有疑问可参看lint处理
官方相关
最近一周做了一些关于Android静态代码检测的东西，对于一些常见的lint警告做了记录,其实对于常见的lint警告我们得处理步骤可以分为如下：
- 查看lint报错的错误类型
- 追踪到代码处，确定是否代码自身问题
- 分析该类错误影响范围
- 确定解决方式(规范代码、添加注解、添加规则)
规范代码
一般是由于开发者在开发时，不细心造成误写等，或者是某些API过时，需要进行手动修改。
添加注解
对于某些特殊需求，可以通过加注解来避免lint报错,以下给出常见的添加注解的地方
java源代码
@SuppressLint("xxxx") // xxxx代表某种lint检测类型
public void test(){
}
xml
首先添加命名空间
namespace xmlns:tools="http://schemas.android.com/tools"
然后在报错地方添加
tools:ignore="xxxx"
添加规则(lint.xml文件)
对于某些大规模类型的，或者是知道自己必须这么干时，就可以添加规则来规避某种类型的所有lint报错或者是指定路径，亦或者是通过正则指定。
添加规则格式为：
规避一种类型
指定路径
改变lint检测类型
接下来记录下我见到和处理的一些报错类型
1. Missing commit() on SharedPreference editor
缺少commit()方法调用，添加即可;但是你或许会遇到下面这个问题,它依然会lint检测报错：
public void test(){
SharedPreferencesUtils.apply(dataStore.edit() .putString(xxx, xxx));
}
.
.
.
public static void apply(SharedPreferences.Editor editor) {
editor.apply();
}
如果是这样的话，建议到指定方法调用处添加注解
@SuppressLint(“CommitPrefEdits")
2. Use apply() on SharedPreferences
建议使用apply()替换commit(),对于两个方法的区别，建议看看这里
3. Mismatched Styleable/Custom View Name
建议在自定义View的时候，尽量保证View名称与
@SuppressLint(“CustomViewStyleable")
若存在特殊需求，则更建议在lint.xml中添加规则:
4. Duplicate ids across layouts combined with include tags
在布局中，通过
5. Using android.media.ExifInterface
Avoid using android.media.ExifInterface;use android.support.media.ExifInterface from the support library instead.
使用support包相关替换
6. Hardcoded reference to /sdcard
Do not hardcode "/data/"; use Context.getFilesDir().getPath() instead
lint 给出的修改建议是使用Context.getFilesDir().getPath() 替换直接通过路径拼接，但是根据场景可以自变吧；若不想通过这种方式可以直接忽略，添加注解
类似错误场景：
public class DbCopyHelper {
public static final String DB_PATH = "/data/data/" + BuildConfig.APPLICATION_ID + "/databases/";
public static void copy(Context context, String dbName, boolean force) throws Exception {
File dir = new File(DB_PATH);
@SuppressLint(“ SdCardPath")
若存在特殊需求，则更建议在lint.xml中添加规则:
7. Attribute unused on older versions
建议添加规则
8. Appcompat Custom Widgets
This custom view should extend android.support.v7.widget.AppCompatTextView instead
建议:
添加规则
9. Restricted API
xxx can only be called from within the same library group
方法只能在同一个library group中调用
添加注解:
@SuppressLint(“RestrictedApi”)
或者是规则
10. Invalid format string
在进行字符串格式化处理的时候，需要注意formatted=“false” 的影响
直接添加：
对于formatted=“false”的理解,在进行string.xml编写的时候，注意内容的占位符号，如果大于等于2个占位符的时候，建议使用formatted=“false”，或者使用正则方式%n$m。
11. Insecure HostnameVerifier
HostnameVerifier hnv = new HostnameVerifier() {
@Override
public boolean verify(String hostname, SSLSession session) {
return true;
}
};
场景是直接均返回true，被认为是不安全的操作，若知道自己在干什么，可以直接添加注解
@SuppressLint("AllowAllHostnameVerifier")
或者添加规则
12. Insecure TLS/SSL trust manager
@Override
public void checkServerTrusted(X509Certificate[] chain, String authType) throws
CertificateException {
}
建议添加规则
13. Obsolete layout params
Invalid layout param in a LinearLayout: layout_centerInParent
