<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.belasri.memesapp.MainActivity">
    <EditText
        android:id="@+id/topText"
        android:hint="Texte en haut"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <EditText
        android:id="@+id/bottomText"
        android:hint="Texte en bas"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <Button
        android:id="@+id/addImage"
        android:text="Ajouter une image"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <Button
        android:id="@+id/addText"
        android:text="Ajouter le text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <RelativeLayout
        android:id="@+id/content"
        android:layout_width="match_parent"
        android:layout_height="250dp">
        <ImageView
            android:id="@+id/memeImage"
            android:layout_width="match_parent"
            android:layout_height="250dp" />
        <TextView
            android:id="@+id/memeTopText"
            android:text="meme top text"
            android:textSize="30sp"
            android:textAlignment="center"
            android:textColor="#FFFFFF"
            android:layout_centerHorizontal="true"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            />
        <TextView
            android:id="@+id/memeBottomText"
            android:text="Meme Bottom Text"
            android:textSize="30sp"
            android:textAlignment="center"
            android:textColor="#FFFFFF"
            android:layout_centerHorizontal="true"
            android:layout_alignParentBottom="true"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            />
    </RelativeLayout>
    <Button
        android:id="@+id/saveImage"
        android:text="Enregistrer"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

                                    
                                

                                    
                                        package com.example.belasri.memesapp;

import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class MainActivity extends AppCompatActivity {
    Button add,write,save;
    ImageView imageView;
    TextView topText,bottomText;
    EditText topTextEdit,bottmTextEdit;
    private static final int RESULT_LOAD_IMG = 1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imageView = (ImageView) findViewById(R.id.memeImage);
        add = (Button) findViewById(R.id.addImage);
        write = (Button) findViewById(R.id.addText);
        save = (Button) findViewById(R.id.saveImage);
        topText = (TextView) findViewById(R.id.memeTopText);
        bottomText = (TextView) findViewById(R.id.memeBottomText);
        topTextEdit = (EditText) findViewById(R.id.topText);
        bottmTextEdit = (EditText) findViewById(R.id.bottomText);
        add.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                addImage();
            }
        });
        write.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                writeImage();
            }
        });
        save.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                saveImage();
            }
        });
    }
    private void addImage(){
        Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
        photoPickerIntent.setType("image/*");
        startActivityForResult(photoPickerIntent, RESULT_LOAD_IMG);
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode == RESULT_LOAD_IMG && resultCode == RESULT_OK && null != data){
            if (resultCode == RESULT_OK) {
                try {
                    final Uri imageUri = data.getData();
                    Log.d("data",data.toString());
                    final InputStream imageStream = getContentResolver().openInputStream(imageUri);
                    final Bitmap selectedImage = BitmapFactory.decodeStream(imageStream);
                    imageView.setImageBitmap(selectedImage);
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                    Toast.makeText(MainActivity.this, "Something went wrong", Toast.LENGTH_LONG).show();
                }

            }else {
                Toast.makeText(MainActivity.this, "You haven't picked Image",Toast.LENGTH_LONG).show();
            }
        }
    }
    private void writeImage() {
        topText.setText(topTextEdit.getText().toString());
        bottomText.setText(bottmTextEdit.getText().toString());
        hideKeyboard();
    }
    private void hideKeyboard() {
        InputMethodManager keyboard = (InputMethodManager) getSystemService(INPUT_METHOD_SERVICE);
        keyboard.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(),0);
    }
    private static Bitmap takeScreenShoot(View view){
        view.setDrawingCacheEnabled(true);
        Bitmap bitmap = Bitmap.createBitmap(view.getDrawingCache());
        view.setDrawingCacheEnabled(false);
        return bitmap;
    }
    public void storeImage(Bitmap bitmap,String fileName){
        //access gallery
        String dirpath = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).toString();
        File directory = new File(dirpath);
        //check if directory exists
        if(!directory.exists()){
            directory.mkdir();
        }
        //creating file
        File file = new File(dirpath,fileName);
        try{
            //start writing in file
            FileOutputStream outputStream = null;
            outputStream = new FileOutputStream(file);
            bitmap.compress(Bitmap.CompressFormat.PNG,100,outputStream);
            Log.v("image",fileName);
            outputStream.flush();
            outputStream.close();
            Toast.makeText(MainActivity.this, " Mème enregistré",Toast.LENGTH_LONG).show();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
    private void saveImage() {
        //get view which is relativelayout
        View content = findViewById(R.id.content);
        //get screenshoot
        Bitmap bitmap = takeScreenShoot(content);
        //create filename
        String filename = "meme-"+System.currentTimeMillis()+".png";
        //store image
        storeImage(bitmap,filename);
    }
}

                                    
                                

                                      
                                          <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>