我正在尝试从相册获取图片。
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select picture"), resultCode );
我从这个活动返回后，有一个包含Uri的数据。它看起来像这样：
content://media/external/images/1
如何将此路径转换为实际路径（就像 '/sdcard/image.png' 一样）？
谢谢
这就是我的做法：
Uri selectedImageURI = data.getData();
imageFile = new File(getRealPathFromURI(selectedImageURI));
并且：
private String getRealPathFromURI(Uri contentURI) {
String result;
Cursor cursor = getContentResolver().query(contentURI, null, null, null, null);
if (cursor == null) { // Source is Dropbox or other similar local file path
result = contentURI.getPath();
} else {
cursor.moveToFirst();
int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
result = cursor.getString(idx);
cursor.close();
}
return result;
}
注意： managedQuery() 方法已被弃用，因此我不使用它。
最后编辑：改进。我们应该关闭游标(cursor)!!
你真的需要获取物理路径吗？
例如，ImageView.setImageURI()和ContentResolver.openInputStream()可以让你在不知道其真实路径的情况下访问文件内容。
@Rene Juuse - 在评论中提供的链接非常感谢！
由于不同SDK的代码获取真实路径有所不同，因此以下有三种处理不同SDK的方法。
getRealPathFromURI_API19()：返回API 19（或以上版本但未经测试）的真实路径 getRealPathFromURI_API11to18()：返回API 11到API 18的真实路径 getRealPathFromURI_below11()：返回低于API 11的真实路径
public class RealPathUtil {
@SuppressLint("NewApi")
public static String getRealPathFromURI_API19(Context context, Uri uri){
String filePath = "";
String wholeID = DocumentsContract.getDocumentId(uri);
// Split at colon, use second item in the array
String id = wholeID.split(":")[1];
String[] column = { MediaStore.Images.Media.DATA };
// where id is equal to
String sel = MediaStore.Images.Media._ID + "=?";
Cursor cursor = context.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
column, sel, new String[]{ id }, null);
int columnIndex = cursor.getColumnIndex(column[0]);
if (cursor.moveToFirst()) {
filePath = cursor.getString(columnIndex);
}
cursor.close();
return filePath;
}
@SuppressLint("NewApi")
public static String getRealPathFromURI_API11to18(Context context, Uri contentUri) {
String[] proj = { MediaStore.Images.Media.DATA };
String result = null;
CursorLoader cursorLoader = new CursorLoader(
context,
contentUri, proj, null, null, null);
Cursor cursor = cursorLoader.loadInBackground();
if(cursor != null){
int column_index =
cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
result = cursor.getString(column_index);
}
return result;
}
public static String getRealPathFromURI_BelowAPI11(Context context, Uri contentUri){
String[] proj = { MediaStore.Images.Media.DATA };
Cursor cursor = context.getContentResolver().query(contentUri, proj, null, null, null);
int column_index
= cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
字体：http://hmkcode.com/android-display-selected-image-and-its-real-path/
2016年3月更新
为了解决所有有关图像路径的问题，我尝试创建一个自定义图库，就像Facebook和其他应用程序一样。这是因为您只能使用本地文件（真实文件，而不是虚拟或临时文件），我使用了这个库来解决所有问题。
https://github.com/nohana/Laevatein（此库用于从相机拍摄照片或从图库选择照片，如果您从图库中选择，则会显示一个带有相册的抽屉并仅显示本地文件）
content://com.android.providers.media.documents/document/image%3A52530
如果用户从滑动抽屉中选择图库而不是最近的照片，则我们将获得以下URI：
如果用户从侧边栏抽屉选择画廊而不是最近，则我们将获取URI。
content://media/external/images/media/52530
所以我需要在getRealPathFromURI_API19()中处理它。
public static String getRealPathFromURI_API19(Context context, Uri uri) {
String filePath = "";
if (uri.getHost().contains("com.android.providers.media")) {
// Image pick from recent
String wholeID = DocumentsContract.getDocumentId(uri);
// Split at colon, use second item in the array
String id = wholeID.split(":")[1];
String[] column = {MediaStore.Images.Media.DATA};
// where id is equal to
String sel = MediaStore.Images.Media._ID + "=?";
