我有一个Web服务,根据图像ID给我一个byte []数组。我想将这些byte []转换为文件并在android上存储一个文件,用户想要的文件保存文件对话框与文件格式相同。
您无法创建保存文件对话框,但您可以通过以下链接将文件从应用程序保存到android sd卡
http://android-er.blogspot.com/2010/07/save-file-to-sd-card.html
http://www.blackmoonit.com/android/filebrowser/intents#intent.pick_file.new
Android SDK不提供自己的文件对话框,因此您必须自己构建。
由于这是谷歌搜索该主题时的最佳结果,当我研究它时,它让我很困惑,我想我添加了这个问题的更新。从Android 19开始,就有一个内置的保存对话框。你没有事件需要任何权限(甚至不是WRITE_EXTERNAL_STORAGE)。它的工作方式非常简单:
//send an ACTION_CREATE_DOCUMENT intent to the system. It will open a dialog where the user can choose a location and a filename
Intent intent = new Intent(Intent.ACTION_CREATE_DOCUMENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("YOUR FILETYPE"); //not needed, but maybe usefull
intent.putExtra(Intent.EXTRA_TITLE, "YOUR FILENAME"); //not needed, but maybe usefull
startActivityForResult(intent, SOME_INTEGER);
...
//after the user has selected a location you get an uri where you can write your data to:
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode == SOME_INTEGER && resultCode == Activity.RESULT_OK) {
Uri uri = data.getData();
//just as an example, I am writing a String to the Uri I received from the user:
try {
OutputStream output = getContext().getContentResolver().openOutputStream(uri);
output.write(SOME_CONTENT.getBytes());
output.flush();
output.close();
}
catch(IOException e) {
Toast.makeText(context, "Error", Toast.LENGTH_SHORT).show();
}
}
}
更多这里:https://developer.android.com/guide/topics/providers/document-provider