Android~记录material.tabs.TabLayout一个bug

在使用TabLayout过程中发现一个奇葩的bug，说我xml布局文件有问题。

1、完整log

2019-12-30 16:50:41.426 9068-9068/? E/ActivityThread: Failed to find provider info for com.mirrorlink.android.provider
2019-12-30 16:50:41.586 10184-10184/? E/AndroidRuntime: FATAL EXCEPTION: mainjava.lang.RuntimeException: Unable to start activity ComponentInfo{com.ut.smartcook/com.ut.smartcook.MainActivity}:  android.view.InflateException: Binary XML file line  #24: Binary XML file line  #24: Error inflating class com.google.android.material.tabs.TabLayoutat android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3021)at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3156)at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1864)at android.os.Handler.dispatchMessage(Handler.java:106)at android.os.Looper.loop(Looper.java:205)at android.app.ActivityThread.main(ActivityThread.java:6991)at java.lang.reflect.Method.invoke(Native Method)at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:884)Caused by: android.view.InflateException: Binary XML file line   #24: Binary XML file line #24: Error inflating class com.google.android.material.tabs.TabLayoutCaused by: android.view.InflateException: Binary XML file line   #24: Error inflating class com.google.android.material.tabs.TabLayoutCaused by: java.lang.reflect.InvocationTargetExceptionat java.lang.reflect.Constructor.newInstance0(Native Method)at java.lang.reflect.Constructor.newInstance(Constructor.java:343)at android.view.LayoutInflater.createView(LayoutInflater.java:647)at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:790)at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)at android.view.LayoutInflater.rInflate(LayoutInflater.java:863)at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)at android.view.LayoutInflater.rInflate(LayoutInflater.java:866)at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)at android.view.LayoutInflater.inflate(LayoutInflater.java:515)at android.view.LayoutInflater.inflate(LayoutInflater.java:423)at android.view.LayoutInflater.inflate(LayoutInflater.java:374)at com.android.internal.policy.PhoneWindow.setContentView(PhoneWindow.java:435)at android.app.Activity.setContentView(Activity.java:2777)at com.ut.smartcook.MainActivity.onCreate(MainActivity.java:34)at android.app.Activity.performCreate(Activity.java:7159)at android.app.Activity.performCreate(Activity.java:7150)at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1272)at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3001)at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3156)at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1864)at android.os.Handler.dispatchMessage(Handler.java:106)at android.os.Looper.loop(Looper.java:205)at android.app.ActivityThread.main(ActivityThread.java:6991)at java.lang.reflect.Method.invoke(Native Method)at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:884)Caused by: java.lang.NullPointerException: Attempt to invoke virtual method   'int android.content.res.ColorStateList.getDefaultColor()' on a null object referenceat com.google.android.material.tabs.TabLayout.<init>(TabLayout.java:548)at com.google.android.material.tabs.TabLayout.<init>(TabLayout.java:461)at java.lang.reflect.Constructor.newInstance0(Native Method) at java.lang.reflect.Constructor.newInstance(Constructor.java:343) at android.view.LayoutInflater.createView(LayoutInflater.java:647) at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:790) at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730) at android.view.LayoutInflater.rInflate(LayoutInflater.java:863) at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824) at android.view.LayoutInflater.rInflate(LayoutInflater.java:866) at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824) at android.view.LayoutInflater.inflate(LayoutInflater.java:515) at android.view.LayoutInflater.inflate(LayoutInflater.java:423) at android.view.LayoutInflater.inflate(LayoutInflater.java:374) at com.android.internal.policy.PhoneWindow.setContentView(PhoneWindow.java:435) at android.app.Activity.setContentView(Activity.java:2777) at com.ut.smartcook.MainActivity.onCreate(MainActivity.java:34) at android.app.Activity.performCreate(Activity.java:7159) at android.app.Activity.performCreate(Activity.java:7150) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1272) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3001) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3156) at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1864) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loop(Looper.java:205) at android.app.ActivityThread.main(ActivityThread.java:6991) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:884)

2、关键log

Caused by: android.view.InflateException: Binary XML file line #24: Binary XML file line
#24: Error inflating class com.google.android.material.tabs.TabLayout
Caused by: android.view.InflateException: Binary XML file line
#24: Error inflating class com.google.android.material.tabs.TabLayout

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method
'int android.content.res.ColorStateList.getDefaultColor()' on a null object referenceat com.google.android.material.tabs.TabLayout.<init>(TabLayout.java:548)

大概意思是说Tablayout初始化时，tabTextColors = createColorStateList(tabTextColors.getDefaultColor(), selected);
tabTextColors为空。

3、解决办法

app:tabTextColor="#81858B"
app:tabSelectedTextColor="#31353B"

将tabTextColor放在tabSelectedTextColor之前声明即可，如果没在配置好tabTextColor之后配置tabSelectedTextColor会报错！

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Android~记录material.tabs.TabLayout一个bug

1、完整log

2、关键log

3、解决办法

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