SwipeRefreshLayout

简介

官方下刷组件（无上加）

方法

进度条色（默黑）

• 参数int colorResIds

  loadRefresh.setColorSchemeResources(R.color.colorPrimary, R.color.warning_color, R.color.success_sign);

• 参数int colors

  loadRefresh.setColorSchemeColors(ContextCompat.getColor(GdActivity.this,R.color.colorPrimary));

圆背景色（默白）

• 参数int colorRes

  loadRefresh.setProgressBackgroundColorSchemeResource(R.color.colorPrimary);

• 参数int color

  loadRefresh.setProgressBackgroundColorSchemeColor(ContextCompat.getColor(GdActivity.this, R.color.colorPrimary));

透明度

所包ListView/ScrollView/RecyclerView及刷新圈透明度。

loadRefresh.setAlpha(xxx);

刷新

loadRefresh.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
     @Override
     public void onRefresh() {
         toastShort("刷新");
     }
});

可刷否

loadRefresh.setRefreshing(boolean xxx);

禁/开

loadRefresh.setEnabled(boolean xxx);

定制

下刷上加

package widget;

import android.content.Context;
import android.support.v4.widget.SwipeRefreshLayout;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.widget.AbsListView;
import android.widget.ListView;

import com.self.zsp.rd.R;

/**
 * Created on 2018/1/26.
 *
 * @desc load refresh
 */

public class LoadRefresh extends SwipeRefreshLayout implements AbsListView.OnScrollListener {
    private ListView listView;
    private OnLoadListener onLoadListener;
    private View footer;
    /**
     * 滑至最底上拉
     */
    private int touchSlop;
    /**
     * 按下y坐标
     */
    private int yDown;
    /**
     * 抬起y坐标
     */
    private int yUp;
    /**
     * 加状
     */
    public boolean isLoading;
    /**
     * 禁/开
     */
    public boolean enable = true;

    public LoadRefresh(Context context) {
        this(context, null);
    }

    public LoadRefresh(Context context, AttributeSet attrs) {
        super(context, attrs);
        touchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
        footer = LayoutInflater.from(context).inflate(R.layout.lv_footer, null, false);
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);
        if (listView == null) {
            getListView();
        }
    }

    private void getListView() {
        int childCount = getChildCount();
        if (childCount > 0) {
            View childView = getChildAt(0);
            if (childView instanceof ListView) {
                listView = (ListView) childView;
                listView.setOnScrollListener(this);
            }
        }
    }

    /**
     * (non-Javadoc)
     *
     * @param event
     * @return
     * @see android.view.ViewGroup#dispatchTouchEvent(android.view.MotionEvent)
     */
    @Override
    public boolean dispatchTouchEvent(MotionEvent event) {
        final int action = event.getAction();
        switch (action) {
            // 按下
            case MotionEvent.ACTION_DOWN:
                yDown = (int) event.getRawY();
                break;
            // 移动
            case MotionEvent.ACTION_MOVE:
                yUp = (int) event.getRawY();
                break;
            // 抬起
            case MotionEvent.ACTION_UP:
                if (canLoad()) {
                    loadData();
                }
                break;
            default:
                break;
        }
        return super.dispatchTouchEvent(event);
    }

    /**
     * 可加 最底 无加 上拉
     *
     * @return
     */
    private boolean canLoad() {
        return enable && isBottom() && !isLoading && isPullUp();
    }

    /**
     * 最底
     */
    private boolean isBottom() {
        if (listView != null && listView.getAdapter() != null) {
            int index = listView.getAdapter().getCount() - 1;
            if (listView.getLastVisiblePosition() == index) {
                View lVIV = listView.getChildAt(index - listView.getFirstVisiblePosition());
                return (lVIV != null) && (lVIV.getBottom() == listView.getHeight());
            }
        }
        return false;
    }

    /**
     * 上拉
     *
     * @return
     */
    private boolean isPullUp() {
        return (yDown - yUp) >= touchSlop;
    }

    private void loadData() {
        if (onLoadListener != null) {
            setLoading(true);
            onLoadListener.onLoad();
        }
    }

    public void setLoading(boolean loading) {
        isLoading = loading;
        if (isLoading) {
            listView.addFooterView(footer);
        } else {
            listView.removeFooterView(footer);
            yDown = 0;
            yUp = 0;
        }
    }

    public void setOnLoadListener(OnLoadListener loadListener) {
        onLoadListener = loadListener;
    }

    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {

    }

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
        if (canLoad()) {
            loadData();
        }
    }

    public interface OnLoadListener {
        /**
         * 加载
         */
        void onLoad();
    }
}

isBottom()可如下，即View lVIV = listView.getChildAt(index - listView.getFirstVisiblePosition());与View lVIV = listView.getChildAt(listView.getChildCount() - 1);。此时底部，listView.getChildCount()全item项（否滑程见item项），故二均可。否只能View lVIV = listView.getChildAt(index - listView.getFirstVisiblePosition());。

/**
 * 最底
 */
private boolean isBottom() {
    if (listView != null && listView.getAdapter() != null) {
        int index = listView.getAdapter().getCount() - 1;
        if (listView.getLastVisiblePosition() == index) {
            View lVIV = listView.getChildAt(listView.getChildCount() - 1);
            return (lVIV != null) && (lVIV.getBottom() == listView.getHeight());
        }
    }
    return false;
}

方法

• 禁/开

  loadRefresh.enable = xxx;

• 加状

  if (loadRefresh.isLoading) {
      // 执行
  }

使用

布局

<widget.LoadRefresh
    android:id="@+id/loadRefresh"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/background"
        android:divider="@null"
        android:overScrollMode="never"
        android:scrollbars="none" />
</widget.LoadRefresh>

主代码

// loadRefresh
loadRefresh.setColorSchemeResources(R.color.colorPrimary, R.color.warning_color, R.color.success_sign);
loadRefresh.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
    @Override
    public void onRefresh() {
        toastShort("刷新");
    }
});
loadRefresh.setOnLoadListener(new LoadRefresh.OnLoadListener() {
    @Override
    public void onLoad() {
        toastShort("加载");
    }
});