使用RecyclerView显示ListView列表遇到的坑：子item设置match_parent,实际宽度没有全屏
解决办法：onCreateViewHolder()方法中mInflater.inflate()要把parent传进去，如：
return new RecyclerViewHolder1(mInflater.inflate(R.layout.recycler_view_item_1, parent, false));而不能像之前使用的
inflate(R.layout.item_view,null);运行效果：
实现步骤：
1，主要界面布局文件activity_main.xml：
<?xml version="1.0" encoding="utf-8"?>
<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" android:background="#eee" tools:context="com.xing.recyclerviewtest.MainActivity">
<android.support.v7.widget.RecyclerView android:id="@+id/recyclerView" android:layout_width="match_parent" android:layout_height="match_parent" />
</RelativeLayout>
2，两个item布局文件 recycler_view_item1.xml recycler_view_item2.xml：
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="8dp" app:cardBackgroundColor="#fff" app:cardCornerRadius="5dp" app:cardElevation="8dp">
<LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical">
<ImageView android:id="@+id/iv_image" android:layout_width="match_parent" android:layout_height="200dp" android:scaleType="centerCrop" android:src="@mipmap/ic_launcher" />
<TextView android:id="@+id/tv_text" android:layout_width="match_parent" android:layout_height="wrap_content" android:minHeight="100dp" android:padding="10dp" android:text="jisuanji" android:textColor="#000" android:textSize="18sp" />
</LinearLayout>
</android.support.v7.widget.CardView><?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="wrap_content" app:cardBackgroundColor="#fff" android:layout_margin="8dp" app:cardCornerRadius="5dp" app:cardElevation="5dp">
<LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical">
<TextView android:id="@+id/tv_text" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:text="jisuanji" android:textColor="#000" android:textSize="18sp" />
</LinearLayout>
</android.support.v7.widget.CardView>3，ActionBar上按钮
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto">
<item android:id="@+id/action_change_recycler_view" android:icon="@drawable/img_menu" android:title="@string/change_recycler_view" app:showAsAction="always">
<menu>
<item android:id="@+id/item_list" android:title="List" />
<item android:id="@+id/item_grid" android:title="Grid" />
<item android:id="@+id/item_stagger" android:title="Stagger" />
</menu>
</item>
</menu>4，编写RecyclerView的Adapter
RecycleViewAdapter.java
package com.xing.recyclerviewtest;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
/** * Created by Administrator on 2016/7/11. */
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private Context mContext;
private LayoutInflater mInflater;
private String[] titles; //显示文本
private int[] resId; //显示图片的资源id
public RecyclerViewAdapter(Context context, String[] titles, int[] resId) {
mContext = context;
mInflater = LayoutInflater.from(context);
this.titles = titles;
this.resId = resId;
}
public enum ItemType {
ITEM1, ITEM2
}
/** * 创建ViewHolder * * @param parent * @param viewType item布局的类型索引 * @return */
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
if (viewType == ItemType.ITEM1.ordinal()) { //创建第一种holder
return new RecyclerViewHolder1(mInflater.inflate(R.layout.recycler_view_item_1, parent, false));
} else if (viewType == ItemType.ITEM2.ordinal()) {
return new RecyclerViewHolder2(mInflater.inflate(R.layout.recycler_view_item_2, parent, false));
}
return null;
}
/** * 绑定数据至holder * * @param holder * @param position */
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
String text = titles[position];
int id = resId[position];
//根据holder的类型不同，显示不同的数据
if (holder instanceof RecyclerViewHolder1) {
((RecyclerViewHolder1) holder).imageView.setImageResource(id);
((RecyclerViewHolder1) holder).textView.setText(text);
} else if (holder instanceof RecyclerViewHolder2) {
((RecyclerViewHolder2) holder).textView.setText(text);
}
}
@Override
