RecyclerView的基礎使用
RecyclerView的基本功能介紹：
1. 經過setLayoutManager方法能夠設置佈局，幾個子類佈局以下：java
-> LinearLayoutManager(ListView形式的佈局)android
-> GridLayoutManager(GridView形式的佈局)app
-> StaggeredGridLayoutManager(瀑布流形式的佈局，其實本質仍是GridView，只是每一個Item的高度不同)dom
2. 經過addItemDecoration設置Item之間的分割線ide
3. 經過setItemAnimator設置添加，刪除Item時的動畫佈局
本文因爲須要展現ListView，Vertical GridView，Horizontal GridView和Staggered(瀑布流)，因此就不設置Item之間的分割線，直接在XML中設置Item的間距替代。動畫
主界面的佈局(activity_main)：ui
<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" > <LinearLayout android:id="@+id/id_layout_top" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" android:background="@android:color/darker_gray"> <Button android:id="@+id/id_add" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="增長" /> <Button android:id="@+id/id_delete" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="刪除" /> <Button android:id="@+id/id_menu" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="菜單>" /> </LinearLayout> <android.support.v7.widget.RecyclerView android:id="@+id/id_recyclerview" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_below="@id/id_layout_top" /> </RelativeLayout>
Item的佈局文件(item_recyclerview)：this
<?xml version="1.0" encoding="utf-8"?> <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="50dp" android:layout_margin="3dp" android:background="@drawable/selector" > <TextView android:id="@+id/id_num" android:layout_width="70dp" android:layout_height="50dp" android:layout_gravity="center" android:gravity="center" android:text="1" /> </FrameLayout>
主界面Activity：spa
package com.example.testrecyclerview;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.widget.DefaultItemAnimator;
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.View;
import android.widget.Button;
import android.widget.Toast;
import com.example.testrecyclerview.SimpleAdapter.OnItemClickListener;
public class MainActivity extends Activity implements
android.view.View.OnClickListener {
private RecyclerView mRecyclerView;
private List<String> mDatas;
private SimpleAdapter mAdapter;
private StaggeredAdapter mStaggeredAdapter;
private Button mAddBtn;
private Button mDeleteBtn;
private Button mMenuBtn;
private AlertDialog.Builder mBuilder;
private DialogInterface.OnClickListener mListener;
private int mType = 0;
private final int SIMPLE = 0;
private final int STAGGERED = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initData();
initView();
addListener();
// 設置佈局
mRecyclerView.setLayoutManager(new LinearLayoutManager(this,
LinearLayoutManager.VERTICAL, false));
// 設置動畫
mRecyclerView.setItemAnimator(new DefaultItemAnimator());
}
protected void initData() {
mDatas = new ArrayList<String>();
for (int i = 'A'; i < 'z'; i++) {
mDatas.add("" + (char) i);
}
}
private void initView() {
mAddBtn = (Button) findViewById(R.id.id_add);
mDeleteBtn = (Button) findViewById(R.id.id_delete);
mMenuBtn = (Button) findViewById(R.id.id_menu);
mRecyclerView = (RecyclerView) findViewById(R.id.id_recyclerview);
mAdapter = new SimpleAdapter(this, mDatas);
mStaggeredAdapter = new StaggeredAdapter(this, mDatas);
mRecyclerView.setAdapter(mAdapter);
mListener = new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
switch (which) {
case 0: // ListView
mType = SIMPLE;
mRecyclerView.setAdapter(mAdapter);
mRecyclerView.setLayoutManager(new LinearLayoutManager(
MainActivity.this, LinearLayoutManager.VERTICAL,
false));
break;
case 1: // Vertical GridView
mType = SIMPLE;
mRecyclerView.setAdapter(mAdapter);
mRecyclerView
.setLayoutManager(new StaggeredGridLayoutManager(3,
StaggeredGridLayoutManager.VERTICAL));
break;
case 2: // Horizontal GridView
mType = SIMPLE;
mRecyclerView.setAdapter(mAdapter);
mRecyclerView
.setLayoutManager(new StaggeredGridLayoutManager(5,
StaggeredGridLayoutManager.HORIZONTAL));
break;
case 3: // Staggered
mType = STAGGERED;
mRecyclerView.setAdapter(mStaggeredAdapter);
mRecyclerView
.setLayoutManager(new StaggeredGridLayoutManager(3,
StaggeredGridLayoutManager.VERTICAL));
break;
default:
break;
}
}
};
String[] menu = { "ListView", "Vertical GridView",
"Horizontal GridView", "Staggered" };
mBuilder = new AlertDialog.Builder(this).setTitle("Menu").setItems(
menu, mListener);
}
private void addListener() {
mAddBtn.setOnClickListener(this);
mDeleteBtn.setOnClickListener(this);
mMenuBtn.setOnClickListener(this);
mAdapter.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemLongClick(View view, int position) {
mAdapter.deleteItem(position);
Toast.makeText(MainActivity.this, "long click:" + position,
Toast.LENGTH_SHORT).show();
}
@Override
public void onItemClick(View view, int position) {
Toast.makeText(MainActivity.this, "click:" + position,
Toast.LENGTH_SHORT).show();
}
});
mStaggeredAdapter.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemLongClick(View view, int position) {
