我怎么findviewbyid从tabhost内的活动多数民众赞成在tabhost内部的看法？

问题描述

我想检索看法，但它一直返回null，我怎么找到它？

 公共类TripDailyItinerary延伸活动{
ViewGroup中布局;
视图V;@覆盖
保护无效的onCreate（捆绑savedInstanceState）{
// TODO自动生成方法存根
super.onCreate（savedInstanceState）;
的setContentView（R.layout.html_content）;
TextView的内容=（的TextView）findViewById（R.id.htmlContent）;
布局=（ViewGroup中）findViewById（R.layout.trip_content）;
V =（查看）layout.findViewById（R.id.bg）; //错误所在
JSONObject的保留;
。INT resNumber =（（MyApp的）this.getApplication（））getResNum（）;
串dailyitinerary =;尝试{
预订=（（MyApp的） this.getApplication()).getJSON().getJSONObject(\"response\").getJSONArray(\"reservations\").getJSONObject(resNumber);
dailyitinerary = reservation.getString（dailyitinerary）;
}赶上（JSONException E）{
// TODO自动生成catch块
e.printStackTrace（）;
}
content.setText（Html.fromHtml（dailyitinerary））;
}}
 

我一直在V =（视图）得到一个NullPointerException异常....等。

解决方案

 布局=（ViewGroup中）findViewById（R.layout.trip_content）;
V =（查看）layout.findViewById（R.id.bg）; //错误所在
 

下面取代上述的两行

  LayoutInflater吹气=（LayoutInflater）的getContext（）getSystemService（Context.LAYOUT_INFLATER_SERVICE）。
查看查看= inflater.inflate（R.layout.R.layout.trip_content，NULL）;
TextView的名字=（TextView中）view.findViewById（R.id.bg）;
 

TextView的也可以在控制或者ImageView的和任何其他替代。

I'm trying to retrieve a view but it keeps returning null, how do I find it?

public class TripDailyItinerary extends Activity {
ViewGroup layout;
View v;

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.html_content);
TextView content = (TextView) findViewById(R.id.htmlContent);
layout = (ViewGroup) findViewById(R.layout.trip_content);
v = (View) layout.findViewById(R.id.bg); //where the error is


JSONObject reservation;
int resNumber = ((MyApp) this.getApplication()).getResNum();
String dailyitinerary = "";

try {
reservation = ((MyApp) this.getApplication()).getJSON().getJSONObject("response").getJSONArray("reservations").getJSONObject(resNumber);
dailyitinerary = reservation.getString("dailyitinerary");
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
content.setText(Html.fromHtml(dailyitinerary));
}

}

I keep getting a NullPointerException at v = (view) .... etc.

解决方案

layout = (ViewGroup) findViewById(R.layout.trip_content);
v = (View) layout.findViewById(R.id.bg); //where the error is

replace the above two lines with below

LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view view = inflater.inflate(R.layout.R.layout.trip_content,null);
TextView name = (TextView) view.findViewById(R.id.bg);

also TextView can be replaced with your control either ImageView and any other.

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