从android文件系统中选择多个文件

Question

在尝试从android文件系统中选择图像时，我目前使用以下代码：

public void getPhotoFromSystem(View v) //implement selecting multiple files
{
    Intent intent = new Intent();
    intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
    intent.setAction(Intent.ACTION_GET_CONTENT);
    intent.setType("image/*)");
    startActivityForResult(intent, READ_REQUEST_CODE);
}

然后是一种方法，例如：

    public void onActivityResult(int requestCode, int resultCode, Intent resultData)
  {  
            if (requestCode == READ_REQUEST_CODE && resultCode == Activity.RESULT_OK){
                uri = resultData.getData();
                //do some more stuff
  }

这是可行的，但实际上不允许我一次选择多个文件，也不允许我在默认照片库之外抓取照片。我尝试了一些我见过的其他建议，但没有任何效果。

Answer 1

当我们选择多个文件时，结果位于ClipData下，因此我们需要从数据中获取ClipData，然后遍历其他文件以获取Uri的数量。

 if (data.getClipData()!=null){
        //multiple data received
        ClipData clipData = data.getClipData();
        for (int count =0; count<clipData.getItemCount(); count++){
            Uri uri = clipData.getItemAt(count).getUri());
            //do something 
        }
    }

注：这适用于API级别16及以上。

Answer 2

我从您的问题中了解到的是，您需要一次性选择多个图像。

请注意，Android的选择器在某些设备上有照片和图库。照片允许选择多个图像。图库一次只允许一个。

Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("image/*"); //allows any image file type. Change * to specific extension to limit it
//**These following line is the important one!
intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
startActivityForResult(Intent.createChooser(intent, "Select Picture"), SELECT_PICTURES); //SELECT_PICTURES is simply a global int used to check the calling intent in onActivityResult

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(requestCode == SELECT_PICTURES) {
        if(resultCode == Activity.RESULT_OK) {
            if(data.getClipData() != null) {
                int count = data.getClipData().getItemCount();
                int currentItem = 0;
                while(currentItem < count) {
                    Uri imageUri = data.getClipData().getItemAt(currentItem).getUri();
                    //do something with the image (save it to some directory or whatever you need to do with it here)
                    currentItem = currentItem + 1;
                }
            } else if(data.getData() != null) {
                String imagePath = data.getData().getPath();
                //do something with the image (save it to some directory or whatever you need to do with it here)
            }
        }
    }
}