Android编程常见问题及解决(持续更新)

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选择匿名的用户   2021-5-31 16:00   19   0

Android涉及软硬件,因此相关的坑很多,以前每次都解决了就算了,现准备将这些错误记录下,以便以后查阅。这里只列出我自己的情况。

如果看这篇blog的人觉得有哪些地方需要完善,欢迎指正。

我会对每个错误标明自己用的配置。

1. Cannot Resolve Symbol R

配置:Window10,AS 3.1.3, buildToolsVersion:28.0.1, compileSdkVersion 28,手机:Nexus6P Android7.1.2(API25)

情况:有两种:存在R.java和不存在R.java,我目前只遇到不存在R.java。

不存在R.java解决:

(1) 法一:Clean Project -> Rebuild Project

(2) 法二: 重启AS

(3) 法三: New一个Project,copy原来的

参考:

(1)https://blog.csdn.net/pinklpig/article/details/6566578

(2)https://blog.csdn.net/ccpat/article/details/50738811(手动生成R.java,日后学习下)

2. 透明Activity崩溃

配置:Window10,AS 3.1.3, buildToolsVersion:28.0.1, compileSdkVersion 28,手机:Nexus6P Android7.1.2(API25)

错误:

    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.lxiao.workpreapre2/com.example.lxiao.workpreapre2.ActivityTest.activityMain2}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2666)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2727)
        at android.app.ActivityThread.-wrap12(ActivityThread.java)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1478)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:154)
        at android.app.ActivityThread.main(ActivityThread.java:6121)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)
     Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
        at android.support.v7.app.AppCompatDelegateImpl.createSubDecor(AppCompatDelegateImpl.java:555)
        at android.support.v7.app.AppCompatDelegateImpl.ensureSubDecor(AppCompatDelegateImpl.java:518)
        at android.support.v7.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:466)
        at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
        at com.example.lxiao.workpreapre2.ActivityTest.activityMain2.onCreate(activityMain2.java:19)
        at android.app.Activity.performCreate(Activity.java:6682)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2619)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2727) 
        at android.app.ActivityThread.-wrap12(ActivityThread.java) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1478) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:154) 
        at android.app.ActivityThread.main(ActivityThread.java:6121) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779) 

解决:透明Activity要继承Activity类

https://blog.csdn.net/zhangwenchaochao/article/details/78654128

3. Unable to resolve dependency for ':app@debug/compileClasspath': Could not download xxx

配置:Window10,AS 3.1.3, buildToolsVersion:28.0.1, compileSdkVersion 28

解决:

(1)

(2)

(3) fan qiang(亲猜最有效)

参考:https://blog.csdn.net/collorye/article/details/79173784

(4) 若以上三种都不行,很可能该依赖库不存在(见15),换成低版本的API

4. Ubuntu下adb devices:???????no permissions 问题

配置:Ubuntu16.04

解决:https://www.cnblogs.com/xiaoxuetu/p/3224386.html

5. No toolchains found in the NDK toolchains folder for ABI with prefix: mips64el-linux-android

配置:Ubuntu16.03,AS3.1.3

解决:https://blog.csdn.net/qq_24118527/article/details/82867864

最后只要在toolchains目录下执行ln -sf aarch64-linux-android-4.9 mips64el-linux-android即可,见评论2。

6. Manifest merger failed : Attribute application@appComponentFactory value=(android.support.v4.app.CoreComponentFactory) from [com.android.support:support-compat:28.0.0] AndroidManifest.xml:22:18-91

配置:Window10,AS3.1.3,Build Tools:28.0.1

前提:添加Dexter6.0.1依赖库(implementation 'com.karumi:dexter:6.0.1')后 build时报错

原因:AndroidX和Android Support库共存问题

解决:

(1) 法一:根据提示在<application ...>中添加代码

android:appComponentFactory=""
tools:replace="android:appComponentFactory"

