How To Set Wall Paper Progrmatically (Coding) ?

You have changed your wall paper many times but have you think how that application do all this for you. So today in this tutorial I will cover how you can select wallpaper from gallery and then set it as your home screen wall paper.

In this tutorial I am taking picture from gallery and then you can select as your wall paper.
How to get image from gallery in Image View ? OR 
How to Open Gallery for image Selection ?
To make it easy just go through full tutorial and you will also add this feature in your app.

You may like these tutorials

How to change System Settings in Android ?

How to Create Setting Screen in Android ?

Steps

1. Create New Application and give name it what ever you like and Do next. 
1. minSdkVersion="17” 
2. targetSdkVersion="17". 
2. Give activity name
3. Go to xml file and paste the below code.

activity_setwallpaper_demo.xml  

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="?attr/actionBarSize"
    tools:context="com.androprogrammer.tutorials.samples.SetWallpaperDemo">

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:scaleType="center"
        android:padding="@dimen/padding_normal"
        android:src="@mipmap/ic_launcher"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="10dp"/>


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:padding="@dimen/padding_normal"
        android:layout_alignParentBottom="true">


        <Button
            android:id="@+id/bt_imagepicker"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@string/str_opengallary"/>

        <Button
            android:id="@+id/bt_setwallpaper"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@string/str_setwallpaper"/>
    </LinearLayout>

</RelativeLayout>

Above layout file consist of 2 Buttons and Image View so just copy above code and paste in your project xml(Activity layout) file.Now Copy Below code and Paste in your java file.

SetWallpaperDemo.java  

package com.androprogrammer.tutorials.samples;

import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Build;
import android.provider.MediaStore;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.ImageView;

import com.androprogrammer.tutorials.R;
import com.androprogrammer.tutorials.activities.Baseactivity;

import java.io.IOException;

public class SetWallpaperDemo extends Baseactivity implements View.OnClickListener {

    protected View view;

    protected static final int SELECT_PICTURE = 1;
    protected String SelectedimagePath;
    protected Button bt1,bt2;
    protected ImageView iv1;
    protected Bitmap bmp;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setReference();

        setToolbarElevation(7);

        setToolbarSubTittle(this.getClass().getSimpleName());

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    }

    @Override
    public void setReference() {

        view = LayoutInflater.from(this).inflate(R.layout.activity_setwallpaper_demo,container);

        bt1 = (Button) view.findViewById(R.id.bt_imagepicker);
        bt2 = (Button) view.findViewById(R.id.bt_setwallpaper);
        iv1 = (ImageView) view.findViewById(R.id.imageView1);

        bt1.setOnClickListener(this);
        bt2.setOnClickListener(this);
    }

    private String getPath(Uri getImageuri)
    {
        if(getImageuri == null)
        {
            return null;
        }

        String [] Projection = {MediaStore.Images.Media.DATA};
        Cursor cursor = managedQuery(getImageuri, Projection, null, null, null);

        if(cursor != null)
        {
            int c_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            cursor.moveToFirst();
            cursor.getString(c_index);
            cursor.close();
        }

        return getImageuri.getPath();
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        switch (item.getItemId()) {
            // Respond to the action bar's Up/Home button
            case android.R.id.home:
                finish();
                // NavUtils.navigateUpFromSameTask(this);
                // return true;
                break;
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onClick(View v) {

        switch (v.getId())
        {
            case R.id.bt_imagepicker:

                Intent gallery = new Intent();
                gallery.setType("image/*");
                gallery.setAction(Intent.ACTION_GET_CONTENT);
                startActivityForResult(Intent.createChooser(gallery, "Select Picture"),SELECT_PICTURE);

                break;

            case R.id.bt_setwallpaper:

                try {
                    getApplicationContext().setWallpaper(bmp);
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

                break;
        }

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        if (resultCode == RESULT_OK) {
            if (requestCode == SELECT_PICTURE) {
                Uri getImageuri = data.getData();
                SelectedimagePath = getPath(getImageuri);

                if (bmp != null && bmp.isRecycled()) {
                    bmp = null;
                }

                bmp = BitmapFactory.decodeFile(SelectedimagePath);
                iv1.setImageBitmap(bmp);
            }
        }
    }
}

Well see above code and you can see I have used in built media provider for getting image path(absolute path). in order to change wall paper you have to add following permission in your application.

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

Screen Shot

So that’s it now run your app and make sure in emulator you have no images so run it in your own device or any other emulator. I have done it any checked also. But if you have any question or query ask in below comment box.

Keep coding..