建议开发中，对布局的使用注意可用性，在参考代码的时候，注意删除修改后不可用的属性
14. Static Field Leaks
注意在书写单例的时候，避免使用局部context.均转换为全局上下文
15. Node can be replaced by a TextView with compound drawables
这个警告的产生，主要是在一个线性布局中存在一个textView和一个ImageView，认为一个textView可以实现类似的功能，而不用添加多余的嵌套和View；
但是对于特定的需求，不能保证能实现想要的效果，因此建议添加规则忽略：
16. View Holder Candidates
Unconditional layout inflation from view adapter: Should use View Holder pattern (use recycled view passed into this method as the second parameter) for smoother scrolling
建议使用ViewHolder
17. Missing baselineAligned attribute
缺少baselineAligned这个属性，建议看看这里，这个警告可以根据需求自行添加属性与否，或者是添加规则和注解：
18. Inefficient layout weight
在使用layout weight属性的时候，应保持相应属性为0dp;或者是在copy代码的时候忘记删除layout_weight代码导致lint检测报错
19. Nested layout weights
在布局进行嵌套使用时，父布局与子布局都使用了android:layout_weight，根据需求进行修改;
20. Useless parent layout
警告有未使用的父布局，或者是无用的父布局。
根据实际需求进行忽略或者是删除相应布局
21. Unused namespace
命名空间重复添加，或者是删除对应属性后，命名空间未删除，删除.
22. Hyphen can be replaced with dash
Replace "-" with an "en dash" character (–, –)
为了符合人性化的开发，建议直接添加规则忽略
23. H Ellipsis string can be replaced with ellipsis character
处理同上
24. Duplicated icons under different names
存在不同命名的同文件的icons
目前的处理是添加规则忽略
25. Missing accessibility label
对EditTextView的使用，建议添加一个它的标签View
根据需要进行忽略 或者添加android:labelfor
26. Keyboard inaccessible widget
一个控件（比如图片），如果没有定义focusable(可聚焦的)，却定义了是clickable（可点击的），那么是不能通过键盘访问的。所以，需要添加一个focusable=“true”;相当于指定可获取焦点.
27. Usage of showAsAction=always
建议使用"ifRoom"替换"always"
根据需求进行修改或者忽略
28. Missing inputType
This text field does not specify an inputType
建议为EditText指定inputType属性
29. Overdraw: Painting regions more than once
Possible overdraw: Root element paints background @color/actionbar_color with a theme that also paints a background (inferred theme is @style/ActionTheme_NoTitle)
存在过度绘制的可能性
但是这个报警有点牵强，所以还是先添加规则给过滤吧
30. Hardware Id Usage
获取设备相关信息，可以查看官方API,使用其替换方法
31. Incompatible Gradle Versions
不兼容依赖版本库，可通过打依赖树，进行查找
贴出常见的lint issueid和秒速，以供对照
"ContentDescription": Image without contentDescription
"AddJavascriptInterface": addJavascriptInterface Called
"ShortAlarm": Short or Frequent Alarm
"AllCaps": Combining textAllCaps and markup
"AllowAllHostnameVerifier": Insecure HostnameVerifier
"AlwaysShowAction": Usage of showAsAction=always
"InvalidUsesTagAttribute": Invalid name attribute for uses element.
"MissingIntentFilterForMediaSearch": Missing intent-filter with action
android.media.action.MEDIA_PLAY_FROM_SEARCH
"MissingMediaBrowserServiceIntentFilter": Missing intent-filter with action
android.media.browse.MediaBrowserService.
"MissingOnPlayFromSearch": Missing onPlayFromSearch.
"ImpliedTouchscreenHardware": Hardware feature touchscreen not explicitly
marked as optional
"MissingTvBanner": TV Missing Banner
"MissingLeanbackLauncher": Missing Leanback Launcher Intent Filter.
"MissingLeanbackSupport": Missing Leanback Support.
