@Override 
  public boolean dispatchKeyEvent(KeyEvent event) { 
    if(event.getKeyCode() == KeyEvent.KEYCODE_ENTER){ 
      /*隐藏软键盘*/ 
      InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE); 
      if(inputMethodManager.isActive()){ 
        inputMethodManager.hideSoftInputFromWindow(MainActivity.this.getCurrentFocus().getWindowToken(), 0); 
      } 
       
      edittext.setText("success"); 
      webview.loadUrl(URL); 
      return true; 
    } 
    return super.dispatchKeyEvent(event); 
  } 

private OnKeyListener onKeyListener = new OnKeyListener() { 
     
    @Override 
    public boolean onKey(View v, int keyCode, KeyEvent event) { 
      if(keyCode == KeyEvent.KEYCODE_ENTER && event.getAction() == KeyEvent.ACTION_DOWN){ 
        /*隐藏软键盘*/ 
        InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE); 
        if(inputMethodManager.isActive()){ 
          inputMethodManager.hideSoftInputFromWindow(v.getApplicationWindowToken(), 0); 
        } 
         
        edittext.setText("success"); 
        webview.loadUrl(URL); 
         
        return true; 
      } 
      return false; 
    } 
  }; 

edittext.setOnKeyListener(onKeyListener); 

edittext.setOnEditorActionListener(new TextView.OnEditorActionListener() { 
       
      @Override 
      public boolean onEditorAction(TextView v, int actionId, KeyEvent event) { 
        /*判断是否是“GO”键*/ 
        if(actionId == EditorInfo.IME_ACTION_GO){ 
          /*隐藏软键盘*/ 
          InputMethodManager imm = (InputMethodManager) v 
              .getContext().getSystemService( 
                  Context.INPUT_METHOD_SERVICE); 
          if (imm.isActive()) { 
            imm.hideSoftInputFromWindow( 
                v.getApplicationWindowToken(), 0); 
          } 
           
          edittext.setText("success"); 
          webview.loadUrl(URL); 
           
          return true; 
        } 
        return false; 
      } 
    }); 

<EditText 
    android:id="@+id/edittext" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:singleLine="true" 
    android:imeOptions="actionSearch"/>