我正在尝试为用户从其图库中选择的图片获取FileInputStream对象，当我尝试从我收到的URI中打开文件时，它会一直说FileNotFoundException。 ..
这是我用来启动从图库中选择图像的意图的代码：
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE_REQUEST);
这是我用来捕捉onActivityResult的代码：
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {
Uri uri = data.getData();
File myFile = new File(uri.getPath());
FileInputStream fiStream = new FileInputStream(myFile);
...
}
}
创建FileInputStream时，我通过模拟器选择了一张照片时出现了以下错误：
W/System.err: java.io.FileNotFoundException: /document/image:26171: open failed: ENOENT (No such file or directory)
也许我正在从URI中检索文件错误???非常感谢任何帮助，谢谢!!
我最终使用https://android-arsenal.com/details/1/2725 这很容易使用！
答案 0 :(得分：6)
我有完全相同的问题。
我的问题 我正在使用此代码
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null){
Uri uri = data.getData();
try {
Bitmap bitmap = MediaStore.Images.Media.getBitmap(getActivity().getContentResolver(), uri);
直到我发现它无法处理更大的图像。 我不得不改变并使用另一种方法来获取图像。
使用InputStream
File file= new File(uri.getPath());
FileInputStream inputStream= new FileInputStream(file);
这给出了一个文件未找到的路径格式异常是原因
正如克诺索斯所说
＆＃34;你试图打开的Uri是 内容：//文件/图像：26171。你需要用一个访问它 ContentProvider的
感谢Paul Burke和他的图书馆aFileChooser http://github.com/iPaulPro/aFileChooser
为了简单起见，只需创建一个我称之为 FileChooser.java
的类。 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;
public class FileChooser {
/**
* Get a file path from a Uri. This will get the the path for Storage Access
* Framework Documents, as well as the _data field for the MediaStore and
* other file-based ContentProviders.
*
* @param context The context.
* @param uri The Uri to query.
* @author paulburke
*/
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];
}
// TODO handle non-primary volumes
}
// DownloadsProvider
else if (isDownloadsDocument(uri)) {
final String id = DocumentsContract.getDocumentId(uri);
final Uri contentUri = ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
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;
}
/**
* 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 static 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 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.
*/
public static 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 static boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
}
然后我们可以在活动结果中轻松访问它
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null){
Uri uri = data.getData();
try {
InputStream in = new FileInputStream(FileChooser.getPath(getContext(),uri));
因为我想在使用之前调整图像大小，所以有完整的代码...我希望它可以帮助某人...;）感谢blubl
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null){
Uri uri = data.getData();
try {
/*Bitmap bitmap = MediaStore.Images.Media.getBitmap(getActivity().getContentResolver(), uri);*/
InputStream in = new FileInputStream(FileChooser.getPath(getContext(),uri));
int dstWidth = 1980;
int dstHeight = 960;
int inWidth, inHeight;
//get image size
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeStream(in, null, options);
in.close();
inWidth = options.outWidth;
inHeight = options.outHeight;
in = new FileInputStream(FileChooser.getPath(getContext(),uri));
options = new BitmapFactory.Options();
// decode full image pre resized
options.inSampleSize = Math.max(inWidth/dstWidth, inHeight/dstHeight);
Bitmap roughtBitmap = BitmapFactory.decodeStream(in, null, options);
Matrix m = new Matrix();
RectF inRect = new RectF(0, 0, roughtBitmap.getWidth(), roughtBitmap.getHeight());
RectF outRectF = new RectF(0, 0, dstWidth, dstHeight);
m.setRectToRect(inRect, outRectF, Matrix.ScaleToFit.CENTER);
float[] values = new float[9];
m.getValues(values);
Bitmap resizedBitmap = Bitmap.createScaledBitmap(roughtBitmap, (int)(roughtBitmap.getWidth() * values[0]), (int)(roughtBitmap.getHeight() * values[4]), true);
currentQrItem.setPicture(resizedBitmap);
adapter.changeImage(currentQrItem);
}catch (IOException e){
e.printStackTrace();
}
}
}
答案 1 :(得分：1)
Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
intent.setType("image/*");
startActivityForResult(Intent.createChooser(intent, "Select File"), SELECT_FILE);
//在onactivity结果
Uri selectedImageUri = data.getData();
String[] projection = { MediaStore.MediaColumns.DATA };
CursorLoader cursorLoader = new CursorLoader(this,selectedImageUri, projection, null, null,null);
Cursor cursor =cursorLoader.loadInBackground();
int column_index = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA);
cursor.moveToFirst();
String selectedImagePath = cursor.getString(column_index);
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
final int REQUIRED_SIZE = 200;
int scale = 1;
while (options.outWidth / scale / 2 >= REQUIRED_SIZE
&& options.outHeight / scale / 2 >= REQUIRED_SIZE)
scale *= 2;
options.inSampleSize = scale;
options.inJustDecodeBounds = false;
Bitmap bitmap = BitmapFactory.decodeFile(selectedImagePath, options);
答案 2 :(得分：0)
这里的问题是您尝试访问内容Uri，就好像它是一个文件。
您尝试打开的Uri是content://document/image:26171。您需要使用ContentProvider。
可以通过这个伟大的Stack Overflow answer找到一个这样做的例子。
答案 3 :(得分：0)
你的目标是23 sdk版本吗？如果是这样，您必须获得READ_EXTERNAL_STORAGE的运行时权限。