通过这篇文章你将学会：
1.RecyclerView的基本用法；
2.SwipeRefreshLayout的基本用法;
3.为RecyclerView的item添加响应事件。
RecyclerView简单说下，它是用来替代传统ListView的，RecyclerView更加灵活，而且可以与动画很好的结合，你可以很方便的为每个item增加各种动画效果，另外，RecyclerView强制使用ViewHolder模式，可以提高性能。
截图：
步骤：
1.添加依赖：
compile ‘com.android.support:recyclerview-v7:21.0.0‘ compile ‘com.android.support:support-v4:22.0.0‘
2.编写activity布局：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.taobao.recyclerviewwithrefresh.ui.activity.GridActivity">
<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/refreshLayout_grid"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerView_grid"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical"
></android.support.v7.widget.RecyclerView>
</android.support.v4.widget.SwipeRefreshLayout>
</RelativeLayout>
3.编写每个item的布局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
xmlns:tools="http://schemas.android.com/tools"
android:layout_height="50dp">
<ImageView
android:src="@mipmap/ic_launcher"
android:padding="5dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView
android:id="@+id/tv"
android:layout_width="wrap_content"
android:textSize="18sp"
android:gravity="center"
android:layout_height="match_parent"
tools:text="ss"/>
</LinearLayout>
4.数据源：
package com.taobao.recyclerviewwithrefresh.data;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Rowandjj on 2015/3/24.
*/
public class DataSource
{
public static final List<String> generateData(int size)
{
if (size <= 0)
return null;
List<String> datas = new ArrayList<>();
for (int i = 0; i < size; i++)
{
datas.add("这是列表数据"+i);
}
return datas;
}
}
5.分隔条：
package com.taobao.recyclerviewwithrefresh.ui.adapter;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.RecyclerView;
import android.view.View;
/**
* Created by Rowandjj on 2015/3/24.
*/
public class MyItemDecoration extends RecyclerView.ItemDecoration
{
private static final int[] ATTRS = {android.R.attr.listDivider};
private Drawable mDivider;
public MyItemDecoration(Context context)
{
TypedArray array = context.obtainStyledAttributes(ATTRS);
// 获取分隔条
mDivider = array.getDrawable(0);
array.recycle();
}
@Override
public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state)
{
super.onDrawOver(c, parent, state);
int count = parent.getChildCount();
int left = parent.getPaddingLeft();
int right = parent.getWidth()-parent.getPaddingRight();
for(int i = 0; i < count; i++)
{
View v = parent.getChildAt(i);
RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) v.getLayoutParams();
int top = v.getBottom() + params.bottomMargin;
int bottom = top + mDivider.getIntrinsicHeight();
mDivider.setBounds(left,top,right,bottom);
mDivider.draw(c);
}
}
}
6.编写数据适配器，并为其增加点击响应事件
package com.taobao.recyclerviewwithrefresh.ui.adapter;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.taobao.recyclerviewwithrefresh.R;
import java.util.List;
/**
* Created by Rowandjj on 2015/3/24.
*
*/
public class MainRecyclerAdapter extends RecyclerView.Adapter<MainRecyclerAdapter.ViewHolder>
{
private List<String> datas = null;
private OnItemClickListener mListener;
public void setOnItemClickListener(OnItemClickListener listener)
{
this.mListener = listener;
}
public MainRecyclerAdapter(List<String> datas)
{
this.datas = datas;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
{
final View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.item, parent, false);
itemView.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
if(mListener != null)
{
mListener.OnItemClick(v, (String) itemView.getTag());
}
}
});
return new ViewHolder(itemView);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position)
{
String s = datas.get(position);
holder.bindData(s);
holder.itemView.setTag(s);
}
@Override
public int getItemCount()
{
return datas.size();
}
/**
* 批量增加
* */
public void addItems(List<String> items)
{
if (items == null)
return;
this.datas.addAll(0, items);
this.notifyItemRangeInserted(0, items.size());
}
public interface OnItemClickListener
{
public void OnItemClick(View view,String data);
}
static class ViewHolder extends RecyclerView.ViewHolder
{
private TextView mContent;
public ViewHolder(View itemView)
{
super(itemView);
mContent = (TextView) itemView.findViewById(R.id.tv);
}
public void bindData(String s)
{
if (s != null)
mContent.setText(s);
}
}
}
RecyclerView没有提供类似onItemClickListener之类的回调，这里我们自己实现了一个。。。
7.主页面代码：
package com.taobao.recyclerviewwithrefresh.ui.activity;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;
import com.taobao.recyclerviewwithrefresh.R;
import com.taobao.recyclerviewwithrefresh.data.DataSource;
import com.taobao.recyclerviewwithrefresh.ui.adapter.MyItemDecoration;
import com.taobao.recyclerviewwithrefresh.ui.adapter.MainRecyclerAdapter;
import java.util.ArrayList;
import java.util.List;
/**
* 1.RecyclerView基本用法
* LayoutManager
* ItemAnimator
* ItemDecoration
*
* RecyclerView.Adapter
* RecyclerView.ViewHolder
*
* 2.SwipeRefreshLayout用法
*
* 3.给RecyclerView的每个item添加响应事件的方式
*
* 4.控制RecyclerView滚动到某一具体位置: RecyclerView#scrollToPosition
*
*
* */
public class MainActivity extends ActionBarActivity implements SwipeRefreshLayout.OnRefreshListener
{
private RecyclerView mRecyclerView;
private SwipeRefreshLayout mRefreshlayout;
private LinearLayoutManager mLinearLayoutManager;
private MainRecyclerAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mRecyclerView = (RecyclerView) findViewById(R.id.recyclerView);
mRefreshlayout = (SwipeRefreshLayout) findViewById(R.id.refreshLayout);
mRefreshlayout.setOnRefreshListener(this);
mLinearLayoutManager = new LinearLayoutManager(this);
mAdapter = new MainRecyclerAdapter(DataSource.generateData(20));
mRecyclerView.setAdapter(mAdapter);
//每个item高度一致，可设置为true，提高性能
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(mLinearLayoutManager);
//分隔线
mRecyclerView.addItemDecoration(new MyItemDecoration(this));
//为每个item增加响应事件
mAdapter.setOnItemClickListener(new MainRecyclerAdapter.OnItemClickListener()
{
@Override
public void OnItemClick(View view, String data)
{
Toast.makeText(MainActivity.this, "data:" + data, Toast.LENGTH_SHORT).show();
}
});
}
@Override
public void onRefresh()
{
new UpdateTask().execute();
}
private class UpdateTask extends AsyncTask<Void,Void,List<String>>
{
@Override
protected List<String> doInBackground(Void... params)
{
try
{
Thread.sleep(2000);
} catch (InterruptedException e)
{
e.printStackTrace();
}
List<String> strings = new ArrayList<>();
strings.add("新数据1");
strings.add("新数据2");
strings.add("新数据3");
strings.add("新数据4");
return strings;
}
@Override
protected void onPostExecute(List<String> strings)
{
mAdapter.addItems(strings);
//通知刷新完毕
mRefreshlayout.setRefreshing(false);
//滚动到列首部--->这是一个很方便的api，可以滑动到指定位置
mRecyclerView.scrollToPosition(0);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_grid)
{
this.startActivity(new Intent(this, GridActivity.class));
return true;
}else if(id == R.id.action_settings)
{
Toast.makeText(MainActivity.this, "run...", Toast.LENGTH_SHORT).show();
return true;
}
return super.onOptionsItemSelected(item);
}
}
时间： 2024-10-13 07:22:09