选择时使用 retrofit2 获得的项目不会显示在微调器中

Question

项目最初不显示在微调器上too.When点击微调器我们可以看到它被填充并且从网络获取数据api（json数组）使用 retrofit2 shown.The 所选项目既未显示在微调器上也未设置为编辑文本。

代码：

public class BranchsActivity extends AppCompatActivity {
Button br_add;
String brName,brShortName;
EditText et_BrName,et_BrShName;
Spinner spinner_Branch;
List<BranchResponse> branch;
Integer brId;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_branchs);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    getSupportActionBar().setDisplayShowHomeEnabled(true);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    br_add = (Button)findViewById(R.id.bt_bradd);
    et_BrName = (EditText)findViewById(R.id.editTextBrName);
    et_BrShName = (EditText)findViewById(R.id.editTextBrShName);
    spinner_Branch = (Spinner)findViewById(R.id.spinner_br);
    final ArrayList<String> brList = new ArrayList<>();


            Callback <List<BranchResponse>> callback = new Callback<List<BranchResponse>>() {
                @Override
                public void onResponse(Response<List<BranchResponse>> response, Retrofit retrofit) {
                    if (response.isSuccess()) {
                         branch = response.body();
                        brList.clear();
                        for(int i=0;i<branch.size();i++){
                            brName= branch.get(i).getBrName();
                            brShortName = branch.get(i).getBrShortName();
                            brId = branch.get(i).getBranchId();
                            brList.add(brName);

                        }
                        brList.add(0,"Select a Branch");
                        Toast.makeText(getApplicationContext(), "Successful!", Toast.LENGTH_SHORT).show();

                    }else
                        Toast.makeText(getApplicationContext(), response.raw().message().toString(), Toast.LENGTH_SHORT).show();
                }

                @Override
                public void onFailure(Throwable t) {
                    Toast.makeText(getApplicationContext(), "failure!", Toast.LENGTH_SHORT).show();

                }
            };
            ApiManager.getApi().getService().getBranch().enqueue(callback);


    spinner_Branch.setAdapter(new ArrayAdapter<String>(BranchsActivity.this,android.R.layout.simple_spinner_dropdown_item, brList));
    spinner_Branch.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener(){
    @Override
    public void onItemSelected(AdapterView<?>parent,View view,int position,long id){
 //This toast is also not shown when the item is selected
        Toast.makeText(getApplicationContext(), "item selected!", Toast.LENGTH_SHORT).show();
        et_BrName.setText(branch.get(position).getBrName());
        et_BrShName.setText(branch.get(position).getBrShortName());
        Toast.makeText(parent.getContext(),
                "On Item Select : \n" + parent.getItemAtPosition(position-1).toString(),
                Toast.LENGTH_LONG).show();
 }
        @Override
        public void onNothingSelected(AdapterView<?>arg0){


        }
    });

}

我浏览了几乎所有处理微调器问题的帖子并尝试了所有建议的答案，但 none 解决了这个问题。

Answer 1

ArrayAdapter<String> mAdapter;
mAdapter = new ArrayAdapter<String>(BranchsActivity.this,android.R.layout.simple_spinner_dropdown_item, brList);
spinner_Branch.setAdapter(mAdapter);

Callback <List<BranchResponse>> callback = new Callback<List<BranchResponse>>() {
            @Override
            public void onResponse(Response<List<BranchResponse>> response, Retrofit retrofit) {
                if (response.isSuccess()) {
                     branch = response.body();
                    brList.clear();
                    for(int i=0;i<branch.size();i++){
                        brName= branch.get(i).getBrName();
                        brShortName = branch.get(i).getBrShortName();
                        brId = branch.get(i).getBranchId();
                        brList.add(brName);

                    }

                    brList.add(0,"Select a Branch");
                    mAdapter.notifydatasetchanged();
                    Toast.makeText(getApplicationContext(), "Successful!", Toast.LENGTH_SHORT).show();

                }else
                    Toast.makeText(getApplicationContext(), response.raw().message().toString(), Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onFailure(Throwable t) {
                Toast.makeText(getApplicationContext(), "failure!", Toast.LENGTH_SHORT).show();

            }
        };
        ApiManager.getApi().getService().getBranch().enqueue(callback);

选择时使用 retrofit2 获得的项目不会显示在微调器中

Items obtained using retrofit2 when selected, is not shown in the spinner

android

spinner

retrofit2