RecyclerView瀑布流插入数据和删除数据

最新推荐文章于 2024-08-16 09:20:42 发布

W_FOOD

最新推荐文章于 2024-08-16 09:20:42 发布

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本文链接：https://blog.youkuaiyun.com/W_FOOD/article/details/78222128

本文展示了如何在Android应用中使用RecyclerView实现瀑布流布局，并演示了如何动态地在列表中插入和删除数据。关键步骤包括初始化RecyclerView，设置布局管理器，创建自定义适配器以及监听按钮事件来执行添加和删除操作。

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package com.bwei.mango.receview;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
        private RecyclerView mRecyclerView;
        private List<String> mDatas;
        private HomeAdapter mAdapter;
        private Button add,delete;
        private int count = 0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initData();
        mRecyclerView = (RecyclerView) findViewById(R.id.id_recyclerview);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
        mRecyclerView.setAdapter(mAdapter = new HomeAdapter());
        mRecyclerView.addItemDecoration(new DividerItemDecoration(this,
                DividerItemDecoration.VERTICAL));
        mRecyclerView.setItemAnimator(new DefaultItemAnimator());
        add = (Button) findViewById(R.id.add);
        delete = (Button) findViewById(R.id.delete);
        add.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                add();
            }
        });
        delete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                delete();
            }
        });
    }
    protected void initData()
    {
        mDatas = new ArrayList<String>();
        for (int i = 'A'; i < 'z'; i++)
        {
            mDatas.add("" + (char) i);
        }
    }
    //插入
    public void add(){
        count++;
        mDatas.add(2,"插入"+count);
        mAdapter.notifyItemInserted(2);
        mAdapter.notifyItemRangeChanged(2,mDatas.size()-2);
    }
    //删除
    public void delete(){
        mDatas.remove(2);
        mAdapter.notifyItemRemoved(2);
        mAdapter.notifyItemRangeChanged(0,mDatas.size()-2);
    }

    class HomeAdapter extends RecyclerView.Adapter<HomeAdapter.MyViewHolder>
    {

        @Override
        public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
        {
            MyViewHolder holder = new MyViewHolder(LayoutInflater.from(
                    MainActivity.this).inflate(R.layout.item_home, parent,
                    false));
            return holder;
        }

        @Override
        public void onBindViewHolder(MyViewHolder holder, int position)
        {
            holder.tv.setText(mDatas.get(position));

        }

        @Override
        public int getItemCount()
        {
            return mDatas.size();
        }

        class MyViewHolder extends RecyclerView.ViewHolder
        {

            TextView tv;

            public MyViewHolder(View view)
            {
                super(view);
                tv = (TextView) view.findViewById(R.id.id_num);
            }
        }
    }


}


主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" >
    <LinearLayout
        android:id="@+id/lin"
        android:layout_width="match_parent"
        android:layout_height="50dp">
        <Button
            android:id="@+id/add"
            android:text="添加"
            android:layout_width="wrap_content"
            android:layout_height="50dp" />
        <Button
            android:id="@+id/delete"
            android:text="删除"
            android:layout_width="wrap_content"
            android:layout_height="50dp" />
       
    </LinearLayout>
    <android.support.v7.widget.RecyclerView
        android:layout_below="@+id/lin"
        android:id="@+id/id_recyclerview"
        android:divider="#ffff0000"
        android:dividerHeight="10dp"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</RelativeLayout>


itemXML:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:background="#44ff0000"
    android:layout_height="wrap_content" >

    <TextView
        android:id="@+id/id_num"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:gravity="center"
        android:text="1" />
</FrameLayout>
导入依赖包:
compile 'com.android.support:mediarouter-v7:25.0.0'
compile 'com.android.support:appcompat-v7:25.0.0'
compile 'com.android.support:recyclerview-v7:25.0.0'