Saving Image Data In SharedPreferences

Using Android Studio 1.4

It is possible to store image in SharedPreferences byconverting it into Base64 string.

1) Start Up

Follow previous tutorial or download start up project MyProfile3-first-login.zip.

2) Edit Manifest

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.notarazi.myprofile" >

<uses-feature android:name="android.hardware.camera"

android:required="false" />

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

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

<application

android:allowBackup="true"

android:icon="@mipmap/ic_launcher"

android:label="@string/app_name"

android:supportsRtl="true"

android:theme="@style/AppTheme" >

<activity android:name=".MyProfile"

android:configChanges="keyboardHidden|orientation|screenSize">

<intent-filter>

</intent-filter>

</activity>

</application>

</manifest>

Get permission to use Camera and Gallery resource.

Prevent the application from resetting the image view when device orientation changes.

3) Edit Layout

Add a method call (setProfilePhoto) and another Image View (usersavedphoto).

The second Image View (usersavedphoto) is used to check that the image has been successfully encoded/decoded to/from Base64 string.

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

xmlns:app="http://schemas.android.com/apk/res-auto"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

android:paddingBottom="@dimen/activity_vertical_margin"

tools:context=".MyProfile">

<ScrollView 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" >

<LinearLayout

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >

<com.joooonho.SelectableRoundedImageView

android:id="@+id/userphoto"

android:layout_width="120dp"

android:layout_height="120dp"

android:layout_gravity="center"

android:scaleType="centerCrop"

android:src="@drawable/photo"

app:sriv_border_color="#FFCC00"

app:sriv_border_width="2dp"

app:sriv_oval="true" />

<TextView

android:layout_width="match_parent"

android:layout_height="match_parent"

android:layout_marginTop="20dp"

android:text="Personal Profile"/>

<EditText

android:id="@+id/username"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:inputType="text"

android:hint="Name"/>

<EditText

android:id="@+id/userphone"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:inputType="phone"

android:hint="Phone number"/>

<EditText

android:id="@+id/useremail"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:inputType="textEmailAddress"

android:hint="Email"/>

<Button

android:layout_width="match_parent"

android:layout_height="match_parent"

android:text="OK"

android:onClick="setProfilePhoto"

<com.joooonho.SelectableRoundedImageView

android:id="@+id/usersavedphoto"

android:layout_width="20dp"

android:layout_height="20dp"

android:layout_gravity="center"

android:scaleType="centerCrop"

android:src="@android:drawable/ic_menu_gallery"

app:sriv_border_color="#FFCC00"

app:sriv_border_width="2dp"

app:sriv_oval="true" />

</LinearLayout>

</ScrollView>

</RelativeLayout>

4) Edit MainActivity (convert image)

Bind imageview object to imageview ui.

Get bitmap from the imageview object.

Convert bitmap to string

Save string to sharedpreferences

package com.notarazi.myprofile;

import android.content.SharedPreferences;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.util.Base64;

import android.view.View;

import android.widget.EditText;

import android.widget.ImageView;

import java.io.ByteArrayOutputStream;

public class MyProfile extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_my_profile);

checkFirstLogin();

prepareForm();

}

private void prepareForm() {

SharedPreferences preferences = getSharedPreferences("myprefs", MODE_PRIVATE);

EditText etUserName=(EditText)findViewById(R.id.username);

EditText etUserPhone=(EditText)findViewById(R.id.userphone);

EditText etUserEmail=(EditText)findViewById(R.id.useremail);

// If value for key not exist then return second param value - In this case "..."

etUserName.setText(preferences.getString("username", "..."));

etUserPhone.setText(preferences.getString("userphone", "..."));

etUserEmail.setText(preferences.getString("useremail", "..."));

}

private void checkFirstLogin() {

SharedPreferences preferences = getSharedPreferences("myprefs", MODE_PRIVATE);

// If value for key not exist then return second param value - In this case true

if (preferences.getBoolean("firstLogin", true)) {

initProfile();

SharedPreferences.Editor editor = preferences.edit();

editor.putBoolean("firstLogin", false);

editor.commit();

