Android: Saving image to storage

问题

Currently my application, takes a photo, and put's the data into a ImageView.

public void openCamera() {
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
        startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
    }
}

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
        Bundle extras = data.getExtras();
        Bitmap photo = (Bitmap) data.getExtras().get("data");
        imageView.setImageBitmap(photo);
    }
}

Now, i want it to do this: When the user clicks the button 'Save Button' I would like it to save to storage. How would i do this? I have my button set up with an OnClick listener.

public void save_btn() {

}

回答1:

Step #1: Hold onto the Bitmap somewhere

Step #2: When the button is clicked, fork a background thread, AsyncTask, IntentService, etc. to do the work

Step #3: In the background thread (or whatever), call compress() on the Bitmap, providing an OutputStream on whatever file you want to write to

回答2:

use Bitmap compress method to store bitmap into the android data storage. and if you want to store full size of image then please use intent.putExtra with file uri or even you can create your own content Provider (Which is my fav).

bmp.compress(Bitmap.CompressFormat.PNG, 85, fOut);

http://developer.android.com/training/camera/photobasics.html#TaskPath

takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile));

回答3:

Try this:

String filename = "somename.jpg"; // your filename with path to sdcard
File file = new File(filename);
OutputStream outStream = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outStream); // your bitmap
outStream.flush();
outStream.close();

回答4:

Using the code you can save image on sd card :

            FileOutputStream outStream = null;
            File f=new File(Environment.getExternalStorageDirectory()+"/My Image/");
            f.mkdir();
            String extStorageDirectory = f.toString();
            File file = new File(extStorageDirectory, "image.jpg");
            pathOfImage = file.getAbsolutePath();
            try {
                outStream = new FileOutputStream(file);
                bm.compress(Bitmap.CompressFormat.PNG, 100, outStream);
                Toast.makeText(getApplicationContext(), "Saved at "+f.getAbsolutePath(), Toast.LENGTH_LONG).show();
            } catch (FileNotFoundException e) {e.printStackTrace();}
            try {
                outStream.flush();
                outStream.close();
            } catch (IOException e) {e.printStackTrace();}

来源：https://stackoverflow.com/questions/29717038/android-saving-image-to-storage

标签

java

android

image

save