How to save image in android gallery

问题

I try to save the image into WathsappIMG but when I go to image gallery android I don't see the image and the image there into the directory can be seen from ES File Explorer

OutputStream output;
       // Find the SD Card path
        File filepath = Environment.getExternalStorageDirectory();

      // Create a new folder in SD Card
     File dir = new File(filepath.getAbsolutePath()
              + "/WhatSappIMG/");
        dir.mkdirs(); 

     // Retrieve the image from the res folder
        BitmapDrawable drawable = (BitmapDrawable) principal.getDrawable();
        Bitmap bitmap1 = drawable.getBitmap();

        // Create a name for the saved image
        File file = new File(dir, "Wallpaper.jpg" );

        try {

            output = new FileOutputStream(file);

            // Compress into png format image from 0% - 100%
            bitmap1.compress(Bitmap.CompressFormat.JPEG, 100, output);
            output.flush();
            output.close();

        }

        catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

回答1:

the gallery don't displaying (necessarily) files from external storage.

this is a common mistake.

the gallery displays images stored on the media store provider

you can use this method to store image file on media store provider:

public static void addImageToGallery(final String filePath, final Context context) {

    ContentValues values = new ContentValues();

    values.put(Images.Media.DATE_TAKEN, System.currentTimeMillis());
    values.put(Images.Media.MIME_TYPE, "image/jpeg");
    values.put(MediaStore.MediaColumns.DATA, filePath);

    context.getContentResolver().insert(Images.Media.EXTERNAL_CONTENT_URI, values);
}

回答2:

here is what you should enter, when you're about to save the picture in the Gallery

MediaStore.Images.Media.insertImage(getContentResolver(), yourBitmap, yourTitle , yourDescription);

That code will add the image at the end of the Gallery. so please, check your Gallery picture, to be sure

回答3:

Try adding this:

MediaStore.Images.Media.insertImage(getContentResolver(), yourBitmap, yourTitle , yourDescription);

Fill in your details for yourBitmap, yourTitle, and yourDescription, or just leave it as "".

回答4:

You need to add a MediaScannerConnection class to your function of saving the image to the gallery. This class scans for new files and folders in gallery connected with your app. Add the following class to scan the newly saved image files or new added image directory to the gallery or download Source Code

        MediaScannerConnection.scanFile(this, new String[]{file.toString()}, null,
                new MediaScannerConnection.OnScanCompletedListener() {
                    public void onScanCompleted(String path, Uri uri) {
                        Log.i("ExternalStorage", "Scanned " + path + ":");
                        Log.i("ExternalStorage", "-> uri=" + uri);
                    }
                });

Read more

回答5:

For Xamarin fellows:

public static void SaveToTheGalley(this string filePath, Context context)
{
    var values = new ContentValues();
    values.Put(MediaStore.Images.Media.InterfaceConsts.DateTaken, Java.Lang.JavaSystem.CurrentTimeMillis());
    values.Put(MediaStore.Images.Media.InterfaceConsts.MimeType, "image/jpeg");
    values.Put(MediaStore.MediaColumns.Data, filePath);
    context.ContentResolver.Insert(MediaStore.Images.Media.ExternalContentUri, values);
}

And don't forget about android.permission.WRITE_EXTERNAL_STORAGE permission.

回答6:

You should change this piece of code-

try {
        output = new FileOutputStream(file);

        // Compress into png format image from 0% - 100%
        bitmap1.compress(Bitmap.CompressFormat.JPEG, 100, output);
        output.flush();
        output.close();
        String url = Images.Media.insertImage(getContentResolver(), bitmap1,
        "Wallpaper.jpg", null);
    }

    catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

来源：https://stackoverflow.com/questions/20859584/how-to-save-image-in-android-gallery