要优雅就要符合 开闭原则,单一职责,当增加新的类型时只能扩展,不能修改源代码。
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每增加一种类型view时需要新增一个ItemViewFactory的直接子类,或者间接子类
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通过调用MultiTypeRecyclerAdapter的setData或appendData控制view显示顺序
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可以通过调用MultiTypeRecyclerAdapter的setTypeMapPolicy为adapter设置类型映射策略,默认使用DefaultTypeMapPolicy
main activity
package com.multitypeitem;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import com.multitypeitem.adapter.ItemViewFactory;
import com.multitypeitem.adapter.MultiTypeRecyclerAdapter;
public class MainActivity extends AppCompatActivity {
RecyclerView mRecyclerView;
MultiTypeRecyclerAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mRecyclerView = (RecyclerView) findViewById(R.id.recycler);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(layoutManager);
RecyclerView.RecycledViewPool recycledViewPool = new RecyclerView.RecycledViewPool();
//设置每种布局最大缓存数量,可以不设置
recycledViewPool.setMaxRecycledViews(0, 15);
recycledViewPool.setMaxRecycledViews(1, 15);
recycledViewPool.setMaxRecycledViews(2, 15);
recycledViewPool.setMaxRecycledViews(3, 15);
recycledViewPool.setMaxRecycledViews(4, 15);
mRecyclerView.setRecycledViewPool(recycledViewPool);
mAdapter = new MultiTypeRecyclerAdapter();
mRecyclerView.setAdapter(mAdapter);
List<ItemViewFactory> data = getData();
mAdapter.setData(data);
findViewById(R.id.but).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mAdapter.setData(getData2());
}
});
}
public List<ItemViewFactory> getData() {
List<ItemViewFactory> data = new ArrayList<>();
for (int i = 0; i < 10; i++) {
data.add(new ItemView1(this, i));
}
for (int i = 0; i < 1; i++) {
data.add(new ItemView2(this, "view2---------- " + i));
}
// for (int i = 0; i < 10; i++) {
// data.add(new ItemView3(this, new Date(2017-1900, 1, 1 + i)));
// }
//
for (int i = 0; i < 8; i++) {
data.add(new ItemView1(this, 800 + i));
}
//
for (int i = 0; i < 2; i++) {
data.add(new ItemView4(this, i));
}
//
// for (int i = 0; i < 50; i++) {
// data.add(new ItemView5(this, "view5//////// " + i));
// }
return data;
}
public List<ItemViewFactory> getData2() {
List<ItemViewFactory> data = new ArrayList<>();
for (int i = 0; i < 3; i++) {
data.add(new ItemView3(this, new Date(2017 - 1900, 1, 1 + i)));
}
for (int i = 0; i < 3; i++) {
data.add(new ItemView2(this, "view2---------- " + i));
}
// for (int i = 0; i < 5; i++) {
// data.add(new ItemView1(this, i));
// }
//
for (int i = 0; i < 2; i++) {
data.add(new ItemView4(this, i));
}
for (int i = 0; i < 5; i++) {
data.add(new ItemView5(this, "view5//////// " + i));
}
for (int i = 0; i < 8; i++) {
data.add(new ItemView1(this, 800 + i));
}
return data;
}
}
各种类型view,其他view类似
package com.multitypeitem;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.multitypeitem.adapter.ItemViewFactory;
import static com.multitypeitem.adapter.MultiTypeRecyclerAdapter.TAG;
/**
* Created by wanjian on 2017/1/12.
*/
public class ItemView1 extends ItemViewFactory<Integer, ItemView1.Item1VH> {
public ItemView1(Context context, Integer data) {
super(context, data);
}
@Override
public Item1VH onCreateViewHolder(Context context, ViewGroup parent) {
Log.d(TAG, "onCreateViewHolder:..... 1");
return new Item1VH(LayoutInflater.from(context).inflate(R.layout.item1, parent, false));
}
@Override
public void onBindViewHolder(Context context, Item1VH holder, final Integer data) {
holder.mTextView.setText(data + "");
Log.w(TAG, "onBindViewHolder: " + data);
holder.mTextView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
refresh(data + 10000);
}
});
}
static class Item1VH extends RecyclerView.ViewHolder {
TextView mTextView;
public Item1VH(View itemView) {
super(itemView);
mTextView = (TextView) itemView.findViewById(R.id.tv);
}
}
}
package com.multitypeitem;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.multitypeitem.adapter.ItemViewFactory;
import com.multitypeitem.adapter.MultiTypeRecyclerAdapter;
/**
* Created by wanjian on 2017/1/12.
*/
public class ItemView2 extends ItemViewFactory<String, ItemView2.Item2VH> {
public ItemView2(Context context, String data) {
super(context, data);
}
@Override
public Item2VH onCreateViewHolder(Context context, ViewGroup parent) {
Log.d(MultiTypeRecyclerAdapter.TAG, "onCreateViewHolder:----------- 2");
return new ItemView2.Item2VH(LayoutInflater.from(context).inflate(R.layout.item2, parent, false));
}
@Override
public void onBindViewHolder(Context context, Item2VH holder, final String data) {
holder.mTextView.setText(data);
holder.mTextView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
refresh("change..." + data);
}
});
}
static class Item2VH extends RecyclerView.ViewHolder {
TextView mTextView;
public Item2VH(View itemView) {
super(itemView);
mTextView = (TextView) itemView.findViewById(R.id.tv);
}
}
}
main布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context="com.multitypeitem.MainActivity">
<Button
android:id="@+id/but"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="ok"/>
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
</android.support.v7.widget.RecyclerView>
</LinearLayout>
item布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="5dp">
<TextView
android:id="@+id/tv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#e1e1e1"
android:textSize="20sp"
android:textColor="#000"
android:padding="10dp"/>
</LinearLayout>
效果图