Firebase RecyclerView: Retrieve Images & Text, Implement SearchView, Handle Item Clicks

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In this tutorial we will learn using Firebase in Android app using Android Studio. We will:
✓Create Android Studio Project
✓Create Firebase Project and connect our Android Studio Project to that Firebase Project
✓Store Images to FirebaseStorage manually
✓Add data in FirebaseDatabase
✓Retrieve these data(Title, Image, Description) in RecyclerView. To retrieve Images we will use Picasso library.
✓Implement SearchView
✓Handle RecyclerView Item Clicks, When an item is clicked it will be opened in new Activity.
✓Sort Firebase Data displayed in RecyclerView.
✓Save Image, Share Image & Text, Set Image as Wallpaper

Step 1: Create a new project OR Open your project

Step 2: Choose Empty Activity & name it as "PostsListActivity"

Step 3: Create menu.xml under res>menu folder, to search item.

Step 4: In menu bar click Tools > Firebase. Firebase Assistent will open at right side

Step 5: Scroll and click Realtime Database. Click Save & Retrieve data.

1: Connect your app to Firebase
    Click Connect to Firebase button
    Connect to Firebase window will open. Select Create new Firebase project and enter project name FirebaseProject. Choose country e.g. Pakistan. Click Connect to Firebase button

2: Add the Realtime database to your app
    Click Add the Realtime database to your app button
    Click Accept Changes button

Step 6: Open Firebase

Link: https://console.firebase.google.com
Step 6.1 Click Storage from menu
Click Files tab
Click Upload file and upload some images
Click Rules tab
Define Rules as follows:
service firebase.storage {
  match /b/{bucket}/o {
    match /{allPaths=**} {
      allow read, write: if true;
    }
  }
}

Step 6.2 Click Database from menu
Click Data tab
Note: To get URL of image click the uploaded image, under File location click Download Url, it will be copied
Add data as follows in Data tab of Database.


Step 7: build.gradle(Module app):

apply plugin: 'com.android.application'

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.blogspot.atifsoftwares.firebaseproject"
        minSdkVersion 16
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:27.1.1'
    //card view
    implementation 'com.android.support:cardview-v7:27.1.1'
    //recyclerView
    implementation 'com.android.support:recyclerview-v7:27.1.1'
    //picasso library to retrive images
    implementation 'com.squareup.picasso:picasso:2.71828'

    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
    implementation 'com.google.firebase:firebase-database:11.8.0'
    implementation 'com.firebaseui:firebase-ui-database:0.4.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

apply plugin: 'com.google.gms.google-services'

Step 8: Create class Model.java

package com.blogspot.atifsoftwares.firebaseproject;

public class Model {

    String title, image, description;

    //constructor
    public Model(){}

    //getter and setters press Alt+Insert

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getImage() {
        return image;
    }

    public void setImage(String image) {
        this.image = image;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }
}

Step 9: Create class ViewHolder.java

package com.blogspot.atifsoftwares.firebaseproject;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

import com.squareup.picasso.Picasso;

public class ViewHolder extends RecyclerView.ViewHolder {

    View mView;

    public ViewHolder(View itemView) {
        super(itemView);

        mView = itemView;

        //item click
        itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mClickListener.onItemClick(view, getAdapterPosition());
            }
        });
        //item long click
        itemView.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View view) {
                mClickListener.onItemLongClick(view, getAdapterPosition());
                return true;
            }
        });

    }

    //set details to recycler view row
    public void setDetails(Context ctx, String title, String description, String image){
        //Views
        TextView mTitleTv = mView.findViewById(R.id.rTitleTv);
        TextView mDetailTv = mView.findViewById(R.id.rDescriptionTv);
        ImageView mImageIv = mView.findViewById(R.id.rImageView);
        //set data to views
        mTitleTv.setText(title);
        mDetailTv.setText(description);
        Picasso.get().load(image).into(mImageIv);
    }

    private ViewHolder.ClickListener mClickListener;

    //interface to send callbacks
    public interface ClickListener{
        void onItemClick(View view, int position);
        void onItemLongClick(View  view, int position);
    }

    public void setOnClickListener(ViewHolder.ClickListener clickListener){
        mClickListener = clickListener;
    }
}

Step 10: menu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
            xmlns:app="http://schemas.android.com/apk/res-auto">

   <item
     android:id="@+id/action_search"
     android:icon="@drawable/ic_action_search"
     android:title="Search"
     app:actionViewClass="android.support.v7.widget.SearchView"
     app:showAsAction="always" />
  <item
    android:id="@+id/action_sort"
    android:title="Sort"
    app:showAsAction="never" />

</menu>.

