Android学习之RecyclerView
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RecyclerView是android-support-v7-21版本中新增的一个Widget,官方介绍RecyclerView 是 ListView 的升级版本,更加先进和灵活。
开发环境
- IDE: ADT
- SDK: Android L
首先在Android SDK Manager上下载Android Support Repository,
它会在sdk/extras/android目录下生成m2repository目录,
进入RecycleView目录。用解压文件打开recyclerview-v7-21.0.0-rc1.aar文件,将claaes.jar改名后放入lib文件夹。
如果想在ADT中关联源代码,可以在libs下新建文件
recycleview.jar.properties
编辑
src=D:\\adt-bundle-windows-x86_64-20131030\\sdk\\extras\\android\\m2repository\\com\\android\\support\\recyclerview-v7\\21.0.0-rc1\\recyclerview-v7-21.0.0-rc1-sources.jar
右键项目close project,然后open project这样就可以关联源代码了。
创建项目如图
布局文件中使用 RecyclerView
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" > <android.support.v7.widget.RecyclerView android:id="@+id/recyclerView" android:layout_width="match_parent" android:layout_height="match_parent" /></RelativeLayout>
Activity中
package com.leigo.recyclerview;import android.app.Activity;import android.os.Bundle;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;/** * @ClassName RecyclerViewActivity * @Description TODO * @author GaoLei * @date 2014-7-2 */public class RecyclerViewActivity extends Activity {private static final String TAG = RecyclerViewActivity.class.getSimpleName();private RecyclerView mRecyclerView;/** * @Method: onCreate * @Description: TODO * @param savedInstanceState * @see android.app.Activity#onCreate(android.os.Bundle) */@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_recycle_view);mRecyclerView = (RecyclerView) findViewById(R.id.recyclerView);LinearLayoutManager layoutManager = new LinearLayoutManager(this);//layoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);// 设置布局管理器mRecyclerView.setLayoutManager(layoutManager);String[] dataset = new String[100];for (int i = 0; i < dataset.length; i++) {dataset[i] = "item" + i;}RecyclerAdapter mAdapter = new RecyclerAdapter(dataset);mRecyclerView.setAdapter(mAdapter);}}<strong></strong>
Adapter
package com.leigo.recyclerview;import android.support.v7.widget.RecyclerView;import android.support.v7.widget.RecyclerView.Adapter;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;/** * @ClassName RecyclerAdapter * @Description TODO * @author GaoLei * @date 2014-7-2 */public class RecyclerAdapter extends Adapter<RecyclerAdapter.ViewHolder> {private String[] mDataset;/** * @Description: TODO */public RecyclerAdapter(String[] dataset) {mDataset = dataset;}public static class ViewHolder extends RecyclerView.ViewHolder {public TextView mTextView;/** * @Description: TODO * @param itemView */public ViewHolder(View itemView) {super(itemView);mTextView = (TextView) itemView;}}/** * @Method: getItemCount * @Description: TODO * @return * @see android.support.v7.widget.RecyclerView.Adapter#getItemCount() */@Overridepublic int getItemCount() {return mDataset.length;}/** * @Method: onBindViewHolder * @Description: TODO * @param holder * @param position * @see android.support.v7.widget.RecyclerView.Adapter#onBindViewHolder(android.support.v7.widget.RecyclerView.ViewHolder, * int) */@Overridepublic void onBindViewHolder(ViewHolder holder, int position) {holder.mTextView.setText(mDataset[position]);}/** * @Method: onCreateViewHolder * @Description: TODO * @param parent * @param viewType * @return * @see android.support.v7.widget.RecyclerView.Adapter#onCreateViewHolder(android.view.ViewGroup, * int) */@Overridepublic ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {View view = View.inflate(parent.getContext(),android.R.layout.simple_list_item_1, null);ViewHolder holder = new ViewHolder(view);return holder;}}
RecyclerView 的另一个特点是标准化了 ViewHolder, 编写 Adapter 面向的是 ViewHoder 而不在是View 了, 复用的逻辑被封装了, 写起来更加简单。
截图
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