Cursor cursor = context.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
column, sel, new String[]{id}, null);
int columnIndex = cursor.getColumnIndex(column[0]);
if (cursor.moveToFirst()) {
filePath = cursor.getString(columnIndex);
}
cursor.close();
return filePath;
} else {
// image pick from gallery
return getRealPathFromURI_BelowAPI11(context,uri)
}
}
编辑1: 如果您正在尝试获取外部SD卡中文件的图像路径且版本较高，请查看我的问题
编辑2: 这里是完整的代码，可处理虚拟文件并主机不同于com.android.providers。我已经测试过这种方法与content://com.adobe.scan.android.documents/document/一起使用
编辑: 请使用此解决方案：https://dev59.com/YmIj5IYBdhLWcg3wnmXA#20559175。完美运作！
首先，感谢您的解决方案 @luizfelipetx。
我稍微修改了您的解决方案。这对我有效：
public static String getRealPathFromDocumentUri(Context context, Uri uri){
String filePath = "";
Pattern p = Pattern.compile("(\\d+)$");
Matcher m = p.matcher(uri.toString());
if (!m.find()) {
Log.e(ImageConverter.class.getSimpleName(), "ID for requested image not found: " + uri.toString());
return filePath;
}
String imgId = m.group();
String[] column = { MediaStore.Images.Media.DATA };
String sel = MediaStore.Images.Media._ID + "=?";
Cursor cursor = context.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
column, sel, new String[]{ imgId }, null);
int columnIndex = cursor.getColumnIndex(column[0]);
if (cursor.moveToFirst()) {
filePath = cursor.getString(columnIndex);
}
cursor.close();
return filePath;
}
注意：我们拥有文件和图像，具体取决于图像来自“最近”，“相册”或其他地方。因此，在查找之前，我首先提取图像ID。
将文件复制到真实路径并获取它们的路径是一种简单且最佳的方法，我在Android API-16到API-30上检查了10个设备，工作正常。
@Nullable
public static String createCopyAndReturnRealPath(
@NonNull Context context, @NonNull Uri uri) {
final ContentResolver contentResolver = context.getContentResolver();
if (contentResolver == null)
return null;
// Create file path inside app's data dir
String filePath = context.getApplicationInfo().dataDir + File.separator + "temp_file";
File file = new File(filePath);
try {
InputStream inputStream = contentResolver.openInputStream(uri);
if (inputStream == null)
return null;
OutputStream outputStream = new FileOutputStream(file);
byte[] buf = new byte[1024];
int len;
while ((len = inputStream.read(buf)) > 0)
outputStream.write(buf, 0, len);
outputStream.close();
inputStream.close();
} catch (IOException ignore) {
return null;
}
return file.getAbsolutePath();
}
File file = FileUtils.getFile(this, fileUri);
protected static final int CAMERA_REQUEST = 0;
protected static final int GALLERY_REQUEST = 1;
Bitmap bitmap;
Uri uri;
Intent picIntent = null;
//点击事件
if (v.getId()==R.id.image_id){
startDilog();
}
//方法体
private void startDilog() {
AlertDialog.Builder myAlertDilog = new AlertDialog.Builder(yourActivity.this);
myAlertDilog.setTitle("Upload picture option..");
myAlertDilog.setMessage("Where to upload picture????");
myAlertDilog.setPositiveButton("Gallery", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
picIntent = new Intent(Intent.ACTION_GET_CONTENT,null);
picIntent.setType("image/*");
picIntent.putExtra("return_data",true);
startActivityForResult(picIntent,GALLERY_REQUEST);
}
});
myAlertDilog.setNegativeButton("Camera", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
picIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(picIntent,CAMERA_REQUEST);
}
});
myAlertDilog.show();
}
//和其他事情一起
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode==GALLERY_REQUEST){
if (resultCode==RESULT_OK){
if (data!=null) {
uri = data.getData();
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
try {
BitmapFactory.decodeStream(getContentResolver().openInputStream(uri), null, options);
options.inSampleSize = calculateInSampleSize(options, 100, 100);
