必须按照下面的方式配置否则报错，下面是解决方法
首先需要检查是否添加读写权限。然后再确认是否在程序中动态获取权限，获取方法如下，需要在调用相机之前进行获取。
ActivityCompat.requestPermissions(MainActivity.this,
new String[]{Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE},
1);
最后在AndroidManifest.xml文件中的application中添加如下代码。
android:requestLegacyExternalStorage="true"启动文件选择
在 onCreate里注册
activityResultLauncher = registerForActivityResult(
ActivityResultContracts.StartActivityForResult()
) {
val data = it.data
val resultCode = it.resultCode
val fileName: String?
if (PickUtils.getPath(this, data?.data).also { name ->
fileName = name
} != null) {
val name = PickUtils.getFileName(this, data?.data)
val fileTemp = File(fileName)
if (fileTemp.exists()) {
file = fileTemp
tvFileName.text = fileName
} else {
file = null
tvFileName.text = "文件不存在，请重新选择~"
}
}
}
在跳转的地方调用
val intent = Intent(Intent.ACTION_GET_CONTENT);
//intent.setType(“image*";//无类型限制
intent.addCategory(Intent.CATEGORY_OPENABLE);
activityResultLauncher?.launch(intent)
PickUtils代码
import android.annotation.SuppressLint;
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.provider.documentsContract;
import android.provider.MediaStore;
import android.provider.OpenableColumns;
import android.util.Log;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
public class PickUtils {
public static final String documentS_DIR = "documents";
@SuppressLint("NewApi")
public static 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);
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) {
try {
// note: id 可能为字符串，如在华为10.0系统上，选择文件后id为："msf:254"，导致转Long异常
Uri contentUri = ContentUris.withAppendedId(Uri.parse(contentUriPrefix), Long.parseLong(id));
String path = getDataColumn(context, contentUri, null, null);
if (path != null && !path.equals("")) {
return path;
}
} catch (Exception e) {
}
}
// path could not be retrieved using ContentResolver, therefore copy file to accessible cache using streams
String fileName = getFileName(context, uri);
File cacheDir = getdocumentCacheDir(context);
File file = generateFileName(fileName, cacheDir);
String destinationPath = null;
if (file != null) {
destinationPath = file.getAbsolutePath();
saveFileFromUri(context, uri, destinationPath);
}
return destinationPath;
}
// 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())) {
String path = getDataColumn(context, uri, null, null);
if (path != null && !path.equals("")) return path;
// path could not be retrieved using ContentResolver, therefore copy file to accessible cache using streams
String fileName = getFileName(context, uri);
File cacheDir = getdocumentCacheDir(context);
File file = generateFileName(fileName, cacheDir);
String destinationPath = null;
if (file != null) {
destinationPath = file.getAbsolutePath();
saveFileFromUri(context, uri, destinationPath);
}
return destinationPath;
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}
public static boolean isExternalStoragedocument(Uri uri) {
return "com.android.externalstorage.documents".equals(uri.getAuthority());
}
public static boolean isDownloadsdocument(Uri uri) {
return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}
public static boolean isMediadocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
public static String getDataColumn(Context context, Uri uri, String selection,
String[] selectionArgs) {
Cursor cursor = null;
final String column = "_data";
final String[] projection = {column};
String path = "";
try {
cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,
null);
if (cursor != null && cursor.moveToFirst()) {
final int column_index = cursor.getColumnIndexOrThrow(column);
path = cursor.getString(column_index);
return path;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (cursor != null)
cursor.close();
}
return path;
}
public static 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);
returnCursor.moveToFirst();
filename = returnCursor.getString(nameIndex);
returnCursor.close();
}
}
String[] filename_s = filename.split("\.", 2);
return filename_s[0];
}
public static String getName(String filename) {
if (filename == null) {
return null;
}
int index = filename.lastIndexOf('/');
return filename.substring(index + 1);
}
public static File getdocumentCacheDir(@NonNull Context context) {
Log.d("PickUtils", "getdocumentCacheDir");
File dir = new File(context.getCacheDir(), documentS_DIR);
if (!dir.exists()) {
dir.mkdirs();
}
return dir;
}
@Nullable
public static File generateFileName(@Nullable String name, File directory) {
if (name == null) {
return null;
}
File file = new File(directory, name);
if (file.exists()) {
String fileName = name;
String extension = "";
int dotIndex = name.lastIndexOf('.');
if (dotIndex > 0) {
fileName = name.substring(0, dotIndex);
extension = name.substring(dotIndex);
}
int index = 0;
while (file.exists()) {
index++;
name = fileName + '(' + index + ')' + extension;
file = new File(directory, name);
}
}
try {
if (!file.createNewFile()) {
return null;
}
} catch (IOException e) {
return null;
}
return file;
}
private static void saveFileFromUri(Context context, Uri uri, String destinationPath) {
InputStream is = null;
BufferedOutputStream bos = null;
try {
is = context.getContentResolver().openInputStream(uri);
bos = new BufferedOutputStream(new FileOutputStream(destinationPath, false));
byte[] buf = new byte[1024];
is.read(buf);
do {
bos.write(buf);
} while (is.read(buf) != -1);
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (is != null) is.close();
if (bos != null) bos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
