Android開發RecyclerView

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目錄

• 1. RecyclerView
  • 1.1. Add support library
  • 1.2. 將RecyclerView添加到佈局
  • 1.3. 主actiivty中如何調用recycleview對象
  • 1.4. 重寫定義Adapter
• 2. 實例

1. RecyclerView

1.1. Add support library

dependencies { implementation 'com.android.support:recyclerview-v7:28.0.0' }

1.2. 將RecyclerView添加到佈局

此文件命名爲：activity_recycle_demo.xml

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".RecycleDemoActivity"> <LinearLayout android:id="@+id/layout01" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" > <Button android:id="@+id/linearLayout_recycle" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="線性佈局"/> <Button android:id="@+id/grid_recycle" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center" android:text="網格佈局"/> <Button android:id="@+id/staggeredLayout_recycle" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="瀑布佈局"/> </LinearLayout> <android.support.v7.widget.RecyclerView android:id="@+id/my_recycler_view" android:layout_width="match_parent" android:layout_height="match_parent"> </android.support.v7.widget.RecyclerView> </LinearLayout>

1.3. 主actiivty中如何調用recycleview對象

RecycleDemoActivity.java

package com.haoch95.fristapp; 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.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; import android.view.View; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; import java.util.ArrayList; import java.util.List; public class RecycleDemoActivity extends AppCompatActivity { private Button linearBT, gridBT, starBT; private RecyclerView mRecyclerView; private RecycleAdapter mMyAdapter; private RecyclerView.LayoutManager mLayoutManager; private List<String> list; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_recycle_demo); linearBT = (Button)findViewById(R.id.linearLayout_recycle); gridBT = (Button)findViewById(R.id.grid_recycle); starBT = (Button)findViewById(R.id.staggeredLayout_recycle); // RecyclerView的三部曲 01: 獲取RecyclerView對象 mRecyclerView = (RecyclerView)findViewById(R.id.my_recycler_view); initData(); linearBT.setOnClickListener(new ButtonClicked()); gridBT.setOnClickListener(new ButtonClicked()); starBT.setOnClickListener(new ButtonClicked()); // // 添加水平分割線 // mRecyclerView.addItemDecoration(new DividerItemDecoration(this,DividerItemDecoration.VERTICAL)); } private void initData() { list = new ArrayList<>(); for (int i=0;i<20;i++){ list.add("Item" + i); } } class ButtonClicked implements View.OnClickListener { @Override public void onClick(View v) { switch (v.getId()){ case R.id.linearLayout_recycle: mLayoutManager = new LinearLayoutManager(getApplicationContext()); break; case R.id.grid_recycle: mLayoutManager = new GridLayoutManager(getApplicationContext(),4); break; case R.id.staggeredLayout_recycle: //若是傳入 StaggeredGridLayoutManager.VERTICAL則該佈局支持縱向滑動，那麼前面的 4 則指的是 4列。 //若是傳入 StaggeredGridLayoutManager.HORIZONTAL，則該佈局支持橫向滑動，那麼前面的4 則指的是 4行 mLayoutManager = new StaggeredGridLayoutManager(4,StaggeredGridLayoutManager.VERTICAL); break; default: mLayoutManager = new LinearLayoutManager(getApplicationContext()); break; } //RecyclerView的三部曲 02：設置佈局管理器 mRecyclerView.setLayoutManager(mLayoutManager); mRecyclerView.addItemDecoration(new DividerItemDecoration(getApplicationContext(),DividerItemDecoration.VERTICAL)); // RecyclerView的三部曲 03： 添加適配器，適配器須要重寫 mMyAdapter = new RecycleAdapter(list, getApplicationContext()); mRecyclerView.setAdapter(mMyAdapter); //設置Item增長、移除動畫 mRecyclerView.setItemAnimator(new DefaultItemAnimator()); } } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.menu, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.add: mMyAdapter.addData(1); break; case R.id.delete: mMyAdapter.removeData(1); break; } return true; } } 

1.4. 重寫定義Adapter

RecycleAdapter

package com.haoch95.fristapp; 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.TextView; import android.widget.Toast; import java.util.List; import java.util.Random; public class RecycleAdapter extends RecyclerView.Adapter<RecycleAdapter.MyViewHolder> { private List<String> mList; private Context context; public RecycleAdapter(List<String> list, Context context){ this.mList = list; this.context = context; } @Override public int getItemCount() { return mList.size(); } public class MyViewHolder extends RecyclerView.ViewHolder { public TextView mView; public MyViewHolder(@NonNull View itemView) { super(itemView); mView = itemView.findViewById(R.id.text_view); } } //建立ViewHolder //onCreateViewHolder方法建立一個viewHolder，viewholder能夠理解爲一條數據的展現佈局，這裏咱們自定義類LinearViewHolder建立一個只有TextView的item //這裏咱們須要建立每條佈局使用的layout：recycle_item @NonNull @Override public MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) { return new MyViewHolder(LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.recycle_item, viewGroup, false)); } //填充視圖 //onBindViewHolder方法爲item的UI綁定展現數據 @Override public void onBindViewHolder(@NonNull final MyViewHolder holder, final int position) { holder.mView.setText(mList.get(position)); holder.itemView.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View v) { Toast.makeText(context, "點擊子項"+position, Toast.LENGTH_SHORT).show(); } }); } public void addData(int position) { mList.add(position, "Insert One"); notifyItemInserted(position); } public void removeData(int position) { mList.remove(position); notifyItemRemoved(position); } public void clearALL(){ mList.clear(); notifyDataSetChanged(); } } 

2. 實例

本節中的全部代碼已上傳到:https://github.com/haochen95