设置全尺寸的位图以避免缩放

Question

//他同性恋，我有壁纸的应用，它工作正常但不在android 8（oreo），当我点击按钮将位图设置为壁纸时，我发现她设置了缩放，我怎么样可以避免这种变焦？

public class ViewWallpaper extends AppCompatActivity {

    ImageView imageView;
    FloatingActionButton backbtn;

    FloatingActionMenu mainFloating;
    com.github.clans.fab.FloatingActionButton fbShare;

    //Room Database
    CompositeDisposable compositeDisposable;
    RecentRepository recentRepository;


//checking permissions

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode)
        {
            case Common.PERMISSION_REQUEST_CODE:
            {
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
                {
                    AlertDialog dialog = new SpotsDialog(ViewWallpaper.this);
                    dialog.show();
                    dialog.setMessage("Please waiting ....");

                    String filename = UUID.randomUUID().toString()+".png";
                    Picasso.with(getBaseContext())
                            .load(Common.select_background.getImageUrl())
                            .into(new SaveImageHelper(getBaseContext(),
                                    dialog,
                                    getApplicationContext().getContentResolver(),
                                    filename,
                                    "Unty Live wallpaper"));//probleme here
                }
                else
                    Toast.makeText(this,"You need to accept this permission to download images",Toast.LENGTH_SHORT).show();
            }
        }
    }

//Method to set Bitmap as wallpaper

    private Target target = new Target(){
        @Override
        public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
            WallpaperManager wallpaperManager = WallpaperManager.getInstance(getApplicationContext());
            try {
                wallpaperManager.setBitmap(bitmap);
                StyleableToast.makeText(ViewWallpaper.this,"Wallpaper Set Successfully",R.style.SetWallpaper).show();

            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        @Override
        public void onBitmapFailed(Drawable errorDrawable) {
        }

        @Override
        public void onPrepareLoad(Drawable placeHolderDrawable) {
        }
    };


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


        //Init RoomDatabase
        compositeDisposable = new CompositeDisposable();
        LocalDatabase database = LocalDatabase.getInstance(this);
        recentRepository = RecentRepository.getInstance(RecentsDataSource.getInstance(database.recentsDAO()));



        imageView =(ImageView)findViewById(R.id.imageThumb);
        Picasso.with(this)
                .load(Common.select_background.getImageUrl())
                .into(imageView);

        mainFloating =(FloatingActionMenu)findViewById(R.id.menu);
        fbShare = (com.github.clans.fab.FloatingActionButton)findViewById(R.id.fb_share);
        fbShare.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //Create callback
                shareDialog.registerCallback(callbackManager, new FacebookCallback<Sharer.Result>() {
                    @Override
                    public void onSuccess(Sharer.Result result) {
                        Toast.makeText(ViewWallpaper.this, "Share successfull !", Toast.LENGTH_SHORT).show();
                    }

                    @Override
                    public void onCancel() {
                        Toast.makeText(ViewWallpaper.this, "Share Cancelled !", Toast.LENGTH_SHORT).show();
                    }

                    @Override
                    public void onError(FacebookException error) {
                        Toast.makeText(ViewWallpaper.this, ""+error.getMessage(), Toast.LENGTH_SHORT).show();
                    }
                });

                //We will fetch photo from link and convert to bitmap
                Picasso.with(getBaseContext())
                        .load(Common.select_background.getImageUrl())
                        .into(facebookConvertBitmap);
            }
        });


        floatingActionButton = (com.github.clans.fab.FloatingActionButton)findViewById(R.id.fabWallpaper);
        floatingActionButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {               
                Picasso.with(getBaseContext())
                        .load(Common.select_background.getImageUrl())
                        .into(target);
            }
        });


        //View count
        increaseViewCount();
    }

    @Override
    protected void onDestroy() {
        Picasso.with(this).cancelRequest(target);
        compositeDisposable.clear();
        super.onDestroy();

    }


    @Override
    public  boolean onOptionsItemSelected(MenuItem item){
        if(item.getItemId()== android.R.id.home)
            finish(); // to close activity when click back btn
        return super.onOptionsItemSelected(item);
    }
}