我正在尝试在存储上写入图像然后阅读它。写操作成功但读取失败。我在调用负责任的活动时尝试使用intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
但没有帮助。
这就是我写图像的方式:
public void savepic(Bitmap pic)
{
SQLiteDatabase db = dBcontract.getWritableDatabase();
ContentValues values = new ContentValues();
FileOutputStream out = null;
try
{
File image = createImageFile();
Uri photoURI = FileProvider.getUriForFile(context, "lcukerd.com.android.fileprovider", image);
out = new FileOutputStream(image);
pic.compress(Bitmap.CompressFormat.PNG, 100, out);
values.put(eventDBcontract.ListofItem.columnpic, photoURI.toString());
db.insert(eventDBcontract.ListofItem.tableName2, null, values);
Log.i(TAG, "Pic saved " + photoURI.toString());
} catch (Exception e)
{
e.printStackTrace();
} finally
{
try
{
if (out != null)
{
out.close();
}
} catch (IOException e)
{
e.printStackTrace();
}
}
}
private File createImageFile() throws IOException
{
String EName = "Image";
File storageDir = context.getExternalFilesDir(Environment.DIRECTORY_PICTURES);
File image = File.createTempFile(EName, ".jpg", storageDir);
return image;
}
这就是我读图片的方式:
public Bitmap getDownloadedpics(int index)
{
SQLiteDatabase db = dBcontract.getReadableDatabase();
Cursor cursor = db.query(eventDBcontract.ListofItem.tableName2, projection2, null, null, null, null, null);
cursor.moveToPosition(index);
Bitmap photo = null;
try
{
Log.d(TAG,cursor.getString(cursor.getColumnIndex(eventDBcontract.ListofItem.columnpic)));
photo = MediaStore.Images.Media.getBitmap(context.getContentResolver(),
Uri.parse(cursor.getString(cursor.getColumnIndex(eventDBcontract.ListofItem.columnpic))));
} catch (IOException e)
{
Log.e(TAG, "Can't read image");
}
Log.d(TAG, "Returned " + String.valueOf(cursor.getCount()) + " pics");
return (photo);
}
我在`photo =
得到了例外MediaStore.Images.Media.getBitmap(context.getContentResolver(),
Uri.parse(cursor.getString(cursor.getColumnIndex(eventDBcontract.ListofItem.columnpic))));
例外是:
java.lang.SecurityException: Permission Denial: opening provider android.support.v4.content.FileProvider from ProcessRecord{6118b35 21772:lcukerd.com.instaswipe/u0a157} (pid=21772, uid=10157) that is not exported from uid 10101
我已经检查了其他类似的问题,但似乎它们都是针对其他类型的问题。帮我解决一下。
答案 0 :(得分:0)
而不是photoUri.toString()将image.getAbsolutePath()放入数据库。
如果要读取文件,请从数据库中获取路径。使用FileInputStream构造File对象。然后让BitmapFactory从流中读取数据。