Android Storage Access Framework: Welchen Pfad sollte ich zum Speichern einer Datei verwenden?

Question

Ich erhalte per SAF mit dem unten stehenden Code die Erlaubnis zu meiner herausnehmbaren SD-Karte. Mit einem Klick auf die Floating-Schaltfläche "Datei" gebe ich die Berechtigungen für meine App. Danach möchte ich eine Datei mit dem FAB "Ordner" erstellen.

Wenn ich versuche, die Datei in den URI-Pfad zu speichern, heißt es, dass der Pfad nicht existiert. Welchen Pfad muss ich verwenden? (String [] Pfad nur für verschiedene Pfade Testen ...)

FAB-File

FloatingActionButton fab_new_file = (FloatingActionButton) rLayoutFrgEmpresas.findViewById(R.id.fab_menu_item_file); 
fab_new_file.setOnClickListener(new View.OnClickListener() { 

    @Override 
    public void onClick(View view) { 
     System.out.print("FAB File clicked"); 
     Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE); 
     intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true); 
     intent.putExtra(Intent.EXTRA_LOCAL_ONLY, true); 
     intent.addFlags(Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION); 
     intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION); 
     intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION); 
     startActivityForResult(intent, 42); 
    } 
}); 
mainPath = this.getArguments().getString("mainpath"); 
getFilesFromDir(mainPath, mainPath); 
return rLayoutFrgEmpresas; 

onActivityActionResult

@Override 
    public void onActivityResult(int requestCode, int resultCode, Intent data){ 
     System.out.print("onActivityResult started"); 
     if (resultCode == Activity.RESULT_OK) { 
      if (data != null) { 
       treeUri = data.getData(); 

       System.out.print("treeUri: "+treeUri); 
       if (requestCode == 42){ 

        int takeFlags = data.getFlags(); 
        takeFlags &= (Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION); 

        getContext().getContentResolver().takePersistableUriPermission(treeUri, takeFlags); 
        System.out.print("Permissions: "+getContext().getContentResolver().getPersistedUriPermissions()); 

        editor = getActivity().getSharedPreferences("spicysoftware.com.phonemanager", MODE_PRIVATE).edit(); 
        editor.putString("treeUri", treeUri.toString()); 
        if(editor.commit()){ 
         System.out.print("treeUri sharedPref added"); 
        } 
       } 
      } 
     } 
     super.onActivityResult(requestCode, resultCode, data); 
    } 

FAB-Faltblatt

FloatingActionButton fab_new_folder = (FloatingActionButton) rLayoutFrgEmpresas.findViewById(R.id.fab_menu_item_folder); 
fab_new_folder.setOnClickListener(new View.OnClickListener() { 
    @Override 
    public void onClick(View view) { 
     Log.i("Information: ", "FAB Folder clicked"); 

     String str_treeUri = prefs.getString("treeUri", null); 
     Uri myUri = Uri.parse(str_treeUri); 

     Log.i("Information: ", "myUri from shared Pref: "+myUri); 

     String[] path = { 
       ""+myUri, 
       ""+myUri+"/", 
       "/com.android.externalstorage.documents/tree/B9BE-18A6/", 
       "/tree/B9BE-18A6/", 
       "/storage/B9BE-18A6/" 
     }; 

     for(int i=0; i<path.length; i++) { 
      File testfile = new File("" + path[i] + "testfile" + System.currentTimeMillis() + ".txt"); 
      if (!testfile.exists()) { 
       Log.i("Information: ", testfile+ " does not exist"); 
       try { 
        testfile.createNewFile(); 
        getFilesFromDir(textView_currentPath.getText() + "", textView_currentPath.getText() + ""); 
        Log.i("File " + testfile, "has been created!"); 
       } catch (IOException e) { 
        e.printStackTrace(); 
       } 
      } 
     } 
    } 
}); 

