Android définit une image comme fond d'écran

Question

Veuillez me montrer un exemple de code sur la façon de définir une image comme fond d'écran en utilisant Android WallpaperManager. J'ai raccourci et modifié ma question. J'espère que vous pourrez comprendre ma question. Je vais vous montrer quelques tentatives que j'ai faites.

HomeActivity.class

public class HomeActivity extends BaseActivity {

    String[] imageUrls;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.ac_home);
        ArrayList<String> url = new ArrayList<String>();
        try {
            URL url_link = new URL("http://mywebsite.net/web/thumb.xml");
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            DocumentBuilder db = dbf.newDocumentBuilder();
            Document doc = db.parse(new InputSource(url_link.openStream()));
            doc.getDocumentElement().normalize();
            NodeList nodeList = doc.getElementsByTagName("list");

            for (int i = 0; i < nodeList.getLength(); i++) {
                Node node = nodeList.item(i);

                Element fstElmnt = (Element)node;
                NodeList nameList = fstElmnt.getElementsByTagName("thumb_url");
                Element nameElement = (Element)nameList.item(0);
                nameList = nameElement.getChildNodes();

                url.add(nameList.item(0).getNodeValue());
            }
            imageUrls = (String[]) url.toArray(new String[0]);
        } catch (Exception e) {
            System.out.println("XML Pasing Excpetion = " + e);
        }

    }
    public void onImageGridClick(View view) {
        Intent intent = new Intent(this, ImageGridActivity.class);
        intent.putExtra(Extra.IMAGES, imageUrls); 
        startActivity(intent);
    }

    public void onImagePagerClick(View view) {
        Intent intent = new Intent(this, ImagePagerActivity.class);
        intent.putExtra(Extra.IMAGES, imageUrls);
        startActivity(intent);
    }
}

ImagePagerActivity.class

package com.nostra13.example.universalimageloader;

import java.io.IOException;

import android.app.WallpaperManager;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.Toast;

import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.assist.FailReason;
import com.nostra13.universalimageloader.core.assist.ImageLoadingListener;
import com.nostra13.universalimageloader.core.assist.ImageScaleType;

public class ImagePagerActivity extends BaseActivity {

    private ViewPager pager;

    private DisplayImageOptions options;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.ac_image_pager);
        Bundle bundle = getIntent().getExtras();
        String[] imageUrls = bundle.getStringArray(Extra.IMAGES);
        int pagerPosition = bundle.getInt(Extra.IMAGE_POSITION, 0);

        options = new DisplayImageOptions.Builder()
            .showImageForEmptyUri(R.drawable.image_for_empty_url)
            .cacheOnDisc()
            .imageScaleType(ImageScaleType.EXACT)
            .build();

        pager = (ViewPager) findViewById(R.id.pager);
        pager.setAdapter(new ImagePagerAdapter(imageUrls));
        pager.setCurrentItem(pagerPosition);
    }

    public void setWallpaper() {

        WallpaperManager myWallpaperManager
         = WallpaperManager.getInstance(getApplicationContext());
        try {
         myWallpaperManager.setResource(R.id.pager); // nothing happened 
        } catch (IOException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
        }

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main_menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.item_clear_memory_cache:
                imageLoader.clearMemoryCache();
                return true;
            case R.id.item_clear_disc_cache:
                setWallpaper();
                return true;
            default:
                return false;
        }
    }

    @Override
    protected void onStop() {
        imageLoader.stop();
        super.onStop();
    }

    private class ImagePagerAdapter extends PagerAdapter {

        private String[] images;
        private LayoutInflater inflater;

        ImagePagerAdapter(String[] images) {
            this.images = images;
            inflater = getLayoutInflater();
        }

        @Override
        public void destroyItem(View container, int position, Object object) {
            ((ViewPager) container).removeView((View) object);
        }

        @Override
        public void finishUpdate(View container) {
        }

        @Override
        public int getCount() {
            return images.length;
        }

        @Override
        public Object instantiateItem(View view, int position) {
            final View imageLayout = inflater.inflate(R.layout.item_pager_image, null);
            final ImageView imageView = (ImageView) imageLayout.findViewById(R.id.image);
            final ProgressBar spinner = (ProgressBar) imageLayout.findViewById(R.id.loading);

            imageLoader.displayImage(images[position], imageView, options, new ImageLoadingListener() {
                public void onLoadingStarted() {
                    spinner.setVisibility(View.VISIBLE);
                }

                public void onLoadingFailed(FailReason failReason) {
                    String message = null;
                    switch (failReason) {
                        case IO_ERROR:
                            message = "Input/Output error";
                            break;
                        case OUT_OF_MEMORY:
                            message = "Out Of Memory error";
                            break;
                        case UNKNOWN:
                            message = "Unknown error";
                            break;
                    }
                    Toast.makeText(ImagePagerActivity.this, message, Toast.LENGTH_SHORT).show();

                    spinner.setVisibility(View.GONE);
                    imageView.setImageResource(android.R.drawable.ic_delete);
                }

                public void onLoadingComplete(Bitmap loadedImage) {
                    spinner.setVisibility(View.GONE);
                    Animation anim = AnimationUtils.loadAnimation(ImagePagerActivity.this, R.anim.fade_in);
                    imageView.setAnimation(anim);
                    anim.start();
                }

                public void onLoadingCancelled() {
                    // Do nothing
                }
            });