}

private void initProfile() {

SharedPreferences preferences = getSharedPreferences("myprefs", MODE_PRIVATE);

SharedPreferences.Editor editor = preferences.edit();

editor.putString("username","Demo TryTest");

editor.putString("userphone","01234567890");

editor.putString("useremail","demotrytest@gmail.com");

editor.commit();

}

public void setProfilePhoto(View view){

ImageView ivphoto = (ImageView)findViewById(R.id.userphoto);

//code image to string

ivphoto.buildDrawingCache();

Bitmap bitmap = ivphoto.getDrawingCache();

ByteArrayOutputStream stream=new ByteArrayOutputStream();

bitmap.compress(Bitmap.CompressFormat.PNG, 90, stream);

byte[] image=stream.toByteArray();

//System.out.println("byte array:"+image);

//final String img_str = "data:image/png;base64,"+ Base64.encodeToString(image, 0);

//System.out.println("string:"+img_str);

String img_str = Base64.encodeToString(image, 0);

//decode string to image

String base=img_str;

byte[] imageAsBytes = Base64.decode(base.getBytes(), Base64.DEFAULT);

ImageView ivsavedphoto = (ImageView)this.findViewById(R.id.usersavedphoto);

ivsavedphoto.setImageBitmap(BitmapFactory.decodeByteArray(imageAsBytes, 0, imageAsBytes.length)

);

}

5) Edit MainActivity (save image in sharedpreferences)

package com.notarazi.myprofile;

import android.content.SharedPreferences;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.util.Base64;

import android.view.View;

import android.widget.EditText;

import android.widget.ImageView;

import java.io.ByteArrayOutputStream;

public class MyProfile extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_my_profile);

checkFirstLogin();

prepareForm();

}

private void prepareForm() {

SharedPreferences preferences = getSharedPreferences("myprefs", MODE_PRIVATE);

EditText etUserName=(EditText)findViewById(R.id.username);

EditText etUserPhone=(EditText)findViewById(R.id.userphone);

EditText etUserEmail=(EditText)findViewById(R.id.useremail);

// If value for key not exist then return second param value - In this case "..."

etUserName.setText(preferences.getString("username", "..."));

etUserPhone.setText(preferences.getString("userphone", "..."));

etUserEmail.setText(preferences.getString("useremail", "..."));

}

private void checkFirstLogin() {

SharedPreferences preferences = getSharedPreferences("myprefs", MODE_PRIVATE);

// If value for key not exist then return second param value - In this case true

if (preferences.getBoolean("firstLogin", true)) {

initProfile();

SharedPreferences.Editor editor = preferences.edit();

editor.putBoolean("firstLogin", false);

editor.commit();

}

private void initProfile() {

SharedPreferences preferences = getSharedPreferences("myprefs", MODE_PRIVATE);

SharedPreferences.Editor editor = preferences.edit();

editor.putString("username","Demo TryTest");

editor.putString("userphone","01234567890");

editor.putString("useremail","demotrytest@gmail.com");

editor.commit();

}

public void setProfileImage(View view){

ImageView ivphoto = (ImageView)findViewById(R.id.userphoto);

//code image to string

ivphoto.buildDrawingCache();

Bitmap bitmap = ivphoto.getDrawingCache();

ByteArrayOutputStream stream=new ByteArrayOutputStream();

bitmap.compress(Bitmap.CompressFormat.PNG, 90, stream);

byte[] image=stream.toByteArray();

//System.out.println("byte array:"+image);

//final String img_str = "data:image/png;base64,"+ Base64.encodeToString(image, 0);

//System.out.println("string:"+img_str);

String img_str = Base64.encodeToString(image, 0);

//decode string to image

String base=img_str;

byte[] imageAsBytes = Base64.decode(base.getBytes(), Base64.DEFAULT);

ImageView ivsavedphoto = (ImageView)this.findViewById(R.id.usersavedphoto);

ivsavedphoto.setImageBitmap(BitmapFactory.decodeByteArray(imageAsBytes, 0, imageAsBytes.length) );

//save in sharedpreferences

SharedPreferences preferences = getSharedPreferences("myprefs", MODE_PRIVATE);

