Code example for KeyEvent

Methods: getActiongetKeyCodegetRepeatCountisCanceled

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        mActivity = activity;
    } 
 
    @Override 
    public boolean dispatchKeyEventPreIme(KeyEvent event) {
        if (event.getKeyCode() == KeyEvent.KEYCODE_BACK) {
            KeyEvent.DispatcherState state = getKeyDispatcherState();
            if (state != null) {
                if (event.getAction() == KeyEvent.ACTION_DOWN
                        && event.getRepeatCount() == 0) {
                    state.startTracking(event, this);
                    return true; 
                } else if (event.getAction() == KeyEvent.ACTION_UP
                        && !event.isCanceled() && state.isTracking(event)) {
                    mActivity.onBackPressed();
                    return true; 
                } 
            } 
        } 
        return super.dispatchKeyEventPreIme(event);
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