Android: Backspace in WebView/BaseInputConnection

Ok, finally figured this out.

In Android 4.2 (maybe in earlier versions as well) the backspace is not sent as a sendKeyEvent(..., KeyEvent.KEYCODE_DEL) by the standard soft keyboard. Instead, it is sent as deleteSurroundingText(1, 0).

So the solution in my case is to make a custom InputConnection with the following:

@Overridepublic boolean deleteSurroundingText(int beforeLength, int afterLength) {           // magic: in latest Android, deleteSurroundingText(1, 0) will be called for backspace    if (beforeLength == 1 && afterLength == 0) {        // backspace        return super.sendKeyEvent(new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DEL))            && super.sendKeyEvent(new KeyEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_DEL));    }    return super.deleteSurroundingText(beforeLength, afterLength);}

Note: Please let me know if I am doing something stupid here, as it is my 3rd day writing for Android.

this code will be better, it work with more keyboard :D

@Override  public InputConnection onCreateInputConnection(EditorInfo outAttrs) {      outAttrs.actionLabel = null;      outAttrs.inputType = InputType.TYPE_NULL;      final InputConnection con = new BaseInputConnection(this,false);      InputConnectionWrapper public_con = new InputConnectionWrapper(              super.onCreateInputConnection(outAttrs), true) {          @Override          public boolean deleteSurroundingText(int beforeLength, int afterLength) {              if (beforeLength == 1 && afterLength == 0) {                  return this.sendKeyEvent(new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DEL))                          && this.sendKeyEvent(new KeyEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_DEL));              }              return super.deleteSurroundingText(beforeLength, afterLength);          }          @Override          public boolean sendKeyEvent(KeyEvent event) {              if(event.getKeyCode() == KeyEvent.KEYCODE_DEL){                  return con.sendKeyEvent(event);              }else {                  return super.sendKeyEvent(event);              }          }      };      try {          return public_con ;      }catch (Exception e){          return super.onCreateInputConnection(outAttrs) ;      }  }