SharedPreferences.Editor editor = preferences.edit();

editor.putString("userphoto",img_str);

editor.commit();

}

6) Edit MainActivity (initialize Image Views with the stored image)

package com.notarazi.myprofile;

import android.content.SharedPreferences;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.util.Base64;

import android.view.View;

import android.widget.EditText;

import android.widget.ImageView;

import java.io.ByteArrayOutputStream;

public class MyProfile extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_my_profile);

checkFirstLogin();

prepareForm();

}

private void prepareForm() {

SharedPreferences preferences = getSharedPreferences("myprefs", MODE_PRIVATE);

EditText etUserName=(EditText)findViewById(R.id.username);

EditText etUserPhone=(EditText)findViewById(R.id.userphone);

EditText etUserEmail=(EditText)findViewById(R.id.useremail);

ImageView ivUserPhoto=(ImageView) findViewById(R.id.userphoto);

ImageView ivUserSavedPhoto=(ImageView) findViewById(R.id.usersavedphoto);

// If value for key not exist then return second param value - In this case "..."

etUserName.setText(preferences.getString("username", "..."));

etUserPhone.setText(preferences.getString("userphone", "..."));

etUserEmail.setText(preferences.getString("useremail", "..."));

String img_str=preferences.getString("userphoto", "");

if (!img_str.equals("")){

//decode string to image

String base=img_str;

byte[] imageAsBytes = Base64.decode(base.getBytes(), Base64.DEFAULT); ivUserPhoto.setImageBitmap(BitmapFactory.decodeByteArray(imageAsBytes, 0, imageAsBytes.length) ); ivUserSavedPhoto.setImageBitmap(BitmapFactory.decodeByteArray(imageAsBytes, 0, imageAsBytes.length) );

}

private void checkFirstLogin() {

SharedPreferences preferences = getSharedPreferences("myprefs", MODE_PRIVATE);

// If value for key not exist then return second param value - In this case true

if (preferences.getBoolean("firstLogin", true)) {

initProfile();

SharedPreferences.Editor editor = preferences.edit();

editor.putBoolean("firstLogin", false);

editor.commit();

}

private void initProfile() {

SharedPreferences preferences = getSharedPreferences("myprefs", MODE_PRIVATE);

SharedPreferences.Editor editor = preferences.edit();

editor.putString("username","Demo TryTest");

editor.putString("userphone","01234567890");

editor.putString("useremail","demotrytest@gmail.com");

editor.commit();

}

public void setProfileImage(View view){

ImageView ivphoto = (ImageView)findViewById(R.id.userphoto);

//code image to string

ivphoto.buildDrawingCache();

Bitmap bitmap = ivphoto.getDrawingCache();

ByteArrayOutputStream stream=new ByteArrayOutputStream();

bitmap.compress(Bitmap.CompressFormat.PNG, 90, stream);

byte[] image=stream.toByteArray();

//System.out.println("byte array:"+image);

//final String img_str = "data:image/png;base64,"+ Base64.encodeToString(image, 0);

//System.out.println("string:"+img_str);

String img_str = Base64.encodeToString(image, 0);

//decode string to image

String base=img_str;

byte[] imageAsBytes = Base64.decode(base.getBytes(), Base64.DEFAULT);

ImageView ivsavedphoto = (ImageView)this.findViewById(R.id.usersavedphoto);

ivsavedphoto.setImageBitmap(BitmapFactory.decodeByteArray(imageAsBytes, 0, imageAsBytes.length) );

//save in sharedpreferences

SharedPreferences preferences = getSharedPreferences("myprefs", MODE_PRIVATE);

SharedPreferences.Editor editor = preferences.edit();

editor.putString("userphoto",img_str);

editor.commit();

}

OUTCOME.

(If there is a profile photo stored in shared preferences, the small image below the button will display it. Otherwise it will display a gallery icon as in step no.3).

DOWNLOAD

MyProfile4-profile-photo.zip

REFERENCES

http://www.tutorialspoint.com/android/android_shared_preferences.htm

http://kalisandroid.blogspot.my/2014/08/introduction-inandroid-normally-we-send.html

http://androidopentutorials.com/android-sharedpreferences-tutorial-and-example/