如何在Android中的ListView中显示来自不同位置的两个条目

Question

我需要列出列表中不同位置的文件，但第二个对象总是破坏第一个对象，我很乐意帮助

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_listview);
File root = new File(Environment.getExternalStorageDirectory().toString() + "/DCIM/Camera");
ListDir(root);
File root1 = new File(Environment.getExternalStorageDirectory().toString() + "/Download" );
ListDir(root1);
}
void ListDir(File f)
{
File[] files = f.listFiles();
fileList.clear();
for (File file: files)
{
fileList.add(file.getName());
}
ArrayAdapter<String> dir = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_activated_1,fileList);
setListAdapter(dir);
}

Answer 1

请求的示例

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_listview);
ArrayList<File> roots = new ArrayList<>();
File root = new File(Environment.getExternalStorageDirectory().toString() + "/DCIM/Camera");
roots.add(root);
File root1 = new File(Environment.getExternalStorageDirectory().toString() + "/Download" );
roots.add(root1);
//After you've added as many directories as you need
ListDir(roots);
}
void ListDir(ArrayList<File> root_direcs)
{
fileList.clear();
for(File root : root_direcs){
fileList.addAll(Arrays.asList(root.listFiles()));
}
ArrayAdapter<String> dir = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_activated_1,fileList);
setListAdapter(dir);
}