近期有一个上传PDF文件的需求，因此做了一个选择手机系统文件的功能，期间遇到过几个问题，在此记录一下，归根结底其本质还是适配Android10和Android11的问题
主要问题：拿不到返回的路径、拿不到返回的真实路径
跳转到系统选择文件：
private fun selectFile()
{
val intent = Intent(Intent.ACTION_GET_CONTENT)
intent.type = "*/*" //无类型限制
intent.addCategory(Intent.CATEGORY_OPENABLE)
startActivityForResult(intent, 1)
}
根据Uri获取文件路径：
import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.os.FileUtils;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.provider.OpenableColumns;
import android.text.TextUtils;
import android.util.Log;
import androidx.annotation.RequiresApi;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class GetFilePathFromUri {
/**
* 根据Uri获取文件绝对路径，解决Android4.4以上版本Uri转换 兼容Android 10
*
* @param context
* @param imageUri
*/
public static String getFileAbsolutePath(Context context, Uri imageUri) {
if (context == null || imageUri == null) {
return null;
}
//4.4以下的版本
if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.KITKAT) {
return getRealFilePath(context, imageUri);
}
//大于4.4，小于10
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT
&& android.os.Build.VERSION.SDK_INT < Build.VERSION_CODES.Q
&& DocumentsContract.isDocumentUri(context, imageUri)) {
if (isExternalStorageDocument(imageUri)) {
String docId = DocumentsContract.getDocumentId(imageUri);
String[] split = docId.split(":");
String type = split[0];
if ("primary".equalsIgnoreCase(type)) {
return Environment.getExternalStorageDirectory() + "/" + split[1];
}
} else if (isDownloadsDocument(imageUri)) {
String id = DocumentsContract.getDocumentId(imageUri);
Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
return getDataColumn(context, contentUri, null, null);
} else if (isMediaDocument(imageUri)) {
String docId = DocumentsContract.getDocumentId(imageUri);
String[] split = docId.split(":");
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;
}
String selection = MediaStore.Images.Media._ID + "=?";
String[] selectionArgs = new String[]{split[1]};
return getDataColumn(context, contentUri, selection, selectionArgs);
}
}
// MediaStore (and general) 大于等于10
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q){
return uriToFileApiQ(context,imageUri);
}
else if ("content".equalsIgnoreCase(imageUri.getScheme())) {
// Return the remote address
if (isGooglePhotosUri(imageUri)) {
return imageUri.getLastPathSegment();
}
if (Build.VERSION.SDK_INT >= 24)
{
return getFilePathFromUri(context,imageUri); //content 类型
}else {
return getDataColumn(context, imageUri, null, null);
}
}
// File
else if ("file".equalsIgnoreCase(imageUri.getScheme())) {
return imageUri.getPath();
}
return null;
}
private static String getRealFilePath(final Context context, final Uri uri) {
if (null == uri) {
return null;
}
final String scheme = uri.getScheme();
String data = null;
if (scheme == null) {
data = uri.getPath();
} else if (ContentResolver.SCHEME_FILE.equals(scheme)) {
data = uri.getPath();
} else if (ContentResolver.SCHEME_CONTENT.equals(scheme)) {
String[] projection = {MediaStore.Images.ImageColumns.DATA};
Cursor cursor = context.getContentResolver().query(uri, projection, null, null, null);
if (null != cursor) {
if (cursor.moveToFirst()) {
int index = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
if (index > -1) {
data = cursor.getString(index);
}
}
cursor.close();
}
}
return data;
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is ExternalStorageProvider.
*/
private static 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.
*/
private static boolean isDownloadsDocument(Uri uri) {
return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}
private static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
Cursor cursor = null;
String column = MediaStore.Images.Media.DATA;
String[] projection = {column};
try {
cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
if (cursor != null && cursor.moveToFirst()) {
int index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(index);
}
} finally {
if (cursor != null) {
cursor.close();
}
}
return null;
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is MediaProvider.