参考:https://blog.csdn.net/zxwd2015/article/details/86651216

(2) 法二:参考https://www.jianshu.com/p/f7a7a8765294:还没看

7. Error:Execution failed for task ‘:app:transformDexArchiveWithExternalLibsDexMergerForDebug’.
》com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex。。

配置:Window10,AS3.1.3,Build Tools:28.0.1

前提:添加Dexter6.0.1依赖库(implementation 'com.karumi:dexter:6.0.1')后 build时报错

原因:包引用重复

解决:

(1) 法一:在module的build.gradle的defaultConfig添加 "multiDexEnabled true"

参考:https://blog.csdn.net/sparkleyn/article/details/79027796

补充:同时对multiDexEnabled的解释,粗略看了下这文章https://www.cnblogs.com/wingyip/p/4496028.html

好像不错,日后再读。总的说multiDexEnabled就是分Dex,因为ART之前Dex文件对方法索引用short类型存储,导

致最大方法数是65536,因此当项目足够大包含方法数(包括引用的外部Lib里的所有方法)超过65536,就会报 错。

(2) 法二:在module的build.gradle的dependencies里把 implementation 'com.android.support:appcompat-v7:28.0.0' 注释掉

参考:https://www.it72.com/thread-12286.htm

补充:我用控制变量法,发现是添加了Dexter依赖的问题,但要用该库,所以注释了 implementation

'com.android.support:appcompat-v7:28.0.0'。

8. Execution failed for task ':app:transformResourcesWithMergeJavaResForDebug'.
> More than one file was found with OS independent path 'META-INF/androidx.legacy_legacy-support-core-utils.version'

配置:Window10,AS3.1.3,Build Tools:28.0.1

前提:按照7中的法一解决问题后,出现该问题。

原因:AndroidX和Android Support库不能共存

解决:6,7,8三个是连在一起的,我用了6的法一,7的法一,到这里build没问题,但Run app就有问题,说明还是没解决AndroidX和Android Support问题,这两个概念之后要仔细整理下。

先解决问题,我首先根据网上多数说的方法,在build.gradle(Module:app)中添加如下代码

    packagingOptions {
        exclude 'META-INF/androidx.legacy_legacy-support-core-utils.version'
    }

但Run app时又出现了相似问题,只是路径不同而已。那这看来不是正确解决方法。参照https://www.cnblogs.com/machach/p/10243528.html,正确解决方法是回退依赖库,看了下Dexter6.0.1源码的build.gradle

确实导入了androidx依赖,那就回退到5.0.0版本,解决问题。

9. 将assets中资源作为File对象失败

前提:想将assets中资源作为File对象进行本地读取

原因:assets是在apk中的,无法实现

解决:如要读取assets资源,使用AssetManager

参考:https://www.cnblogs.com/spring87/p/5990156.html

10. Caused by: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.

前提:使用Material Design的ToolBar

解决:使用自定义style,去掉actionbar

参考:https://www.cnblogs.com/hh9601/p/6404728.html

11. AS突然不显示Logcat日志

前提:AS3.1.3,小米9(Android9)

解决:

(1) 重启

12. AS查找运行时问题步骤

前提:AS3.1.3,Win10

解决:根据以下顺序

(1) 查看Run;

(2) 查看Logcat

(3) Debug;

(4) 打log;

13. AS引入javax包(包括ImageIO等类)

前提:AS3.1.3,Win10

解决:

(1) 找到AS中rt.jar路径;

(2) 在当前Module的build.gradle中添加

compile files ('path/to/rt.jar')

参考:https://blog.csdn.net/qqyanjiang/article/details/50161753

14. java.lang.UnsatisfiedLinkError: No implementation found for long org.opencv.core.Mat.n_Mat() (tried Java_org_opencv_core_Mat_n_1Mat and Java_org_opencv_core_Mat_n_1Mat__)

