Android中SmartRefreshLayout自定义加载headview 小白级别

先来看效果图

使用下拉刷新上拉加载控件SmartRefreshLayout，产品觉得要用UI设计的加载图，于是就有了小白级代码出来了，由于项目工期紧，就顺便写点吧，后期有时间还有这种冲动就来优化吧，使用SmartRefreshLayout的应该都知道它的结构大致：

    //刷新header
    //包含的View
    //加载footer

既然要用自定义的，那就需要我们自定义ClassicsHeader，于是自己就写了ClassicsHeader

package com.text.demo.widget;

import android.content.Context;
import android.graphics.drawable.AnimationDrawable;
import android.graphics.drawable.Drawable;
import android.support.annotation.ColorInt;
import android.support.annotation.NonNull;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;

import com.scwang.smartrefresh.layout.api.RefreshHeader;
import com.scwang.smartrefresh.layout.api.RefreshKernel;
import com.scwang.smartrefresh.layout.api.RefreshLayout;
import com.scwang.smartrefresh.layout.constant.RefreshState;
import com.scwang.smartrefresh.layout.constant.SpinnerStyle;
import com.scwang.smartrefresh.layout.util.DensityUtil;
import com.text.demo.R;


/**
 * 类说明：自定义header
 * 作者：lp
 * 时间：2019/8/9
 */
public class ClassicsHeader extends LinearLayout implements RefreshHeader {

    private ImageView mProgressView;//刷新动画视图
    private AnimationDrawable mProgressDrawable;//刷新动画

    public ClassicsHeader(Context context) {
        super(context);
        initView(context);
    }

    public ClassicsHeader(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.initView(context);
    }

    public ClassicsHeader(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        this.initView(context);
    }

    private void initView(Context context) {
        setGravity(Gravity.CENTER);
        mProgressDrawable = new AnimationDrawable();
        //准备好资源图片
        int[] ids = {R.drawable.loading0, R.drawable.loading1, R.drawable.loading2, R.drawable.loading3, R.drawable.loading4, R.drawable.loading5, R.drawable.loading6,R.drawable.loading7,R.drawable.loading8,R.drawable.loading9};
        //通过for循环添加每一帧动画
        for (int i = 0; i < ids.length; i++) {
            Drawable frame = getResources().getDrawable(ids[i]);
            //设定时长
            mProgressDrawable.addFrame(frame, 100);
        }
        mProgressView = new ImageView(context);
        mProgressView.setImageDrawable(mProgressDrawable);

        addView(mProgressView, DensityUtil.dp2px(100), DensityUtil.dp2px(100));
        setMinimumHeight(DensityUtil.dp2px(60));
    }

    @NonNull
    public View getView() {
        return this;//真实的视图就是自己，不能返回null
    }

    @Override
    public SpinnerStyle getSpinnerStyle() {
        return SpinnerStyle.Translate;//指定为平移，不能null
    }

    @Override
    public void onStartAnimator(RefreshLayout layout, int headHeight, int maxDragHeight) {
        mProgressDrawable.start();//开始动画
    }

    @Override
    public int onFinish(RefreshLayout layout, boolean success) {
        mProgressDrawable.stop();//停止动画
        return 500;//延迟500毫秒之后再弹回
    }

    @Override
    public void onStateChanged(RefreshLayout refreshLayout, RefreshState oldState, RefreshState newState) {
        switch (newState) {
            case None:
            case PullDownToRefresh:
            case Refreshing:
                mProgressView.setVisibility(VISIBLE);//隐藏动画
                break;
            case ReleaseToRefresh:
                break;
        }
    }

    @Override
    public boolean isSupportHorizontalDrag() {
        return false;
    }

    @Override
    public void onInitialized(RefreshKernel kernel, int height, int maxDragHeight) {
    }

    @Override
    public void onMoving(boolean isDragging, float percent, int offset, int height, int maxDragHeight) {

    }

    @Override
    public void onReleased(@NonNull RefreshLayout refreshLayout, int height, int maxDragHeight) {

    }

    @Override
    public void onHorizontalDrag(float percentX, int offsetX, int offsetMax) {
    }

    @Override
    public void setPrimaryColors(@ColorInt int... colors) {
    }
}

基本就是这样了，footer和header类似，可以参考官方文档，加油啦