LogCat

*Before clicked FAB-File* 
04-12 16:41:26.748 2197-2197/spicysoftware.com.phonemanager D/ViewRootImpl@ab22b33[MainActivity]: ViewPostImeInputStage processPointer 0 
04-12 16:41:26.821 2197-2197/spicysoftware.com.phonemanager D/ViewRootImpl@ab22b33[MainActivity]: ViewPostImeInputStage processPointer 1 
04-12 16:41:26.833 2197-2197/spicysoftware.com.phonemanager I/Information:: FAB File clicked 
04-12 16:41:26.868 2197-2197/spicysoftware.com.phonemanager D/ViewRootImpl@ab22b33[MainActivity]: MSG_WINDOW_FOCUS_CHANGED 0 
04-12 16:41:27.036 2197-2197/spicysoftware.com.phonemanager D/InputTransport: Input channel destroyed: fd=73 
04-12 16:41:34.131 2197-2197/spicysoftware.com.phonemanager I/Information:: onActivityResult started 
04-12 16:41:34.140 2197-2197/spicysoftware.com.phonemanager I/Information:: Permissions: [UriPermission {uri=content://com.android.externalstorage.documents/tree/B9BE-18A6%3A, modeFlags=3, persistedTime=1492008094137}] 
04-12 16:41:34.151 2197-2197/spicysoftware.com.phonemanager I/Information:: treeUri sharedPref added 
04-12 16:41:34.173 2197-2285/spicysoftware.com.phonemanager D/mali_winsys: EGLint new_window_surface(egl_winsys_display*, void*, EGLSurface, EGLConfig, egl_winsys_surface**, egl_color_buffer_format*, EGLBoolean) returns 0x3000, [1080x1920]-format:1 
*After clicked FAB-File* 

