Android 试图从微调器获取数据,但其为NULL
我有一个片段,上面有几个微调器,用户可以从中选择一些选项,底部有一个按钮。我为按钮设置了onClick,以从微调器获取数据,然后将其发送到带有asyncTask的数据库 片段xml如下所示:Android 试图从微调器获取数据,但其为NULL,android,android-fragments,android-spinner,android-xml,Android,Android Fragments,Android Spinner,Android Xml,我有一个片段,上面有几个微调器,用户可以从中选择一些选项,底部有一个按钮。我为按钮设置了onClick,以从微调器获取数据,然后将其发送到带有asyncTask的数据库 片段xml如下所示: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_p
<?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/tastePickTitle"
android:text="Select a Taste: "
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:ems="10"
android:textSize="20sp"
android:textStyle = "bold"
android:padding="5dip"
>
</TextView>
<Spinner
android:id="@+id/spinner1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:entries="@array/taste_array"
/>
<View
android:layout_width="fill_parent"
android:layout_height="30dp">
</View>
<TextView
android:id="@+id/ammountPickTitle"
android:text="How much taste: "
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:ems="10"
android:textSize="20sp"
android:textStyle = "bold"
android:padding="5dip"
>
</TextView>
<Spinner
android:id="@+id/spinner2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:entries="@array/ammount_array"
/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:id="@+id/addTasteButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Add Taste"
android:layout_weight="1"
/>
</LinearLayout>
</LinearLayout>
FC错误:
02-14 20:29:59.102 19523-19523/com.beerportfolio.beerportfoliopro E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
02-14 20:30:21.266 19523-19523/com.beerportfolio.beerportfoliopro E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NullPointerException
at com.beerportfolio.beerportfoliopro.AddTastePage$1.onClick(AddTastePage.java:55)
at android.view.View.performClick(View.java:4280)
at android.view.View$PerformClick.run(View.java:17984)
at android.os.Handler.handleCallback(Handler.java:730)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:5789)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:843)
at dalvik.system.NativeStart.main(Native Method)
AddTastePage中的第55行是:
String ammountText = ammountSpinner.getSelectedItem().toString();
您有两个
v
的声明,它们可能混淆了。你有这个v
View v = inflater.inflate(R.layout.add_taste_layout, container, false);
然后你就有了这个按钮,就是你点击的按钮
@Override
public void onClick(View v)
因此,v
将不会包含微调器,从而导致微调器为空,因为它找不到它
将onClick one重命名为其他名称,您可能还需要将布局的第一个
v
设置为最终,因为您要在onClick中访问它,只需在上声明微调器
setOnClickListener
请尝试以下代码:
//add button onclick fo top beers
Button bt = (Button)v.findViewById(R.id.addTasteButton);
final Spinner tasteSpinner = (Spinner)v.findViewById(R.id.spinner1);
final Spinner ammountSpinner = (Spinner) v.findViewById(R.id.spinner2);
bt.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//todo: send taste tag to server
//get spinner text
String tasteText = tasteSpinner.getSelectedItem().toString();
String ammountText = ammountSpinner.getSelectedItem().toString();
//add button onclick fo top beers
Button bt = (Button)v.findViewById(R.id.addTasteButton);
final Spinner tasteSpinner = (Spinner)v.findViewById(R.id.spinner1);
final Spinner ammountSpinner = (Spinner) v.findViewById(R.id.spinner2);
bt.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//todo: send taste tag to server
//get spinner text
String tasteText = tasteSpinner.getSelectedItem().toString();
String ammountText = ammountSpinner.getSelectedItem().toString();