安卓开发 BitmapFactory.decodeByteArray返回为null

Question

安卓开发 BitmapFactory.decodeByteArray返回为null

  //从sqlite读取图片
   Cursor query = readableDatabase.query("tb_press", null, null, null, null, null, null);
   byte[] bytes = query.getBlob(1);
   
    Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);

    SQLiteDatabase db = dbOpenHelper.getWritableDatabase();
    
    //写入sqlite
    ContentValues values = new ContentValues();

    Bitmap bit = BitmapFactory.decodeResource(getResources(), R.drawable.new3);

    int size=bit.getWidth()*bit.getHeight()*4;

    ByteArrayOutputStream os = new ByteArrayOutputStream(size);

    bit.compress(Bitmap.CompressFormat.PNG, 100, os);

    values.put("imgae", os.toByteArray());

    long insert = db.insert("tb_press", null, values);

将图片存入sqlite并从中读出

读取图片存放到imageview上

Answer 1

看下读取的byte数据是否为null，或者转换过程中有异常