Question

当用户与Android应用程序交互时，如何在按下按钮之前存储用户输入的值？这是我们编写的代码。请告诉我们如何纠正它：

public class configroom extends Activity {

    public String nroom;

    @override
    protected void onCreate (Bundle savedInstanceState) {

      super.onCreate(savedInstanceState);

      setContentView(R.layout.activity_config_room);

      Button nextBtn = (Button) findViewById(R.id.nextbtn1);

      nextBtn.setOnClickListener(new View.OnClickListener(){

          @override

          public void onClick (View v) {

               getnumrooms(nroom);

               Intent i = new Intent (ConfigRoom.this, ConfigRoom2.class);

               i.putExtra("NumOfRooms",nroom);

               startActivityForResult(i,0);

          }
     });
    }

      void getnumrooms(String nroom) {

            EditText numberDisplay = (EditText) findViewById(R.id.numrm1);
            nroom = (numberDisplay.getText().toString());

      }

      @override
      public boolean onCreateOptionsMenu (Menu menu) {
            getMenuInflater().inflate(R.menu.activity_config_room1,menu);
            return true;
      }
  }

Answer 1

我不确定这是否是“按下按钮之前”的意思，但您可以使用TextChangedListener。

这或多或少看起来像这样：

EditText numberDisplay = (EditText) findViewById(R.id.numrm1);
numberDisplay.addTextChangedListener(new TextWatcher(){
     public void afterTextChanged(Editable s) {
           nroom = (s.getText().toString());
     }
     public void beforeTextChanged(CharSequence s, int start, int count, int after){}
     public void onTextChanged(CharSequence s, int start, int before, int count){}
}

Answer 2

在您的edittext上应用focuschangelistener

txtEdit.setOnFocusChangeListener(new OnFocusChangeListener() {          

    public void onFocusChange(View v, boolean hasFocus) {
        if(!hasFocus)
           //do job here owhen Edittext lose focus 
    }
});

希望它能满足您的目的

Answer 3

在android

中使用 sharedprefernces

public class configroom extends Activity {

public String nroom;
SharedPreferences sharedpreferences;

@override
protected void onCreate (Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  setContentView(R.layout.activity_config_room);

  Button nextBtn = (Button) findViewById(R.id.nextbtn1);
  getnumrooms();
  nextBtn.setOnClickListener(new View.OnClickListener(){

      @override

      public void onClick (View v) {

           String nroom=sharedpreferences.getString("room",""); 

           Intent i = new Intent (ConfigRoom.this, ConfigRoom2.class);

           i.putExtra("NumOfRooms",nroom);

           startActivityForResult(i,0);

      }
 });
}

  void getnumrooms() {

        EditText numberDisplay = (EditText) findViewById(R.id.numrm1);
        nroom = (numberDisplay.getText().toString());
        sharedpreferences = getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);
        Editor editor = sharedpreferences.edit();
   editor.putString("room", nroom);
   editor.commit();

  }

  @override
  public boolean onCreateOptionsMenu (Menu menu) {
        getMenuInflater().inflate(R.menu.activity_config_room1,menu);
        return true;
  }

}

如何在开发eclipse的android应用程序中接受用户的值？

3 个答案: