android：将内部存储映像复制到ImageView？

Question

将图像从资产目录复制到内部存储目录，并使用Android Studio的设备文件资源管理器在目录中成功找到新图像。但是UI是空白的。我在这里想念什么？

public class MainActivity extends AppCompatActivity {

    Context context;
    private final String assetImage = "qtest1.png";
    boolean isDirectoryCreated;
    private ImageView myImageView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        myImageView = findViewById(R.id.imageview);

        context = getApplicationContext();
        AssetManager assetManager = this.getAssets();
        InputStream in = null;
        OutputStream out = null;

        try {
            in = assetManager.open(assetImage);
            File dir = new File(context.getFilesDir().getAbsolutePath());
            isDirectoryCreated = dir.mkdirs();
            out = new FileOutputStream(dir + File.separator + "qtest1InStor.png");
            copyFile(in, out);
        } catch (IOException e) {
            //
        }
        finally {
            if (in != null) {
                try {
                   in.close();
                } catch (IOException e) {
                    // NOOP
                }
            }
            if (out != null) {
                try {
                    out.flush();
                    out.close();
                } catch (IOException e) {
                    // NOOP
                }
            }
         }

         File imgInStor = new File(context.getFilesDir().getAbsolutePath() + File.separator + "qtest1InStor.png");
         if (imgInStor.exists()) {
             Bitmap bitmap = BitmapFactory.decodeFile(imgInStor.getAbsolutePath());
             myImageView.setImageBitmap(bitmap);
         }
    }

    private void copyFile(InputStream in, OutputStream out) throws IOException {

        byte[] buffer = new byte[1024];
        int read;
        while((read = in.read(buffer)) != -1){
            out.write(buffer, 0, read);
        }
    }
}    

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout

    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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ImageView
        android:id="@+id/imageview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:contentDescription="testpng" />

</androidx.constraintlayout.widget.ConstraintLayout>