[Android] The OnKey event editText1 Why executed twice Toast? how to avoid

 This post last edited by the ilove8 on 2013-10-02 21:49:54

When editText1 nulls Enter key , suggesting not be empty, but why each displayed twice tips , track a bit, the onKey event executed twice.
main code is as follows

  editText1.setOnKeyListener(new View.OnKeyListener() {
    @Override
    public boolean onKey(View arg0, int arg1, KeyEvent arg2) {
      boolean bRet = false;
      String s = editText1.getText().toString();
      if(arg1==KeyEvent.KEYCODE_ENTER){
        if(s.length() == 0){
          ShowToast("不能为空");
  	        			
          bRet = true;
        }
      }
    return bRet;
  }        
  });

edit1Text text controls below there is a edit2Text

      <LinearLayout
          android:layout_width="match_parent"
          android:layout_height="wrap_content" >
  
          <EditText
              android:id="@+id/editText1"
              android:layout_width="0dip"
              android:layout_height="wrap_content"
              android:layout_weight="1"
              android:singleLine="true"
              android:ems="10" >
  
              <requestFocus />
          </EditText>
  
      </LinearLayout>
  
      <LinearLayout
          android:layout_width="match_parent"
          android:layout_height="wrap_content" >
  
          <EditText
              android:id="@+id/editText2"
              android:layout_width="0dip"
              android:layout_height="wrap_content"
              android:layout_weight="1"
              android:singleLine="true"
              android:ems="10" />
  
      </LinearLayout>
  

How to avoid prompted twice ? Thank
------ Solution ----------------------------- ---------------
click once on the Enter key , KeyEvent.ACTION_DOWN and KeyEvent.ACTION_UP are triggered View.OnKeyListener (), so Toast displayed twice. You can put

if(arg1==KeyEvent.KEYCODE_ENTER)

change

if(arg1==KeyEvent.KEYCODE_ENTER && arg2.getAction() == KeyEvent.ACTION_DOWN)

or

if(arg1==KeyEvent.KEYCODE_ENTER && arg2.getAction() == KeyEvent.ACTION_UP)

This will only press the ENTER key or release the ENTER key when the display Toast.
You may also need to be changed when press and release , Toast display different string.
------ eference ------------------------------------ ---

if(arg1==KeyEvent.KEYCODE_ENTER && arg2.getAction() == KeyEvent.ACTION_UP)

effective, thank you ah
plus you QQ, how much you look .
------ eference ---------------------------- -----------
Results posted !!