问题描述
在 Android 应用程序中，
我可以从其 URI 中获取图像的路径
现在在 Android 10 中，null 作为文件路径返回
您可以在下面看到功能：
public static String getRealPathFromURI(Context context,Uri contentUri,String type) {
Cursor cursor = null;
String path = null;
try {
String[] projection = {type};
cursor = context.getContentResolver().query(contentUri,projection,null,null);
if (cursor == null)
return null;
int columnIndex = cursor.getColumnIndexOrThrow(type);
cursor.movetoFirst();
path = cursor.getString(columnIndex);
// we choose image from drive etc.
if (path == null)
path = getDocumentRealPathFromUri(context,contentUri);
} catch (Exception e) {
e.printstacktrace();
} finally {
if (cursor != null)
cursor.close();
}
return path;
}
public static String getFullSizeImagePath(Context context,Uri uri)
{
String filePath;
if (validateUri(uri) && uri.toString().contains("file"))
filePath = uri.getPath();
else
filePath = getRealPathFromURI(context,uri,MediaStore.Images.Media.DATA);
if (filePath == null)
return null;
return filePath;
}
有什么问题？
编辑 1：
然后我使用以下代码：
public static String resizeAndCompressImageBeforeSend(Context context,String filePath,String fileName){
final int MAX_IMAGE_SIZE = 700 * 1024; // max final file size in kilobytes
// First decode with inJustDecodeBounds=true to check dimensions of image
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filePath,options);
// Calculate inSampleSize(First we are going to resize the image to 800x800 image,in order to not have a big but very low quality image.
//resizing the image will already reduce the file size,but after resizing we will check the file size and start to compress image
options.inSampleSize = calculateInSampleSize(options,800,800);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
options.inPreferredConfig= Bitmap.Config.ARGB_8888;
Bitmap bmpPic = BitmapFactory.decodeFile(filePath,options);
//Log.e("ds","dsadsadasda 222222 byteSizeOfBitmap(realImage) = "+byteSizeOfBitmap(bmpPic) );
int compressQuality = 100; // quality decreasing by 5 every loop.
int streamLength;
do{
ByteArrayOutputStream bmpStream = new ByteArrayOutputStream();
Log.d("compressBitmap","Quality: " + compressQuality);
bmpPic.compress(Bitmap.CompressFormat.JPEG,compressQuality,bmpStream);
byte[] bmpPicByteArray = bmpStream.toByteArray();
streamLength = bmpPicByteArray.length;
compressQuality -= 5;
Log.d("compressBitmap","Size: " + streamLength/1024+" kb");
}while (streamLength >= MAX_IMAGE_SIZE);
try {
//save the resized and compressed file to disk cache
Log.d("compressBitmap","cacheDir: "+context.getCacheDir());
FileOutputStream bmpFile = new FileOutputStream(context.getCacheDir()+fileName);
bmpPic.compress(Bitmap.CompressFormat.JPEG,bmpFile);
bmpFile.flush();
bmpFile.close();
} catch (Exception e) {
Log.e("compressBitmap","Error on saving file");
}
//return the path of resized and compressed file
return context.getCacheDir()+fileName;
}
如函数名所指定的，在发送到服务器之前对图像进行调整大小和压缩
这就是为什么我需要文件路径
04-04 14:42:04.936 14793-14920/com.example.vh80705.myapplication6 W/System.err: java.lang.SecurityException: Permission Denial: reading com.miui.gallery.provider.galleryOpenProvider uri content://com.miui.gallery.open/raw/storage/emulated/0/Download/MellatMobileBank_Android.apk/junit/runner/logo.gif from pid=14793,uid=10251 requires the provider be exported,or grantUriPermission()
at android.os.Parcel.createException(Parcel.java:2074)
at android.os.Parcel.readException(Parcel.java:2042)
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:188)
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:140)
at android.content.ContentProviderProxy.query(ContentProviderNative.java:423)
at android.content.ContentResolver.query(ContentResolver.java:946)
at android.content.ContentResolver.query(ContentResolver.java:881)
at android.content.ContentResolver.query(ContentResolver.java:837)
