我正在尝试打开listview项目上的下载文件，点击android N.它在API 24下工作正常，但是API 24及更高版本，当我尝试打开它时显示“无法打开文件”。我认为文件路径可能不正确，但我已经尝试了所有我知道的工作，但它不起作用。请帮我解决这个问题。
GalleryFragment.java
/**************** Create Custom Adapter *********/
adapter = new ItemAdapter(getActivity(), arraylist, res);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
clickposition = position;
textView = (TextView) view.findViewById(R.id.txtitem);
imageView = (ImageView) view.findViewById(R.id.listimage);
if (!temp.contains(position)) {
url = Uri.parse(array[position][1]);
listitemname = array[position][0];
DownloadData();
temp.add(position);
complete = false;
}
if (complete && temp.contains(position)) {
// File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getAbsolutePath(), listitemname); //"storage/sdcard0/Android/data/triad.com.catagoriesapp/files/Download",
if (file.exists()) {
Uri uri;
if (Build.VERSION.SDK_INT < 24) {
uri = filepath[position];
} else {
String u= (filepath[position]).getPath();
if (u.substring(0, 8).matches("file:///")) {
u = u.substring(8);
}
if (u.substring(0, 7).matches("file://")) {
u = u.substring(7);
}
File file = new File(u);
uri = FileProvider.getUriForFile(getActivity(), getActivity().getApplicationContext().getPackageName() + ".provider", file);
}
Intent mpOpenintent = new Intent(Intent.ACTION_VIEW);
mpOpenintent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
mpOpenintent.setDataAndType(uri, "*/*");
try {
startActivity(mpOpenintent);
} catch (ActivityNotFoundException e) {
}
// complete = false;
}
}
}
});
}
return view;
}
ArrayList<Integer> temp = new ArrayList<>();
TextView textView1;
ImageView imageView1;
long downloadReference;
private long DownloadData() {
imageView.setImageResource(R.drawable.download1);
textView1 = textView;
imageView1 = imageView;
// Create request for android download manager
downloadManager = (DownloadManager) getActivity().getSystemService(DOWNLOAD_SERVICE);
DownloadManager.Request request = new DownloadManager.Request(url);
request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI | DownloadManager.Request.NETWORK_MOBILE);
request.setAllowedOverRoaming(false);
//Setting title of request
request.setTitle("File " + listitemname + " Downloaded");
//Setting description of request
request.setDescription("File " + listitemname + " download in progress.");
request.setDestinationInExternalFilesDir(getActivity(), Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getAbsolutePath(), listitemname);
// if (PermissionCheck.readAndWriteExternalStorage(getActivity())) {
// request.setDestinationInExternalPublicDir(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getAbsolutePath(), listitemname);
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
//Enqueue download and save into referenceId
downloadReference = downloadManager.enqueue(request);
return downloadReference;
}
@Override
public void onStop() {
try {
getActivity().unregisterReceiver(downloadReceiver);
} catch (Exception e) {
}
super.onStop();
}
@Override
public void onResume() {
try {
getActivity().registerReceiver(downloadReceiver,filter);
} catch (Exception e) {
}
super.onResume();
}
// File[] xfilepath = new File[15];
int clickposition;
Uri path;
File file;
boolean complete = false;
DownloadManager downloadManager;
Cursor c;
DownloadManager.Query query;
String apkUri;
Uri[] filepath = new Uri[15];
private BroadcastReceiver downloadReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (imageView1 == null) {
return;
}
String action = intent.getAction();
if (DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(action)) {
complete = true;
long downloadId = intent.getLongExtra(
DownloadManager.EXTRA_DOWNLOAD_ID, 0);
imageView1.setVisibility(View.GONE);
textView1.setVisibility(View.VISIBLE);
if (Build.VERSION.SDK_INT < 24) {
query = new DownloadManager.Query();
query.setFilterById(downloadReference);
c = downloadManager.query(query);
if (c != null && c.getCount() > 0) {
if (c.moveToFirst()) {
int columnIndex = c.getColumnIndex(DownloadManager.COLUMN_STATUS);
if (DownloadManager.STATUS_SUCCESSFUL == c.getInt(columnIndex)) {
apkUri = c.getString(1);
file = new File(apkUri);
path = Uri.fromFile(file);
filepath[clickposition] = path;
///add
}
}
}
} else {
//Your read write code.
query = new DownloadManager.Query();
query.setFilterById(downloadReference);
c = downloadManager.query(query);
if (c.moveToFirst()) {
int columnIndex = c.getColumnIndex(DownloadManager.COLUMN_STATUS);
if (DownloadManager.STATUS_SUCCESSFUL == c.getInt(columnIndex)) {
apkUri = c.getString(8);//.substring(8,c.getString(8).length());///
//
if (apkUri.substring(0, 8).matches("file:///")) {
apkUri = apkUri.substring(8);
}
if (apkUri.substring(0, 7).matches("file://")) {
apkUri = apkUri.substring(7);
}
file = new File(apkUri);
path = Uri.fromFile(file);
// path = FileProvider.getUriForFile(getActivity(), getActivity().getApplicationContext().getPackageName() + ".provider", file);
filepath[clickposition] = path;
if (!file.exists()) {
return;
}
// getActivity().unregisterReceiver(downloadReceiver);
}
}
}
}
}
};
public void setListData(String array[][], int listlength) {
for (int i = 0; i < listlength; i++) {
final ItemModel item = new ItemModel();
/******* Firstly take data in model object ******/
item.setName(array[i][0]);
/******** Take Model Object in ArrayList **********/
arraylist.add(item);
}
}
}
这是我的provider_paths.xml -
<?xml version="1.0" encoding="utf-8"?>
<paths>
<external-path path="Android/data/triad.com.catagoriesapp/" name="files_root" />
<external-path path="." name="external_storage_root" />
</paths>