            ((ViewPager) view).addView(imageLayout, 0);
            return imageLayout;
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view.equals(object);
        }

        @Override
        public void restoreState(Parcelable state, ClassLoader loader) {
        }

        @Override
        public Parcelable saveState() {
            return null;
        }

        @Override
        public void startUpdate(View container) {
        }
    }

}

1ère tentative (Mon pagerPosition donne l'erreur "pagerPosition cannot be resolved to a variable")

public void setWallpaper(){
             Bitmap bitmap = BitmapFactory.decodeResource(getResources(), pagerPosition);
    try {
         ImagePagerActivity.this.setWallpaper(bitmap);
            } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        }
        Log.d("Gallery Example", "Image setted.");
            }

2ème tentative (Mon pagerPosition donne l'erreur "pagerPosition cannot be resolved to a variable")

public void setWallpaper() {

        try {
            File file = new File("/sdcard/sampleimage");
            Bitmap bitmap = BitmapFactory.decodeResource(getResources(), pagerPosition);
            bitmap.compress(CompressFormat.JPEG, 80, new FileOutputStream(file));
            Context context = this.getBaseContext();
            context.setWallpaper(bitmap);            
            Toast.makeText(getApplicationContext(), "Wallpaper has been set", Toast.LENGTH_SHORT).show();            
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }         
    }

@Override
        public boolean onOptionsItemSelected(MenuItem item) {
            switch (item.getItemId()) {
                case R.id.set_wallpaper:
                    setWallpaper();
                    return true;
                default:
                    return false;
            }
        }

3ème tentative (Mon setResource(R.id.pager) n'obtient pas l'image du viewpager.

public void setWallpaper() {

        WallpaperManager myWallpaperManager
         = WallpaperManager.getInstance(getApplicationContext());
        try {
         myWallpaperManager.setResource(R.id.pager);
        } catch (IOException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
        }

}

Conclusion

Si je place les codes ci-dessous au-dessus de mon onCreate mon projet entier ne fonctionnera pas.

        Bundle bundle = getIntent().getExtras();
        String[] imageUrls = bundle.getStringArray(Extra.IMAGES);
        final int pagerPosition = bundle.getInt(Extra.IMAGE_POSITION, 0);

Answer 1

Essayez le code ci-dessous dans ImagePagerActivity, j'ai testé le code ci-dessous et il fonctionne.

    // fetch bitmap from view
public static Bitmap getBitmapFromView(View view) {
    Bitmap returnedBitmap = Bitmap.createBitmap(view.getWidth(), view
            .getHeight(), Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(returnedBitmap);
    Drawable bgDrawable = view.getBackground();
    if (bgDrawable != null)
        bgDrawable.draw(canvas);
    else
        // if we unable to get background drawable then we will set white color as wallpaper
        canvas.drawColor(Color.WHITE);
    view.draw(canvas);
    return returnedBitmap;
}

public void setWall(int i) {
    WallpaperManager myWallpaperManager = WallpaperManager.getInstance(getApplicationContext());
    try {
        // below line of code will set your current visible pager item to wallpaper
        // first we have to fetch bitmap from visible view and then we can pass it to wallpaper
        myWallpaperManager.setBitmap(getBitmapFromView(pager.getChildAt(1)));

        // below line of code will set input stream data directly to wallpaper
        // myWallpaperManager.setStream(InputStream Data);

        // below line of code will set any image which is in the drawable folder 
        // myWallpaperManager.setResource(R.drawable.icon);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

Il définira la vue de l'élément du pager visible actuel (si c'est une roue de progression ou une image).

Answer 2

Cela pourrait vous aider avec votre méthode d'arrière-plan...

String imagePath = ""; // YOUR PATH HERE
FileInputStream is = new FileInputStream(new File(imagePath));
BufferedInputStream bis = new BufferedInputStream(is);
Bitmap b = BitmapFactory.decodeStream(bis);
Bitmap bitmapToUse = Bitmap.createScaledBitmap(b, parent.getWidth(), parent.getHeight(), true);
b.recycle();

if(!("").equals(imagePath)){
    WallpaperManager wallpaperManager = WallpaperManager.getInstance(this);
    Drawable wallpaperDrawable = wallpaperManager.getDrawable();
    wallpaperManager.setBitmap(bitmapToUse);
}

Cela devrait placer votre fichier sur votre fond d'écran sans problème.

Pouvez-vous être plus précis sur ce dont vous avez besoin pour le "saveImage()" ? À partir de quoi essayez-vous de sauvegarder ? S'agit-il du stockage local ? Ou un site web ? Plus de détails s'il vous plaît.

[Edit] Mise à jour du code pour plus de clarté

[Edit 2] Pour enregistrer des images à partir d'une URL...

File imageFile = new File("image.png"); // This is location AND file name, all i put here was the filename
URL url = new URL("http://www.whatever.com/image.png");

                    Bitmap bmp = BitmapFactory.decodeStream(url.openConnection()
                            .getInputStream());

                    FileOutputStream out = new FileOutputStream(imageFile);
                    bmp.compress(Bitmap.CompressFormat.PNG, 100, out);

[Edit 3]

Le "parent" est soit votre vue parent (généralement la vue de l'activité en cours). Il y a d'autres façons de définir ce paramètre, le parent.width/height est la façon dont vous allez définir la taille de l'image du papier peint.