Question

我正在创建一个能够一次上传多张图片的图片上传器。

galerijButton.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
        Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
        photoPickerIntent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);

        photoPickerIntent.setType("image/*");
        startActivityForResult(photoPickerIntent, SELECT_PHOTO);   
    }
});

...

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent) { 
    super.onActivityResult(requestCode, resultCode, imageReturnedIntent); 

    switch(requestCode) { 
    case SELECT_PHOTO:
        if(resultCode == RESULT_OK){  
            if(imageReturnedIntent.getData() != null){
                //If uploaded with Android Gallery (max 1 image)
                Uri selectedImage = imageReturnedIntent.getData();
                InputStream imageStream;
                try {
                    imageStream = getContentResolver().openInputStream(selectedImage);
                    Bitmap yourSelectedImage = BitmapFactory.decodeStream(imageStream);
                    photos.add(yourSelectedImage);
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                }
            } else {
                //If uploaded with the new Android Photos gallery
                ClipData clipData = imageReturnedIntent.getClipData();
                for(int i = 0; i < clipData.getItemCount(); i++){
                    clipData.getItemAt(i);
                    //What now?
                }
            }
        }
    break;
    ....

我想将所有选定的图像添加到我的照片数组ArrayList<Bitmap>。不知何故，我必须将ClipData.Item转换为Bitmap，但是如何？

Answer 1

试试这个

ClipData.Item item = clip.getItemAt(i);
Uri uri = item.getUri();

现在您拥有图片的 URI 。

我猜你现在知道该怎么做了。干杯：）

Answer 2

您将图像编码为字符串，当您想要使用它时，将其解码回图像。

对于图像列表，创建一个字符串数组并将其保存在该字符串中。

public static String encodeTobase64(Bitmap image) {
    Bitmap immage = image;
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    immage.compress(Bitmap.CompressFormat.JPEG, 100, baos);
    byte[] b = baos.toByteArray();
    String imageEncoded = Base64.encodeToString(b, Base64.DEFAULT);
    Log.d("Image Log:", imageEncoded);
    return imageEncoded;
}

public static Bitmap decodeBase64(String input) {
    try {
        byte[] encodeByte = Base64.decode(input, Base64.DEFAULT);
        InputStream is = new ByteArrayInputStream(encodeByte);
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inPreferredConfig = Config.ALPHA_8;
        options.inSampleSize = 2;
        Bitmap bitmap = BitmapFactory.decodeStream(is, null, options);
        return bitmap;
    } catch (Exception e) {
        e.getMessage();
        return null;
    }
}

Answer 3

使用 Kotlin one liner 实现：

private fun ClipData.convertToList(): List<Uri> = 0.rangeTo(itemCount).map { getItemAt(it).uri }

Android - 如何从ClipData获取图像？

3 个答案: