目录

  • 前言
  • 正文
    • 1 No toolchains found in the NDK toolchains folder for ABI with prefix: mipsel-linux-android
    • 2 Caused by: android.database.sqlite.SQLiteException: no such table: (code 1) Android
    • 3 RecyclerView notifyItemChanged 没有效果
    • 4 NotSerializableException 异常
    • 5 RecyclerView 刷新时的异常
    • 6 关于Activity切换动画（overridePendingTransition）的黑色背景问题
    • 7 android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?
    • 8 分享文件时报错 FileUriExposedException：
    • 9 在 API19的手机上使用 vector 资源报错
    • 10 混淆反射导致的异常

前言

看到其他同学总结的开发中的bug，真的很受教。自己也应该向他们学习，“好记性不如烂笔头”，何况自己又很健忘。希望自己也能总结出一份不错的bug汇总。

正文

1 No toolchains found in the NDK toolchains folder for ABI with prefix: mipsel-linux-android

日期：2018年12月21日21:52:42
这是在 AS 编译项目时出现的错误，自己是通过搜索解决的。查看： 完美解决 No toolchains found in the NDK toolchains folder for ABI with prefix: mips64el-linux-android。

2 Caused by: android.database.sqlite.SQLiteException: no such table: (code 1) Android

这个异常时因为数据库不存在导致的。在我的项目中，是因为assets 目录下的数据库没有解压到data/data/目录下导致的。

3 RecyclerView notifyItemChanged 没有效果

日期：2019年1月9日13:10:32
这是因为自己在子线程中调用此刷新导致的，需要在主线程中调用。

4 NotSerializableException 异常

java.lang.RuntimeException: Parcelable encountered IOException writing serializable object (name = com.wql.downloader.beans.TabInfo)
Caused by: java.io.NotSerializableException: com.wql.downloader.fragment.WebFragment
原因：这是因为在一个实现了 Serializable 接口的类中，存在未序列化的变量。
解决办法：使用 transient 关键字修饰该变量，阻止其被序列化。但最终的解决办法是不在这里保存 WebFragment 对象。

5 RecyclerView 刷新时的异常

01-10 22:08:22.746 26570-26570/com.wql.downloaderplay E/AndroidRuntime: FATAL EXCEPTION: main    Process: com.wql.downloaderplay, PID: 26570    java.lang.IndexOutOfBoundsException: Inconsistency detected. Invalid view holder adapter positionViewHolder{5f6ec69 position=3 id=-1, oldPos=3, pLpos:-1 scrap [attachedScrap] tmpDetached no parent} android.support.v7.widget.RecyclerView{5b499f7 VFED..... .F....ID 0,171-1080,1590 #7f08014a app:id/recycler_view}, adapter:com.wql.downloader.adapters.DownloadProgressAdapter@d90064, layout:android.support.v7.widget.LinearLayoutManager@bdbd2cd, context:com.wql.downloader.activity.HomeActivity@629111a        at android.support.v7.widget.RecyclerView$Recycler.validateViewHolderForOffsetPosition(RecyclerView.java:5715)        at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5898)        at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5858)        at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5854)        at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2230)        at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1557)        at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1517)        at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:612)        at android.support.v7.widget.RecyclerView.dispatchLayoutStep1(RecyclerView.java:3875)        at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3639)        at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:4194)        at android.view.View.layout(View.java:16754)        at android.view.ViewGroup.layout(ViewGroup.java:5462)        at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1079)        at android.view.View.layout(View.java:16754)        at android.view.ViewGroup.layout(ViewGroup.java:5462)        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:338)        at android.widget.FrameLayout.onLayout(FrameLayout.java:273)        at android.view.View.layout(View.java:16754)        at android.view.ViewGroup.layout(ViewGroup.java:5462)        at android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:1231)        at android.view.View.layout(View.java:16754)        at android.view.ViewGroup.layout(ViewGroup.java:5462)        at android.support.constraint.ConstraintLayout.onLayout(ConstraintLayout.java:1915)        at android.view.View.layout(View.java:16754)        at android.view.ViewGroup.layout(ViewGroup.java:5462)        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:338)        at android.widget.FrameLayout.onLayout(FrameLayout.java:273)        at android.view.View.layout(View.java:16754)        at android.view.ViewGroup.layout(ViewGroup.java:5462)        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1764)        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1607)        at android.widget.LinearLayout.onLayout(LinearLayout.java:1516)        at android.view.View.layout(View.java:16754)        at android.view.ViewGroup.layout(ViewGroup.java:5462)        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:338)        at android.widget.FrameLayout.onLayout(FrameLayout.java:273)        at android.view.View.layout(View.java:16754)        at android.view.ViewGroup.layout(ViewGroup.java:5462)        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1764)        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1607)        at android.widget.LinearLayout.onLayout(LinearLayout.java:1516)        at android.view.View.layout(View.java:16754)        at android.view.ViewGroup.layout(ViewGroup.java:5462)        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:338)        at android.widget.FrameLayout.onLayout(FrameLayout.java:273)        at com.android.internal.policy.PhoneWindow$DecorView.onLayout(PhoneWindow.java:2748)        at android.view.View.layout(View.java:16754)        at android.view.ViewGroup.layout(ViewGroup.java:5462)        at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2225)        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1982)    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:

待解决。

6 关于Activity切换动画（overridePendingTransition）的黑色背景问题

这是因为在 overridePendingTransition：

public void overridePendingTransition(int enterAnim, int exitAnim)

的第二个参数设置为 null。
解决办法是在第二个参数设置动画，但不会有任何的动画。

<?xml version="1.0" encoding="utf-8"?><translate xmlns:android="http://schemas.android.com/apk/res/android"           android:fromXDelta="0"           android:toXDelta="0"           android:fromYDelta="0"           android:toYDelta="0"           android:duration="250"/>

7 android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?

时间：2019年1月16日13:20:51
使用非Activity的上下文startActivity 时，需要：

chooser.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

8 分享文件时报错 FileUriExposedException：

android.os.FileUriExposedException: file:///storage/emulated/0/AwesomeDownload/Download/IMDb%20-%20Movies%2C%20TV%20and%20Celebrities%20-%20IMDb_1547706246.mp4 exposed beyond app through ClipData.Item.getUri()

时间：2019年1月17日17:07:12
这是在7.0以上手机上的报错，7.0开始不允许带有file://的Uri离开应用，要和其他应用共享File数据，需要使用content://的方式。
解决办法：适配7.0以上的手机。

public static boolean shareFile(Context context, File file) {        if (file == null || !file.exists()) {            Toast.makeText(MyApplication.getContext(), R.string.finish_popup_menu_share_no_file, Toast.LENGTH_SHORT).show();            return false;        }        Intent share = new Intent(Intent.ACTION_SEND);        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {            Uri uri = FileProvider.getUriForFile(context,                    context.getApplicationContext().getPackageName() + ".fileprovider", file);            share.putExtra(Intent.EXTRA_STREAM, uri);        } else {            share.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(file));        }        share.setType(getMimeType(file.getAbsolutePath()));        //  If you're using an intent to make the system open your file, you may need to add the following line of code        share.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);        if (context.getPackageManager().resolveActivity(share, PackageManager.MATCH_DEFAULT_ONLY) != null) {            try {                Intent chooser = Intent.createChooser(share, context.getString(R.string.finish_popup_menu_share));                chooser.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);                context.startActivity(chooser);                return true;            } catch (ActivityNotFoundException e) {                return false;            }        }        return false;    }

在 xml 目录下，添加 storage_file_paths.xml：

<?xml version="1.0" encoding="utf-8"?><paths xmlns:android="http://schemas.android.com/apk/res/android">    <external-path name="external_files" path="."/>paths>

在清单文件中添加：

<provider    android:name="android.support.v4.content.FileProvider"    android:authorities="${applicationId}.fileprovider"    android:exported="false"    android:grantUriPermissions="true">            <meta-data        android:name="android.support.FILE_PROVIDER_PATHS"        android:resource="@xml/storage_file_paths" />provider>

9 在 API19的手机上使用 vector 资源报错

android.content.res.Resources$NotFoundException: File res/drawable/ic_book_24dp.xml from drawable resource ID #0x7f080080. If the resource you are trying to use is a vector resource, you may be referencing it in an unsupported way. See AppCompatDelegate.setCompatVectorFromResourcesEnabled() for more info.        at android.content.res.Resources.loadDrawable(Resources.java:2152)        at android.content.res.Resources.getDrawable(Resources.java:710)        at com.wql.downloader.fragment.MyFragment.initView(MyFragment.java:72)        at com.wql.downloader.fragment.MyFragment.onViewCreated(MyFragment.java:59)        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1471)        at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1784)        at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:797)        at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2625)        at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2411)        at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2366)        at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2273)        at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:733)        at android.os.Handler.handleCallback(Handler.java:808)        at android.os.Handler.dispatchMessage(Handler.java:103)        at android.os.Looper.loop(Looper.java:193)        at android.app.ActivityThread.main(ActivityThread.java:5299)        at java.lang.reflect.Method.invokeNative(Native Method)        at java.lang.reflect.Method.invoke(Method.java:515)        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:825)        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:641)        at dalvik.system.NativeStart.main(Native Method)     Caused by: org.xmlpull.v1.XmlPullParserException: Binary XML file line #1: invalid drawable tag vector        at android.graphics.drawable.Drawable.createFromXmlInner(Drawable.java:933)        at android.graphics.drawable.Drawable.createFromXml(Drawable.java:877)        at android.content.res.Resources.loadDrawable(Resources.java:2148)        at android.content.res.Resources.getDrawable(Resources.java:710)         at com.wql.downloader.fragment.MyFragment.initView(MyFragment.java:72)         at com.wql.downloader.fragment.MyFragment.onViewCreated(MyFragment.java:59)         at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1471)         at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1784)         at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:797)         at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2625)         at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2411)         at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2366)         at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2273)         at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:733)         at android.os.Handler.handleCallback(Handler.java:808)         at android.os.Handler.dispatchMessage(Handler.java:103)         at android.os.Looper.loop(Looper.java:193)         at android.app.ActivityThread.main(ActivityThread.java:5299)         at java.lang.reflect.Method.invokeNative(Native Method)         at java.lang.reflect.Method.invoke(Method.java:515)         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:825)         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:641)         at dalvik.system.NativeStart.main(Native Method)

