public class MainActivity extends Activity {

	private SafeEditView pwdSEV;
	private Button loginBT; 
    private boolean run = true;
    private int id = 0;

    private PopupWindow popupWindow;
    private KeyboardView mInputView;
    private Keyboard mQwertyKeyboard;
    View view;
    boolean is = false;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		//pwdSEV = (SafeEditView)findViewById(R.id.passwd);

		loginBT = (Button)findViewById(R.id.loginbt);

		loginBT.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub

				if(!is){
					popupWindow.setBackgroundDrawable(new BitmapDrawable());              
	                popupWindow.setFocusable(false);
	                popupWindow.setTouchable(true);

					popupWindow.showAtLocation(view, Gravity.BOTTOM, 0, 0);
					//popupWindow.showAsDropDown(view); 
	                popupWindow.setOutsideTouchable(true); 
				}else{
					popupWindow.dismiss();
				}
				is = !is;
			}
		});

		mQwertyKeyboard = new Keyboard(getApplicationContext(), R.xml.qwerty);
		view = LayoutInflater.from(MainActivity.this).inflate(
                R.layout.safe_keyboard, null);
		mInputView = (KeyboardView) view.findViewById(R.id.keyboard_view);
		mInputView.setKeyboard(mQwertyKeyboard);
		popupWindow = new PopupWindow(view,
                LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, false);

		//设置可以获取焦点，否则弹出菜单中的EditText是无法获取输入的
		popupWindow.setFocusable(true);
	    //这句是为了防止弹出菜单获取焦点之后，点击activity的其他组件没有响应
		popupWindow.setBackgroundDrawable(new BitmapDrawable());

	}

	@Override
	protected void onResume() {
		// TODO Auto-generated method stub
		super.onResume();
	}

}

代码如上，自定义键盘可以弹出来，但是一点击就会出现下面的报错，哪位帮忙解答一下。  换个布局就不会出错。

04-07 14:40:07.725: E/AndroidRuntime(19100): java.lang.NullPointerException
04-07 14:40:07.725: E/AndroidRuntime(19100): 	at android.inputmethodservice.KeyboardView.onModifiedTouchEvent(KeyboardView.java:1211)
04-07 14:40:07.725: E/AndroidRuntime(19100): 	at android.inputmethodservice.KeyboardView.onTouchEvent(KeyboardView.java:1151)
04-07 14:40:07.725: E/AndroidRuntime(19100): 	at android.view.View.dispatchTouchEvent(View.java:3939)
04-07 14:40:07.725: E/AndroidRuntime(19100): 	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:902)
04-07 14:40:07.725: E/AndroidRuntime(19100): 	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:902)
04-07 14:40:07.725: E/AndroidRuntime(19100): 	at android.widget.PopupWindow$PopupViewContainer.dispatchTouchEvent(PopupWindow.java:1521)
04-07 14:40:07.725: E/AndroidRuntime(19100): 	at android.view.ViewRoot.deliverPointerEvent(ViewRoot.java:2364)
04-07 14:40:07.725: E/AndroidRuntime(19100): 	at android.view.ViewRoot.handleMessage(ViewRoot.java:2022)
04-07 14:40:07.725: E/AndroidRuntime(19100): 	at android.os.Handler.dispatchMessage(Handler.java:130)
04-07 14:40:07.725: E/AndroidRuntime(19100): 	at android.os.Looper.loop(Looper.java:384)
04-07 14:40:07.725: E/AndroidRuntime(19100): 	at android.app.ActivityThread.main(ActivityThread.java:3971)
04-07 14:40:07.725: E/AndroidRuntime(19100): 	at java.lang.reflect.Method.invokeNative(Native Method)
04-07 14:40:07.725: E/AndroidRuntime(19100): 	at java.lang.reflect.Method.invoke(Method.java:538)
04-07 14:40:07.725: E/AndroidRuntime(19100): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:978)
04-07 14:40:07.725: E/AndroidRuntime(19100): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:732)
04-07 14:40:07.725: E/AndroidRuntime(19100): 	at dalvik.system.NativeStart.main(Native Method)