公司APP要从/Android/data/com.tencent.mm/MicroMsg/Download选择文件上传，因为Android11权限问题，不让访问/Android/data了，网上搜了解决方案，这里记录一下
首先是请求权限
public void startForRoot() {
Uri uri1 = Uri.parse("content://com.android.externalstorage.documents/tree/primary%3AAndroid%2Fdata");
String uri = changeToUri(Environment.getExternalStorageDirectory().getPath());
uri = uri + "/document/primary%3A" + Environment.getExternalStorageDirectory().getPath().replace("/storage/emulated/0/", "").replace("/", "%2F");
Uri parse = Uri.parse(uri);
DocumentFile documentFile = DocumentFile.fromTreeUri(this, uri1);
Intent intent1 = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE);
intent1.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION
| Intent.FLAG_GRANT_WRITE_URI_PERMISSION
| Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION
| Intent.FLAG_GRANT_PREFIX_URI_PERMISSION);
intent1.putExtra(DocumentsContract.EXTRA_INITIAL_URI, documentFile.getUri());
startActivityForResult(intent1, 20);
}
网上找的，没什么说的
允许访问data文件
允许访问好了，然后在权限请求返回中保存该权限，下次访问就不需要再请求了
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 20 && data != null){
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
Uri uri = data.getData();
//这个是保存权限的
getContentResolver().takePersistableUriPermission(uri, data.getFlags() & (Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION));//关键是这里，这个就是保存这个目录的访问权限
}
//本地存一下，用于判断是否已有访问权限
SPUtils.putInt(mContext, ExamConstant.ANDROID_DATA, 1);
//扫描文件夹
scanFile();
}
}
扫描文件之后通过路径拼接拿到完整路径
//大概这样，伪代码
DocumentFile file ;;;
String path = "/Android/data/com.tencent.mm/MicroMsg/Download/" + file.getName()
但是这个路径在Android11里是会文件找不到，无法上传，没有吊用，还是权限问题，但是这个文件呢可以通过getContentResolver().openInputStream(Uri)开数据流，这样就可以复制文件操作了，如下：
//文件处理嘛，要在子线程，自己处理
try {
InputStream inputStream = mContext.getContentResolver().openInputStream(pathUri.getUri());
String path = pathUri.getPath();
int i = path.lastIndexOf("/") + 1;
String substring = path.substring(i);
String savePath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/Tineco/";
File directory = new File(savePath);
if (!directory.exists()) {
directory.mkdir();
}
File file = new File(savePath, substring);
FileOutputStream fos = new FileOutputStream(file);
long sum = 0;
byte[] buf = new byte[2048];
int len = 0;
while ((len = inputStream.read(buf)) != -1) {
fos.write(buf, 0, len);
sum += len;
}
fos.flush();
ToolAlert.closeLoading();
runOnUiThread(new Runnable() {
@Override
public void run() {
Intent intent = getIntent();
intent.putExtra("path", file.getAbsolutePath());
setResult(30, intent);
finish();
}
});
} catch (Exception e) {
e.printStackTrace();
}
//class PathUri 这个就是自己的类，主要保存路径或文件名和DocumentFile文件的Uri
// private String path;
//private Uri uri;
就是这个 InputStream inputStream = mContext.getContentResolver().openInputStream(uri);开流就可以读文件来复制了，当复制到其他非Android/data目录就可以操作文件上传了
这没什么复杂的，就是下面这个我也不会。。。就瞎写，就是通过DocumentFile.fromTreeUri()拿到对应文件夹，找到文件列表，通过流来复制出来该文件即可
File downloadFile = new File(mPath);
DocumentFile doucmentFile = getDoucmentFile(mContext, downloadFile.getAbsolutePath());
//不知道哪里写的不对，不能通过DocumentFile.fromTreeUri直接到Download目录，所以手动循环到该目录，
//DocumentFile.fromTreeUri 返回的是TreeDocumentFile，拥有listFiles()方法，
//而DocumentFile.fromSingleUri 返回的是SingleDocumentFile, 该类的listFiles()，源码里直接抛异常
// public DocumentFile[] listFiles() {
// throw new UnsupportedOperationException();
// }
try {
if (doucmentFile.isDirectory()){
DocumentFile[] documentFiles = doucmentFile.listFiles();
DocumentFile documentFile2 = null;
for (DocumentFile file : documentFiles) {
if (file.getName().equals("com.tencent.mm")){
documentFile2 = file;
break;
}
}
DocumentFile documentFile3 = null;
for (DocumentFile listFile : documentFile2.listFiles()) {
if (listFile.getName().equals("MicroMsg")){
documentFile3 = listFile;
break;
}
}
DocumentFile documentFile4 = null;
for (DocumentFile listFile : documentFile3.listFiles()) {
if (listFile.getName().equals("Download")){
documentFile4 = listFile;
break;
}
}//此时的documentFile4 才是download文件夹