public int getItemCount() {
return titles.length;
}
/** * 根据当前的位置索引加载不同的item布局 * * @param position * @return */
@Override
public int getItemViewType(int position) {
int num = position % 2;
if (num == 0) {
return ItemType.ITEM1.ordinal();
} else {
return ItemType.ITEM2.ordinal();
}
}
/** * 第一种item对应的holder */
public static class RecyclerViewHolder1 extends RecyclerView.ViewHolder {
ImageView imageView;
TextView textView;
/** * @param itemView 表示根布局视图 */
public RecyclerViewHolder1(View itemView) {
super(itemView);
imageView = (ImageView) itemView.findViewById(R.id.iv_image);
textView = (TextView) itemView.findViewById(R.id.tv_text);
}
}
/** * 第2种item对应的holder */
public static class RecyclerViewHolder2 extends RecyclerView.ViewHolder {
TextView textView;
/** * @param itemView 表示根布局视图 */
public RecyclerViewHolder2(View itemView) {
super(itemView);
textView = (TextView) itemView.findViewById(R.id.tv_text);
}
}
}
5，MainActivity.java
使用发广播的形式，更换RecyclerView显示形式，主要考虑到更换布局的操作可能不在同一个界面上，例如放在设置界面上。
package com.xing.recyclerviewtest;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity {
private RecyclerView mRecyclerView;
private String[] titles = {"RecyclerView显示不同类型item布局", "打造 Material Desgin 风格 App",
"面向对象程序编程", "一句话解释栈和队列的区别：东西吃多了，吐是栈，拉是队列！", "Android 从入门到放弃",
"餐厅只接受手机支付而“谢绝现金”被认定违法", "Android", "Java程序设计", "数据结构", "Linux从入门到精通"
};
private int[] resId = {R.drawable.p1, R.drawable.p2, R.drawable.p2, R.drawable.p2, R.drawable.p1,
R.drawable.p2, R.drawable.p2, R.drawable.p2, R.drawable.p1, R.drawable.p2, R.drawable.p2,
R.drawable.p2};
private LinearLayoutManager linearLayoutManager;
private RecyclerViewAdapter adapter;
private ChangeLayoutReceiver mReceiver; //用于更改RecyclerView显示的广播接收者
private static final String ACTION_CHANGE_LAYOUT = "com.xing.recylerview.ACTION_CHNAGE_LAYOUT";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
initData();
registerLayoutReceiver();
}
private void initView() {
mRecyclerView = (RecyclerView) findViewById(R.id.recyclerView);
}
private void initData() {
linearLayoutManager = new LinearLayoutManager(this);
linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
adapter = new RecyclerViewAdapter(this, titles, resId);
mRecyclerView.setLayoutManager(linearLayoutManager);
mRecyclerView.setAdapter(adapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
switch (id) {
case R.id.item_list:
changeRecyclerViewLayout(0);
break;
case R.id.item_grid:
changeRecyclerViewLayout(1);
break;
case R.id.item_stagger:
changeRecyclerViewLayout(2);
break;
}
return super.onOptionsItemSelected(item);
}
private void changeRecyclerViewLayout(int index) {
Intent intent = new Intent();
intent.setAction(ACTION_CHANGE_LAYOUT);
switch (index) {
case 0:
intent.putExtra("index", 0);
break;
case 1:
intent.putExtra("index", 1);
break;
case 2:
intent.putExtra("index", 2);
break;
}
sendBroadcast(intent);
}
class ChangeLayoutReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (ACTION_CHANGE_LAYOUT.equals(action)) {
int index = intent.getIntExtra("index", 0);
updateLayoutManger(index);
}
}
}
private void updateLayoutManger(int index) {
switch (index) {
case 0:
mRecyclerView.setLayoutManager(linearLayoutManager);
mRecyclerView.setAdapter(adapter);
break;
case 1:
mRecyclerView.setLayoutManager(new GridLayoutManager(this, 2, GridLayoutManager.VERTICAL, false));
mRecyclerView.setAdapter(adapter);
break;
case 2:
mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL));
mRecyclerView.setAdapter(adapter);
break;
}
}
/** * 在onCreate中注册广播 */
private void registerLayoutReceiver() {
mReceiver = new ChangeLayoutReceiver();
IntentFilter filter = new IntentFilter();
filter.addAction(ACTION_CHANGE_LAYOUT);
registerReceiver(mReceiver, filter);
}
/** * 取消注册广播 */
@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(mReceiver);
}
}
