Program: 11142
Project: 11142
Buggy source:
@Override public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState){
  View rootView=inflater.inflate(R.layout.fragment_main,container,false);
  MaterialFlatButton filePickerActivity=(MaterialFlatButton)rootView.findViewById(R.id.file_picker_activity);
  filePickerActivity.setOnClickListener(new View.OnClickListener(){
    @Override public void onClick(    View view){
      Intent filePickerActivity=new Intent(getActivity(),FilePickerActivity.class);
      filePickerActivity.putExtra(FilePickerActivity.SCOPE_TYPE,Scope.ALL);
      filePickerActivity.putExtra(FilePickerActivity.REQUEST_CODE,Request.DIRECTORY);
      filePickerActivity.putExtra(FilePickerActivity.INTENT_EXTRA_FAB_COLOR_ID,android.R.color.holo_green_dark);
      startActivityForResult(filePickerActivity,REQUEST_DIRECTORY);
    }
  }
);
  MaterialFlatButton filePickerForFile=(MaterialFlatButton)rootView.findViewById(R.id.file_picker_return_file_path);
  filePickerForFile.setOnClickListener(new View.OnClickListener(){
    @Override public void onClick(    View view){
      Intent filePicker=new Intent(getActivity(),FilePickerActivity.class);
      filePicker.putExtra(FilePickerActivity.SCOPE_TYPE,Scope.ALL);
      filePicker.putExtra(FilePickerActivity.REQUEST_CODE,FilePickerActivity.REQUEST_FILE);
      filePicker.putExtra(FilePickerActivity.INTENT_EXTRA_COLOR_ID,android.R.color.holo_orange_dark);
      startActivityForResult(filePicker,FilePickerActivity.REQUEST_FILE);
    }
  }
);
  MaterialFlatButton filePickerDialog=(MaterialFlatButton)rootView.findViewById(R.id.file_picker_dialog);
  filePickerDialog.setOnClickListener(new View.OnClickListener(){
    @Override public void onClick(    View view){
      Intent filePickerDialogIntent=new Intent(getActivity(),FilePickerActivity.class);
      filePickerDialogIntent.putExtra(FilePickerActivity.THEME_TYPE,ThemeType.DIALOG);
      filePickerDialogIntent.putExtra(FilePickerActivity.REQUEST_CODE,FilePickerActivity.REQUEST_FILE);
      startActivityForResult(filePickerDialogIntent,FilePickerActivity.REQUEST_FILE);
    }
  }
);
  MaterialFlatButton filePickerMimePng=(MaterialFlatButton)rootView.findViewById(R.id.file_picker_mime_png);
  filePickerMimePng.setOnClickListener(new View.OnClickListener(){
    @Override public void onClick(    View view){
      Intent filePicker=new Intent(getActivity(),FilePickerActivity.class);
      filePicker.putExtra(FilePickerActivity.SCOPE_TYPE,Scope.ALL);
      filePicker.putExtra(FilePickerActivity.REQUEST_CODE,FilePickerActivity.REQUEST_FILE);
      filePicker.putExtra(FilePickerActivity.INTENT_EXTRA_COLOR_ID,android.R.color.holo_green_dark);
      filePicker.putExtra(FilePickerActivity.MIME_TYPE,FileType.PNG);
      startActivityForResult(filePicker,FilePickerActivity.REQUEST_FILE);
    }
  }
);
  MaterialFlatButton newFilePicker=(MaterialFlatButton)rootView.findViewById(R.id.new_file_picker_activity);
  newFilePicker.setOnClickListener(new View.OnClickListener(){
    @Override public void onClick(    View view){
      new FilePickerBuilder(getActivity()).withColor(android.R.color.holo_blue_bright).withRequest(Request.FILE).withScopeType(Scope.ALL).withMimeType(FileType.JPEG).useMaterialActivity(true).launch(REQUEST_FILE);
    }
  }
);
  return rootView;
}

Fixed version (ground truth):
@Override public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState){
  View rootView=inflater.inflate(R.layout.fragment_main,container,false);
  MaterialFlatButton filePickerActivity=(MaterialFlatButton)rootView.findViewById(R.id.file_picker_activity);
  filePickerActivity.setOnClickListener(new View.OnClickListener(){
    @Override public void onClick(    View view){
      Intent filePickerActivity=new Intent(getActivity(),FilePickerActivity.class);
      filePickerActivity.putExtra(FilePickerActivity.SCOPE,Scope.ALL);
      filePickerActivity.putExtra(FilePickerActivity.REQUEST,Request.DIRECTORY);
      filePickerActivity.putExtra(FilePickerActivity.INTENT_EXTRA_FAB_COLOR_ID,android.R.color.holo_green_dark);
      startActivityForResult(filePickerActivity,REQUEST_DIRECTORY);
    }
  }
);
  MaterialFlatButton filePickerForFile=(MaterialFlatButton)rootView.findViewById(R.id.file_picker_return_file_path);
  filePickerForFile.setOnClickListener(new View.OnClickListener(){
    @Override public void onClick(    View view){
      Intent filePicker=new Intent(getActivity(),FilePickerActivity.class);
      filePicker.putExtra(FilePickerActivity.SCOPE,Scope.ALL);
      filePicker.putExtra(FilePickerActivity.REQUEST,Request.FILE);
      filePicker.putExtra(FilePickerActivity.INTENT_EXTRA_COLOR_ID,android.R.color.holo_orange_dark);
      startActivityForResult(filePicker,REQUEST_FILE);
    }
  }
);
  MaterialFlatButton filePickerDialog=(MaterialFlatButton)rootView.findViewById(R.id.file_picker_dialog);
  filePickerDialog.setOnClickListener(new View.OnClickListener(){
    @Override public void onClick(    View view){
      Intent filePickerDialogIntent=new Intent(getActivity(),FilePickerActivity.class);
      filePickerDialogIntent.putExtra(FilePickerActivity.THEME_TYPE,ThemeType.DIALOG);
      filePickerDialogIntent.putExtra(FilePickerActivity.REQUEST,Request.FILE);
      startActivityForResult(filePickerDialogIntent,REQUEST_FILE);
    }
  }
);
  MaterialFlatButton filePickerMimePng=(MaterialFlatButton)rootView.findViewById(R.id.file_picker_mime_png);
  filePickerMimePng.setOnClickListener(new View.OnClickListener(){
    @Override public void onClick(    View view){
      Intent filePicker=new Intent(getActivity(),FilePickerActivity.class);
      filePicker.putExtra(FilePickerActivity.SCOPE,Scope.ALL);
      filePicker.putExtra(FilePickerActivity.REQUEST,Request.FILE);
      filePicker.putExtra(FilePickerActivity.INTENT_EXTRA_COLOR_ID,android.R.color.holo_green_dark);
      filePicker.putExtra(FilePickerActivity.MIME_TYPE,MimeType.PNG);
      startActivityForResult(filePicker,REQUEST_FILE);
    }
  }
);
  MaterialFlatButton newFilePicker=(MaterialFlatButton)rootView.findViewById(R.id.new_file_picker_activity);
  newFilePicker.setOnClickListener(new View.OnClickListener(){
    @Override public void onClick(    View view){
      new FilePickerBuilder(getActivity()).withColor(android.R.color.holo_blue_bright).withRequest(Request.FILE).withScope(Scope.ALL).withMimeType(MimeType.JPEG).useMaterialActivity(true).launch(REQUEST_FILE);
    }
  }
);
  return rootView;
}