Step 11: Add new resource layout in res folder and name it as row.xml


<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    app:cardBackgroundColor="#fff"
    app:cardCornerRadius="3dp"
    app:cardElevation="3dp"
    app:contentPadding="5dp"
    app:cardUseCompatPadding="true">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">
        <TextView
            android:id="@+id/rTitleTv"
            android:text="Title"
            android:textColor="#000"
            android:textSize="22sp"
            android:textStyle="bold"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
        <ImageView
            android:id="@+id/rImageView"
            android:layout_width="match_parent"
            android:layout_height="200dp"
            android:scaleType="centerCrop"
            android:adjustViewBounds="true"
            android:background="@drawable/loadingimage"/>
        <TextView
            android:id="@+id/rDescriptionTv"
            android:text="This will be the description of the post"
            android:textSize="20sp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

    </LinearLayout>

</android.support.v7.widget.CardView>

Step 12: activity_posts_list.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"
    tools:context=".PostsListActivity"
    android:orientation="vertical">

    <!--RecyclerView-->
    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</LinearLayout>

Step 13: PostsListActivity.java


package com.blogspot.atifsoftwares.firebaseproject;

import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.support.v4.view.MenuItemCompat;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.SearchView;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.Query;

import java.io.ByteArrayOutputStream;

public class PostsListActivity extends AppCompatActivity {

    LinearLayoutManager mLayoutManager; //for sorting
    SharedPreferences mSharedPref; //for saving sort settings
    RecyclerView mRecyclerView;
    FirebaseDatabase mFirebaseDatabase;
    DatabaseReference mRef;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_posts_list);

        //Actionbar
        ActionBar actionBar = getSupportActionBar();
        //set title
        mSharedPref = getSharedPreferences("SortSettings", MODE_PRIVATE);
        String mSorting = mSharedPref.getString("Sort", "newest"); //where if no settingsis selected newest will be default

        if (mSorting.equals("newest")) {
            mLayoutManager = new LinearLayoutManager(this);
            //this will load the items from bottom means newest first
            mLayoutManager.setReverseLayout(true);
            mLayoutManager.setStackFromEnd(true);
        } else if (mSorting.equals("oldest")) {
            mLayoutManager = new LinearLayoutManager(this);
            //this will load the items from bottom means oldest first
            mLayoutManager.setReverseLayout(false);
            mLayoutManager.setStackFromEnd(false);
        }

        //RecyclerView
        mRecyclerView = findViewById(R.id.recyclerView);
        mRecyclerView.setHasFixedSize(true);

        //set layout as LinearLayout
        mRecyclerView.setLayoutManager(mLayoutManager);

        //send Query to FirebaseDatabase
        mFirebaseDatabase = FirebaseDatabase.getInstance();
        mRef = mFirebaseDatabase.getReference("Data");
    }

    //search data
    private void firebaseSearch(String searchText) {

        //convert string entered in SearchView to lowercase
        String query = searchText.toLowerCase();

        Query firebaseSearchQuery = mRef.orderByChild("search").startAt(query).endAt(query + "\uf8ff");

        FirebaseRecyclerAdapter<Model, ViewHolder> firebaseRecyclerAdapter =
                new FirebaseRecyclerAdapter<Model, ViewHolder>(
                        Model.class,
                        R.layout.row,
                        ViewHolder.class,
                        firebaseSearchQuery
                ) {
                    @Override
                    protected void populateViewHolder(ViewHolder viewHolder, Model model, int position) {
                        viewHolder.setDetails(getApplicationContext(), model.getTitle(), model.getDescription(), model.getImage());
                    }

                    @Override
                    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

                        ViewHolder viewHolder = super.onCreateViewHolder(parent, viewType);