前提:AS3.1.3,Win10

解决:添加对so的依赖

参考:https://blog.csdn.net/u012328159/article/details/81094436 第三、四步

15. ERROR: Unable to resolve dependency for ':app@debug/compileClasspath': Could not find any version that matches com.android.support:appcompat-v7:30.+.(待完善)

前提:AS3.1.3,Win10,new project时sync报错

原因:androidx和android support关系

解决

(1) 将

implementation 'com.android.support:appcompat-v7:30.+'替换为
implementation 'androidx.appcompat:appcompat:1.1.0'

参考:https://blog.csdn.net/qq_33210042/article/details/103409695

16. Android App闪退(待完善)

解决:

(1) 检查View和资源id类型是否匹配(出现过ImageView和TextView的id进行findViewById导致的情况);

17. Error:Server returned HTTP response code: 403 for URL: http://services.gradle.org/distributions/gradle-4.x-all.zip

前提:AS3.1.3,Win10

原因:http协议不行

解决:

在gradle-wrapper.properties中改成https

18. AS导入jar

前提:AS3.5,Win10

参考:https://www.cnblogs.com/lgqrlchinese/p/9959709.html

19. 警告:API 'variant.getJavaCompile()' is obsolete and has been replaced with 'variant.getJavaCompileProvider()'

待解决

20. git clone报错“fatal: unable to access 'https://github.com/wkxjc/CustomViewDemo/': SSL certificateproblem: unable to get local issuer certificate”

前提:git 2.28.0,Win10

解决:命令行上运行 git config --global http.sslVerify false 将安全验证关掉

参考https://blog.csdn.net/soindy/article/details/41088169

21. 修改模块名

前提:AS4.0.1,Win10

解决

(1) 右键module->Refactor->rename module and directory;

(2) 在settings.gradle中include ‘’刚改过的名字。

22. imgView.setImageBitmap无法显示

前提:AS4.0.1,Win10

解决:

(1) 把targetSdkVersion注释;(验证)

参考:https://blog.csdn.net/whucyl/article/details/9101563

(2)修改Bitmap的显示比例;(未验证)

23. Android历史版本下载

url:https://developer.android.google.cn/studio/archive?hl=zh-cn

24. ERROR: This version of Android Studio cannot open this project, please retry with Android Studio 4.0

前提:AS4.0.1,Win10

解决:将project的build.gradle中如下改为自己as对应版本(我的是as3.5.3)

25. ERROR: Cause: unable to find valid certification path to requested target

前提:AS3.4,Win10

解决:在setting中开proxy

26. Error:android java.lang.UnsatisfiedLinkError: No implementation found for long org.opencv.core.Mat.n_Mat

前提:AS3.1.3,Win10

原因:没有加载openCV4Android的库

解决:

在Activity中添加如下代码,并调用opencv4Loader():

    private BaseLoaderCallback mLoaderCallback=new BaseLoaderCallback(this) {
        @Override
        public void onManagerConnected(int status){
            switch (status) {
                case LoaderCallbackInterface.SUCCESS: {
                    Log.d("waterMark1", "OpenCV loaded successfully");
                }
                break;
                default: {
                    super.onManagerConnected(status);
                }
                break;
            }
        }
    };

    private void opencv4Loader(){
        if(!OpenCVLoader.initDebug()){
            Log.d("waterMark1", "Internal OpenCV library not found. Using OpenCV Manager for initialization");
            OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_0_0, this, mLoaderCallback);
        }else{
            Log.d("waterMark1","OpenCV library found inside package. Using it!");
            mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
        }
    }

参考:https://www.cnblogs.com/feijian/p/6652401.html

27. 点“Attach Debugger to Android Process”出现debug info can be unavailable. Please close other application using ADB: Monitor, DDMS, Eclipse错误

前提:AS3.1.3,Win10

解决:

(1) 重启AS;