"PermissionImpliesUnsupportedHardware": Permission Implies Unsupported
Hardware
"UnsupportedTvHardware": Unsupported TV Hardware Feature
"SupportAnnotationUsage": Incorrect support annotation usage
"ShiftFlags": Dangerous Flag Constant Declaration
"LocalSuppress": @SuppressLint on invalid element
"SwitchIntDef": Missing @IntDef in Switch
"UniqueConstants": Overlapping Enumeration Constants
"InlinedApi": Using inlined constants on older versions
"Override": Method conflicts with new inherited method
"ObsoleteSdkInt": Obsolete SDK_INT Version Check
"NewApi": Calling new methods on older versions
"UnusedAttribute": Attribute unused on older versions
"AppCompatMethod": Using Wrong AppCompat Method
"AppCompatCustomView": Appcompat Custom Widgets
"AppCompatResource": Menu namespace
"GoogleAppIndexingApiWarning": Missing support for Firebase App Indexing Api
"GoogleAppIndexingWarning": Missing support for Firebase App Indexing
"AppLinksAutoVerifyError": App Links Auto Verification Failure
"AppLinksAutoVerifyWarning": Potential App Links Auto Verification Failure
"AppLinkUrlError": URL not supported by app for Firebase App Indexing
"TestAppLink": Unmatched URLs
"InconsistentArrays": Inconsistencies in array element counts
"Assert": Assertions
"BadHostnameVerifier": Insecure HostnameVerifier
"BatteryLife": Battery Life Issues
"BackButton": Back button
"ButtonCase": Cancel/OK dialog button capitalization
"ButtonOrder": Button order
"ButtonStyle": Button should be borderless
"ByteOrderMark": Byte order mark inside files
"MissingSuperCall": Missing Super Call
"AdapterViewChildren": AdapterViews cannot have children in XML
"ScrollViewCount": ScrollViews can have only one child
"PermissionImpliesUnsupportedChromeOsHardware": Permission Implies Unsupported
Chrome OS Hardware
"UnsupportedChromeOsHardware": Unsupported Chrome OS Hardware Feature
"GetInstance": Cipher.getInstance with ECB
"CommitTransaction": Missing commit() calls
"Recycle": Missing recycle() calls
"CommitPrefEdits": Missing commit() on SharedPreference editor
"ApplySharedPref": Use apply() on SharedPreferences
"ClickableViewAccessibility": Accessibility in Custom Views
"EasterEgg": Code contains easter egg
"StopShip": Code contains STOPSHIP marker
"MissingConstraints": Missing Constraints in ConstraintLayout
"VulnerableCordovaVersion": Vulnerable Cordova Version
"CustomViewStyleable": Mismatched Styleable/Custom View Name
"CutPasteId": Likely cut & paste mistakes
"SimpleDateFormat": Implied locale in date format
"SetTextI18n": TextView Internationalization
"Deprecated": Using deprecated resources
"MissingPrefix": Missing Android XML namespace
"MangledCRLF": Mangled file line endings
"DuplicateIncludedIds": Duplicate ids across layouts combined with include
tags
"DuplicateIds": Duplicate ids within a single layout
"DuplicateDefinition": Duplicate definitions of resources
"ReferenceType": Incorrect reference types
"StringEscaping": Invalid string escapes
"UnpackedNativeCode": Missing android:extractNativeLibs=false
"UnsafeDynamicallyLoadedCode": load used to dynamically load code
"UnsafeNativeCodeLocation": Native code outside library directory
"EllipsizeMaxLines": Combining Ellipsize and Maxlines
"ExifInterface": Using android.media.ExifInterface
"ExtraText": Extraneous text in resource files
"FieldGetter": Using getter instead of field
"InvalidAnalyticsName": Invalid Analytics Name
"MissingFirebaseInstanceTokenRefresh": Missing Firebase Instance ID Token
Refresh
"FontValidationError": Validation of font files
"FontValidationWarning": Validation of font files
"FullBackupContent": Valid Full Backup Content File
"ValidFragment": Fragment not instantiatable
"GetContentDescriptionOverride": Overriding getContentDescription() on a View
"PackageManagerGetSignatures": Potential Multiple Certificate Exploit
"AccidentalOctal": Accidental Octal
"UseOfBundledGooglePlayServices": Use of bundled version of Google Play
services
"GradleCompatible": Incompatible Gradle Versions
"GradleDependency": Obsolete Gradle Dependency
"GradleDeprecated": Deprecated Gradle Construct
"DevModeObsolete": Dev Mode Obsolete
"DuplicatePlatformClasses": Duplicate Platform Classes
"GradleGetter": Gradle Implicit Getter Call
"GradlePluginVersion": Incompatible Android Gradle Plugin