at com.example.vh80705.myapplication6.B1_GeneralClasses.A8_GetFilePathFromURI.GetFilePathFromURI.getRealPathFromURI(GetFilePathFromURI.java:193)
at com.example.vh80705.myapplication6.B1_GeneralClasses.A8_GetFilePathFromURI.GetFilePathFromURI.getFullSizeImagePath(GetFilePathFromURI.java:241)
04-04 14:42:04.937 14793-14920/com.example.vh80705.myapplication6 W/System.err: at com.example.vh80705.myapplication6.B13_Network.HandleActionList.MultipleCommands.GetimageURIStringPath.GetimageURIStringPath_M2_Class.GetimageURIString_M2(GetimageURIStringPath_M2_Class.java:41)
at com.example.vh80705.myapplication6.B13_Network.HandleActionList.MultipleCommands.SendCommand_MultipleCommandsFromActionList.Handle_UploadImageCommand(SendCommand_MultipleCommandsFromActionList.java:823)
at com.example.vh80705.myapplication6.B13_Network.HandleActionList.MultipleCommands.SendCommand_MultipleCommandsFromActionList.access$100(SendCommand_MultipleCommandsFromActionList.java:79)
at com.example.vh80705.myapplication6.B13_Network.HandleActionList.MultipleCommands.SendCommand_MultipleCommandsFromActionList$1.doWork(SendCommand_MultipleCommandsFromActionList.java:208)
at com.example.vh80705.myapplication6.B13_Network.HandleActionList.MultipleCommands.SendCommand_MultipleCommandsFromActionList$1.doWork(SendCommand_MultipleCommandsFromActionList.java:191)
at needle.UiRelatedTask.run(UiRelatedTask.java:20)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:919)
编辑 3： 上面的权限拒绝可见于以下代码行：
cursor = context.getContentResolver().query(contentUri,null);
编辑 4：
我尝试使用 openinputstream 而不是如评论中建议的那样使用文件路径，但同样的错误再次出现如下：
java.lang.SecurityException: Permission Denial: reading com.miui.gallery.provider.galleryOpenProvider uri content://com.miui.gallery.open/raw/storage/emulated/0/WhatsApp/Media/WhatsApp Images/IMG-20210404-WA0000.jpg from pid=30633,or grantUriPermission()
在线：
mInputStream = context.getContentResolver().openInputStream(mURI);
新代码如下：
public static String resizeAndCompressImageBeforeSend_ScopedStorage(Context context,Uri mURI,String fileName){
final int MAX_IMAGE_SIZE = 700 * 1024; // max final file size in kilobytes
// First decode with inJustDecodeBounds=true to check dimensions of image
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
//BitmapFactory.decodeFile(filePath,options);
// Calculate inSampleSize(First we are going to resize the image to 800x800 image,in order to not have a big but very low quality image.
//resizing the image will already reduce the file size,but after resizing we will check the file size and start to compress image
options.inSampleSize = calculateInSampleSize(options,800);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
options.inPreferredConfig= Bitmap.Config.ARGB_8888;
Log.e("ddsds","qqqwwweeerrr 2.1:"+mURI);
//////Bitmap bmpPic = BitmapFactory.decodeFile(filePath,options);
InputStream mInputStream;
try
{
mInputStream = context.getContentResolver().openInputStream(mURI);
Log.e("ddsds","qqqwwweeerrr 2.2:"+mInputStream);
} catch (Exception e) {
Log.e("ddsds","qqqwwweeerrr 3.1111111111"+e);
e.printstacktrace();
return null;
}
Bitmap bmpPic = BitmapFactory.decodeStream(mInputStream,options);
Log.e("ddsds","qqqwwweeerrr 3.1");
//Log.e("ds","dsadsadasda 222222 byteSizeOfBitmap(realImage) = "+byteSizeOfBitmap(bmpPic) );
int compressQuality = 100; // quality decreasing by 5 every loop.
int streamLength;
do{
ByteArrayOutputStream bmpStream = new ByteArrayOutputStream();
Log.d("compressBitmap","Quality: " + compressQuality);
bmpPic.compress(Bitmap.CompressFormat.JPEG,"Error on saving file");
}
//return the path of resized and compressed file
Log.e("ddsds","qqqwwweeerrr 6.1"+context.getCacheDir()+fileName);
return context.getCacheDir()+fileName;
}
解决方法
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