28. 华为EMUI手动装apk包时出现“无效安装包 与操作系统不兼容”错误

前提:AS4.0.1,Win10,EMUI Android 9

错误:第一次手动安装apk-debug正常,第二次手动安装改后的apk-debug时出现

原因:参考https://blog.csdn.net/lk2021991/article/details/91615656

EMUI改了Android的debug签名验证机制,如果用

生成,会导致EMUI无法解析。

解决:参考:https://blog.csdn.net/qq_30000411/article/details/102531258

按一按下步骤

(1) Clean Project

(2) 用

build

29. 多线程调试时“Paused in another thread“

前提:AS4.0.1,Win10

解决:进入报错的函数内部继续调试定位问题

30. AS的build.gradle(project)和gradle-wrapper.properties对应列表

前提:Win10

列表

ASbuild.gradle(project)gradle-wrapper.properties
3.1.33.1.34.4.1
4.0.14.0.16.1.1

31. java.lang.IllegalStateException: Cannot call this method while RecyclerView is computing a layout or scrolling

Todo

32. Could not reset the state on your devices

前提:问题

解决

(1) 重启app;

(2) 重启AS;

(3) 重启手机;

33. The layout "load_layout1" in layout has no declaration in the base layout folder; this can lead to crashes when the resource is queried in a configuration that does not match this qualifier

前提:在layout中添加新布局后,在布局中报错

解决:File => Invalidate Caches / Restart => Invalidate and Restart.

参考https://stackoverflow.com/questions/52547657/the-layout-layout-in-layout-has-no-declaration-in-the-base-layout-folder-erro

34. Unsupported Modules Detected: Compilation is not supported for following modules:xx. Unfortunately you can't have non-Gradle Java modules and Android-Gradle modules in one project.

前提:从网上down一个demo,在Build时报错

解决:删除.idea文件-》重新sync

这里.idea如下

参考https://www.jianshu.com/p/8c83db4daeae

35. 在AS无法导入库

前提:alt+enter指定类无法import

解决:重启AS

36. Dependent features configured but no package ID was set.

前提:在app module A依赖app module B(在A的build.gradle中添加了implementation project(":A"))后在build时报错

原因:app module只能依赖library module

解决:将app module B改为library module,按以下步骤

(1) 把B的build.gradle顶部改成 apply plugin: 'com.android.application' ;

(2) 删除B的build.gradle中android block中的applicationId行。

参考https://cloud.tencent.com/developer/article/1326481

37. android.os.NetworkOnMainThreadException

前提:在onCreate中用

     InetAddress ip2=InetAddress.getByName("www.baidu.com");

原因:在>=android3.0后,在主线程进行网络操作会抛此exception。

解决:把网络操作放子线程。

参考https://developer.android.com/reference/android/os/NetworkOnMainThreadException

https://www.jianshu.com/p/dd14279221cb

38. no suspicious code found

前提:使用lint扫描全局时报错

解决

(1) 法一:重启as再扫描

38. INSTALL_FAILED_VERSION_DOWNGRADE

前提:用adb install时报错,当前手机已有旧commit的apk,要装新commit的apk

解决:adb install -r -d “apk名“

参考https://blog.csdn.net/qq_39493848/article/details/100731960

39. 使用lint查找无引用资源时的问题

前提:用as的lint查找”unused resources“时有bug

问题

(1) 查找出的无引用资源中有的资源是有引用的,需手动复查;

(2) 用”remove declarations for xx“删除无引用资源会删除非预期资源,需用commit复查;

40. 切换到别的commit时直接build报错(存在xxGradle版本不支持的特性)

解决:切换到别的commit后先sync再build

41. layout inspector无法显示布局(nothing to show)

解决

(1) 重启app;

(2) 重启AS;

(3) 重启手机;

42. AS无法显示整个界面

前提:突然无法显示整个界面,但底部图标能点击

解决:删除AS配置文件(C:\Users\用户\.AndroidStudioxx)-》重启AS

43. 打开较大hprof导致AS ANR

解决:修改AS的堆内存大小

参考https://www.jianshu.com/p/03b42798531d

44. AS debug/用layout inspector 时显示“no debuggable processes”

解决

(1) 关闭整个AS进程并重启;

