如何显示来自ArrayList的图像 <Bitmap> （SQLlte）

Question

I have this problem where i can not show images (bitmap) from my database in a list on my android studio application.

I can make a picture and save it (base64) in my database and retrieve it. But i cannot figure out how to show al the images on a display.

I tried to do it with a list adaptor but that doesnt work :/

 ArrayList<Bitmap> listData = new ArrayList<>();

        while(data.moveToNext()){
            //get the value from the database in column 1
            //then add it to the ArrayList

            byte [] encodeByte =Base64.decode(data.getString(1),Base64.DEFAULT);
            BitmapFactory.Options bmOptions = new BitmapFactory.Options();
            Bitmap bitmap =BitmapFactory.decodeByteArray(encodeByte, 0, encodeByte.length);
            listData.add(bitmap);
        }

Answer 1

This is the shortcut way to show multiple view depending on the size of listData .

First add LinearLayout in your_current_activity.xml .

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/linearLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    tools:context=".MainActivity">

</LinearLayout>

In java class

   LinearLayout linearLayout = findViewById(R.id.linearLayout);
   ArrayList<Bitmap> listData = new ArrayList<>();

    for (Bitmap a : listData) {
        ImageView image = new ImageView(this);
        image.setLayoutParams(new android.view.ViewGroup.LayoutParams(80, 60));
        image.setMaxHeight(20);
        image.setMaxWidth(20);
        image.setImageBitmap(a);
        linearLayout.addView(image);
      }

Below is my output (Assume I have 5 images in listData)