java - 无法从编辑文本小部件 (android) 获取文本

Question

我不知道我做错了什么，但是当我从编辑文本打印文本时(使用 getText().toString())，在 logcat 中它始终是一个空字符串。我想知道这是否与它在继续按钮的 onClick 函数中完成有关。我将整个 onCreate 函数放在一起，因为 onClick 函数中的代码似乎与无数教程中显示的内容完全匹配。

@Override
protected void onCreate(Bundle savedInstanceState)
{

  Button   add_test    = new Button(this);
  Button   delete_test = new Button(this);
  Button[] barray      = new Button[100];
  int      trans_grey  = Color.parseColor("#40000000");
  final String[] test_types  = new String[] {"Choose...","Terms", "Multiple choice", "Custom"};
  final ArrayAdapter<String> type_adapter = new ArrayAdapter<String>(this,R.layout.spinner_item,test_types);

  // Preliminary operations and display opening layouts
  requestWindowFeature(Window.FEATURE_NO_TITLE);
  getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
  WindowManager.LayoutParams.FLAG_FULLSCREEN);
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_test);
  LinearLayout  scroll_layout = (LinearLayout)findViewById(R.id.scroll_layout);
  LayoutParams  scroll_params = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                                                           LayoutParams.WRAP_CONTENT);


  // Add the add a dynamic button
  for (int index = 0; index <= 4; index++)
  {
      barray[index] = new Button(this);
      barray[index].setBackgroundColor(trans_grey);
      barray[index].setText("Array buttons");
      barray[index].setTextColor(Color.parseColor("#CCffffff"));
      scroll_layout.addView(barray[index], scroll_params);
  }


  add_test.setTextColor(Color.parseColor("#CCffffff"));
  add_test.setBackgroundColor(trans_grey);
  add_test.setText("Add a Test");
  scroll_layout.addView(add_test, scroll_params);
  add_test.setOnClickListener(new View.OnClickListener()
     {@Override
      public void onClick(View v)
      {

         AlertDialog.Builder add_test_builder = new AlertDialog.Builder(TestActivity.this);
         final View add_test_view = getLayoutInflater().inflate(R.layout.add_test_menu, null);
         Spinner  type_spinner   = (Spinner)  add_test_view.findViewById(R.id.type);
         add_test_builder.setView(add_test_view);
         final Button continue_button = (Button) add_test_view.findViewById(R.id.continue_button);
         AlertDialog dialog = add_test_builder.create();
         dialog.show();
         dialog.getWindow().setLayout(950,900);

         type_spinner.setAdapter(type_adapter);
         continue_button.setOnClickListener(new View.OnClickListener()
         {
             @Override
             public void onClick(View v)
             {
                View add_test_view = getLayoutInflater().
                       inflate(R.layout.add_test_menu, null);
                       // The view of the test attribute dialog
                EditText test_title     = (EditText) add_test_view.
                                       findViewById(R.id.testTitle);
                       // Test title widget to hold title of test
                String   user_title     = test_title.getText().toString();
                 Log.i(TAG, "onClick: " + user_title);

             }
         });
         return;
      }
     });

  // Add the delete a test button
  delete_test.setTextColor(Color.parseColor("#CCffffff"));
  delete_test.setBackgroundColor(trans_grey);
  delete_test.setText("Delete a Test");
  scroll_layout.addView(delete_test, scroll_params);


  return;
  }

}

布局:

<EditText
android:id="@+id/testTitle"
android:maxLines="1"
android:lines="1"
android:inputType="textAutoCorrect"
android:layout_width="match_parent"
android:layout_height="35dp"
android:background="#00000000"
android:hint="Test Title"/>

Answer 1

不要多次膨胀您分配给对话框的 View ，因为您正在创建它的多个实例，您正在写入一个 View 但试图从另一个 View 获取数据....尝试这样做......

AlertDialog.Builder add_test_builder = new AlertDialog.Builder(TestActivity.this);

final View add_test_view = getLayoutInflater().inflate(R.layout.add_test_menu, null); 

final EditText test_title = (EditText) add_test_view. findViewById(R.id.testTitle);

 continue_button.setOnClickListener(new View.OnClickListener() { 

@Override public void onClick(View v) {
   String user_title = test_title.getText().toString();
 Log.i(TAG, "onClick: " + user_title); } });