                        viewHolder.setOnClickListener(new ViewHolder.ClickListener() {
                            @Override
                            public void onItemClick(View view, int position) {
                                //Views
                                TextView mTitleTv = view.findViewById(R.id.rTitleTv);
                                TextView mDescTv = view.findViewById(R.id.rDescriptionTv);
                                ImageView mImageView = view.findViewById(R.id.rImageView);
                                //get data from views
                                String mTitle = mTitleTv.getText().toString();
                                String mDesc = mDescTv.getText().toString();
                                Drawable mDrawable = mImageView.getDrawable();
                                Bitmap mBitmap = ((BitmapDrawable) mDrawable).getBitmap();

                                //pass this data to new activity
                                Intent intent = new Intent(view.getContext(), PostDetailActivity.class);
                                ByteArrayOutputStream stream = new ByteArrayOutputStream();
                                mBitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
                                byte[] bytes = stream.toByteArray();
                                intent.putExtra("image", bytes); //put bitmap image as array of bytes
                                intent.putExtra("title", mTitle); // put title
                                intent.putExtra("description", mDesc); //put description
                                startActivity(intent); //start activity

                            }

                            @Override
                            public void onItemLongClick(View view, int position) {
                                //TODO do your own implementaion on long item click
                            }
                        });

                        return viewHolder;
                    }


                };

        //set adapter to recyclerview
        mRecyclerView.setAdapter(firebaseRecyclerAdapter);
    }


    //load data into recycler view onStart
    @Override
    protected void onStart() {
        super.onStart();
        FirebaseRecyclerAdapter<Model, ViewHolder> firebaseRecyclerAdapter =
                new FirebaseRecyclerAdapter<Model, ViewHolder>(
                        Model.class,
                        R.layout.row,
                        ViewHolder.class,
                        mRef
                ) {
                    @Override
                    protected void populateViewHolder(ViewHolder viewHolder, Model model, int position) {
                        viewHolder.setDetails(getApplicationContext(), model.getTitle(), model.getDescription(), model.getImage());
                    }

                    @Override
                    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

                        ViewHolder viewHolder = super.onCreateViewHolder(parent, viewType);

                        viewHolder.setOnClickListener(new ViewHolder.ClickListener() {
                            @Override
                            public void onItemClick(View view, int position) {
                                //Views
                                TextView mTitleTv = view.findViewById(R.id.rTitleTv);
                                TextView mDescTv = view.findViewById(R.id.rDescriptionTv);
                                ImageView mImageView = view.findViewById(R.id.rImageView);
                                //get data from views
                                String mTitle = mTitleTv.getText().toString();
                                String mDesc = mDescTv.getText().toString();
                                Drawable mDrawable = mImageView.getDrawable();
                                Bitmap mBitmap = ((BitmapDrawable) mDrawable).getBitmap();

                                //pass this data to new activity
                                Intent intent = new Intent(view.getContext(), PostDetailActivity.class);
                                ByteArrayOutputStream stream = new ByteArrayOutputStream();
                                mBitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
                                byte[] bytes = stream.toByteArray();
                                intent.putExtra("image", bytes); //put bitmap image as array of bytes
                                intent.putExtra("title", mTitle); // put title
                                intent.putExtra("description", mDesc); //put description
                                startActivity(intent); //start activity


                            }

                            @Override
                            public void onItemLongClick(View view, int position) {
                                //TODO do your own implementaion on long item click
                            }
                        });

                        return viewHolder;
                    }

                };

        //set adapter to recyclerview
        mRecyclerView.setAdapter(firebaseRecyclerAdapter);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        //inflate the menu; this adds items to the action bar if it present
        getMenuInflater().inflate(R.menu.menu, menu);
        MenuItem item = menu.findItem(R.id.action_search);
        SearchView searchView = (SearchView) MenuItemCompat.getActionView(item);
        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String query) {
                firebaseSearch(query);
                return false;
            }

            @Override
            public boolean onQueryTextChange(String newText) {
                //Filter as you type
                firebaseSearch(newText);
                return false;
            }
        });
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();

