Intent ACTION_OPEN_DOCUMENT_TREE 似乎 return 不是真正的驱动路径
Intent ACTION_OPEN_DOCUMENT_TREE doesn't seem to return a real path to drive
我正在尝试从连接到我的 Google Pixel 的 USB 存储设备读取文件。我目前正在使用此方法 select 驱动器的路径,以便我可以查询它的内容
private static final String TAG = "MainActivity";
private static final int REQUEST_CHOOSE_DRIVE = 1;
private TextView tv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv = (TextView) findViewById(R.id.text);
Intent i = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE);
startActivityForResult(i, REQUEST_CHOOSE_DRIVE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_CHOOSE_DRIVE) {
Uri uri = data.getData();
}
}
但是,Uri 看起来像 /tree/...
,这似乎不是 Android 文件系统中的真实路径(通过 adb shell
验证)。我如何使用这个 uri
查询便携式存储设备的内容?我尝试使用给出的答案 但链接函数 returns null
.
您正在获取树 Uri。所以你需要添加下面的代码来从 Tree Uri 中获取文件。
DocumentFile documentFile = DocumentFile.fromTreeUri(this, uri);
for (DocumentFile file : documentFile.listFiles()) {
if(file.isDirectory()){ // if it is sub directory
// Do stuff with sub directory
}else{
// Do stuff with normal file
}
Log.d("Uri->",file.getUri() + "\n");
}
查询内容,可以使用下面的代码。
ContentResolver contentResolver = getActivity().getContentResolver();
Uri docUri = DocumentsContract.buildDocumentUriUsingTree(uri,
DocumentsContract.getTreeDocumentId(uri));
Uri childrenUri = DocumentsContract.buildChildDocumentsUriUsingTree(uri,
DocumentsContract.getTreeDocumentId(uri));
Cursor docCursor = contentResolver.query(docUri, new String[]{
Document.COLUMN_DISPLAY_NAME, Document.COLUMN_MIME_TYPE}, null, null, null);
try {
while (docCursor.moveToNext()) {
Log.d(TAG, "found doc =" + docCursor.getString(0) + ", mime=" + docCursor
.getString(1));
}
} finally {
// close cursor
}
我正在尝试从连接到我的 Google Pixel 的 USB 存储设备读取文件。我目前正在使用此方法 select 驱动器的路径,以便我可以查询它的内容
private static final String TAG = "MainActivity";
private static final int REQUEST_CHOOSE_DRIVE = 1;
private TextView tv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv = (TextView) findViewById(R.id.text);
Intent i = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE);
startActivityForResult(i, REQUEST_CHOOSE_DRIVE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_CHOOSE_DRIVE) {
Uri uri = data.getData();
}
}
但是,Uri 看起来像 /tree/...
,这似乎不是 Android 文件系统中的真实路径(通过 adb shell
验证)。我如何使用这个 uri
查询便携式存储设备的内容?我尝试使用给出的答案 null
.
您正在获取树 Uri。所以你需要添加下面的代码来从 Tree Uri 中获取文件。
DocumentFile documentFile = DocumentFile.fromTreeUri(this, uri);
for (DocumentFile file : documentFile.listFiles()) {
if(file.isDirectory()){ // if it is sub directory
// Do stuff with sub directory
}else{
// Do stuff with normal file
}
Log.d("Uri->",file.getUri() + "\n");
}
查询内容,可以使用下面的代码。
ContentResolver contentResolver = getActivity().getContentResolver();
Uri docUri = DocumentsContract.buildDocumentUriUsingTree(uri,
DocumentsContract.getTreeDocumentId(uri));
Uri childrenUri = DocumentsContract.buildChildDocumentsUriUsingTree(uri,
DocumentsContract.getTreeDocumentId(uri));
Cursor docCursor = contentResolver.query(docUri, new String[]{
Document.COLUMN_DISPLAY_NAME, Document.COLUMN_MIME_TYPE}, null, null, null);
try {
while (docCursor.moveToNext()) {
Log.d(TAG, "found doc =" + docCursor.getString(0) + ", mime=" + docCursor
.getString(1));
}
} finally {
// close cursor
}