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 = new Toast(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：


 public void onCreate( final Bundle savedInstanceState) {

 

  super .onCreate(savedInstanceState);

 

   setContentView(R.layout.alarms);

 

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

 

  setListAdapter(m_alarmAdapter);

 

   ListView lv = getListView();

 

  lv.setOnItemClickListener( new OnItemClickListener() {

 

   public void onItemClick( final AdapterView<?> parent, final View view, final int position, final long id) {

 

   Log.d(TAG, "clicked: " + view);

 

    final Alarm o = m_alarmAdapter.getItem(position);

 

  LayoutInflater infator = getLayoutInflater();