Ich würde dies als Kommentar hinzufügen, da ich keine Zeit habe, wirklich ins Detail zu gehen, aber es ist offensichtlich zu lang. Probieren Sie so etwas aus (ich verwende dies zum Speichern von Bitmaps in der Galerie). Als Anmerkung scheint es, dass Sie nichts anderes tun, als ein Bild zu scannen. Im Moment scheint es, dass Sie die Datei in Ihrem internen Speicher speichern, nicht in Ihrem Telefoninhalt (Galerie).
Angenommen wir dies von ActivityA.class ausgeführt werden, die Aktivität
/**
* Will save our card (currently set as a bitmap) as a jpeg and save it into our devices
* native photo gallery. Unfortunately, the default method for this will add the image to the bottom
* of the gallery by default, that is no good. This more complex method that utilizes Android's
* native methods will allow us to store the bitmap at the top of the gallery by setting it's
* meta data to today's date.
*/
public class SaveBitmapToDevice extends AsyncTask<Bitmap, Void, String>{
private final ShareType type;
public SaveBitmapToDevice(ShareType type){
this.type = type;
}
@Override
protected String doInBackground(Bitmap... cards) {
return insertImageIntoGallery(getContentResolver(), cards[0], getString(R.string.card_gallery_title),
getString(R.string.card_gallery_label));
}
/**
* A copy of the Android internals insertImage method, this method populates the
* meta data with DATE_ADDED and DATE_TAKEN. This fixes a common problem where media
* that is inserted manually gets saved at the end of the gallery (because date is not populated).
* @see android.provider.MediaStore.Images.Media#insertImage(android.content.ContentResolver, Bitmap, String, String).
* If the MediaStore not available, we will redirect the file to our alternative source, the SD card.
*/
public String insertImageIntoGallery(ContentResolver cr, Bitmap source, String title, String description) {
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.TITLE, title);
values.put(MediaStore.Images.Media.DISPLAY_NAME, title);
values.put(MediaStore.Images.Media.DESCRIPTION, description);
values.put(MediaStore.Images.Media.MIME_TYPE, "image/jpeg");
// Add the date meta data to ensure the image is added at the front of the gallery
values.put(MediaStore.Images.Media.DATE_ADDED, System.currentTimeMillis());
values.put(MediaStore.Images.Media.DATE_TAKEN, System.currentTimeMillis());
Uri url = null;
String stringUrl = null; /* value to be returned */
try {
url = cr.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
if (source != null) {
OutputStream imageOut = cr.openOutputStream(url);
try {
source.compress(Bitmap.CompressFormat.JPEG, 50, imageOut);
} finally {
imageOut.close();
}
long id = ContentUris.parseId(url);
// Wait until MINI_KIND thumbnail is generated.
Bitmap miniThumb = MediaStore.Images.Thumbnails.getThumbnail(cr, id, MediaStore.Images.Thumbnails.MINI_KIND, null);
// This is for backward compatibility.
storeThumbnail(cr, miniThumb, id, 50F, 50F, MediaStore.Images.Thumbnails.MICRO_KIND);
} else {
cr.delete(url, null, null);
return storeToAlternateSd(source, title);
// url = null;
}
} catch (Exception e) {
if (url != null) {
cr.delete(url, null, null);
return storeToAlternateSd(source, title);
// url = null;
}
}
savedOnSD = false;
if (url != null) {
stringUrl = url.toString();
}
return stringUrl;
}
/**
* A copy of the Android internals StoreThumbnail method, it used with the insertImage to
* populate the android.provider.MediaStore.Images.Media#insertImage with all the correct
* meta data. The StoreThumbnail method is private so it must be duplicated here.
* @see android.provider.MediaStore.Images.Media (StoreThumbnail private method).
*/
private Bitmap storeThumbnail(
ContentResolver cr,
Bitmap source,
long id,
float width,
float height,
int kind) {
// create the matrix to scale it
Matrix matrix = new Matrix();
float scaleX = width/source.getWidth();
float scaleY = height/source.getHeight();
matrix.setScale(scaleX, scaleY);
Bitmap thumb = Bitmap.createBitmap(source, 0, 0,
source.getWidth(),
source.getHeight(), matrix,
true
);
ContentValues values = new ContentValues(4);
values.put(MediaStore.Images.Thumbnails.KIND,kind);
values.put(MediaStore.Images.Thumbnails.IMAGE_ID,(int)id);
values.put(MediaStore.Images.Thumbnails.HEIGHT,thumb.getHeight());
values.put(MediaStore.Images.Thumbnails.WIDTH,thumb.getWidth());
Uri url = cr.insert(MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, values);
try {
OutputStream thumbOut = cr.openOutputStream(url);
thumb.compress(Bitmap.CompressFormat.JPEG, 100, thumbOut);
thumbOut.close();
return thumb;
} catch (FileNotFoundException ex) {
Log.e("IMAGE_COMPRESSION_ERROR", "File not found");
ex.printStackTrace();
return null;
} catch (IOException ex) {
Log.e("IMAGE_COMPRESSION_ERROR", "IO Exception");
ex.printStackTrace();
return null;
}
}
/**
* If we have issues saving into our MediaStore, save it directly to our SD card. We can then interact with this file
* directly, opposed to pulling from the MediaStore. Again, this is a backup method if things don't work out as we
* would expect (seeing as most devices will have a MediaStore).
*
* @param src
* @param title
* @return - the file's path
*/
private String storeToAlternateSd(Bitmap src, String title){
if(src == null)
return null;
File sdCardDirectory = new File(Environment.getExternalStorageDirectory() + File.separator + "My Cards");
if(!sdCardDirectory.exists())
sdCardDirectory.mkdir();
SimpleDateFormat sdf = new SimpleDateFormat("MM-dd-yyyy - (hh.mm.a)", Locale.US);
File image = new File(sdCardDirectory, title + " -- [" + sdf.format(new Date()) + "].jpg");
try {
FileOutputStream imageOut = new FileOutputStream(image);
src.compress(Bitmap.CompressFormat.JPEG, 100, imageOut);
imageOut.close();
savedOnSD = true;
return image.getAbsolutePath();
} catch (FileNotFoundException ex) {
ex.printStackTrace();
return null;
} catch (IOException ex) {
ex.printStackTrace();
return null;
}
}
@Override
public void onPostExecute(String url){
if(url != null){
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
if(savedOnSD){
File file = new File(url);
if(file.exists())
intent.setDataAndType(Uri.fromFile(file), "image/jpeg");
else
return;
}
else
intent.setDataAndType(Uri.parse(url), "image/jpeg");
ActivityA.this.startActivity(intent);
}
else
Toast.makeText(ActivityA.this, getString(R.string.error_compressing), Toast.LENGTH_SHORT).show();
}
}
Vielen Dank für ein hilfreiches Stück Code. Kann aber nicht herausfinden, was "imageUrl" am Ende ist ... – rommex
Mehr als willkommen.Es sollte nur URL sein.Erarbeitet die Antwort.Schauen Sie sich die Antwort von paramkmiakos unten, es scheint eine endgültige Lösung zu sein. – zgc7009