    *Before clicked FAB-Folder* 
04-12 17:04:36.011 25159-25159/spicysoftware.com.phonemanager D/ViewRootImpl@ab22b33[MainActivity]: ViewPostImeInputStage processPointer 0 
04-12 17:04:36.084 25159-25159/spicysoftware.com.phonemanager D/ViewRootImpl@ab22b33[MainActivity]: ViewPostImeInputStage processPointer 1 
04-12 17:04:36.093 25159-25159/spicysoftware.com.phonemanager I/Information:: FAB Folder clicked 
04-12 17:04:36.093 25159-25159/spicysoftware.com.phonemanager I/Information:: myUri from shared Pref: content://com.android.externalstorage.documents/tree/B9BE-18A6%3A 
04-12 17:04:36.094 25159-25159/spicysoftware.com.phonemanager I/Information:: content:/com.android.externalstorage.documents/tree/B9BE-18A6%3Atestfile1492009476094.txt does not exist 
04-12 17:04:36.094 25159-25159/spicysoftware.com.phonemanager W/System.err: java.io.IOException: No such file or directory 
04-12 17:04:36.094 25159-25159/spicysoftware.com.phonemanager W/System.err:  at java.io.UnixFileSystem.createFileExclusively0(Native Method) 
04-12 17:04:36.094 25159-25159/spicysoftware.com.phonemanager W/System.err:  at java.io.UnixFileSystem.createFileExclusively(UnixFileSystem.java:280) 
04-12 17:04:36.094 25159-25159/spicysoftware.com.phonemanager W/System.err:  at java.io.File.createNewFile(File.java:948) 
04-12 17:04:36.094 25159-25159/spicysoftware.com.phonemanager W/System.err:  at spicysoftware.com.phonemanager.StorageFragment$1.onClick(StorageFragment.java:172) 
04-12 17:04:36.094 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.view.View.performClick(View.java:6207) 
04-12 17:04:36.094 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.view.View$PerformClick.run(View.java:23639) 
04-12 17:04:36.094 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.os.Handler.handleCallback(Handler.java:751) 
04-12 17:04:36.094 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.os.Handler.dispatchMessage(Handler.java:95) 
04-12 17:04:36.094 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.os.Looper.loop(Looper.java:154) 
04-12 17:04:36.094 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.app.ActivityThread.main(ActivityThread.java:6688) 
04-12 17:04:36.094 25159-25159/spicysoftware.com.phonemanager W/System.err:  at java.lang.reflect.Method.invoke(Native Method) 
04-12 17:04:36.094 25159-25159/spicysoftware.com.phonemanager W/System.err:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468) 
04-12 17:04:36.094 25159-25159/spicysoftware.com.phonemanager W/System.err:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358) 
04-12 17:04:36.095 25159-25159/spicysoftware.com.phonemanager I/Information:: content:/com.android.externalstorage.documents/tree/B9BE-18A6%3A/testfile1492009476095.txt does not exist 
04-12 17:04:36.095 25159-25159/spicysoftware.com.phonemanager W/System.err: java.io.IOException: No such file or directory 
04-12 17:04:36.095 25159-25159/spicysoftware.com.phonemanager W/System.err:  at java.io.UnixFileSystem.createFileExclusively0(Native Method) 
04-12 17:04:36.095 25159-25159/spicysoftware.com.phonemanager W/System.err:  at java.io.UnixFileSystem.createFileExclusively(UnixFileSystem.java:280) 
04-12 17:04:36.095 25159-25159/spicysoftware.com.phonemanager W/System.err:  at java.io.File.createNewFile(File.java:948) 
04-12 17:04:36.095 25159-25159/spicysoftware.com.phonemanager W/System.err:  at spicysoftware.com.phonemanager.StorageFragment$1.onClick(StorageFragment.java:172) 
04-12 17:04:36.095 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.view.View.performClick(View.java:6207) 
04-12 17:04:36.095 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.view.View$PerformClick.run(View.java:23639) 
04-12 17:04:36.095 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.os.Handler.handleCallback(Handler.java:751) 
04-12 17:04:36.095 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.os.Handler.dispatchMessage(Handler.java:95) 
04-12 17:04:36.095 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.os.Looper.loop(Looper.java:154) 
04-12 17:04:36.095 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.app.ActivityThread.main(ActivityThread.java:6688) 
04-12 17:04:36.095 25159-25159/spicysoftware.com.phonemanager W/System.err:  at java.lang.reflect.Method.invoke(Native Method) 
04-12 17:04:36.095 25159-25159/spicysoftware.com.phonemanager W/System.err:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468) 
04-12 17:04:36.095 25159-25159/spicysoftware.com.phonemanager W/System.err:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358) 
04-12 17:04:36.095 25159-25159/spicysoftware.com.phonemanager I/Information:: /com.android.externalstorage.documents/tree/B9BE-18A6/testfile1492009476095.txt does not exist 
04-12 17:04:36.096 25159-25159/spicysoftware.com.phonemanager W/System.err: java.io.IOException: No such file or directory 
04-12 17:04:36.096 25159-25159/spicysoftware.com.phonemanager W/System.err:  at java.io.UnixFileSystem.createFileExclusively0(Native Method) 
04-12 17:04:36.096 25159-25159/spicysoftware.com.phonemanager W/System.err:  at java.io.UnixFileSystem.createFileExclusively(UnixFileSystem.java:280) 
04-12 17:04:36.096 25159-25159/spicysoftware.com.phonemanager W/System.err:  at java.io.File.createNewFile(File.java:948) 
04-12 17:04:36.096 25159-25159/spicysoftware.com.phonemanager W/System.err:  at spicysoftware.com.phonemanager.StorageFragment$1.onClick(StorageFragment.java:172) 
04-12 17:04:36.096 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.view.View.performClick(View.java:6207) 
04-12 17:04:36.096 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.view.View$PerformClick.run(View.java:23639) 
04-12 17:04:36.096 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.os.Handler.handleCallback(Handler.java:751) 
