"        android:divider="@null"        android:layout_width="wrap_content"        android:layout_height="wrap_content">    </ListView></LinearLayout>

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<Integer,Boolean> 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<Integer,Boolean> map;    DisplayMetrics dm;    public RedpageActivityAdapter(Context context,Map<Integer,Boolean> 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

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/relative"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:padding="10dp"    >    <ImageView        android:id="@+id/redback"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:background="@mipmap/redback"        />    <ImageView        android:id="@+id/redaon"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:background="@mipmap/redaon"        android:gravity="center_vertical"        android:layout_margin="10dp"        />    <!--android:layout_centerVertical="true"-->    <ImageView        android:id="@+id/redup"        android:layout_marginRight="100dp"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:background="@mipmap/redup"        />    <TextView        android:id="@+id/textView"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:textSize="20dp"        />    <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:textSize="20dp"        android:text="44444444"        android:layout_below="@+id/textView"        /></RelativeLayout>

大概效果

效果