我收到了这个错误，我不知道为什么：
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): null
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): java.lang.NullPointerException
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.widget.Spinner.measureContentWidth(Spinner.java:682)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.widget.Spinner.onMeasure(Spinner.java:442)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.view.View.measure(View.java:15513)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4827)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.view.View.measure(View.java:15513)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4827)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1052)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.widget.LinearLayout.onMeasure(LinearLayout.java:590)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.view.View.measure(View.java:15513)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4827)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.view.View.measure(View.java:15513)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.widget.ScrollView.measureChildWithMargins(ScrollView.java:1217)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.widget.ScrollView.onMeasure(ScrollView.java:321)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.view.View.measure(View.java:15513)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4827)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.view.View.measure(View.java:15513)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.widget.LinearLayout.measureVertical(LinearLayout.java:847)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.view.View.measure(View.java:15513)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4827)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2176)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.view.View.measure(View.java:15513)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.view.Choreographer.doCallbacks(Choreographer.java:562)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.view.Choreographer.doFrame(Choreographer.java:532)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.os.Handler.handleCallback(Handler.java:725)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.os.Handler.dispatchMessage(Handler.java:92)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.os.Looper.loop(Looper.java:137)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at android.app.ActivityThread.main(ActivityThread.java:5191)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at java.lang.reflect.Method.invokeNative(Native Method)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at java.lang.reflect.Method.invoke(Method.java:511)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)
02-02 22:00:59.207: E/java.lang.NullPointerException(6258): at dalvik.system.NativeStart.main(Native Method)
我有这样的代码，可能会触发错误：
spBarausLangbezeichnung = (Spinner) findViewById(R.id.barauslage_eingabe_spbarauslagebezeichnung);
final List<BarausInfo> barausInfos = getHelper().getRTE(BarausInfo.class).queryForAll();
adapterBarausLangbezeichnung = new SpinnerArrayAdapter<BarausInfo>(this, barausInfos) {
public void set(View v, int position, List<BarausInfo> barInfos) {
((TextView) v).setText(barInfos.get(position).BarausLang.Bezeichnung);
}
};
spBarausLangbezeichnung.setAdapter(adapterBarausLangbezeichnung);
SpinnerArrayAdapter（来自互联网）：
public abstract class SpinnerArrayAdapter<T> extends ArrayAdapter<T> {
private List<T> items;
private Activity activity;
public SpinnerArrayAdapter(Activity activity, List<T> items) {
super(activity, android.R.layout.simple_list_item_1, items);
this.items = items;
this.activity = activity;
}
public abstract void set(View v, int position, List<T> items);
@Override
public View getDropDownView(int position, View convertView, ViewGroup parent) {
TextView v = (TextView) super.getView(position, convertView, parent);
if (v == null) {
v = new TextView(activity);
}
v.setTextColor(Color.BLACK);
set(v, position, items);
return v;
}
@Override
public T getItem(int position) {
return items.get(position);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater inflater = activity.getLayoutInflater();
v = inflater.inflate(android.R.layout.simple_spinner_item, null);
}
TextView lbl = (TextView) v.findViewById(android.R.id.text1);
lbl.setTextColor(Color.BLACK);
set(v, position, items);
return convertView;
}
}
如果您发现代码中有任何错误，请告诉我。我从错误中看到的只是一些宽度和高度测量功能，但这并没有告诉我什么。
编辑：我的xml：
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1.22"
android:text="@string/texteinsatzvonbis" />
<TextView
android:id="@+id/barauslage_eingabe_einsatzvon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="02.02.2012" />
<TextView
android:id="@+id/barauslage_eingabe_einsatzbis"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="02.04.2012" />
</LinearLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/textbarauslagedatum" />
<TextView
android:id="@+id/barauslage_eingabe_barauslagedatum"
style="@android:style/Widget.Button.Small"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</TextView>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/textbarauslagebezeichnung" />
<Spinner
android:id="@+id/barauslage_eingabe_spbarauslagebezeichnung"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="0dip" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1.22"
android:orientation="vertical" >
<Spinner
android:id="@+id/barauslage_eingabe_spbarauslagewaehrung"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="0dip" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="@string/textbarauslagemenge" />
<EditText
android:id="@+id/barauslage_eingabe_editbarauslagemenge"
android:layout_width="60dip"
android:layout_height="wrap_content"
android:inputType="number" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="@string/textbarauslageeinzelpreis" />
<EditText
android:id="@+id/barauslage_eingabe_editbarauslageeinzelpreis"
android:layout_width="140dip"
android:layout_height="wrap_content"
android:inputType="numberDecimal" />
</LinearLayout>
</LinearLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/textbarauslagebemerkung" />
<EditText
android:id="@+id/barauslage_eingabe_editbarauslagebemerkung"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1.22"
android:inputType="textMultiLine"
android:maxLength="30"
android:scrollbars="vertical" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="bottom"
android:orientation="horizontal" >
<ImageButton
android:id="@+id/btnspeichern"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_save_selected" />
<ImageButton
android:id="@+id/btnrevert"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_revert" />
<Button
android:id="@+id/btnabbrechen"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="@string/abbrechen" />
</LinearLayout>
</LinearLayout>
</ScrollView>
答案 0 :(得分：0)
打破了问题。希望自己有成功地工作，因为我找到了一个，我相信坚持这个问题。
请注意
return convertView;
应该阅读
return v;