SwipeRefreshLayout导致NullPointerException异常中的onCreate [英] SwipeRefreshLayout causes NullPointerException in onCreate

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本文介绍了SwipeRefreshLayout导致NullPointerException异常中的onCreate的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

运行我的SwipeRefreshLayout应用导致应用程序崩溃。我试图调试的问题,但似乎在 setColorScheme 在它进入 ensureLayout

在logcat的:

  16 07  -  09:46:56.093:E / AndroidRuntime(18659):了java.lang.RuntimeException:无法启动活动ComponentInfo {com.heath_bar.twitter / com.heath_bar。 twitter.MainActivity}:显示java.lang.NullPointerException
07-09 16:46:56.093:E / AndroidRuntime(18659):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2328)
07-09 16:46:56.093:E / AndroidRuntime(18659):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2386)
07-09 16:46:56.093:E / AndroidRuntime(18659):在android.app.ActivityThread.access $ 900(ActivityThread.java:169)
07-09 16:46:56.093:E / AndroidRuntime(18659):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1277)
07-09 16:46:56.093:E / AndroidRuntime(18659):在android.os.Handler.dispatchMessage(Handler.java:102)
07-09 16:46:56.093:E / AndroidRuntime(18659):在android.os.Looper.loop(Looper.java:136)
07-09 16:46:56.093:E / AndroidRuntime(18659):在android.app.ActivityThread.main(ActivityThread.java:5476)
07-09 16:46:56.093:E / AndroidRuntime(18659):在java.lang.reflect.Method.invokeNative(本机方法)
07-09 16:46:56.093:E / AndroidRuntime(18659):在java.lang.reflect.Method.invoke(Method.java:515)
07-09 16:46:56.093:E / AndroidRuntime(18659):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:1268)
07-09 16:46:56.093:E / AndroidRuntime(18659):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1084)
07-09 16:46:56.093:E / AndroidRuntime(18659):在dalvik.system.NativeStart.main(本机方法)
07-09 16:46:56.093:E / AndroidRuntime(18659):致:显示java.lang.NullPointerException
07-09 16:46:56.093:E / AndroidRuntime(18659):在android.support.v4.widget.SwipeRefreshLayout.ensureTarget(SwipeRefreshLayout.java:293)
07-09 16:46:56.093:E / AndroidRuntime(18659):在android.support.v4.widget.SwipeRefreshLayout.setColorScheme(SwipeRefreshLayout.java:268)
07-09 16:46:56.093:E / AndroidRuntime(18659):在com.heath_bar.twitter.MainActivity.onCreate(MainActivity.java:56)
07-09 16:46:56.093:E / AndroidRuntime(18659):在android.app.Activity.performCreate(Activity.java:5451)
07-09 16:46:56.093:E / AndroidRuntime(18659):在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
07-09 16:46:56.093:E / AndroidRuntime(18659):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2292)
07-09 16:46:56.093:E / AndroidRuntime(18659):... 11个

下面是我的code:

  @覆盖
保护无效的onCreate(捆绑savedInstanceState){
    super.onCreate(savedInstanceState);
    的setContentView(R.layout.activity_main);
    SwipeRefreshLayout swipeLayout =(SwipeRefreshLayout)findViewById(R.id.swipe_container);
    swipeLayout.setOnRefreshListener(新OnRefreshListener(){        @覆盖
        公共无效onRefresh(){
            // TODO自动生成方法存根        }
    });
    swipeLayout.setColorScheme(Color.RED,Color.BLUE,Color.GREEN,
            Color.YELLOW);}

我的XAML:

 <?XML版本=1.0编码=UTF-8&GT?;
< android.support.v4.widget.SwipeRefreshLayout的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
机器人:ID =@ + ID / swipe_container
机器人:layout_width =match_parent
机器人:layout_height =match_parent><滚动型
    机器人:ID =@ + ID /滚动视图
    机器人:layout_width =WRAP_CONTENT
    机器人:layout_height =WRAP_CONTENT>    < TableLayout
        机器人:ID =@ + ID /表
        机器人:layout_width =WRAP_CONTENT
        机器人:layout_height =WRAP_CONTENT
        机器人:layout_margin =5DP/>
< /滚动型>
< /android.support.v4.widget.SwipeRefreshLayout>

