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一、Android8 调用文件管理器并返回选中文件的路径的时候可以参考这个文章。 Android中调用文件管理器并返回选中文件的路径_潘侯爷的博客-CSDN博客 二、Android11的从图标打开ExternalStorage是跟之前一样的。但是是打开Recent、Images、Downloads的时候各种问题，同样的软件在android8的时候可以运行，到Android11就不行，这里简单总结一下在Android11的时候打开浏览器的demo。 1、打开文件管理器的效果。
2、测试过的demo 代码如下： package com.giada.fileexplorer; import androidx.annotation.NonNull; import androidx.appcompat.app.AppCompatActivity; import android.annotation.SuppressLint; import android.app.Activity; import android.content.ContentUris; import android.content.Context; import android.content.Intent; import android.database.Cursor; import android.net.Uri; import android.os.Build; import android.os.Bundle; import android.os.Environment; import android.provider.DocumentsContract; import android.provider.MediaStore; import android.provider.OpenableColumns; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; import java.io.File; public class MainActivity extends AppCompatActivity { TextView tv; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button btn = (Button) findViewById(R.id.confirm); tv = (TextView) findViewById(R.id.textView); btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Uri uri = Uri.parse("content://com.android.externalstorage.documents/document/primary:"); Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT); intent.addCategory(Intent.CATEGORY_OPENABLE); intent.setType("*/*"); intent.putExtra(DocumentsContract.EXTRA_INITIAL_URI, uri); startActivityForResult(intent, 1); } }); } String path = "NULL"; @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (resultCode == Activity.RESULT_OK) { Uri uri = data.getData(); if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT) {//4.4以后 path = getPath(this, uri); tv.setText("uri.getAuthority()="+uri.getAuthority()+" path:"+path); } else {//4.4以下下系统调用方法 // path = getRealPathFromURI(uri); //tv.setText(path); // Toast.makeText(MainActivity.this, path+"222222", Toast.LENGTH_SHORT).show(); } } } public String getRealPathFromURI(Uri contentUri) { String res = null; String[] proj = { MediaStore.Images.Media.DATA }; Cursor cursor = getContentResolver().query(contentUri, proj, null, null, null); if(null!=cursor&&cursor.moveToFirst()){; int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); res = cursor.getString(column_index); cursor.close(); } return res; } /** * 专为Android4.4设计的从Uri获取文件绝对路径，以前的方法已不好使 */ @SuppressLint("NewApi") public String getPath(final Context context, final Uri uri) { final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT; // DocumentProvider if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) { // ExternalStorageProvider if (isExternalStorageDocument(uri)) { final String docId = DocumentsContract.getDocumentId(uri); final String[] split = docId.split(":"); final String type = split[0]; if ("primary".equalsIgnoreCase(type)) { return Environment.getExternalStorageDirectory() + "/" + split[1]; } } // DownloadsProvider else if (isDownloadsDocument(uri)) { final String id = DocumentsContract.getDocumentId(uri); Log.d("FUCKFUCK", id); if (id != null && id.startsWith("raw:")) { return id.substring(4); } String[] contentUriPrefixesToTry = new String[]{ "content://downloads/public_downloads", "content://downloads/my_downloads" }; for (String contentUriPrefix : contentUriPrefixesToTry) { Uri contentUri = ContentUris.withAppendedId(Uri.parse(contentUriPrefix), Long.valueOf(id)); try { String path = getDataColumn(context, contentUri, null, null); if (path != null && !path.equals("")) { return path; } } catch (Exception e) { } } String fileName = getFileName(context, uri); if(!fileName.toLowerCase().contains("/storage/emulated/0/Download/".toLowerCase())) { fileName = "/storage/emulated/0/Download/"+fileName; } return "fileName = " +fileName; /* final Uri contentUri = ContentUris.withAppendedId( Uri.parse("content://downloads/public_downloads"), Long.valueOf(id)); // Toast.makeText(MainActivity.this, " Long.valueOf(id) "+Long.valueOf(id), Toast.LENGTH_SHORT).show(); return getDataColumn(context, contentUri, null, null); */ } // MediaProvider else if (isMediaDocument(uri)) { final String docId = DocumentsContract.getDocumentId(uri); final