android中自定义toast

   我想改变下toast的背景和文本颜色
       

用了下面的方法：

 LayoutInflater infator = getLayoutInflater();

 View layout =infator.inflate(R.layout.toast, (ViewGroup) findViewById(R.id.toast_layout));

 

 TextView toastText = (TextView) findViewById(R.id.toasttext);

 

 toastText.setBackgroundColor(Color.YELLOW);

 

 toastText.setText("uei:"+o.getUei());

 

 Toast toast = newToast(getApplicationContext());

 

toast.setDuration(Toast.LENGTH_LONG);

 

 toast.setView(layout);

 

 toast.show();




这个代码是我的listview的OnItemClickListener的，但是app由于空指针异常被强制关闭了
       
这是onclick listener上面的代码：


 publicvoid onCreate(finalBundle savedInstanceState) {

 

 super.onCreate(savedInstanceState);

 

  setContentView(R.layout.alarms);

 

 m_alarmAdapter = newAlarmAdapter(this, R.layout.severity_item, m_alarms);

 

 setListAdapter(m_alarmAdapter);

 

  ListView lv = getListView();

 

 lv.setOnItemClickListener(newOnItemClickListener() {

 

  publicvoid onItemClick(finalAdapterView<?> parent, finalView view, finalint position, finallong id) {

 

  Log.d(TAG,"clicked: " + view);

 

   finalAlarm o = m_alarmAdapter.getItem(position);

 

 LayoutInflater infator = getLayoutInflater();