无法读取写入文件的图像

Question

我正在尝试将图像写入存储然后读取它。写入操作成功但读取失败。我曾尝试在致电负责人 activity 时使用 intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION); 但无济于事。我是这样写图片的：

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;
}

我是这样看图的：

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 =

处遇到异常

MediaStore.Images.Media.getBitmap(context.getContentResolver(),
                Uri.parse(cursor.getString(cursor.getColumnIndex(eventDBcontract.ListofItem.columnpic))));

例外情况是：

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。

Answer 1

而不是 photoUri.toString() 将 image.getAbsolutePath() 放入您的数据库中。

如果要读取文件，请从数据库中获取路径。使用 FileInputStream 构造一个 File 对象。然后让BitmapFactory从流中读取数据。

无法读取写入文件的图像

Cannot read image written to file

android

android-fileprovider