options.inJustDecodeBounds = false;
Bitmap image = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri), null, options);
imageofpic.setImageBitmap(image);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}else {
Toast.makeText(getApplicationContext(), "Cancelled",
Toast.LENGTH_SHORT).show();
}
}else if (resultCode == RESULT_CANCELED) {
Toast.makeText(getApplicationContext(), "Cancelled",
Toast.LENGTH_SHORT).show();
}
}else if (requestCode == CAMERA_REQUEST) {
if (resultCode == RESULT_OK) {
if (data.hasExtra("data")) {
bitmap = (Bitmap) data.getExtras().get("data");
uri = getImageUri(YourActivity.this,bitmap);
File finalFile = new File(getRealPathFromUri(uri));
imageofpic.setImageBitmap(bitmap);
} else if (data.getExtras() == null) {
Toast.makeText(getApplicationContext(),
"No extras to retrieve!", Toast.LENGTH_SHORT)
.show();
BitmapDrawable thumbnail = new BitmapDrawable(
getResources(), data.getData().getPath());
pet_pic.setImageDrawable(thumbnail);
}
} else if (resultCode == RESULT_CANCELED) {
Toast.makeText(getApplicationContext(), "Cancelled",
Toast.LENGTH_SHORT).show();
}
}
}
private String getRealPathFromUri(Uri tempUri) {
Cursor cursor = null;
try {
String[] proj = { MediaStore.Images.Media.DATA };
cursor = this.getContentResolver().query(tempUri, proj, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
} finally {
if (cursor != null) {
cursor.close();
}
}
}
public static int calculateInSampleSize(
BitmapFactory.Options options, int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
final int halfHeight = height / 2;
final int halfWidth = width / 2;
// Calculate the largest inSampleSize value that is a power of 2 and keeps both
// height and width larger than the requested height and width.
while ((halfHeight / inSampleSize) > reqHeight
&& (halfWidth / inSampleSize) > reqWidth) {
inSampleSize *= 2;
}
}
return inSampleSize;
}
private Uri getImageUri(YourActivity youractivity, Bitmap bitmap) {
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, byteArrayOutputStream);
String path = MediaStore.Images.Media.insertImage(youractivity.getContentResolver(), bitmap, "Title", null);
return Uri.parse(path);
}
options.inSampleSize = calculateInSampleSize(options, 100, 100); - John Joeprivate static String getRealPathFromURI(Uri uri, Context context) {
Uri returnUri = uri;
Cursor returnCursor = context.getContentResolver().query(returnUri, null, null, null, null);
int nameIndex = returnCursor.getColumnIndex(OpenableColumns.DISPLAY_NAME);
int sizeIndex = returnCursor.getColumnIndex(OpenableColumns.SIZE);
returnCursor.moveToFirst();
String name = (returnCursor.getString(nameIndex));
String size = (Long.toString(returnCursor.getLong(sizeIndex)));
File file = new File(context.getFilesDir(), name);
try {
InputStream inputStream = context.getContentResolver().openInputStream(uri);
FileOutputStream outputStream = new FileOutputStream(file);
int read = 0;
int maxBufferSize = 1 * 1024 * 1024;
int bytesAvailable = inputStream.available();
//int bufferSize = 1024;
int bufferSize = Math.min(bytesAvailable, maxBufferSize);
final byte[] buffers = new byte[bufferSize];
while ((read = inputStream.read(buffers)) != -1) {
outputStream.write(buffers, 0, read);
}
Log.e("File Size", "Size " + file.length());
inputStream.close();
outputStream.close();
Log.e("File Path", "Path " + file.getPath());
Log.e("File Size", "Size " + file.length());
} catch (Exception e) {
Log.e("Exception", e.getMessage());
}
return file.getPath();
}
uri.getPath()没有给出真实路径吗？ - Darpan