Android中用SmartRefreshLayout实现ListView列表的数据刷新与加载更多（总结）

这里用到的是第三方插件：SmartRefreshLayout

效果图如下：

使用步骤如下：

1、添加远程依赖

/*刷新和加载*/
implementation 'com.scwang.smartrefresh:SmartRefreshLayout:1.1.0-alpha-14'
implementation 'com.scwang.smartrefresh:SmartRefreshHeader:1.1.0-alpha-14'//没有使用特殊Header，可以不加这行

2、如何在布局文件中使用，代码如下：

（备注：SmartRefreshLayout分为三块：Header布局，Content布局，Footer布局。其中，Content内容布局必须是一个整体。例如，下面的布局包括图片，文字，列表等等，用一个ScrollView包起来。）

3、布局文件知道怎么用了，下面说一下如何在Activity中使用，代码如下：

其实分为以下几步即可：

(1) 实现OnRefreshListener和OnLoadMoreListener接口方法。（刷新和加载）

(2) 给smartRefreshLayout添加监听事件。

(3) 调用finishRefresh()以及finishLoadMore()结束刷新和加载过程动画。

package com.deepreality.smartrefreshlayoutdemo;

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ScrollView;
import android.widget.TextView;
import android.widget.Toast;

import com.scwang.smartrefresh.layout.SmartRefreshLayout;
import com.scwang.smartrefresh.layout.api.RefreshLayout;
import com.scwang.smartrefresh.layout.listener.OnLoadMoreListener;
import com.scwang.smartrefresh.layout.listener.OnRefreshListener;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity implements OnRefreshListener, OnLoadMoreListener {

    private Context mContext;

    private SmartRefreshLayout smartRefreshLayout;
    private TextView tvRefreshInfo;
    private ListViewNesting lvNewsList;
    private ScrollView scrollView;

    private List tbOrganizationList;
    private List tempTbOrganizationList;
    private Tb_Organization tb_organization;
    private OrganizationListAdapter organizationListAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        baseDataInit();
        bindViews();
        viewsAddListener();
        viewsDataInit();

        scrollView.smoothScrollTo(0, 0);
    }

    private void baseDataInit() {
        mContext = this;
        tb_organization = null;
        tbOrganizationList = new ArrayList<>();
        tempTbOrganizationList = new ArrayList<>();
    }

    private void bindViews() {
        smartRefreshLayout = findViewById(R.id.Main_SRLayout);
        tvRefreshInfo = findViewById(R.id.Main_tvRefreshInfo);
        lvNewsList = findViewById(R.id.Main_lvNewsList);
        scrollView = findViewById(R.id.Main_scrollView);
    }

    private void viewsAddListener() {
        smartRefreshLayout.setOnRefreshListener(this);
        smartRefreshLayout.setOnLoadMoreListener(this);
    }

    private void viewsDataInit() {
        newsListDataRefresh();
    }

    private void newsListDataRefresh() {
        tbOrganizationList.clear();
        for (int i = 0; i < 10; i ++) {
            tb_organization = new Tb_Organization();
            tbOrganizationList.add(tb_organization);
        }
        organizationListAdapter = new OrganizationListAdapter(mContext, tbOrganizationList);
        lvNewsList.setAdapter(organizationListAdapter);
    }

    private void newsListDataLoadMore() {
        for (int i = 0; i < 10; i ++) {
            tb_organization = new Tb_Organization();
            tbOrganizationList.add(tb_organization);
        }
        organizationListAdapter.notifyDataSetChanged();
    }

    @Override
    public void onLoadMore(@NonNull RefreshLayout refreshLayout) {
        newsListDataLoadMore();
        smartRefreshLayout.finishLoadMore();
        Toast.makeText(mContext, "没有更多数据了！", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onRefresh(@NonNull RefreshLayout refreshLayout) {
        newsListDataRefresh();
        smartRefreshLayout.finishRefresh();
        Toast.makeText(mContext, "刷新完成！", Toast.LENGTH_SHORT).show();
    }
}

附加：自定义的HeaderView（FooterView同理）

public class MyCustomRefreshHeader extends LinearLayout implements RefreshHeader {

    private TextView mHeaderText;//标题文本
    private PathsView mArrowView;//下拉箭头
    private ImageView mProgressView;//刷新动画视图
    private ProgressDrawable mProgressDrawable;//刷新动画

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

    public MyCustomRefreshHeader(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        initView(context);
    }

    public MyCustomRefreshHeader(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initView(context);
    }

    private void initView(Context context) {
        setGravity(Gravity.CENTER);
        mHeaderText = new TextView(context);
        mProgressDrawable = new ProgressDrawable();
        mArrowView = new PathsView(context);
        mProgressView = new ImageView(context);
        mProgressView.setImageDrawable(mProgressDrawable);
        mArrowView.parserPaths("M20,12l-1.41,-1.41L13,16.17V4h-2v12.17l-5.58,-5.59L4,12l8,8 8,-8z");
        addView(mProgressView, SmartUtil.dp2px(20), SmartUtil.dp2px(20));
        addView(mArrowView, SmartUtil.dp2px(20), SmartUtil.dp2px(20));
        addView(new View(context), SmartUtil.dp2px(20), SmartUtil.dp2px(20));
        addView(mHeaderText, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        setMinimumHeight(SmartUtil.dp2px(60));
    }

    @NonNull
    @Override
    public View getView() {
        return this;
    }

    @NonNull
    @Override
    public SpinnerStyle getSpinnerStyle() {
        return SpinnerStyle.Translate;
    }

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

    @Override
    public int onFinish(@NonNull RefreshLayout refreshLayout, boolean success) {
        mProgressDrawable.stop();//停止动画
        if (success){
            mHeaderText.setText("刷新完成");
        } else {
            mHeaderText.setText("刷新失败");
        }
        return 500;//延迟500毫秒之后再弹回
    }

    @Override
    public void onStateChanged(@NonNull RefreshLayout refreshLayout, @NonNull RefreshState oldState, @NonNull RefreshState newState) {
        switch (newState) {
            case None:
            case PullDownToRefresh:
                mHeaderText.setText("下拉开始刷新");
                mArrowView.setVisibility(VISIBLE);//显示下拉箭头
                mProgressView.setVisibility(GONE);//隐藏动画
                mArrowView.animate().rotation(0);//还原箭头方向
                break;
            case Refreshing:
                mHeaderText.setText("正在刷新");
                mProgressView.setVisibility(VISIBLE);//显示加载动画
                mArrowView.setVisibility(GONE);//隐藏箭头
                break;
            case ReleaseToRefresh:
                mHeaderText.setText("释放立即刷新");
                mArrowView.animate().rotation(180);//显示箭头改为朝上
                break;
        }
    }

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

    }

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