for (DocumentFile filef : documentFile4.listFiles()) {
if (filef.isFile()){
list.add(new PathUri(filef.getName(), filef.getUri(), filef.lastModified()));
}
}
list.sort(new Comparator() {
@Override
public int compare(PathUri o1, PathUri o2) {
return (int) (o1.getModifyTime() - o2.getModifyTime());
}
});
}
}catch (Exception e){
e.printStackTrace();
}
//根据路径获得document文件
public static DocumentFile getDoucmentFile(Context context, String path) {
if (path.endsWith("/")) {
path = path.substring(0, path.length() - 1);
}
String path2 = path.replace("/storage/emulated/0/", "").replace("/", "%2F");
return DocumentFile.fromTreeUri(context, Uri.parse("content://com.android.externalstorage.documents/tree/primary%3AAndroid%2Fdata/document/primary%3A" + path2));
}
写的比较乱，总结一下，第一获取权限及保存权限，第二步拿到download目录，第三步通过流来复制文件到可以访问的其他目录
下面贴一下完整代码，写的挺low，业务部门的要求也低，能跑就行。。。如果你需要用到这个，请你一定优化一下，比如那里的取download目录，比如开子线程，比如文件复制等等，做一个合格的开发者，这里的解决办法来源于此文，感谢作者的无私分享参考来源
public class WechatFileActivity extends BaseActivityV2 {
@Bind(R.id.recyclerView)
RecyclerView recyclerView;
private RecyclerViewAdapter adapter;
private List list = new ArrayList<>();
private boolean retry;
@Override
public int bindLayout() {
return R.layout.act_wechat_file;
}
@Override
public void initParams(Bundle parms) {
}
@Override
public void initView(View view) {
ButterKnife.bind(this);
ToolAlert.loading(this, "加载中");
if (SPUtils.getInt(mContext, ExamConstant.ANDROID_DATA) == 1){
scanFile();
} else {
startForRoot();
}
}
public void startForRoot() {
Uri uri1 = Uri.parse("content://com.android.externalstorage.documents/tree/primary%3AAndroid%2Fdata");
String uri = changeToUri(Environment.getExternalStorageDirectory().getPath());
uri = uri + "/document/primary%3A" + Environment.getExternalStorageDirectory().getPath().replace("/storage/emulated/0/", "").replace("/", "%2F");
Uri parse = Uri.parse(uri);
DocumentFile documentFile = DocumentFile.fromTreeUri(this, uri1);
Intent intent1 = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE);
intent1.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION
| Intent.FLAG_GRANT_WRITE_URI_PERMISSION
| Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION
| Intent.FLAG_GRANT_PREFIX_URI_PERMISSION);
intent1.putExtra(DocumentsContract.EXTRA_INITIAL_URI, documentFile.getUri());
startActivityForResult(intent1, 20);
}
public String changeToUri(String path) {
if (path.endsWith("/")) {
path = path.substring(0, path.length() - 1);
}
String path2 = path.replace("/storage/emulated/0/", "").replace("/", "%2F");
return "content://com.android.externalstorage.documents/tree/primary%3AAndroid%2Fdata/document/primary%3A" + path2;
}
private void setRecyclerView() {
ToolAlert.closeLoading();
adapter = new RecyclerViewAdapter(mContext, list, R.layout.item_wechat_file) {
@Override
protected void bindViewHolder(RecyclerViewHolder holder, PathUri itemData, int position) {
ImageView imageView = holder.getView(R.id.ivImage);
HomeWorkUtils.showImage(itemData.getPath(), imageView);
holder.setText(R.id.tvName, itemData.getPath());
}
};
adapter.setOnItemClickListener(new RecyclerViewAdapter.OnItemClickListener() {
@Override
public void onItemClick(RecyclerViewHolder holder, Object itemData, int position) {
PathUri pathUri = (PathUri) itemData;
copyFileByUri(pathUri);
}
});
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setAdapter(adapter);
}
private void copyFileByUri(PathUri pathUri) {
ToolAlert.loading(mContext, "正在处理文件");
new Thread(new Runnable() {
@Override
public void run() {
try {
InputStream inputStream = mContext.getContentResolver().openInputStream(pathUri.getUri());
String path = pathUri.getPath();
int i = path.lastIndexOf("/") + 1;
String substring = path.substring(i);
String savePath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/Tineco/";
File directory = new File(savePath);
if (!directory.exists()) {
directory.mkdir();
}
File file = new File(savePath, substring);
FileOutputStream fos = new FileOutputStream(file);