"HighAppVersionCode": VersionCode too high
"GradleIdeError": Gradle IDE Support Issues
"GradlePath": Gradle Path Issues
"GradleDynamicVersion": Gradle Dynamic Version
"NotInterpolated": Incorrect Interpolation
"StringShouldBeInt": String should be int
"NewerVersionAvailable": Newer Library Versions Available
"MinSdkTooLow": API Version Too Low
"GridLayout": GridLayout validation
"HandlerLeak": Handler reference leaks
"HardcodedDebugMode": Hardcoded value of android:debuggable in the manifest
"HardcodedText": Hardcoded text
"HardwareIds": Hardware Id Usage
"IconDuplicatesConfig": Identical bitmaps across various configurations
"IconDuplicates": Duplicated icons under different names
"GifUsage": Using .gif format for bitmaps is discouraged
"IconColors": Icon colors do not follow the recommended visual style
"IconDensities": Icon densities validation
"IconDipSize": Icon density-independent size validation
"IconExpectedSize": Icon has incorrect size
"IconExtension": Icon format does not match the file extension
"IconLauncherShape": The launcher icon shape should use a distinct silhouette
"IconLocation": Image defined in density-independent drawable folder
"IconMissingDensityFolder": Missing density folder
"IconMixedNinePatch": Clashing PNG and 9-PNG files
"IconNoDpi": Icon appears in both -nodpi and dpi folders
"IconXmlAndPng": Icon is specified both as .xml file and as a bitmap
"ConvertToWebp": Convert to WebP
"WebpUnsupported": WebP Unsupported
"IncludeLayoutParam": Ignored layout params on include
"DisableBaselineAlignment": Missing baselineAligned attribute
"InefficientWeight": Inefficient layout weight
"NestedWeights": Nested layout weights
"Orientation": Missing explicit orientation
"Suspicious0dp": Suspicious 0dp dimension
"InstantApps": Instant App Issues
"DuplicateDivider": Unnecessary Divider Copy
"TrustAllX509TrustManager": Insecure TLS/SSL trust manager
"InvalidImeActionId": Invalid imeActionId declaration
"InvalidPackage": Package not included in Android
"DrawAllocation": Memory allocations within drawing code
"UseSparseArrays": HashMap can be replaced with SparseArray
"UseValueOf": Should use valueOf instead of new
"JavascriptInterface": Missing @JavascriptInterface on methods
"JobSchedulerService": JobScheduler problems
"KeyboardInaccessibleWidget": Keyboard inaccessible widget
"LabelFor": Missing labelFor attribute
"InconsistentLayout": Inconsistent Layouts
"InflateParams": Layout Inflation without a Parent
"StaticFieldLeak": Static Field Leaks
"DefaultLocale": Implied default locale in case conversion
"LocaleFolder": Wrong locale name
"GetLocales": Locale crash
"InvalidResourceFolder": Invalid Resource Folder
"WrongRegion": Suspicious Language/Region Combination
"UseAlpha2": Using 3-letter Codes
"LogConditional": Unconditional Logging Calls
"LongLogTag": Too Long Log Tags
"LogTagMismatch": Mismatched Log Tags
"AllowBackup": AllowBackup/FullBackupContent Problems
"MissingApplicationIcon": Missing application icon
"DeviceAdmin": Malformed Device Admin
"DuplicateActivity": Activity registered more than once
"DuplicateUsesFeature": Feature declared more than once
"GradleOverrides": Value overridden by Gradle build script
"IllegalResourceRef": Name and version must be integer or string, not
resource
"MipmapIcons": Use Mipmap Launcher Icons
"MockLocation": Using mock location provider in production
"MultipleUsesSdk": Multiple elements in the manifest
"ManifestOrder": Incorrect order of elements in manifest
"MissingVersion": Missing application name/version
"OldTargetApi": Target SDK attribute is not targeting latest version
"UniquePermission": Permission names are not unique
"UsesMinSdkAttributes": Minimum SDK and target SDK attributes not defined
"WearableBindListener": Usage of Android Wear BIND_LISTENER is deprecated
"WrongManifestParent": Wrong manifest parent
"InvalidPermission": Invalid Permission Attribute
"ManifestResource": Manifest Resource References
"ManifestTypo": Typos in manifest tags
"FloatMath": Using FloatMath instead of Math
"MergeMarker": Code contains merge marker
"MergeRootFrame": FrameLayout can be replaced with tag
"IncompatibleMediaBrowserServiceCompatVersion": Obsolete version of
MediaBrowserServiceCompat
"InnerclassSeparator": Inner classes should use $ rather than .
