我有一个在片段中单击 listView 项目时调用的 Activity。我的问题是，即使我对布局进行了更改（设置 textviews 的文本等）并调用 setContentView，活动屏幕仍然是空白的。
从到处使用的 Log.i 中，在 logcat 中，我可以看到所有数据并且它被正确设置，所以这不是问题。
我的问题是如何做到这一点，以便我所做的更改显示在屏幕上/如何使用新数据刷新布局。
public class SemListViewActivity extends Activity
{
JSONObject recdJson=new JSONObject();
JSONArray ar;
ArrayList<HashMap<String, String>> keyslist;
TextView semTCredits, semSession, semGPA;
ListView semList;
SemListAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState)
{
Log.i("Info Tag Sem","Inside Sem");
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
super.onCreate(savedInstanceState);
setContentView(R.layout.sem_details_listview_layout);
//LayoutInflater inflater = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
//View v = inflater.inflate(R.layout.sem_details_listview_layout,null);
ar = new JSONArray();
keyslist = new ArrayList<HashMap<String, String>>();
try
{
recdJson = GlobalVars.semJSON;
Log.i("Info Tag Sem","Got the JSON");
ar = recdJson.getJSONArray("seminfo");
Log.i("Info Tag Sem","assigning JSON Array");
for (int i = 0; i < ar.length(); i++)
{
JSONObject jObject = ar.getJSONObject(i);
HashMap<String, String> map = new HashMap<String, String>();
Log.i("Info Tag Sem","jObject Init"+i);
Log.i("Info Tag Sem",jObject.toString());
Log.i("Info Tag Sem",jObject.getString("subcode"));
map.put("subcode", jObject.getString("subcode"));
map.put("sub", jObject.getString("sub"));
map.put("credits", jObject.getString("credits"));
map.put("grade", jObject.getString("grade"));
keyslist.add(map);
}
Log.i("Info Tag Sem","Done with Hashmapping");
semTCredits = (TextView)findViewById(R.id.semTCredits);
semSession = (TextView)findViewById(R.id.semSession);
semGPA = (TextView)findViewById(R.id.semGPA);
Log.i("Info Tag Sem","Set the textviews");
semTCredits.setText("Total Credits: " + recdJson.getString("credits"));
semSession.setText("Session: " + recdJson.getString("session"));
semGPA.setText("Semester GPA: " + recdJson.getString("gpa"));
semList = (ListView)findViewById(R.id.semlist);
adapter = new SemListAdapter(this, keyslist);
semList.setAdapter(adapter);
Log.i("Info Tag Sem","Put the content");
setContentView(R.layout.sem_details_listview_layout);
} catch (JSONException e)
{
e.printStackTrace();
Log.i("Info Tag Sem","Nothing happened ");
}
}
}
这是相关的xml布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/semTCredits"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="5dp"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textStyle="bold" />
<TextView
android:id="@+id/semSession"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="2dp"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textIsSelectable="true" />
<TextView
android:id="@+id/semGPA"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="2dp"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textIsSelectable="true" />
<ListView
android:id="@+id/semlist"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
</LinearLayout>
抱歉，如果这个问题是重复的，我不知道如何表达我的问题。