获取按键键值的工具类

获取当前按下的按键键值，直接新建工程，把这段代码放到主Activity里就行了。

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/** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);//        setContentView(R.layout.main);                LinearLayout ll = new LinearLayout(this);        ll.setBackgroundColor(Color.BLUE);        ll.setOrientation(LinearLayout.VERTICAL);                TextView tv = new TextView(this);        tv.setText("键值测试程序，请按键开始测试");        tv.setTextColor(Color.RED);        ll.addView(tv);                tv2 = new TextView(this);        tv2.setTextColor(Color.RED);        ll.addView(tv2);                this.setContentView(ll);            }        TextView tv2;    @Override    public boolean onKeyDown(int keyCode, KeyEvent event) {        tv2.setText("您按下的按键的键值是："+keyCode);                return super.onKeyDown(keyCode, event);    }