"Instantiatable": Registered class is not instantiatable
"MissingRegistered": Missing registered class
"MissingId": Fragments should specify an id or tag
"LibraryCustomView": Custom views in libraries should use res-auto-namespace
"ResAuto": Hardcoded Package in Namespace
"NamespaceTypo": Misspelled namespace declaration
"UnusedNamespace": Unused namespace
"NegativeMargin": Negative Margins
"NestedScrolling": Nested scrolling widgets
"NetworkSecurityConfig": Valid Network Security Config File
"MissingBackupPin": Missing Backup Pin
"PinSetExpiry": Validate expiration attribute
"NfcTechWhitespace": Whitespace in NFC tech lists
"UnlocalizedSms": SMS phone number missing country code
"ObjectAnimatorBinding": Incorrect ObjectAnimator Property
"AnimatorKeep": Missing @Keep for Animated Properties
"ObsoleteLayoutParam": Obsolete layout params
"OnClick": onClick method does not exist
"Overdraw": Overdraw: Painting regions more than once
"DalvikOverride": Method considered overridden by Dalvik
"OverrideAbstract": Not overriding abstract methods on older platforms
"ParcelCreator": Missing Parcelable CREATOR field
"UnusedQuantity": Unused quantity translations
"MissingQuantity": Missing quantity translation
"ImpliedQuantity": Implied Quantities
"ExportedPreferenceActivity": PreferenceActivity should not be exported
"PrivateApi": Using Private APIs
"PackagedPrivateKey": Packaged private key
"PrivateResource": Using private resources
"ProguardSplit": Proguard.cfg file contains generic Android rules
"Proguard": Using obsolete ProGuard configuration
"PropertyEscape": Incorrect property escapes
"UsingHttp": Using HTTP instead of HTTPS
"SpUsage": Using dp instead of sp for text sizes
"InOrMmUsage": Using mm or in dimensions
"PxUsage": Using 'px' dimension
"SmallSp": Text size is too small
"ParcelClassLoader": Default Parcel Class Loader
"PendingBindings": Missing Pending Bindings
"RecyclerView": RecyclerView Problems
"Registered": Class is not registered in the manifest
"RelativeOverlap": Overlapping items in RelativeLayout
"RequiredSize": Missing layout_width or layout_height attributes
"AaptCrash": Potential AAPT crash
"ResourceCycle": Cycle in resource definitions
"ResourceName": Resource with Wrong Prefix
"ValidRestrictions": Invalid Restrictions Descriptor
"RtlCompat": Right-to-left text compatibility issues
"RtlEnabled": Using RTL attributes without enabling RTL support
"RtlSymmetry": Padding and margin symmetry
"RtlHardcoded": Using left/right instead of start/end attributes
"ScrollViewSize": ScrollView size validation
"SdCardPath": Hardcoded reference to /sdcard
"SecureRandom": Using a fixed seed with SecureRandom
"TrulyRandom": Weak RNG
"ExportedContentProvider": Content provider does not require permission
"ExportedReceiver": Receiver does not require permission
"ExportedService": Exported service does not require permission
"SetWorldReadable": File.setReadable() used to make file world-readable
"SetWorldWritable": File.setWritable() used to make file world-writable
"GrantAllUris": Content provider shares everything
"WorldReadableFiles": openFileOutput() or similar call passing
MODE_WORLD_READABLE
"WorldWriteableFiles": openFileOutput() or similar call passing
MODE_WORLD_WRITEABLE
"ServiceCast": Wrong system service casts
"WifiManagerLeak": WifiManager Leak
"WifiManagerPotentialLeak": WifiManager Potential Leak
"SetJavaScriptEnabled": Using setJavaScriptEnabled
