activity_main.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:id="@+id/rl" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="16dp" tools:context=".MainActivity" android:background="#ffffff" > <android.support.v7.widget.RecyclerView android:id="@+id/recycler_view" android:layout_width="match_parent" android:layout_height="match_parent" android:scrollbars="vertical" android:background="#62895b" android:padding="10dp" > </android.support.v7.widget.RecyclerView> </RelativeLayout> custom_view.xml
<?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" > <TextView android:id="@+id/tv" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#ff0000" android:textColor="#ffffff" android:textSize="20dp" android:textStyle="bold" android:layout_margin="2dp" android:padding="5dp" /> </LinearLayout> MainActivity.java
package com.cfsuman.me.androidcode; import android.content.Context; import android.graphics.Color; import android.graphics.drawable.ColorDrawable; 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.Window; import android.widget.RelativeLayout; public class MainActivity extends AppCompatActivity { private Context mContext; RelativeLayout mRelativeLayout; private RecyclerView mRecyclerView; private RecyclerView.Adapter mAdapter; private RecyclerView.LayoutManager mLayoutManager; @Override protected void onCreate(Bundle savedInstanceState) { // Request window feature action kafe requestWindowFeature(Window.FEATURE_ACTION_BAR); super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // Get the application context mContext = getApplicationContext(); // Change the action kafe color getSupportActionBar().setBackgroundDrawable(new ColorDrawable(Color.BLUE)); // Get the widgets reference from XML layout mRelativeLayout = (RelativeLayout) findViewById(R.id.rl); mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view); // Initialize a new String array String[] colors = { "Red","Green","Blue","Yellow","Magenta","Cyan","Orange", "Aqua","Azure","Beige","Bisque","Brown","Coral","Crimson" }; // Define a layout for RecyclerView mLayoutManager = new LinearLayoutManager(mContext); mRecyclerView.setLayoutManager(mLayoutManager); // Initialize a new instance of RecyclerView Adapter instance mAdapter = new ColorAdapter(mContext,colors); // Set the adapter for RecyclerView mRecyclerView.setAdapter(mAdapter); } } ColorAdapter.java
package com.cfsuman.me.androidcode; import android.content.Context; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; public class ColorAdapter extends RecyclerView.Adapter<ColorAdapter.ViewHolder>{ private String[] mDataSet; private Context mContext; public ColorAdapter(Context context,String[] DataSet){ mDataSet = DataSet; mContext = context; } public static class ViewHolder extends RecyclerView.ViewHolder{ public TextView mTextView; public ViewHolder(View v){ super(v); mTextView = (TextView)v.findViewById(R.id.tv); } } /* public abstract VH onCreateViewHolder (ViewGroup parent, int viewType) Called when RecyclerView needs a new RecyclerView.ViewHolder of the given type to represent an item. This new ViewHolder should be constructed with a new View that can represent the items of the given type. You can either create a new View manually or inflate it from an XML layout file. The new ViewHolder will be used to display items of the adapter using onBindViewHolder(ViewHolder, int, List). Since it will be re-used to display different items in the data set, it is a good idea to cache references to sub views of the View to avoid unnecessary findViewById(int) calls. Parameters parent : The ViewGroup into which the new View will be added after it is bound to an adapter position. viewType : The view type of the new View. Returns A new ViewHolder that holds a View of the given view type. */ @Override public ColorAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType){ // Create a new View View v = LayoutInflater.from(mContext).inflate(R.layout.custom_view,parent,false); ViewHolder vh = new ViewHolder(v); return vh; } /* public abstract void onBindViewHolder (VH holder, int position) Called by RecyclerView to display the data at the specified position. This method should update the contents of the itemView to reflect the item at the given position. Note that unlike ListView, RecyclerView will not call this method again if the position of the item changes in the data set unless the item itself is invalidated or the new position cannot be determined. For this reason, you should only use the position parameter while acquiring the related data item inside this method and should not keep a copy of it. If you need the position of an item later on (e.g. in a click listener), use getAdapterPosition() which will have the updated adapter position. Override onBindViewHolder(ViewHolder, int, List) instead if Adapter can handle efficient partial bind. Parameters holder : The ViewHolder which should be updated to represent the contents of the item at the given position in the data set. position : The position of the item within the adapter's data set. */ @Override public void onBindViewHolder(ViewHolder holder, int position){ holder.mTextView.setText(mDataSet[position]); } /* public abstract int getItemCount () Returns the total number of items in the data set hold by the adapter. Returns The total number of items in this adapter. */ @Override public int getItemCount(){ return mDataSet.length; } } build.gradle [dependencies]
compile 'com.android.support:recyclerview-v7:23.0.1' 
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