ListView的MyBaseAdapter的封装

import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;

import java.lang.reflect.Array;
import java.util.ArrayList;

import cn.loaderman.holder.BaseHolder;
import cn.loaderman.holder.HomeHolder;
import cn.loaderman.utils.ItemAnimationUtils;

import static android.icu.lang.UCharacter.GraphemeClusterBreak.T;

/**
 *
 * 封装的思想：
 *  抽取基类：
 *      在基类中做的一般都是通用的事情
 *      不通用的事情
 *          1、父类不知道如何完成的事情，通过抽象方法来交给子类实现
 *          2、父类不知道的数据类型，通过泛型来解决，泛型是自定义的一种不存在的类型，这种类型究竟是啥，在定义子类的时候确定
 *              尖括号的位置
 *                  如果在自己的类名后面，代表定义了一个泛型
 *                  如果跟在父类的名称后面，代表确定父类所定义的泛型类型
 *
 */

public abstract class MyBaseAdapter<T> extends BaseAdapter {

    private ArrayList<T> dataList;

    public MyBaseAdapter(ArrayList<T> dataList) {
        this.dataList = dataList;
    }

    @Override
    public int getCount() {
        return dataList.size();
    }

    @Override
    public Object getItem(int position) {
        return dataList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        BaseHolder holder = null;
        if(convertView == null) {
            holder = getHolder(position);
        } else {
            holder = (BaseHolder) convertView.getTag();
        }

        holder.setData(dataList.get(position));

        ItemAnimationUtils.startAnim(holder.convertView);

        return holder.convertView;
    }

    public abstract BaseHolder getHolder(int position);
}

 BaseHolder.java

import android.view.View;
/**
 *  1、加载布局文件  convertView，布局文件的id
 *  2、初始化控件  TextView、convertView、Holder
 * 3、存储holder  Holder、convertView
 * 4、刷新控件的数据 TextView、数据
 */

public abstract class BaseHolder<T> {
    public View convertView;
    public T data;
    public BaseHolder() {
        convertView = initView();
        convertView.setTag(this);
    }
    public void setData(T data) {
        if(data != null) {
            this.data = data;
        }
        refreshView();
    }
    public abstract View initView() ;
    public abstract void refreshView();
}

 ItemAnimationUtils.java

public class ItemAnimationUtils {

    public static void startAnim(View view) {

        ObjectAnimator objectAnimator = ObjectAnimator.ofFloat(view,"alpha",0.0f,1.0f);
        objectAnimator.setDuration(500);
        objectAnimator.start();

        /*AlphaAnimation alphaAnimation = new AlphaAnimation(0.0f, 1.0f);
        alphaAnimation.setDuration(500);
        alphaAnimation.setFillAfter(true);*/

        //view.setScaleX();

        /*view.setPivotX(0);
        view.setPivotY(0);*/
        ObjectAnimator objectAnimatorX = ObjectAnimator.ofFloat(view,"scaleX",0.5f,1.0f);
        objectAnimatorX.setDuration(500);
        objectAnimatorX.start();
        ObjectAnimator objectAnimatorY = ObjectAnimator.ofFloat(view,"scaleY",0.5f,1.0f);
        objectAnimatorY.setDuration(500);
        objectAnimatorY.start();

       /* ScaleAnimation scaleAnimation = new ScaleAnimation(0.5f,1.0f,0.5f,1.0f);

        scaleAnimation.setDuration(500);
        scaleAnimation.setFillAfter(true);

        AnimationSet animationSet = new AnimationSet(true);
        //设置动画的插入器
        animationSet.setInterpolator(new OvershootInterpolator(2));

        animationSet.addAnimation(alphaAnimation);
        animationSet.addAnimation(scaleAnimation);


        view.startAnimation(animationSet);*/

    }
}