setAdapter 异常

Question

android异常java

Answer 1

ecalipe是没有提示任何错误和警告的,总之生成出来的apk就是运行不了..

Answer 2

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.test/com.example.test.MainActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2080)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2105)
at android.app.ActivityThread.access$600(ActivityThread.java:136)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1201)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4881)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:808)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:575)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.example.test.MainActivity.onCreate(MainActivity.java:35)
at android.app.Activity.performCreate(Activity.java:5084)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
at com.lbe.security.service.core.client.internal.InstrumentationDelegate.callActivityOnCreate(InstrumentationDelegate.java:76)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2044)
... 11 more

Answer 3

.onCreate(MainActivity.java:35) 这里指的是setadapter() 报错~frament_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.test.MainActivity$PlaceholderFragment" >    <Spinner
        android:id="@+id/from"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="36dp" /></RelativeLayout>
R文件中也有from这个ID,空指针都不知道是指哪里...

Answer 4

你的oncreate方法里面 setContentView(R.layout.activity_main);  但你说你的spinner是在frament_main.xml
里面 当然找不到了

Answer 5

setContentView(R.layout.frament_main);