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@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        Toast.makeText(this, "Back button pressed", Toast.LENGTH_SHORT).show();
        return true; // 杩斿洖true琛ㄧず宸插鐞嗘寜閿簨浠?/span>
    }
    return super.onKeyDown(keyCode, event);
}

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璇锋敞鎰忥紝onKeyDown() 鏂规硶杩斿洖涓€涓猙oolean鍊硷紝鐢ㄤ簬鎸囩ず鏄惁宸插鐞嗘寜閿簨浠躲€傚鏋滄偍甯屾湜鍦ㄦ寜涓嬫寜閿悗缁х画鎵ц榛樿鐨勬寜閿鐞嗘搷浣滐紝璇疯繑鍥瀞uper.onKeyDown()銆傚鏋滄偍甯屾湜闃绘榛樿鐨勬寜閿鐞嗘搷浣滃苟鑷澶勭悊鎸夐敭浜嬩欢锛岃杩斿洖true銆?/p>