On K+, intent out to Wallpaper manager for crop and set wallpaper.

import android.annotation.TargetApi;

import android.app.Activity;

import android.app.WallpaperManager;

import android.content.Intent;

import android.graphics.Point;

import android.net.Uri;

                // fall-through

            }

            case STATE_PHOTO_PICKED: {

                Intent cropAndSetWallpaperIntent;

                if ("KeyLimePie".equals(Build.VERSION.CODENAME)

                        || Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {

                    WallpaperManager wpm = WallpaperManager.getInstance(getApplicationContext());

                    cropAndSetWallpaperIntent = wpm.getCropAndSetWallpaperIntent(mPickedItem);

                } else {

                    int width = getWallpaperDesiredMinimumWidth();

                    int height = getWallpaperDesiredMinimumHeight();

                    Point size = getDefaultDisplaySize(new Point());

                    float spotlightX = (float) size.x / width;

                    float spotlightY = (float) size.y / height;

                Intent request = new Intent(CropActivity.CROP_ACTION)

                    cropAndSetWallpaperIntent = new Intent(CropActivity.CROP_ACTION)

                        .setDataAndType(mPickedItem, IMAGE_TYPE)

                        .addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT)

                        .putExtra(CropExtras.KEY_OUTPUT_X, width)

                        .putExtra(CropExtras.KEY_SCALE, true)

                        .putExtra(CropExtras.KEY_SCALE_UP_IF_NEEDED, true)

                        .putExtra(CropExtras.KEY_SET_AS_WALLPAPER, true);

                startActivity(request);

                }

                startActivity(cropAndSetWallpaperIntent);

                finish();

            }

        }