Android-Bug收集

1. java.lang.IllegalStateException: RecyclerView has no LayoutManager
   at android.support.v7.widget.RecyclerView.generateLayoutParams(RecyclerView.java:3256)
   at android.view.LayoutInflater.inflate(LayoutInflater.java:499)
   at android.view.LayoutInflater.inflate(LayoutInflater.java:415)

解决方式：给RecycleView设置LayoutManger，recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
如果有对RecycleView添加HeaderView，该设置请放到添加加载Header布局之前

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2.

FATAL EXCEPTION: main Process: com.fotoable.torchflashlight, PID: 5764 java.lang.RuntimeException: Unable to get provider com.google.firebase.provider.FirebaseInitProvider: java.lang.ClassNotFoundException: Didn't find class "com.google.firebase.provider.FirebaseInitProvider" on path: DexPathList[[zip file "/data/app/com.coolspan.torchflashlight-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.coolspan.torchflashlight-1, /vendor/lib, /system/lib]]     at android.app.ActivityThread.installProvider(ActivityThread.java:4793)     at android.app.ActivityThread.installContentProviders(ActivityThread.java:4385)     at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4325)     at android.app.ActivityThread.access$1500(ActivityThread.java:135)     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)     at android.os.Handler.dispatchMessage(Handler.java:102)     at android.os.Looper.loop(Looper.java:136)     at android.app.ActivityThread.main(ActivityThread.java:5017)     at java.lang.reflect.Method.invokeNative(Native Method)     at java.lang.reflect.Method.invoke(Method.java:515)     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)     at dalvik.system.NativeStart.main(Native Method)  Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.firebase.provider.FirebaseInitProvider" on path: DexPathList[[zip file "/data/app/com.fotoable.torchflashlight-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.coolspan.torchflashlight-1, /vendor/lib, /system/lib]]     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)     at java.lang.ClassLoader.loadClass(ClassLoader.java:497)     at java.lang.ClassLoader.loadClass(ClassLoader.java:457)     at android.app.ActivityThread.installProvider(ActivityThread.java:4778)     at android.app.ActivityThread.installContentProviders(ActivityThread.java:4385)?     at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4325)?     at android.app.ActivityThread.access$1500(ActivityThread.java:135)?     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)?     at android.os.Handler.dispatchMessage(Handler.java:102)?     at android.os.Looper.loop(Looper.java:136)?     at android.app.ActivityThread.main(ActivityThread.java:5017)?     at java.lang.reflect.Method.invokeNative(Native Method)?     at java.lang.reflect.Method.invoke(Method.java:515)?     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)?     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)?     at dalvik.system.NativeStart.main(Native Method)?

解决方法：可能是添加MultiDex分包，但未初始化的原因，在Application中初始化即可。

 @Override    protected void attachBaseContext(Context base) {        super.attachBaseContext(base);        MultiDex.install(base);    }

3.
此问题是使用系统DownloadManager导致的
因为我设置了下载通知不可见；

request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_HIDDEN);java.lang.SecurityException: Invalid value for visibility: 2     at android.os.Parcel.readException(Parcel.java:1546)     at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:185)     at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:137)     at android.content.ContentProviderProxy.insert(ContentProviderNative.java:476)     at android.content.ContentResolver.insert(ContentResolver.java:1260)     at android.app.DownloadManager.enqueue(DownloadManager.java:1336)

解决方法：
添加权限即可

  <!--DownloadManager下载时不显示Notification-->    <uses-permission android:name="android.permission.DOWNLOAD_WITHOUT_NOTIFICATION" />

4.
问题：使用 Collections.sort导致出现的异常

java.lang.IllegalArgumentException: Comparison method violates its general contract!     at java.util.TimSort.mergeLo(TimSort.java:743)     at java.util.TimSort.mergeAt(TimSort.java:479)     at java.util.TimSort.mergeCollapse(TimSort.java:406)     at java.util.TimSort.sort(TimSort.java:210)     at java.util.TimSort.sort(TimSort.java:169)     at java.util.Arrays.sort(Arrays.java:2010)     at java.util.Collections.sort(Collections.java:1883)

代码：

Collections.sort(appInfoList, new Comparator<AppInfo>() {                @Override                public int compare(AppInfo o1, AppInfo o2) {                    int value = (int) (o1.getLastUpdateTime() - o2.getLastUpdateTime());                    int state = 0;                    if (value > 0) {                        state = 1;                    } else if (value < 0) {                        state = -1;                    }                    Log.e("AppList", "value:::::" + state);                    return state;                }            });

解决方法：
网上说设置：
System.setProperty(“java.util.Arrays.useLegacyMergeSort”, “true”);
好像不好使啊。

解决后的代码是，类型转换导致：

long value = (o1.getLastUpdateTime() - o2.getLastUpdateTime());