        //handle other action bar item clicks here
        if (id == R.id.action_sort) {
            //display alert dialog to choose sorting
            showSortDialog();
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    private void showSortDialog() {
        //options to display in dialog
        String[] sortOptions = {" Newest", " Oldest"};
        //create alert dialog
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("Sort by") //set title
                .setIcon(R.drawable.ic_action_sort) //set icon
                .setItems(sortOptions, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // The 'which' argument contains the index position of the selected item
                        // 0 means "Newest" and 1 means "oldest"
                        if (which == 0) {
                            //sort by newest
                            //Edit our shared preferences
                            SharedPreferences.Editor editor = mSharedPref.edit();
                            editor.putString("Sort", "newest"); //where 'Sort' is key & 'newest' is value
                            editor.apply(); // apply/save the value in our shared preferences
                            recreate(); //restart activity to take effect
                        } else if (which == 1) {
                            {
                                //sort by oldest
                                //Edit our shared preferences
                                SharedPreferences.Editor editor = mSharedPref.edit();
                                editor.putString("Sort", "oldest"); //where 'Sort' is key & 'oldest' is value
                                editor.apply(); // apply/save the value in our shared preferences
                                recreate(); //restart activity to take effect
                            }
                        }
                    }
                });
        builder.show();
    }

}

Step 14: Create new Activity(Empty Activity) and name it as PostDetailActivity.java


package com.blogspot.atifsoftwares.firebaseproject;

import android.app.WallpaperManager;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.support.annotation.NonNull;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.Manifest;
import android.widget.Toast;

import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Locale;

public class PostDetailActivity extends AppCompatActivity {

    TextView mTitleTv, mDetailTv;
    ImageView mImageIv;

    Bitmap bitmap;

    Button mSaveBtn, mShareBtn, mWallBtn;

    private static final int WRITE_EXTERNAL_STORAGE_CODE = 1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_post_detail);

        //Action bar
        ActionBar actionBar = getSupportActionBar();
        //Actionbar title
        actionBar.setTitle("Post Detail");
        //set back button in action bar
        actionBar.setDisplayHomeAsUpEnabled(true);
        actionBar.setDisplayShowHomeEnabled(true);

        //initialize views
        mTitleTv = findViewById(R.id.titleTv);
        mDetailTv = findViewById(R.id.descriptionTv);
        mImageIv = findViewById(R.id.imageView);
        mSaveBtn = findViewById(R.id.saveBtn);
        mShareBtn = findViewById(R.id.shareBtn);
        mWallBtn = findViewById(R.id.wallBtn);

        //get data from intent
        byte[] bytes = getIntent().getByteArrayExtra("image");
        String title = getIntent().getStringExtra("title");
        String desc = getIntent().getStringExtra("description");
        Bitmap bmp = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);

        //set data to views
        mTitleTv.setText(title);
        mDetailTv.setText(desc);
        mImageIv.setImageBitmap(bmp);

        //get image from imageview as bitmap
        bitmap = ((BitmapDrawable)mImageIv.getDrawable()).getBitmap();

        //save btn click handle
        mSaveBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //if os is >= marshmallow we need runtime permission to save image
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
                    if (checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) ==
                            PackageManager.PERMISSION_DENIED){
                        String[] permission = {Manifest.permission.WRITE_EXTERNAL_STORAGE};
                        //show popup to grant permission
                        requestPermissions(permission, WRITE_EXTERNAL_STORAGE_CODE);
                    }
                    else {
                        //permission already granted, save image
                        saveImage();
                    }
                }
                else {
                    //System os is < marshmallow, save image
                    saveImage();
                }
            }
        });
        //share btn click handle
        mShareBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                shareImage();
            }
        });
        //set wallpaper btn click handle
        mWallBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setImgWallpaper();
            }
        });

    }

    private void setImgWallpaper() {
        WallpaperManager myWallManager = WallpaperManager.getInstance(getApplicationContext());
        try {
            myWallManager.setBitmap(bitmap);
            Toast.makeText(this, "Wallpaper set...", Toast.LENGTH_SHORT).show();
        }
        catch (Exception e){
            Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();
        }
    }

    private void shareImage() {
        try {
            //get title and description and save in string s
            String s = mTitleTv.getText().toString() + "\n" + mDetailTv.getText().toString();