long sum = 0;
byte[] buf = new byte[2048];
int len = 0;
while ((len = inputStream.read(buf)) != -1) {
fos.write(buf, 0, len);
sum += len;
}
fos.flush();
ToolAlert.closeLoading();
runOnUiThread(new Runnable() {
@Override
public void run() {
Intent intent = getIntent();
intent.putExtra("path", file.getAbsolutePath());
setResult(30, intent);
finish();
}
});
} catch (Exception e) {
e.printStackTrace();
}
}
}).start();
}
private String mPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/Android/data/com.tencent.mm/MicroMsg/Download";
private class ScanLargeFiles extends AsyncTask {
OnScanLargeFilesListener mOnScanLargeFilesListener;
public ScanLargeFiles(OnScanLargeFilesListener onActionListener) {
mOnScanLargeFilesListener = onActionListener;
}
@Override
protected void onProgressUpdate(String... values) {
super.onProgressUpdate(values);
}
@RequiresApi(api = Build.VERSION_CODES.N)
@Override
protected String doInBackground(Void... params) {
File downloadFile = new File(mPath);
DocumentFile doucmentFile = getDoucmentFile(mContext, downloadFile.getAbsolutePath());
//不知道哪里写的不对，不能通过DocumentFile.fromTreeUri直接到Download目录，所以手动循环到该目录，
//DocumentFile.fromTreeUri 返回的是TreeDocumentFile，拥有listFiles()方法，
//而DocumentFile.fromSingleUri 返回的是SingleDocumentFile, 该类的listFiles()，源码里直接抛异常
// public DocumentFile[] listFiles() {
// throw new UnsupportedOperationException();
// }
try {
if (doucmentFile.isDirectory()){
DocumentFile[] documentFiles = doucmentFile.listFiles();
DocumentFile documentFile2 = null;
for (DocumentFile file : documentFiles) {
if (file.getName().equals("com.tencent.mm")){
documentFile2 = file;
break;
}
}
DocumentFile documentFile3 = null;
for (DocumentFile listFile : documentFile2.listFiles()) {
if (listFile.getName().equals("MicroMsg")){
documentFile3 = listFile;
break;
}
}
DocumentFile documentFile4 = null;
for (DocumentFile listFile : documentFile3.listFiles()) {
if (listFile.getName().equals("Download")){
documentFile4 = listFile;
break;
}
}
for (DocumentFile filef : documentFile4.listFiles()) {
if (filef.isFile()){
list.add(new PathUri(filef.getName(), filef.getUri(), filef.lastModified()));
}
}
list.sort(new Comparator() {
@Override
public int compare(PathUri o1, PathUri o2) {
return (int) (o1.getModifyTime() - o2.getModifyTime());
}
});
}
}catch (Exception e){
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String result) {
if (mOnScanLargeFilesListener != null) {
mOnScanLargeFilesListener.onScanCompleted();
}
}
}
public interface OnScanLargeFilesListener{
void onScanCompleted();
}
//根据路径获得document文件
public static DocumentFile getDoucmentFile(Context context, String path) {
if (path.endsWith("/")) {
path = path.substring(0, path.length() - 1);
}
String path2 = path.replace("/storage/emulated/0/", "").replace("/", "%2F");
return DocumentFile.fromTreeUri(context, Uri.parse("content://com.android.externalstorage.documents/tree/primary%3AAndroid%2Fdata/document/primary%3A" + path2));
}
@Override
public void initListener() {
}
@Override
public void doBusiness(Context mContext) {
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 20 && data != null){
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
Uri uri = data.getData();
getContentResolver().takePersistableUriPermission(uri, data.getFlags() & (Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION));//关键是这里，这个就是保存这个目录的访问权限
}
SPUtils.putInt(mContext, ExamConstant.ANDROID_DATA, 1);
scanFile();
}
}
private void scanFile(){
ScanLargeFiles scanLargeFiles = new ScanLargeFiles(new OnScanLargeFilesListener() {
@Override
public void onScanCompleted() {
if (list.size() == 0){
if (!retry){
startForRoot();
} else {
ToastUtils.showShortToast(mContext, "没有找到文件");
}
} else {
setRecyclerView();
}
}
});
scanLargeFiles.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
}
@Override
public void resume() {
}
@Override
public void destroy() {
}
这个是取到的微信download文件夹，如果用户点击了，就复制该文件，然后返给上个页面复制文件的path
微信download目录下文件
有没有人知道里怎么把两张图同一排显示，即两张图左右排列？