c#中如何用listview显示图片

Question

看了一个教程，我有一个 listView.

我有一个 EditText 并希望通过EditText中的内容过滤listView的内容。

这是我的适配器类。

class ListViewAdapter extends BaseAdapter {
    private List<listAudienceFriendsExcept> FriendsExceptList;
    private Context context;
    ListViewAdapter(Context context, List<listAudienceFriendsExcept> FriendsExceptList) {
        this.context = context;
        this.FriendsExceptList = FriendsExceptList;
    }
    @Override
    public int getCount() {
        return FriendsExceptList.size();
    }
    @Override
    public Object getItem(int pos) {
        return FriendsExceptList.get(pos);
    }
    @Override
    public long getItemId(int pos) {
        return pos;
    }
    @SuppressLint("ViewHolder")
    @Override
    public View getView(int position, View view, ViewGroup viewGroup) {
        view = LayoutInflater.from(context).inflate(R.layout.model,viewGroup,false);

        TextView name = view.findViewById(R.id.name);
        ImageView avatar = view.findViewById(R.id.avatar);
        final CheckBox checkbox = view.findViewById(R.id.checkbox);

        final listAudienceFriendsExcept thisListAudienceFriendsExcept = FriendsExceptList.get(position);

        // Setting data to listView items
        checkbox.setTag(thisListAudienceFriendsExcept.getId());
        name.setText(thisListAudienceFriendsExcept.getGetFirstName());
        if (!thisListAudienceFriendsExcept.getGetAvatar().equals("default_avatar.png")) {
            Glide.with(avatar)
                    .load(API_BASE_URL+"files/avatar_back_files/"+thisListAudienceFriendsExcept.getGetAvatar())
                    .circleCrop()
                    .fitCenter()
                    .into(avatar);
        } else if (thisListAudienceFriendsExcept.getGetSex().equals("male")) {
            Glide.with(avatar)
                    .load(API_BASE_URL+"tools/img/default_avatar.png")
                    .circleCrop()
                    .fitCenter()
                    .into(avatar);
        } else {
            Glide.with(avatar)
                    .load(API_BASE_URL+"tools/img/female_default_avatar.png")
                    .circleCrop()
                    .fitCenter()
                    .into(avatar);
        }
        return view;
    }
}

这里是我的list，这里是我的populateListView：

static class listAudienceFriendsExcept {
    @SerializedName("id")
    private int id;
    @SerializedName("first_name")
    private String first_name;
    @SerializedName("last_name")
    private String last_name;
    @SerializedName("avatar")
    private String avatar;
    @SerializedName("sex")
    private String sex;

    public listAudienceFriendsExcept(int id, String first_name, String last_name, String avatar, String sex) {
        this.id = id;
        this.first_name = first_name;
        this.last_name = last_name;
        this.avatar = avatar;
        this.sex = sex;
    }
    int getId() {
        return id;
    }
    String getGetFirstName() {
        return first_name;
    }
    String getGetLastName() {
        return last_name;
    }
    String getGetAvatar() {
        return avatar;
    }
    String getGetSex() {
        return sex;
    }
}

这里是我的populateListView:

private void populateListView(List<listAudienceFriendsExcept> thisList) {
    ListView listViewAudienceFriendsExcept = findViewById(R.id.listViewAudienceFriendsExcept);
    ListViewAdapter adapter = new ListViewAdapter(this, thisList);
    listViewAudienceFriendsExcept.setAdapter(adapter);
}

我试过了

final TextInputEditText first_name_edit_text = findViewById(R.id.first_name_edit_text);


    first_name_edit_text.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
        public void onTextChanged(CharSequence cs, int s, int b, int c) {

              friendListAdapter.getFilter().filter(newText); // What is **friendListAdapter** in my case ?
        }

我使用Retrofit在活动开始时从服务器获取数据。

private void callServer() {
    /*Create handle for the RetrofitInstance interface*/
    df myAPIService = RetrofitClientInstance.getRetrofitInstance().create(df.class);

    Call<List<listAudienceFriendsExcept>> call = myAPIService.getListAudienceFriendsExcept();
    call.enqueue(new Callback<List<listAudienceFriendsExcept>>() {

        @SuppressWarnings("NullableProblems")
        @Override
        public void onResponse(Call<List<listAudienceFriendsExcept>> call, Response<List<listAudienceFriendsExcept>> response) {
             populateListView(response.body());
        }
        @SuppressWarnings("NullableProblems")
        @Override
        public void onFailure(Call<List<listAudienceFriendsExcept>> call, Throwable throwable) {
             Toast.makeText(MainActivity.this, throwable.getMessage()+"èèè", Toast.LENGTH_LONG).show();
        }
    });
}

我查了一下，发现 friendListAdapter.getFilter().filter(newText)。 但我不知道在我的情况下如何使用。

有什么解决办法吗？

我的另一个问题。我怎样才能把用户ID传给php服务器？

谢谢。

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c#中如何用listview显示图片