任何想法,为什么这可能是崩溃?我加入了正确的jar文件,以及到我的Andr​​oid下的私家藏书的项目。

所有的想法都大大AP preciated。谢谢你在前进。


解决方案

不是知道在哪里的问题是,但我相信我有android.support.v4版本20.0不19.1,但百分之百的一些奇怪的原因, setColorScheme 没有标记为pcated德$ p $(因为它是在20.0)。删除库,并重新添加android.support.v4库版本20.0。然后更改 setColorScheme 设置 setColorSchemeColors 固定的问题。

我希望这样可以节省别人一些时间。

Running my app with SwipeRefreshLayout is causing the app to crash. I have tried to debug the issue, but it seems to occur after the setColorScheme in which it goes into ensureLayout

The logcat:

07-09 16:46:56.093: E/AndroidRuntime(18659): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.heath_bar.twitter/com.heath_bar.twitter.MainActivity}: java.lang.NullPointerException
07-09 16:46:56.093: E/AndroidRuntime(18659):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2328)
07-09 16:46:56.093: E/AndroidRuntime(18659):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2386)
07-09 16:46:56.093: E/AndroidRuntime(18659):    at android.app.ActivityThread.access$900(ActivityThread.java:169)
07-09 16:46:56.093: E/AndroidRuntime(18659):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1277)
07-09 16:46:56.093: E/AndroidRuntime(18659):    at android.os.Handler.dispatchMessage(Handler.java:102)
07-09 16:46:56.093: E/AndroidRuntime(18659):    at android.os.Looper.loop(Looper.java:136)
07-09 16:46:56.093: E/AndroidRuntime(18659):    at android.app.ActivityThread.main(ActivityThread.java:5476)
07-09 16:46:56.093: E/AndroidRuntime(18659):    at java.lang.reflect.Method.invokeNative(Native Method)
07-09 16:46:56.093: E/AndroidRuntime(18659):    at java.lang.reflect.Method.invoke(Method.java:515)
07-09 16:46:56.093: E/AndroidRuntime(18659):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1268)
07-09 16:46:56.093: E/AndroidRuntime(18659):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1084)
07-09 16:46:56.093: E/AndroidRuntime(18659):    at dalvik.system.NativeStart.main(Native Method)
07-09 16:46:56.093: E/AndroidRuntime(18659): Caused by: java.lang.NullPointerException
07-09 16:46:56.093: E/AndroidRuntime(18659):    at android.support.v4.widget.SwipeRefreshLayout.ensureTarget(SwipeRefreshLayout.java:293)
07-09 16:46:56.093: E/AndroidRuntime(18659):    at android.support.v4.widget.SwipeRefreshLayout.setColorScheme(SwipeRefreshLayout.java:268)
07-09 16:46:56.093: E/AndroidRuntime(18659):    at com.heath_bar.twitter.MainActivity.onCreate(MainActivity.java:56)
07-09 16:46:56.093: E/AndroidRuntime(18659):    at android.app.Activity.performCreate(Activity.java:5451)
07-09 16:46:56.093: E/AndroidRuntime(18659):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
07-09 16:46:56.093: E/AndroidRuntime(18659):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2292)
07-09 16:46:56.093: E/AndroidRuntime(18659):    ... 11 more

Here is my code:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main); 


    SwipeRefreshLayout swipeLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_container);
    swipeLayout.setOnRefreshListener(new OnRefreshListener() {

        @Override
        public void onRefresh() {
            // TODO Auto-generated method stub

        }
    });
    swipeLayout.setColorScheme(Color.RED, Color.BLUE, Color.GREEN,
            Color.YELLOW);

}

My xaml:

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/swipe_container"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<ScrollView
    android:id="@+id/scrollView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" >

    <TableLayout
        android:id="@+id/table"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="5dp" />
</ScrollView>
</android.support.v4.widget.SwipeRefreshLayout>

Any ideas why this might be crashing? I have added the correct jar file as well into my project under Android Private Libraries.

All ideas are greatly appreciated. Thank you in advance.

解决方案

Not a hundred percent sure where the problem was, but I believe I had android.support.v4 version 20.0 not 19.1, but for some odd reason, setColorScheme was not marked as deprecated (as it is in 20.0). Deleting the library and re-adding android.support.v4 library version 20.0. Then changing setColorScheme to set setColorSchemeColors fixed the issue.

I hope this can save someone else some time.

这篇关于SwipeRefreshLayout导致NullPointerException异常中的onCreate的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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