04-12 17:04:36.096 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.os.Handler.dispatchMessage(Handler.java:95) 
04-12 17:04:36.096 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.os.Looper.loop(Looper.java:154) 
04-12 17:04:36.096 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.app.ActivityThread.main(ActivityThread.java:6688) 
04-12 17:04:36.096 25159-25159/spicysoftware.com.phonemanager W/System.err:  at java.lang.reflect.Method.invoke(Native Method) 
04-12 17:04:36.096 25159-25159/spicysoftware.com.phonemanager W/System.err:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468) 
04-12 17:04:36.096 25159-25159/spicysoftware.com.phonemanager W/System.err:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358) 
04-12 17:04:36.096 25159-25159/spicysoftware.com.phonemanager I/Information:: /tree/B9BE-18A6/testfile1492009476096.txt does not exist 
04-12 17:04:36.097 25159-25159/spicysoftware.com.phonemanager W/System.err: java.io.IOException: No such file or directory 
04-12 17:04:36.097 25159-25159/spicysoftware.com.phonemanager W/System.err:  at java.io.UnixFileSystem.createFileExclusively0(Native Method) 
04-12 17:04:36.097 25159-25159/spicysoftware.com.phonemanager W/System.err:  at java.io.UnixFileSystem.createFileExclusively(UnixFileSystem.java:280) 
04-12 17:04:36.097 25159-25159/spicysoftware.com.phonemanager W/System.err:  at java.io.File.createNewFile(File.java:948) 
04-12 17:04:36.097 25159-25159/spicysoftware.com.phonemanager W/System.err:  at spicysoftware.com.phonemanager.StorageFragment$1.onClick(StorageFragment.java:172) 
04-12 17:04:36.097 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.view.View.performClick(View.java:6207) 
04-12 17:04:36.097 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.view.View$PerformClick.run(View.java:23639) 
04-12 17:04:36.097 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.os.Handler.handleCallback(Handler.java:751) 
04-12 17:04:36.097 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.os.Handler.dispatchMessage(Handler.java:95) 
04-12 17:04:36.097 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.os.Looper.loop(Looper.java:154) 
04-12 17:04:36.097 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.app.ActivityThread.main(ActivityThread.java:6688) 
04-12 17:04:36.097 25159-25159/spicysoftware.com.phonemanager W/System.err:  at java.lang.reflect.Method.invoke(Native Method) 
04-12 17:04:36.097 25159-25159/spicysoftware.com.phonemanager W/System.err:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468) 
04-12 17:04:36.097 25159-25159/spicysoftware.com.phonemanager W/System.err:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358) 
04-12 17:04:36.097 25159-25159/spicysoftware.com.phonemanager I/Information:: /storage/B9BE-18A6/testfile1492009476097.txt does not exist 
04-12 17:04:36.098 25159-25159/spicysoftware.com.phonemanager W/System.err: java.io.IOException: Permission denied 
04-12 17:04:36.098 25159-25159/spicysoftware.com.phonemanager W/System.err:  at java.io.UnixFileSystem.createFileExclusively0(Native Method) 
04-12 17:04:36.098 25159-25159/spicysoftware.com.phonemanager W/System.err:  at java.io.UnixFileSystem.createFileExclusively(UnixFileSystem.java:280) 
04-12 17:04:36.098 25159-25159/spicysoftware.com.phonemanager W/System.err:  at java.io.File.createNewFile(File.java:948) 
04-12 17:04:36.098 25159-25159/spicysoftware.com.phonemanager W/System.err:  at spicysoftware.com.phonemanager.StorageFragment$1.onClick(StorageFragment.java:172) 
04-12 17:04:36.098 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.view.View.performClick(View.java:6207) 
04-12 17:04:36.098 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.view.View$PerformClick.run(View.java:23639) 
04-12 17:04:36.098 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.os.Handler.handleCallback(Handler.java:751) 
04-12 17:04:36.098 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.os.Handler.dispatchMessage(Handler.java:95) 
04-12 17:04:36.098 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.os.Looper.loop(Looper.java:154) 
04-12 17:04:36.098 25159-25159/spicysoftware.com.phonemanager W/System.err:  at android.app.ActivityThread.main(ActivityThread.java:6688) 
04-12 17:04:36.098 25159-25159/spicysoftware.com.phonemanager W/System.err:  at java.lang.reflect.Method.invoke(Native Method) 
04-12 17:04:36.098 25159-25159/spicysoftware.com.phonemanager W/System.err:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468) 
04-12 17:04:36.098 25159-25159/spicysoftware.com.phonemanager W/System.err:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358) 
04-12 17:04:48.021 25159-25159/spicysoftware.com.phonemanager D/ViewRootImpl@ab22b33[MainActivity]: ViewPostImeInputStage processKey 0 
04-12 17:04:48.046 25159-25159/spicysoftware.com.phonemanager D/ViewRootImpl@ab22b33[MainActivity]: ViewPostImeInputStage processKey 1 
    *After clicked FAB-Folder* 

Answer 1

ich mit Code-Berechtigungen auf meine herausnehmbaren SD-Karte über SAF erhalten unter

Nein, Sie nicht. Sie erhalten Zugriff auf einen Dokumentenbaum. Wo sich der Dokumentbaum befindet, bleibt dem Benutzer überlassen. Es könnte auf externem Speicher, Wechselspeicher, Google Drive oder irgendwo anders sein, dass der Benutzer eine DocumentProvider für hat.

Danach möchte ich eine Datei mit dem FAB "Ordner" erstellen.

können Sie DocumentFile und fromTreeUri() verwenden die Uri, dass Sie wieder von ACTION_OPEN_DOCUMENT_TREE bekam zu wickeln. Verwenden Sie dann das, um Teilbäume zu erstellen, und erhalten Sie Uri Werte, die auf Inhalt in diesen Bäumen zeigen. Dann verwenden Sie ContentResolver und openOutputStream() mit der Uri, um eine OutputStream zu erhalten, in die Sie den Inhalt schreiben können.

Welchen Pfad muss ich verwenden?

Keine. Eine Uri ist keine Datei.