Question

我是Android的新手，并试图使用现有的相机制作应用程序。我试图将图像保存在dcim目录中。现在应用程序创建一个文件，但没有图像，我怎么能前进，如何保存图像提前谢谢

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public static class App {
    public static File file;
    public static File directory;
}
private void CreateDirectoryForPictures() {
    File path= Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
    App.directory = new File(path,"Mahapach_Images");
    if (!App.directory.exists()) {
        App.directory.getParentFile().mkdirs();
    }
}
private void takeAPicture(){
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = "JPEG_" + timeStamp + "_";
    CreateDirectoryForPictures();
    Intent intent =new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    App.file = new File(App.directory,imageFileName);
    intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(App.file));
    startActivityForResult(intent,1);
}
private void choosePhotoFromGallery() {
    Intent intent = new Intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
    startActivityForResult(intent, 2);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == RESULT_OK) {
        if (requestCode == 1) {
            //make it available in the gallery
            Intent mediaScanIntent = new Intent (Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
            Uri contentUri = Uri.fromFile(App.file);
            mediaScanIntent.setData(contentUri);
            sendBroadcast(mediaScanIntent);
        }
        else if (requestCode == 2) {
                Uri selectedImage = data.getData();
                String[] filePath = {MediaStore.Images.Media.DATA};
                Cursor c = getContentResolver().query(selectedImage, filePath, null, null, null);
                c.moveToFirst();
                int columnIndex = c.getColumnIndex(filePath[0]);
                String picturePath = c.getString(columnIndex);
                c.close();
                Bitmap thumbnail = (BitmapFactory.decodeFile(picturePath));
                Log.e("path image from gallery", picturePath + "");
                infoWindowImageView.setImageBitmap(thumbnail);
            }
    }
}

Answer 1

您可以通过谷歌轻松找到许多教程，这可以完成您的任务，我发现here

OR

有更好的方法，使用Easy Image库可以轻松完成任务click here但请记住你必须照顾marshmallow和Android版本以上的权限。

尝试保存图像使用现有的相机应用程序

1 个答案: