android RecyclerView介面卡實現item+item內部控制元件點選事件
阿新 • • 發佈:2019-01-09
@先看看效果是不是自己想要的吧@
Adapter:自定義一個繼承RecyclerView.Adapter的介面卡,作用:將資料與每一個item繫結
LayoutManager:佈局管理器,確定每一個item的擺放形式,展示和隱藏
a: LinearLayoutManager :垂直或水平滾動列表樣式顯示Item
b:GridLayoutManager :網格樣式
c:StaggeredGridLayoutManager: 分散交錯寬高不等的格子-->瀑布流的效果
使用步驟:
第一步:新增RecyclerView介面卡依賴
compile 'com.android.support:recyclerview-v7:27.1.1'
第二步:佈局檔案裡使用RecyclerView
第三步:和listView一樣建立item子佈局填充item內容
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="60dp" android:background="#fff"> <ImageView android:id="@+id/iv_icon" android:layout_width="40dp" android:layout_height="40dp" android:layout_centerVertical="true" android:layout_marginLeft="10dp" android:src="@mipmap/ic_launcher"/> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10dp" android:orientation="vertical" android:layout_centerVertical="true" android:layout_toRightOf="@+id/iv_icon"> <TextView android:id="@+id/tv_username" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="username" /> <TextView android:id="@+id/tv_message" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="5dp" android:text="讓我們成為好友吧?" /> </LinearLayout> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:orientation="horizontal" android:paddingRight="5dp" android:layout_centerVertical="true"> <Button android:id="@+id/btn_agree" android:layout_width="60dp" android:layout_height="40dp" android:text="同意" android:textSize="10dp"/> <Button android:id="@+id/btn_refuse" android:layout_width="60dp" android:layout_height="40dp" android:text="拒絕" android:textSize="10dp"/> </LinearLayout> </RelativeLayout>
第四步:定義一個實體類Data,作為Recyclerview的適配型別
第五步:建立自定義MyRecyclerViewAdapter介面卡繼承RecyclerView.Adapter
package com.ied.recyclerview.adapter; import android.content.Context; import android.support.annotation.NonNull; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.Button; import android.widget.ImageView; import android.widget.TextView; import com.ied.recyclerview.R; import com.ied.recyclerview.entity.Data; import java.util.List; public class MyRecyclerViewAdapter extends RecyclerView.Adapter<MyRecyclerViewAdapter.MyViewHolder> implements View.OnClickListener{ private List<Data> list;//資料來源 private Context context;//上下文 public MyRecyclerViewAdapter(List<Data> list, Context context) { this.list = list; this.context = context; } @NonNull @Override public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item,parent,false); return new MyViewHolder(view); } //繫結 @Override public void onBindViewHolder(@NonNull MyViewHolder holder, int position) { Data data = list.get(position); holder.ivIcon.setBackgroundResource(data.getIcon()); holder.tvUsername.setText(data.getUsername()); holder.tvMessage.setText(data.getMessage()); holder.itemView.setTag(position); holder.btnAgree.setTag(position); holder.btnRefuse.setTag(position); } //有多少個item? @Override public int getItemCount() { return list.size(); } //建立MyViewHolder繼承RecyclerView.ViewHolder public class MyViewHolder extends RecyclerView.ViewHolder{ private ImageView ivIcon; private TextView tvUsername,tvMessage; private Button btnAgree,btnRefuse; public MyViewHolder(View itemView) { super(itemView); ivIcon = itemView.findViewById(R.id.iv_icon); tvUsername = itemView.findViewById(R.id.tv_username); tvMessage = itemView.findViewById(R.id.tv_message); btnAgree = itemView.findViewById(R.id.btn_agree); btnRefuse = itemView.findViewById(R.id.btn_refuse); // 為ItemView新增點選事件 itemView.setOnClickListener(MyRecyclerViewAdapter.this); btnAgree.setOnClickListener(MyRecyclerViewAdapter.this); btnRefuse.setOnClickListener(MyRecyclerViewAdapter.this); } } //=======================以下為item中的button控制元件點選事件處理=================================== //item裡面有多個控制元件可以點選(item+item內部控制元件) public enum ViewName { ITEM, PRACTISE } //自定義一個回撥介面來實現Click和LongClick事件 public interface OnItemClickListener { void onItemClick(View v, ViewName viewName, int position); void onItemLongClick(View v); } private OnItemClickListener mOnItemClickListener;//宣告自定義的介面 //定義方法並傳給外面的使用者 public void setOnItemClickListener(OnItemClickListener listener) { this.mOnItemClickListener = listener; } @Override public void onClick(View v) { int position = (int) v.getTag(); //getTag()獲取資料 if (mOnItemClickListener != null) { switch (v.getId()){ case R.id.rv_recyclerView: mOnItemClickListener.onItemClick(v, ViewName.PRACTISE, position); break; default: mOnItemClickListener.onItemClick(v, ViewName.ITEM, position); break; } } } }
第六步:在MainActivity中編寫,初始化資料,設定介面卡
package com.ied.recyclerview;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.Toast;
import com.ied.recyclerview.adapter.MyRecyclerViewAdapter;
import com.ied.recyclerview.entity.Data;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private RecyclerView rvRecyclerView;
private MyRecyclerViewAdapter adapter;
private List<Data> list;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
initData();
rvRecyclerView.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false));//控制佈局為LinearLayout或者是GridView或者是瀑布流佈局
adapter = new MyRecyclerViewAdapter(list,this);
rvRecyclerView.setAdapter(adapter);
// 設定item及item中控制元件的點選事件
adapter.setOnItemClickListener(MyItemClickListener);
}
private void initView() {
rvRecyclerView = (RecyclerView) findViewById(R.id.rv_recyclerView);
}
private void initData() {
list = new ArrayList<>();
list.add(new Data(R.mipmap.ic_launcher, "username", "讓我們成為好友吧!"));
list.add(new Data(R.mipmap.ic_launcher, "username", "讓我們成為好友吧!"));
list.add(new Data(R.mipmap.ic_launcher, "username", "讓我們成為好友吧!"));
list.add(new Data(R.mipmap.ic_launcher, "username", "讓我們成為好友吧!"));
list.add(new Data(R.mipmap.ic_launcher, "username", "讓我們成為好友吧!"));
}
/**
* item+item裡的控制元件點選監聽事件
*/
private MyRecyclerViewAdapter.OnItemClickListener MyItemClickListener = new MyRecyclerViewAdapter.OnItemClickListener() {
@Override
public void onItemClick(View v, MyRecyclerViewAdapter.ViewName viewName, int position) {
//viewName可區分item及item內部控制元件
switch (v.getId()){
case R.id.btn_agree:
Toast.makeText(MainActivity.this,"你點選了同意按鈕"+(position+1),Toast.LENGTH_SHORT).show();
break;
case R.id.btn_refuse:
Toast.makeText(MainActivity.this,"你點選了拒絕按鈕"+(position+1),Toast.LENGTH_SHORT).show();
break;
default:
Toast.makeText(MainActivity.this,"你點選了item按鈕"+(position+1),Toast.LENGTH_SHORT).show();
break;
}
}
@Override
public void onItemLongClick(View v) {
}
};
}
最後成功實現item的點選事件以及item裡控制元件的點選事件!!
(附加:原始碼已實現item+item內部控制元件點選事件+橫向滑動刪除+拖拉移動item位置)