Intent intent = new Intent(Intent.ACTION_OPEN_document_TREE);startActivityForResult(intent,READ_REQUEST_CODE);
在我的活动中,我想捕捉实际路径,这似乎是不可能的.
protected voID onActivityResult(int requestCode,int resultCode,Intent intent){ super.onActivityResult(requestCode,resultCode,intent); if (resultCode == RESulT_OK) { if (androID.os.Build.VERSION.SDK_INT >= androID.os.Build.VERSION_CODES.M){ //Marshmallow } else if (androID.os.Build.VERSION.SDK_INT >= androID.os.Build.VERSION_CODES.LolliPOP){ //Set directory as default in preferences Uri treeUri = intent.getData(); //grant write permissions getContentResolver().takePersistableUriPermission(treeUri,Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION); //file myfile = new file(uri.getPath()); documentfile pickedDir = documentfile.fromTreeUri(this,treeUri);
我选择的文件夹位于:
Device storage/test/
我已经尝试了以下所有方法来获得确切的路径名称,但无济于事.
file myfile = new file (uri.getPath());//returns: /tree/1AF6-3708:testtreeUri.getPath();//returns: /tree/1AF6-3708:test/pickedDir.getname()//returns: testpickedDir.getParentfile()//returns: null
基本上我需要将/ tree / 1AF6-3708:转换为/ storage / emulated / 0 /或者每个设备调用它的存储位置.所有其他可用选项返回/ tree / 1AF6-37u08:也.
我想这样做有两个原因.
1)在我的应用程序中,我将文件位置存储为共享首选项,因为它是特定于用户的.我有相当多的数据将被下载和存储,我希望用户能够将它放在他们想要的地方,特别是如果他们有一个额外的存储位置.我确实设置了默认值,但我想要多功能性,而不是专用位置:
Device storage/AndroID/data/com.app.name/
2)在5.0中我想让用户获得该文件夹的读/写权限,这似乎是唯一的方法.如果我可以从解决此问题的字符串获得读/写权限.
我能找到的所有解决方案都与Mediastore有关,这对我没有帮助.我必须在某处丢失某些东西,否则我必须对它进行釉面处理.任何帮助,将不胜感激.谢谢.
解决方法 这将为您提供所选文件夹的实际路径(假设所选文件夹位于外部存储或外部SD卡中)Uri treeUri = data.getData();String path = fileUtil.getFullPathFromTreeUri(treeUri,this);
其中fileUtil是以下类
public final class fileUtil { static String TAG="TAG"; private static final String PRIMARY_VolUME_name = "primary"; @Nullable public static String getFullPathFromTreeUri(@Nullable final Uri treeUri,Context con) { if (treeUri == null) return null; String volumePath = getVolumePath(getVolumeIDFromTreeUri(treeUri),con); if (volumePath == null) return file.separator; if (volumePath.endsWith(file.separator)) volumePath = volumePath.substring(0,volumePath.length() - 1); String documentPath = getdocumentPathFromTreeUri(treeUri); if (documentPath.endsWith(file.separator)) documentPath = documentPath.substring(0,documentPath.length() - 1); if (documentPath.length() > 0) { if (documentPath.startsWith(file.separator)) return volumePath + documentPath; else return volumePath + file.separator + documentPath; } else return volumePath; } @Suppresslint("ObsoleteSdkInt") private static String getVolumePath(final String volumeID,Context context) { if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LolliPOP) return null; try { StorageManager mStorageManager = (StorageManager) context.getSystemService(Context.STORAGE_SERVICE); Class<?> storageVolumeClazz = Class.forname("androID.os.storage.StorageVolume"); Method getVolumeList = mStorageManager.getClass().getmethod("getVolumeList"); Method getUuID = storageVolumeClazz.getmethod("getUuID"); Method getPath = storageVolumeClazz.getmethod("getPath"); Method isPrimary = storageVolumeClazz.getmethod("isPrimary"); Object result = getVolumeList.invoke(mStorageManager); final int length = Array.getLength(result); for (int i = 0; i < length; i++) { Object storageVolumeElement = Array.get(result,i); String uuID = (String) getUuID.invoke(storageVolumeElement); Boolean primary = (Boolean) isPrimary.invoke(storageVolumeElement); // primary volume? if (primary && PRIMARY_VolUME_name.equals(volumeID)) return (String) getPath.invoke(storageVolumeElement); // other volumes? if (uuID != null && uuID.equals(volumeID)) return (String) getPath.invoke(storageVolumeElement); } // not found. return null; } catch (Exception ex) { return null; } } @TargetAPI(Build.VERSION_CODES.LolliPOP) private static String getVolumeIDFromTreeUri(final Uri treeUri) { final String docID = documentsContract.getTreedocumentID(treeUri); final String[] split = docID.split(":"); if (split.length > 0) return split[0]; else return null; } @TargetAPI(Build.VERSION_CODES.LolliPOP) private static String getdocumentPathFromTreeUri(final Uri treeUri) { final String docID = documentsContract.getTreedocumentID(treeUri); final String[] split = docID.split(":"); if ((split.length >= 2) && (split[1] != null)) return split[1]; else return file.separator; }}总结
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