"SignatureOrSystemPermissions": signatureOrSystem permissions declared
"SQLiteString": Using STRING instead of TEXT
"SSLCertificateSocketFactoryCreateSocket": Insecure call to
SSLCertificateSocketFactory.createSocket()
"SSLCertificateSocketFactoryGetInsecure": Call to
SSLCertificateSocketFactory.getInsecure()
"StateListReachable": Unreachable state in a
"AuthLeak": Code might contain an auth leak
"StringFormatCount": Formatting argument types incomplete or inconsistent
"StringFormatMatches": "String.format string doesn't match the XML format
string"
"StringFormatInvalid": Invalid format string
"PluralsCandidate": Potential Plurals
"UseCheckPermission": Using the result of check permission calls
"CheckResult": Ignoring results
"ResourceAsColor": Should pass resolved color instead of resource id
"MissingPermission": Missing Permissions
"Range": Outside Range
"ResourceType": Wrong Resource Type
"RestrictedApi": Restricted API
"WrongThread": Wrong Thread
"WrongConstant": Incorrect constant
"VisibleForTests": Visible Only For Tests
"ProtectedPermissions": Using system app permission
"TextFields": Missing inputType or hint
"TextViewEdits": TextView should probably be an EditText instead
"SelectableText": Dynamic text should probably be selectable
"MenuTitle": Missing menu title
"ShowToast": Toast created but not shown
"TooDeepLayout": Layout hierarchy is too deep
"TooManyViews": Layout has too many views
"ExtraTranslation": Extra translation
"MissingTranslation": Incomplete translation
"Typos": Spelling error
"TypographyDashes": Hyphen can be replaced with dash
"TypographyEllipsis": Ellipsis string can be replaced with ellipsis character
"TypographyFractions": Fraction string can be replaced with fraction
character
"TypographyOther": Other typographical problems
"TypographyQuotes": Straight quotes can be replaced with curvy quotes
"UnsafeProtectedBroadcastReceiver": Unsafe Protected BroadcastReceiver
"UnprotectedSMSBroadcastReceiver": Unprotected SMS BroadcastReceiver
"UnusedResources": Unused resources
"UnusedIds": Unused id
"UseCompoundDrawables": Node can be replaced by a TextView with compound
drawables
"UselessLeaf": Useless leaf layout
"UselessParent": Useless parent layout
"EnforceUTF8": Encoding used in resource files is not UTF-8
"VectorRaster": Vector Image Generation
"VectorDrawableCompat": Using VectorDrawableCompat
"VectorPath": Long vector paths
"InvalidVectorPath": Invalid vector paths
"ViewConstructor": Missing View constructors for XML inflation
"ViewHolder": View Holder Candidates
"ViewTag": Tagged object leaks
"WrongViewCast": Mismatched view type
"FindViewByIdCast": Add Explicit Cast
"Wakelock": Incorrect WakeLock usage
"WakelockTimeout": Using wakeLock without timeout
"InvalidWearFeatureAttribute": Invalid attribute for Wear uses-feature
"WearStandaloneAppFlag": Invalid or missing Wear standalone app flag
"WebViewLayout": WebViews in wrap_content parents
"WrongCall": Using wrong draw/layout method
"WrongCase": Wrong case for view tag
"InvalidId": Invalid ID declaration
"NotSibling": RelativeLayout Invalid Constraints
"UnknownId": Reference to an unknown id
"UnknownIdInLayout": Reference to an id that is not in the current layout
"SuspiciousImport": import android.R statement
"WrongFolder": Resource file in the wrong res folder
"WrongThreadInterprocedural": Wrong Thread (Interprocedural)
总结
还有遇到一些简单代码规范的问题，平时注意，就能规避，比如常见的宽高，写成了sp、xp；总之就是sp、xp、dp使用混乱等一些规范问题，或者是内存泄漏风险.