mStaggeredAdapter.deleteItem(position);
Toast.makeText(MainActivity.this, "long click:" + position,
Toast.LENGTH_SHORT).show();
}
@Override
public void onItemClick(View view, int position) {
Toast.makeText(MainActivity.this, "click:" + position,
Toast.LENGTH_SHORT).show();
}
});
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.id_add:
if (mType == SIMPLE) {
mAdapter.addItem(1);
} else {
mStaggeredAdapter.addItem(1);
}
break;
case R.id.id_delete:
if (mType == SIMPLE) {
mAdapter.deleteItem(1);
} else {
mStaggeredAdapter.deleteItem(1);
}
break;
case R.id.id_menu:
mBuilder.show();
break;
default:
break;
}
}
}
代碼中有兩個Adapter，分別是SimpleAdapter和StaggeredAdapter，後一個Adapter主要是給瀑布流佈局使用，由於其item的高度是隨機的。
SimpleAdapter繼承RecyclerView中的內置Adapter, 而且RecyclerView中強制用戶使用ViewHolder，用戶須要寫一個RecyclerView中的ViewHolder：
package com.example.testrecyclerview;
import java.util.ArrayList;
import java.util.List;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.RecyclerView.ViewHolder;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnLongClickListener;
import android.view.ViewGroup;
import android.widget.TextView;
public class SimpleAdapter extends
RecyclerView.Adapter<SimpleAdapter.SimpleViewHolder> {
protected List<String> mList;
protected Context mContext;
protected LayoutInflater mInflater;
protected OnItemClickListener mClickListener;
public SimpleAdapter(Context context, List<String> list){
this.mContext = context;
this.mInflater = LayoutInflater.from(context);
if (list != null){
this.mList = list;
}else {
mList = new ArrayList<String>();
}
}
@Override
public int getItemCount() {
// TODO Auto-generated method stub
return mList.size();
}
@Override
public void onBindViewHolder(final SimpleViewHolder holder, final int position) {
holder.mTextView.setText(mList.get(position));
if (mClickListener != null){
holder.itemView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
int pos = holder.getPosition();
mClickListener.onItemClick(holder.itemView, pos);
}
});
holder.itemView.setOnLongClickListener(new OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
int pos = holder.getPosition();
mClickListener.onItemLongClick(holder.itemView, pos);
return false;
}
});
}
}
@Override
public SimpleViewHolder onCreateViewHolder(ViewGroup parent, int arg1) {
View view = mInflater.inflate(R.layout.item_recyclerview, parent, false);
SimpleViewHolder holder = new SimpleViewHolder(view);
return holder;
}
public void addItem(int position){
mList.add(position, "Insert one");
notifyItemInserted(position);
}
public void deleteItem(int position){
mList.remove(position);
notifyItemRemoved(position);
}
public void setOnItemClickListener(OnItemClickListener listener){
this.mClickListener = listener;
}
class SimpleViewHolder extends ViewHolder{
TextView mTextView;
public SimpleViewHolder(View view) {
super(view);
mTextView = (TextView) view.findViewById(R.id.id_num);
}
}
public interface OnItemClickListener{
void onItemClick(View view, int position);
void onItemLongClick(View view, int position);
}
}
瀑布流的Adapter，繼承自SimpleAdapter：
package com.example.testrecyclerview;
import java.util.ArrayList;
import java.util.List;
import com.example.testrecyclerview.SimpleAdapter.SimpleViewHolder;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.RecyclerView.ViewHolder;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.view.View.OnLongClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.TextView;
public class StaggeredAdapter extends
SimpleAdapter {
protected List<Integer> mHeights;
public StaggeredAdapter(Context context, List<String> list){
super(context, list);
mHeights = new ArrayList<Integer>();
for (int i=0; i<mList.size(); i++){
mHeights.add((int) (100 + Math.random()*300));
}
}
@Override
public SimpleViewHolder onCreateViewHolder(ViewGroup parent, int arg1) {
View view = mInflater.inflate(R.layout.item_recyclerview, parent, false);
SimpleViewHolder holder = new SimpleViewHolder(view);
return holder;
}
@Override
public void onBindViewHolder(final SimpleViewHolder holder, final int position) {
LayoutParams lp = holder.mTextView.getLayoutParams();
lp.height = mHeights.get(position);
holder.mTextView.setLayoutParams(lp);
holder.mTextView.setText(mList.get(position));
if (mClickListener != null){
holder.itemView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
int pos = holder.getPosition();
mClickListener.onItemClick(holder.itemView, pos);
}
});
holder.itemView.setOnLongClickListener(new OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
int pos = holder.getPosition();
mClickListener.onItemLongClick(holder.itemView, pos);
return false;
}
});
}
}
}
須要注意的是，RecyclerView並無實現點擊事件，這須要咱們本身寫接口並去調用，這一點在Adapter中已經有體現
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