时间：2019年1月19日11:02:31
解决办法：在Activity的基类中添加：

static {        AppCompatDelegate.setCompatVectorFromResourcesEnabled(true);}

参考：https://stackoverflow.com/questions/38467680/android-getting-resourcesnotfoundexception-for-abc-ic-ab-back-material

10 混淆反射导致的异常

01-22 09:48:05.434 8410-8410/? E/AndroidRuntime: FATAL EXCEPTION: main    Process: com.wql.downloaderplay, PID: 8410    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.wql.downloaderplay/com.wql.downloader.activity.HomeActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2444)        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2504)        at android.app.ActivityThread.access$900(ActivityThread.java:165)        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1368)        at android.os.Handler.dispatchMessage(Handler.java:102)        at android.os.Looper.loop(Looper.java:150)        at android.app.ActivityThread.main(ActivityThread.java:5546)        at java.lang.reflect.Method.invoke(Native Method)        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:684)     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference        at com.wql.downloader.views.BottomNavigationViewEx.getBottomNavigationItemViews(BottomNavigationViewEx.java:46)        at com.wql.downloader.views.BottomNavigationViewEx.b(BottomNavigationViewEx.java:35)        at com.wql.downloader.activity.HomeActivity.e(HomeActivity.java:746)        at com.wql.downloader.activity.HomeActivity.r(HomeActivity.java:163)        at com.wql.downloader.activity.HomeActivity.onCreate(HomeActivity.java:136)        at android.app.Activity.performCreate(Activity.java:6367)        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1110)        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2397)        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2504)         at android.app.ActivityThread.access$900(ActivityThread.java:165)         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1368)         at android.os.Handler.dispatchMessage(Handler.java:102)         at android.os.Looper.loop(Looper.java:150)         at android.app.ActivityThread.main(ActivityThread.java:5546)         at java.lang.reflect.Method.invoke(Native Method)         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:684)

时间：2019年1月22日22:38:20
原因：使用 BottomNavigationView 进行扩展，得到如下类：

public class BottomNavigationViewEx extends BottomNavigationView {    public BottomNavigationViewEx(Context context) {        super(context);    }    public BottomNavigationViewEx(Context context, AttributeSet attrs) {        super(context, attrs);    }    public BottomNavigationViewEx(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    private BottomNavigationItemView[] mButtons;    private BottomNavigationMenuView mMenuView;    public BottomNavigationItemView getBottomNavigationItemView(int position) {        return getBottomNavigationItemViews()[position];    }    private BottomNavigationItemView[] getBottomNavigationItemViews() {        if (null != mButtons)            return mButtons;        /*         * 1 private final BottomNavigationMenuView mMenuView;         * 2 private BottomNavigationItemView[] mButtons;         */        BottomNavigationMenuView mMenuView = getBottomNavigationMenuView();        mButtons = getField(mMenuView.getClass(), mMenuView, "buttons");        return mButtons;    }    /**     * get private mMenuView     *     * @return     */    private BottomNavigationMenuView getBottomNavigationMenuView() {        if (null == mMenuView)            mMenuView = getField(BottomNavigationView.class, this, "menuView");        return mMenuView;    }    /**     * get private filed in this specific object     *     * @param targetClass     * @param instance    the filed owner     * @param fieldName     * @param      * @return field if success, null otherwise.     */    private <T> T getField(Class targetClass, Object instance, String fieldName) {        try {            Field field = targetClass.getDeclaredField(fieldName);            field.setAccessible(true);            return (T) field.get(instance);        } catch (NoSuchFieldException e) {            e.printStackTrace();        } catch (IllegalAccessException e) {            e.printStackTrace();        }        return null;    }}

但是在打 release 包时，没有添加混淆文件，导致其中需要取反射的字段 buttons，menuView，无法找到。最终导致空指针。
添加混淆文件，解决了这个问题：

-keep public class android.support.design.widget.BottomNavigationView { *; }-keep public class android.support.design.internal.BottomNavigationMenuView { *; }-keep public class android.support.design.internal.BottomNavigationItemView { *; }

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