错误：java.lang.ArrayIndexOutOfBoundsException？

Question

我尝试保存具有图像类型的油漆。然后将图像转换为位图以保存SQLite数据库。我在“位图位图= BitmapFactory.decodeByteArray（paint，100，paint.length）;”行上收到错误“ java.lang.ArrayIndexOutOfBoundsException”。我该如何解决？

CanvasActivity.java

buttonSave.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            relativeLayout.setDrawingCacheEnabled(true);
            Bitmap bitmap = relativeLayout.getDrawingCache();
            ByteArrayOutputStream byteArray = new ByteArrayOutputStream();
            bitmap.compress(Bitmap.CompressFormat.PNG, 100, byteArray);
            byte[] paint = byteArray.toByteArray();

            MainActivity.database.Insert_Item(editTextName.getText().toString().trim(), paint);
            Toast.makeText(CanvasActivity.this, "Added a paint.", Toast.LENGTH_SHORT).show();
            startActivity(new Intent(CanvasActivity.this, MainActivity.class));
        }
    });

PaintAdapter.java

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder viewHolder;

    // Initialize view and mapping
    if (convertView == null) {
        viewHolder = new ViewHolder();
        LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = layoutInflater.inflate(layout, null);

        viewHolder.textViewName = (TextView) convertView.findViewById(R.id.textViewName);
        viewHolder.imageView = (ImageView) convertView.findViewById(R.id.imageView);

        convertView.setTag(viewHolder);
    } else {
        viewHolder = (ViewHolder) convertView.getTag();
    }

    // Set items
    PaintItem paintItem = itemList.get(position);

    viewHolder.textViewName.setText(paintItem.getName());
    // Convert byte[] -> bitmap
    byte[] paint = paintItem.getPaint();
    Bitmap bitmap = BitmapFactory.decodeByteArray(paint, 100, paint.length);
    viewHolder.imageView.setImageBitmap(bitmap);

    return convertView;
}

Answer 1

我认为可能是由1.油漆引起的。 2. paint小于100个字节，因此当偏移量要从100位置开始时会出现此错误。 您确定您的绘画文件已完整提供给decodeByteArray吗？

Answer 2

我建议您通过以下方式将图像保存到数据库：图像到base64代码， base64 utils在android.util

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