java - 我无法使用从 Activity 传递到 fragment 的 bundle 字符串数据在 textView 中设置文本

Question

Data pass from ProjectDetailActivity to ProjectDetailFragment ,I already check that data can pass to fragment by using Toast to show data as you can see in the code , but the problem is I cant set text in Textview by using data from bundle . If you see some error in this code please let me know . Thank a lot.

ProjectDetailActivity 类

         private String project_key,project_name,project_priority,project_category,
                        project_start_date ,project_end_date,project_description;
         @Override
         protected void onCreate(Bundle savedInstanceState) {
              super.onCreate(savedInstanceState);
              setContentView(R.layout.activity_project_detail);

              Intent intent = getIntent();
              project_key         = intent.getStringExtra("project_key");
              project_name        = intent.getStringExtra("project_name");
              project_category    = intent.getStringExtra("project_category");
              project_priority    = intent.getStringExtra("project_priority");

              Bundle bundle = new Bundle();
              bundle.putString("project_key",project_key);
              bundle.putString("project_name",project_name);
              bundle.putString("project_category",project_category);
              bundle.putString("project_priority",project_priority);

              ProjectDetailFragment project_detail_fragment =new ProjectDetailFragment();
              project_detail_fragment.setArguments(bundle);
              getSupportFragmentManager().beginTransaction()
                .replace(R.id.project_detail_fragment,project_detail_fragment)
                .commit();

          }
     }

ProjectDetailFragment 类

 public class ProjectDetailFragment extends Fragment {
      private View root;

      private String project_key,project_name,project_priority,project_category,


      private TextView project_name_textView , project_priority_textView ,
                       project_category_textView ;

      private Context mContext;

      public ProjectDetailFragment() { }

      @Override
      public void onCreate(@Nullable Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           if (getArguments() != null) {
                Bundle bundle = getArguments();
                project_key           = bundle.getString("project_key");
                project_name          = bundle.getString("project_name");
                project_priority      = bundle.getString("project_category");
                project_category      = bundle.getString("project_priority");
           }
      }

      public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle 
                  savedInstanceState) {
            root =  inflater.inflate(R.layout.fragment_project_detail, container,false);

            project_name_textView        = root.findViewById(R.id.project_name_textView);
            project_priority_textView    = root.findViewById(R.id.priority_textView);
            project_category_textView    = root.findViewById(R.id.category_textView);


            project_name_textView.setText(project_name);
            project_priority_textView.setText(project_priority);
            project_category_textView.setText(project_category);

            Toast.makeText(mContext,"TASK ACTIVITY\n"+
                    project_key+"\n"+project_name+"\n"+project_category+"\n"
                    +project_priority+"\n",Toast.LENGTH_SHORT).show();

            return root;
       }

       @Override
       public void onAttach(Context context) {
            super.onAttach(context);
            mContext=context;
       }
 }

Answer 1

如果Toast向您显示数据，则意味着接收数据没有问题，并且我在将数据设置为 TextView 时没有看到错误，但请检查您的xml，检查文本颜色是否与背景颜色匹配，例如text-view背景是白色的，文字颜色也是白色的，显然你看不到文字。 或者如果没有，你可以这样尝试::::project_name_textView.setText(String.value of(project_name));