SwipeRefreshLayout+RecyclerView 下拉重新整理
阿新 • • 發佈:2018-11-21
SwipeRefreshLayout 是v4包中的控制元件,
RecyclerView 是v7包中的控制元件,替代了ListView,強制使用ViewHolder。
Demo 地址:https://github.com/SunnyLine/SwipeRefreshAddRecyclerView
Layout
<android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/swipe_refresh_widget"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical" />
</android.support .v4.widget.SwipeRefreshLayout>
MainActivity.class
@@ -0,0 +1,109 @@
package com.swipe.recycler;
import android.content.Context;
import android.graphics.Color;
import android.os.Handler;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.TypedValue;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Random;
public class MainActivity extends AppCompatActivity {
private SwipeRefreshLayout mSwipeRefreshWidget;
private RecyclerView mRecyclerView;
CatNamesRecyclerViewAdapter mAdapter;
private String[] colors = new String[]{"#ff00ddff", "#ff99cc00", "#ffcc0000",
"#ffffbb33", "#ffefefef", "#ff0099cc"
, "#ffff8800", "#ffaa66cc", "#ffff4444"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSwipeRefreshWidget = (SwipeRefreshLayout) findViewById(R.id.swipe_refresh_widget);
mRecyclerView = (RecyclerView) findViewById(R.id.list);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(linearLayoutManager);
mRecyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL_LIST));
mAdapter = new CatNamesRecyclerViewAdapter(this);
mRecyclerView.setAdapter(mAdapter);
mSwipeRefreshWidget.setColorSchemeResources(android.R.color.holo_blue_bright, android.R.color.holo_green_light,
android.R.color.holo_orange_light, android.R.color.holo_purple);
mSwipeRefreshWidget.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
refreshContent();
}
});
}
private void refreshContent() {
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
mAdapter.refreshContent();
mAdapter.notifyDataSetChanged();
mSwipeRefreshWidget.setRefreshing(false);
}
}, 5000);
}
class CatNamesRecyclerViewAdapter extends RecyclerView.Adapter<CatNamesRecyclerViewAdapter.CatNamesViewHolder> {
private Context mContext;
List<String> mCatNames;
public CatNamesRecyclerViewAdapter(Context context) {
mContext = context;
mCatNames = Arrays.asList(mContext.getResources().getStringArray(R.array.day));
Collections.shuffle(mCatNames);
}
public class CatNamesViewHolder extends RecyclerView.ViewHolder {
TextView mCatNameTextView;
public CatNamesViewHolder(View itemView) {
super(itemView);
mCatNameTextView = (TextView) itemView.findViewById(R.id.textView);
}
}
public void refreshContent() {
Collections.shuffle(mCatNames);
}
@Override
public CatNamesViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View inflatedView = LayoutInflater.from(mContext).inflate(R.layout.item, viewGroup, false);
return new CatNamesViewHolder(inflatedView);
}
@Override
public void onBindViewHolder(CatNamesViewHolder viewHolder, int i) {
String catName = mCatNames.get(i);
viewHolder.mCatNameTextView.setText(catName);
viewHolder.mCatNameTextView.setBackgroundColor(Color.parseColor(colors[new Random().nextInt(9)]));
}
@Override
public int getItemCount() {
return mCatNames.size();
}
}
}
DividerItemDecoration.class RecyclerView 設定Divider(此類是從GitHub上 下載的)
@@ -0,0 +1,128 @@
package com.swipe.recycler;
/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;
/**
* This class is from the v7 samples of the Android SDK. It's not by me!
* <p/>
* See the license above for details.
*/
public class DividerItemDecoration extends RecyclerView.ItemDecoration
{
private static final int[] ATTRS = new int[] { android.R.attr.listDivider };
public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;
public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;
private Drawable mDivider;
private int mOrientation;
public DividerItemDecoration(Context context, int orientation)
{
final TypedArray a = context.obtainStyledAttributes(ATTRS);
mDivider = a.getDrawable(0);
a.recycle();
setOrientation(orientation);
}
public void setOrientation(int orientation)
{
if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST)
{
throw new IllegalArgumentException("invalid orientation");
}
mOrientation = orientation;
}
@Override
public void onDraw(Canvas c, RecyclerView parent)
{
Log.v("recyclerview - itemdecoration", "onDraw()");
if (mOrientation == VERTICAL_LIST) {
drawVertical(c, parent);
} else {
drawHorizontal(c, parent);
}
}
public void drawVertical(Canvas c, RecyclerView parent)
{
final int left = parent.getPaddingLeft();
final int right = parent.getWidth() - parent.getPaddingRight();
final int childCount = parent.getChildCount();
for (int i = 0; i < childCount; i++)
{
final View child = parent.getChildAt(i);
RecyclerView v = new RecyclerView(
parent.getContext());
final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
.getLayoutParams();
final int top = child.getBottom() + params.bottomMargin;
final int bottom = top + mDivider.getIntrinsicHeight();
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(c);
}
}
public void drawHorizontal(Canvas c, RecyclerView parent)
{
final int top = parent.getPaddingTop();
final int bottom = parent.getHeight() - parent.getPaddingBottom();
final int childCount = parent.getChildCount();
for (int i = 0; i < childCount; i++)
{
final View child = parent.getChildAt(i);
final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
.getLayoutParams();
final int left = child.getRight() + params.rightMargin;
final int right = left + mDivider.getIntrinsicHeight();
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(c);
}
}
@Override
public void getItemOffsets(Rect outRect, int itemPosition,
RecyclerView parent)
{
if (mOrientation == VERTICAL_LIST)
{
outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
} else
{
outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
}
}
}