String[] split = docId.split(":"); final String type = split[0]; Uri contentUri = null; if ("image".equals(type)) { contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; } else if ("video".equals(type)) { contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI; } else if ("audio".equals(type)) { contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; } final String selection = "_id=?"; final String[] selectionArgs = new String[]{split[1]}; return getDataColumn(context, contentUri, selection, selectionArgs); } } // MediaStore (and general) else if ("content".equalsIgnoreCase(uri.getScheme())) { //return getDataColumn(context, uri, null, null); } // File else if ("file".equalsIgnoreCase(uri.getScheme())) { // return uri.getPath(); } return "NULL"; } public String getFileName(@NonNull Context context, Uri uri) { String mimeType = context.getContentResolver().getType(uri); String filename = null; if (mimeType == null && context != null) { /* String path = getPath(context, uri); if (path == null) { filename = getName(uri.toString()); } else { File file = new File(path); filename = file.getName(); }*/ } else { Cursor returnCursor = context.getContentResolver().query(uri, null, null, null, null); if (returnCursor != null) { int nameIndex = returnCursor.getColumnIndex(OpenableColumns.DISPLAY_NAME); Log.d("FUCKFUCK nameIndex", ""+nameIndex); returnCursor.moveToFirst(); filename = returnCursor.getString(nameIndex); returnCursor.close(); } } return filename; } public String getName(String filename) { if (filename == null) { return null; } int index = filename.lastIndexOf('/'); return filename.substring(index + 1); } /** * Get the value of the data column for this Uri. This is useful for * MediaStore Uris, and other file-based ContentProviders. * * @param context The context. * @param uri The Uri to query. * @param selection (Optional) Filter used in the query. * @param selectionArgs (Optional) Selection arguments used in the query. * @return The value of the _data column, which is typically a file path. */ public String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) { Cursor cursor = null; final String column = "_data"; final String[] projection = {column}; try { cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null); if (cursor != null && cursor.moveToFirst()) { final int column_index = cursor.getColumnIndexOrThrow(column); return cursor.getString(column_index); } } finally { if (cursor != null) cursor.close(); } return null; } /** * @param uri The Uri to check. * @return Whether the Uri authority is ExternalStorageProvider. */ public boolean isExternalStorageDocument(Uri uri) { return "com.android.externalstorage.documents".equals(uri.getAuthority()); } /** * @param uri The Uri to check. * @return Whether the Uri authority is DownloadsProvider. */ public boolean isDownloadsDocument(Uri uri) { return "com.android.providers.downloads.documents".equals(uri.getAuthority()); } /** * @param uri The Uri to check. * @return Whether the Uri authority is MediaProvider. */ public boolean isMediaDocument(Uri uri) { return "com.android.providers.media.documents".equals(uri.getAuthority()); } }3、布局文件 4、src\main\AndroidManifest.xml添加权限 三、测试结果
四、过程中会遇到的问题 1、打开Download目录会提示 java.lang.IllegalArgumentException: Unknown URI: content://downloads/public_downloads/11，download目录好像比较特殊，Authority是这个com.android.providers.downloads.documents"
解决方法，加try catch 抛出异常
2、在downlaod目录下有个很长文件名的一个文件，获取的路径只有文件名，而没有前面的路径。
我能想到的方案，但是是最笨的解决方案，添加下面红框的内容。
3、Android 调用系统文件管理器在指定路径目录打开文件，Android 8 以上可以使用 DocumentsContract.EXTRA_INITIAL_URI 来实现，例如指定：/sdcard/Download Uri uri = Uri.parse("content://com.android.externalstorage.documents/document/primary:Download"); Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT); intent.addCategory(Intent.CATEGORY_OPENABLE); intent.setType("*/*"); intent.putExtra(DocumentsContract.EXTRA_INITIAL_URI, uri); startActivityForResult(intent, 1);五、参考文章 Android中调用文件管理器并返回选中文件的路径_潘侯爷的博客-CSDN博客 https://segmentfault.com/q/1010000021126126/a-1020000021139219 Uri转Path。修复java.lang.IllegalArgumentException: Unknown URI: content://downloads/public_ - 简书 |
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