*/
private static boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is Google Photos.
*/
private static boolean isGooglePhotosUri(Uri uri) {
return "com.google.android.apps.photos.content".equals(uri.getAuthority());
}
/**
* Android 10 以上适配 另一种写法
* @param context
* @param uri
* @return
*/
private static String getFileFromContentUri(Context context, Uri uri) {
if (uri == null) {
return null;
}
String filePath;
String[] filePathColumn = {MediaStore.MediaColumns.DATA, MediaStore.MediaColumns.DISPLAY_NAME};
ContentResolver contentResolver = context.getContentResolver();
Cursor cursor = contentResolver.query(uri, filePathColumn, null,
null, null);
if (cursor != null) {
cursor.moveToFirst();
try {
filePath = cursor.getString(cursor.getColumnIndex(filePathColumn[0]));
return filePath;
} catch (Exception e) {
} finally {
cursor.close();
}
}
return "";
}
/**
* Android 10 以上适配
* @param context
* @param uri
* @return
*/
private static String uriToFileApiQ(Context context, Uri uri) {
File file = null;
//android10以上转换
if (uri.getScheme().equals(ContentResolver.SCHEME_FILE)) {
file = new File(uri.getPath());
} else if (uri.getScheme().equals(ContentResolver.SCHEME_CONTENT)) {
//把文件复制到沙盒目录
ContentResolver contentResolver = context.getContentResolver();
Cursor cursor = contentResolver.query(uri, null, null, null, null);
if (cursor.moveToFirst()) {
String displayName = cursor.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME));
try {
InputStream is = contentResolver.openInputStream(uri);
File file1 = new File(context.getExternalCacheDir().getAbsolutePath()+"/"+System.currentTimeMillis());
if (!file1.exists())
{
file1.mkdir();
}
File cache = new File(file1.getPath(), displayName);
FileOutputStream fos = new FileOutputStream(cache);
FileUtils.copy(is, fos);
file = cache;
fos.close();
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return file.getAbsolutePath();
}
private static String getFilePathFromUri(Context context,Uri uri)
{
String realFilePath = getRealFilePath(context,uri); //防止获取不到真实的地址，因此这里需要进行判断
if (!TextUtils.isEmpty(realFilePath))
{
return realFilePath;
}
File filesDir = context.getApplicationContext().getFilesDir();
String fileName = getFileName(uri);
if (!TextUtils.isEmpty(fileName))
{
File copyFile1 = new File(filesDir + File.separator + fileName);
copyFile(context,uri,copyFile1);
return copyFile1.getAbsolutePath();
}
return null;
}
private static String getFileName(Uri uri)
{
if (uri == null)
{
return null;
}
String fileName = null;
String path = uri.getPath();
int cut = path.lastIndexOf('/');
if (cut != -1)
{
fileName = path.substring(cut+1);
}
return fileName;
}
private static void copyFile(Context context, Uri srcUri, File dstFile) {
try {
InputStream inputStream = context.getContentResolver().openInputStream(srcUri);
if (inputStream == null)
{
return;
}
OutputStream outputStream = new FileOutputStream(dstFile);
copyStream(inputStream, outputStream);
inputStream.close();
outputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
private static int copyStream(InputStream input, OutputStream output){
final int BUFFER_SIZE = 1024 * 2;
byte[] buffer = new byte[BUFFER_SIZE];
BufferedInputStream in = new BufferedInputStream(input, BUFFER_SIZE);
BufferedOutputStream out = new BufferedOutputStream(output, BUFFER_SIZE);
int count = 0, n = 0;
try {
while ((n = in.read(buffer, 0, BUFFER_SIZE)) != -1) {
out.write(buffer, 0, n);
count += n;
}
out.flush();
}
catch (Exception e)
{
}finally {
try {
out.close();
in.close();
} catch (Exception e) {
}
}
return count;
}
}
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