为什么我的ImageUri没有显示在setView的AlertDialogBox中？

Question

我有一个学生名单。我想要的是，当您长按选择的列表时，将使用警报对话框显示一个选项列表。选项为显示，编辑和删除。

当用户单击显示时，将弹出一个警报对话框，显示学生的所有详细信息。

从下面的代码中，唯一显示的是姓氏，名字和课程，但是我的图像（imageUri）将不会显示。

请在下面查看我的代码。谢谢！

MainActivity.java

    ArrayList<Student> studentArrayList = new ArrayList<>();
    CustomAdapter adapter;
    private Uri imageUri;
    ListView lv;
    AlertDialog.Builder options_builder, show_builder, edit_builder;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        lv = (ListView) findViewById(R.id.student_listview);

        adapter = new CustomAdapter(this, studentArrayList);
        adapter.notifyDataSetChanged();
        lv.setAdapter(adapter);

        lv.setOnItemClickListener(this);
        lv.setOnItemLongClickListener(this);

        //
        options_builder = new AlertDialog.Builder(this);
        show_builder = new AlertDialog.Builder(this);
        edit_builder = new AlertDialog.Builder(this);

    }

    //for menu
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();

        if(id == android.R.id.home){
            onBackPressed();
            return true;
        }else if(id == R.id.action_add){
            Intent add = new Intent(MainActivity.this, AddStudentActivity.class);
//            startActivity(add);
            startActivityForResult(add, 0);
        }
        return super.onOptionsItemSelected(item);
    }
    //inflate the menu

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.addmenu, menu);
        return super.onCreateOptionsMenu(menu);
    }

    //handles the onclick listener for the listview
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if(resultCode == Activity.RESULT_OK){
            Bundle b = data.getExtras();
            imageUri = b.getParcelable("image");
            String lastname = b.getString("lastname");
            String firstname = b.getString("firstname");
            String course = b.getString("course");

            Student student = new Student(imageUri, lastname, firstname, course);
            studentArrayList.add(student);
            adapter.notifyDataSetChanged();
        }else{

        }
    }

    //handles when the listview is long clicked
    @Override
    public boolean onItemLongClick(AdapterView<?> parent, View view, final int position, long id) {
//        final CharSequence[] options = {"Show", "Edit", "Delete"};

        //
        Student selectedStudents = studentArrayList.get(position);
        final Uri image = selectedStudents.getUriImage();
        final String lastname = selectedStudents.getStudlname();
        final String firstname = selectedStudents.getStudfname();
        final String course = selectedStudents.getStudcourse();
        final ImageView imageView = new ImageView(this);
        imageView.setImageURI(imageUri);

        options_builder.setTitle("Choose an option");
        String [] options = {"Show", "Edit", "Delete"};

        options_builder.setItems(options, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                switch (which){
                    case 0:
                        show_builder.setTitle(""+lastname+", "+firstname+"\n"+course);
                        show_builder.setView(imageView);
                        show_builder.setNeutralButton("Okay", null);

                        AlertDialog show_dialog = show_builder.show();
                        show_dialog.show();
                        break;
                    case 1:
                        Intent toedit = new Intent(MainActivity.this, AddStudentActivity.class);
                        startActivityForResult(toedit,0);
                        break;
                    case 2:
                        studentArrayList.remove(position);
                        adapter.notifyDataSetChanged();
                        Toast.makeText(getApplicationContext(), "Item removed!", Toast.LENGTH_SHORT).show();
                        break;
                }
            }
        });

        AlertDialog options_dialog = options_builder.show();
        options_dialog.show();



        return true;
    }