(2) 拔掉线重连手机;

45. 用LeakCanary抓到leak时报错Heap analysis failed(Kotlin.kotlinNullPointerException)

前提

LeakCanary的Heap Dumps中stacktrace如下

kotlin.KotlinNullPointerException
 at shark.internal.KeyedWeakReferenceMirror$Companion.fromInstance(KeyedWeakReferenceMirror.kt:34)
 at shark.KeyedWeakReferenceFinder$findKeyedWeakReferences$1$addedToContext$2.invoke(KeyedWeakReferenceFinder.kt:49)
 at shark.KeyedWeakReferenceFinder$findKeyedWeakReferences$1$addedToContext$2.invoke(KeyedWeakReferenceFinder.kt:10)
 at kotlin.sequences.TransformingSequence$iterator$1.next(Sequences.kt:172)
 at kotlin.sequences.FilteringSequence$iterator$1.calcNext(Sequences.kt:132)
 at kotlin.sequences.FilteringSequence$iterator$1.hasNext(Sequences.kt:156)
 at kotlin.sequences.SequencesKt___SequencesKt.toCollection(_Sequences.kt:722)
 at kotlin.sequences.SequencesKt___SequencesKt.toMutableList(_Sequences.kt:752)
 at kotlin.sequences.SequencesKt___SequencesKt.toList(_Sequences.kt:743)
 at shark.KeyedWeakReferenceFinder$findKeyedWeakReferences$1.invoke(KeyedWeakReferenceFinder.kt:54)
 at shark.KeyedWeakReferenceFinder$findKeyedWeakReferences$1.invoke(
 KeyedWeakReferenceFinder.kt:10)
 at shark.GraphContext.getOrPut(GraphContext.kt:23)
 at shark.KeyedWeakReferenceFinder.findKeyedWeakReferences$shark(KeyedWeakReferenceFinder.kt:35)
 at shark.KeyedWeakReferenceFinder.findLeakingObjectIds(KeyedWeakReferenceFinder.kt:13)
 at shark.HeapAnalyzer.analyzeGraph(HeapAnalyzer.kt:160)
 at shark.HeapAnalyzer.analyze(HeapAnalyzer.kt:99)
 at leakcanary.internal.HeapAnalyzerService.analyzeHeap(HeapAnalyzerService.kt:83)
 at leakcanary.internal.HeapAnalyzerService.onHandleIntentInForeground(HeapAnalyzerService.kt:60)
 at leakcanary.internal.ForegroundService.onHandleIntent(ForegroundService.kt:55)
 at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:78)
 at android.os.Handler.dispatchMessage(Handler.java:107)
 at android.os.Looper.loop(Looper.java:238)
 at android.os.HandlerThread.run(HandlerThread.java:67)

Build.VERSION.SDK_INT: 29
Build.MANUFACTURER: OPPO
LeakCanary version: 2.5
Analysis duration: 1540 ms

hprof:见https://github.com/Eric-Li-2356/leakcanary-bug

解决:Todo

参考https://github.com/square/leakcanary/issues/1992

46. Unknown HPROF Version (JAVA PROFILE 1.0.3) (java.io.IOException)

前提:将leakcanary获取的hprof放入MAT报错

原因:The hprof file you get from Android has android specific format. You should convert hprof file take from Android OS into standard hprof format.

解决

For this you can use hprof-conv tool that is located at AndroidSDK/tools/hprof-conv.

