當我試圖從FragmentActivity傳遞參數到片段時,它給了我在片段中的getArguments()中的空指針異常。從Android FragmentActivity傳遞參數到片段
這是我FragmentActivity代碼
public class IndexChartActivity extends FragmentActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.index_chart);
IndexFragmentActivity indexFragment =
(IndexFragmentActivity)getSupportFragmentManager().findFragmentById(R.id.index_fragment);
indexFragment.newInstance("ASPI");
}
}
這裏是index_chart.xml
<?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:background="#FFFFFF"
android:orientation="vertical" >
<fragment
android:id="@+id/header_fragment"
android:name="com.lk.ignitionit.cse.util.HeaderFragmentActivity"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<fragment
android:id="@+id/index_fragment"
android:name="com.lk.ignitionit.cse.util.IndexFragmentActivity"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<fragment
android:name="com.lk.ignitionit.cse.util.ChartFragmentActivity"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
這裏是片段
public class IndexFragmentActivity extends Fragment {
protected ImageView ivASPI;
protected ImageView ivMPI;
protected ImageView ivSP;
protected TextView tvMain;
protected TextView tvTop;
protected TextView tvBottom;
String response = null;
String result = null;
String [] resultArr = null;
Bundle b = new Bundle();
String indexType = null;
int layout;
IndexFragmentActivity f = null;
public IndexFragmentActivity newInstance(String index) {
f = new IndexFragmentActivity();
Bundle args = new Bundle();
args.putString("indextype", index);
f.setArguments(args);
return f;
}
public String getSelectedIndex() {
return f.getArguments().getString("indextype");
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if(getSelectedIndex().equals("ASPI")){
layout = R.layout.aspi_header;
}else if(getSelectedIndex().equals("MPI")){
layout = R.layout.mpi_header;
}else{
layout = R.layout.sp_header;
}
View view = inflater.inflate(layout, container, false);
tvMain = (TextView) view.findViewById(R.id.tv_main);
tvTop = (TextView) view.findViewById(R.id.tv_top);
tvBottom = (TextView) view.findViewById(R.id.tv_bottom);
new ServiceAccess().execute("");
tvMain.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
b.putString("type", "S&P SL20");
Activity activity = getActivity();
Intent intent = new Intent(activity, IndexChartActivity.class);
intent.putExtras(b);
startActivity(intent);
}
});
return view;
}
}
,這裏是我的錯誤
Caused by: java.lang.NullPointerException
at com.lk.ignitionit.cse.util.IndexFragmentActivity.getSelectedIndex(IndexFragmentActivity.java:69)
我介紹了很多與此相關的stackoverflow問題,並試着給出http://developer.android.com/guide/components/fragments.html的示例代碼。但仍沒有運氣
非常感謝所有反饋這個,因爲這似乎是我不能想出一個很基本的問題..提前
感謝
非常感謝您的指導。一旦我解決了問題,我會做工作並更新答案。 – virtualpathum