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.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="2dp" card_view:cardElevation="1dp" > <TextView android:id="@+id/tv" android:layout_width="match_parent" android:layout_height="wrap_content" android:textColor="#000" android:textSize="20dp" android:layout_margin="2dp" android:padding="5dp" android:layout_gravity="center" android:gravity="center" android:fontFamily="sans-serif-condensed" /> </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.RecyclerView; import android.support.v7.widget.StaggeredGridLayoutManager; 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.RED)); // 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" }; /* StaggeredGridLayoutManager A LayoutManager that lays out children in a staggered grid formation. It supports horizontal & vertical layout as well as an ability to layout children in reverse. Staggered grids are likely to have gaps at the edges of the layout. To avoid these gaps, StaggeredGridLayoutManager can offset spans independently or move items between spans. You can control this behavior via setGapStrategy(int). */ /* public StaggeredGridLayoutManager (int spanCount, int orientation) Creates a StaggeredGridLayoutManager with given parameters. Parameters spanCount : If orientation is vertical, spanCount is number of columns. If orientation is horizontal, spanCount is number of rows. orientation : VERTICAL or HORIZONTAL */ // Define a layout for RecyclerView mLayoutManager = new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL); 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.graphics.Color; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import java.util.Random; public class ColorAdapter extends RecyclerView.Adapter<ColorAdapter.ViewHolder>{ private String[] mDataSet; private Context mContext; private Random mRandom = new Random(); 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); } } @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; } @Override public void onBindViewHolder(ViewHolder holder, int position){ holder.mTextView.setText(mDataSet[position]); // Set a random height for TextView holder.mTextView.getLayoutParams().height = getRandomIntInRange(250,75); // Set a random color for TextView background holder.mTextView.setBackgroundColor(getRandomHSVColor()); } @Override public int getItemCount(){ return mDataSet.length; } // Custom method to get a random number between a range protected int getRandomIntInRange(int max, int min){ return mRandom.nextInt((max-min)+min)+min; } // 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; } } 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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