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="#c2dbfd" > <android.support.v7.widget.RecyclerView android:id="@+id/recycler_view" android:layout_width="match_parent" android:layout_height="match_parent" android:scrollbars="vertical" > </android.support.v7.widget.RecyclerView> </RelativeLayout> custom_view.xml
<?xml version="1.0" encoding="utf-8"?> <android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:card_view="http://schemas.android.com/apk/res-auto" android:id="@+id/card_view" android:layout_width="match_parent" android:layout_height="wrap_content" card_view:cardCornerRadius="4dp" card_view:cardMaxElevation="4dp" card_view:cardElevation="2dp" card_view:contentPadding="5dp" > <LinearLayout android:id="@+id/ll" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="3dp" > <TextView android:id="@+id/tv" android:layout_width="match_parent" android:layout_height="match_parent" android:textColor="#000" android:textSize="25dp" android:textStyle="bold" android:layout_margin="2dp" android:padding="10dp" android:layout_gravity="center" android:gravity="center" /> </LinearLayout> </android.support.v7.widget.CardView> 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.GridLayoutManager; 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 kafetaria requestWindowFeature(Window.FEATURE_ACTION_BAR); super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // Get the application context mContext = getApplicationContext(); // Change the action kafetaria color getSupportActionBar().setBackgroundDrawable( new ColorDrawable(Color.parseColor("#FF677589")) ); // 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[] animals = { "Aardvark", "Albatross", "Alligator", "Alpaca", "Ant", "Anteater", "Antelope", "Ape", "Armadillo", "Donkey", "Baboon", "Badger", "Barracuda", "Bear", "Beaver", "Bee" }; /* GridLayoutManager A RecyclerView.LayoutManager implementations that lays out items in a grid. By default, each item occupies 1 span. You can change it by providing a custom GridLayoutManager.SpanSizeLookup instance via setSpanSizeLookup(SpanSizeLookup). */ /* public GridLayoutManager (Context context, int spanCount) Creates a vertical GridLayoutManager Parameters context : Current context, will be used to access resources. spanCount : The number of columns in the grid */ // Define a layout for RecyclerView mLayoutManager = new GridLayoutManager(mContext,3); mRecyclerView.setLayoutManager(mLayoutManager); // Initialize a new instance of RecyclerView Adapter instance mAdapter = new AnimalsAdapter(mContext,animals); // Set the adapter for RecyclerView mRecyclerView.setAdapter(mAdapter); } } AnimalsAdapter.java
package com.cfsuman.me.androidcode; import android.content.Context; import android.graphics.Color; import android.graphics.EmbossMaskFilter; import android.graphics.drawable.GradientDrawable; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.LinearLayout; import android.widget.TextView; import java.util.Random; public class AnimalsAdapter extends RecyclerView.Adapter<AnimalsAdapter.ViewHolder>{ private String[] mDataSet; private Context mContext; private Random mRandom = new Random(); public AnimalsAdapter(Context context,String[] DataSet){ mDataSet = DataSet; mContext = context; } public static class ViewHolder extends RecyclerView.ViewHolder{ public TextView mTextView; public LinearLayout mLinearLayout; public ViewHolder(View v){ super(v); mTextView = (TextView) v.findViewById(R.id.tv); mLinearLayout = (LinearLayout) v.findViewById(R.id.ll); } } @Override public AnimalsAdapter.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; } @Override public void onBindViewHolder(ViewHolder holder, int position){ holder.mTextView.setText(mDataSet[position]); // Generate a random color int color = getRandomHSVColor(); // Set a random color for TextView background holder.mTextView.setBackgroundColor(getLighterColor(color)); // Set a text color for TextView holder.mTextView.setTextColor(getReverseColor(color)); // Set a gradient background for LinearLayout holder.mLinearLayout.setBackground(getGradientDrawable()); // Emboss the TextView text applyEmbossMaskFilter(holder.mTextView); } @Override public int getItemCount(){ return mDataSet.length; } // Custom method to apply emboss mask filter to TextView protected void applyEmbossMaskFilter(TextView tv){ EmbossMaskFilter embossFilter = new EmbossMaskFilter( new float[]{1f, 5f, 1f}, // direction of the light source 0.8f, // ambient light between 0 to 1 8, // specular highlights 7f // blur before applying lighting ); tv.setLayerType(View.LAYER_TYPE_SOFTWARE,null); tv.getPaint().setMaskFilter(embossFilter); } // Custom method to generate random HSV color protected int getRandomHSVColor(){ // Generate a random hue value between 0 to 360 int hue = mRandom.nextInt(361); // We make the color depth full float saturation = 1.0f; // We make a full bright color float value = 1.0f; // We avoid color transparency int alpha = 255; // Finally, generate the color int color = Color.HSVToColor(alpha, new float[]{hue, saturation, value}); // Return the color return color; } // Custom method to create a GradientDrawable object protected GradientDrawable getGradientDrawable(){ GradientDrawable gradient = new GradientDrawable(); gradient.setGradientType(GradientDrawable.SWEEP_GRADIENT); gradient.setColors(new int[]{getRandomHSVColor(), getRandomHSVColor(),getRandomHSVColor()}); return gradient; } // Custom method to get a darker color protected int getDarkerColor(int color){ float[] hsv = new float[3]; Color.colorToHSV(color, hsv); hsv[2] = 0.8f *hsv[2]; return Color.HSVToColor(hsv); } // Custom method to get a lighter color protected int getLighterColor(int color){ float[] hsv = new float[3]; Color.colorToHSV(color,hsv); hsv[2] = 0.2f + 0.8f * hsv[2]; return Color.HSVToColor(hsv); } // Custom method to get reverse color protected int getReverseColor(int color){ float[] hsv = new float[3]; Color.RGBToHSV( Color.red(color), // Red value Color.green(color), // Green value Color.blue(color), // Blue value hsv ); hsv[0] = (hsv[0] + 180) % 360; return Color.HSVToColor(hsv); } } build.gradle [dependencies]
compile 'com.android.support:recyclerview-v7:23.0.1' compile 'com.android.support:cardview-v7:23.0.1' 
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