For example:

hprof-conv android.hprof mat.hprof

参考https://stackoverflow.com/questions/6219049/error-opening-hprof-file-ioexception-unknown-hprof-version

47. java.io.IOException: Could not delete lib xx

前提:想删除一个external library的jar,报错

解决:在项目根目录运行 gradlew clean清gradle缓存-》重新删

参考https://blog.csdn.net/qq_33323251/article/details/79379251

48. Build Failed:Duplicate class xx found in modules A.jar(xx) and B.jar(xx)

前提:项目中通过如下方式

(1) project的build.gradle中添加库;

(2) project的build.gradle中buildscript的dependencies中加插件 class 'xx';

(3) module的build.gradle中android闭包之后引入插件 apply plugin:‘xx’;

引入另个依赖库并sync后,在Run时报Build failed,duplicate class 。。。

原因:引入的依赖库存在和已有库重复的类

解决:在project的build.gradle中添加如下配置去除重复依赖

https://docs.oracle.com/javase/specs/jls/se7/html/jls-4.html

49. Warning:debug info can be unavailable. Please close other application using ADB:Monitor, DDMS, Eclipse

前提:Win10,AS4.0.1,打开过android device monitor,报了adb端口冲突 -》 关闭android device monitor,点debug报错

解决

(1) 输入 adb usb;

(2) 重启电脑(关闭后台adb应用);

:AS通过环境变量调用adb

50. make aar时报错

前提:make aar时报下错

解决:换个好代理

51. Cause: dl.google.com:443 failed to respond

前提:sync时报错

解决

在proxy setting中check下dl.google.com是否连通:

若不能通说明代理问题;

52. no launcher activity found

解决:

(1)查看activity是否在manifest中有category设launcher;

(2) 重建app module,copy;

53. AS Build时报错出现乱码

解决:

(1) Help-》Edit Custom VM Options:添加 -Dfile.encoding=UTF-8

(2) Invalidate Caches/Restart

 

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

前提:在service用startactivity跳activity报错

解决:code中加

参考https://blog.csdn.net/fang323619/article/details/74388804

https://blog.csdn.net/u010389391/article/details/78558475

55. AS布局预览不显示

解决:

(1) design界面force refresh layout

参考:https://blog.csdn.net/weixin_42863849/article/details/100022063

56. AS引入material design

参考https://material.io/develop/android/docs/getting-started

57. 查找手机上指定安装包

解决:adb shell-》pm list packages | grep "keyword"

58. Unable to resolve dependency for 'xx module@debug/compileClasspath': Could not resolve project: xx module

前提:使用as辅助的为某个module添加依赖module后,sync报如下错

解决:todo

59. AS显示Logcat crashes with error: unexpected EOF

解决:在手机 设置-》开发者选项 中把“日志记录器缓冲器大小”设大点或关闭

参考https://stackoverflow.com/questions/48689930/logcat-crashes-with-error-unexpected-eof/48704727

60. AS在启动时进入debug模式闪退

前提:在主线程中下断点闪退

解决:去掉断点(原因待纠)

参考https://stackoverflow.com/questions/40618803/android-app-crashes-when-launched-in-debug-mode

61. AS用layout inspector时app闪退

前提:AS4.0.1

解决

按以下步骤依次尝试:

(1) adb kill-server-》adb start-server;

(2) 重启app;

(3) 重启AS;

(4) 重启手机;

62. AS中Gradle Build时报错:请求的操作无法在使用用户映射区域打开的文件上

解决

(1) 重启AS

63. AS调试时断点不可用(No executable code found)解决方案

解决

(1) clean整个项目;
(2) Ctr+F9 执行make project;

(3) 重新启动项目debug;

参考

https://www.jianshu.com/p/be59fdce1e6a

特例

(1)

64. SSL peer shut down incorrectly

解决:Todo

参考https://blog.csdn.net/shanfuming/article/details/86472493

65. no such instance field/no such static field

前提:debugger时变量显示如上

解决:关混淆(具体buildType设minifyEnabled false)

参考https://blog.csdn.net/niuba123456/article/details/99820528

66. Android断点调试时闪退

前提:AS4.0.1

解决:todo

67. Android Studio无法新建module

前提:AS4.0.1右键项目名new无module选项

解决:Invalidate and Restart

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