            File file = new File(getExternalCacheDir(), "sample.png");
            FileOutputStream fOut = new FileOutputStream(file);
            bitmap.compress(Bitmap.CompressFormat.PNG, 100, fOut);
            fOut.flush();
            fOut.close();
            file.setReadable(true,false);
            //intent to share image and text
            Intent intent = new Intent(Intent.ACTION_SEND);
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            intent.putExtra(Intent.EXTRA_TEXT, s); // put the text
            intent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(file));
            intent.setType("image/png");
            startActivity(Intent.createChooser(intent, "Share via"));
        }
        catch (Exception e){
            Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();
        }
    }

    private void saveImage() {
        //time stamp, for image name
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss",
                Locale.getDefault()).format(System.currentTimeMillis());
        //path to external storage
        File path = Environment.getExternalStorageDirectory();
        //create folder named "Firebase"
        File dir = new File(path+"/Firebase/");
        dir.mkdirs();
        //image name
        String imageName = timeStamp + ".PNG";
        File file = new File(dir, imageName);
        OutputStream out;
        try {
            out = new FileOutputStream(file);
            bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
            out.flush();
            out.close();
            Toast.makeText(this, imageName+" saved to"+ dir, Toast.LENGTH_SHORT).show();
        }
        catch (Exception e){
            //failed saving image
            Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();
        }
    }

    //handle onBackPressed(go to previous activity)
    @Override
    public boolean onSupportNavigateUp() {
        onBackPressed();
        return true;
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode){
            case WRITE_EXTERNAL_STORAGE_CODE:{
                //if request code is cancelled the result arrays are empty
                if (grantResults.length > 0 && grantResults[0] ==
                        PackageManager.PERMISSION_GRANTED){
                    //permission is granted, save image
                    saveImage();
                }
                else {
                    //permission denied
                    Toast.makeText(this, "enable permission to save image", Toast.LENGTH_SHORT).show();
                }
            }
        }

    }
}

Step 15: activity_post_detail.xmlStep 16: Run Project


<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.blogspot.atifsoftwares.firebaseproject">

    <!-- add internet permission -->
    <uses-permission android:name="android.permission.INTERNET" />
    <!--External storage permission-->
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <!--Wallpaper permission-->
    <uses-permission android:name="android.permission.SET_WALLPAPER"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".PostsListActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".PostDetailActivity"></activity>
    </application>

</manifest>


<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView 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="wrap_content"
    app:cardBackgroundColor="#fff"
    app:cardCornerRadius="3dp"
    app:cardElevation="3dp"
    app:cardUseCompatPadding="true"
    app:contentPadding="5dp"
    tools:context=".PostDetailActivity">

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

            <TextView
                android:id="@+id/titleTv"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Title"
                android:textColor="#000"
                android:textSize="22sp"
                android:textStyle="bold" />

            <ImageView
                android:id="@+id/imageView"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:adjustViewBounds="true"
                android:background="@drawable/loadingimage"
                android:scaleType="fitXY" />

            <TextView
                android:id="@+id/descriptionTv"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="This will be the description of the post"
                android:textSize="20sp" />

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal">
                <Button
                    android:id="@+id/saveBtn"
                    android:layout_weight="1"
                    android:text="Save"
                    android:drawableLeft="@drawable/ic_action_save"
                    style="@style/Base.Widget.AppCompat.Button.Colored"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content" />
                <Button
                    android:id="@+id/shareBtn"
                    android:layout_weight="1"
                    android:text="Share"
                    android:drawableLeft="@drawable/ic_action_share"
                    style="@style/Base.Widget.AppCompat.Button.Colored"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content" />
                <Button
                    android:id="@+id/wallBtn"
                    android:layout_weight="1"
                    android:text="Wall"
                    android:drawableLeft="@drawable/ic_action_wall"
                    style="@style/Base.Widget.AppCompat.Button.Colored"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content" />
            </LinearLayout>

        </LinearLayout>
    </ScrollView>

</android.support.v7.widget.CardView>

Step 16: AndroidManifest.xml


<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.blogspot.atifsoftwares.firebaseproject">

    <!-- add internet permission -->
    <uses-permission android:name="android.permission.INTERNET" />
    <!--External storage permission-->
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <!--Wallpaper permission-->
    <uses-permission android:name="android.permission.SET_WALLPAPER"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".PostsListActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".PostDetailActivity"></activity>
    </application>

</manifest>

Step 17: Run Project

Output

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