E/AndroidRuntime: FATAL EXCEPTION: main    Process: com.example.debugshow, PID: 3438    java.lang.RuntimeException: Unable to start service com.example.debugshow.view.Main.FloatingService@ed88d6d with Intent { cmp=com.example.debugshow/.view.Main.FloatingService (has extras) }: android.view.InflateException: Binary XML file line #22: Binary XML file line #22: Error inflating class com.example.debugshow.view.Main.DraggableFloatingButton        at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3097)        at android.app.ActivityThread.access$2300(ActivityThread.java:156)        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1507)        at android.os.Handler.dispatchMessage(Handler.java:102)        at android.os.Looper.loop(Looper.java:157)        at android.app.ActivityThread.main(ActivityThread.java:5653)        at java.lang.reflect.Method.invoke(Native Method)        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:746)        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:636)     Caused by: android.view.InflateException: Binary XML file line #22: Binary XML file line #22: Error inflating class com.example.debugshow.view.Main.DraggableFloatingButton        at android.view.LayoutInflater.inflate(LayoutInflater.java:543)        at android.view.LayoutInflater.inflate(LayoutInflater.java:427)        at android.view.LayoutInflater.inflate(LayoutInflater.java:374)        at android.view.View.inflate(View.java:19830)        at com.example.debugshow.view.Main.FloatingDebugView.initView(FloatingDebugView.java:37)        at com.example.debugshow.view.Main.FloatingDebugView.(FloatingDebugView.java:31)        at com.example.debugshow.view.Main.FloatingDebugWindowManager.addView(FloatingDebugWindowManager.java:52)        at com.example.debugshow.view.Main.FloatingService.onStartCommand(FloatingService.java:41)        at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3077)        at android.app.ActivityThread.access$2300(ActivityThread.java:156)         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1507)         at android.os.Handler.dispatchMessage(Handler.java:102)         at android.os.Looper.loop(Looper.java:157)         at android.app.ActivityThread.main(ActivityThread.java:5653)         at java.lang.reflect.Method.invoke(Native Method)         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:746)         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:636)      Caused by: android.view.InflateException: Binary XML file line #22: Error inflating class com.example.debugshow.view.Main.DraggableFloatingButton        at android.view.LayoutInflater.createView(LayoutInflater.java:649)        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:768)        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:708)        at android.view.LayoutInflater.rInflate(LayoutInflater.java:839)        at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:802)        at android.view.LayoutInflater.rInflate(LayoutInflater.java:842)        at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:802)        at android.view.LayoutInflater.inflate(LayoutInflater.java:519)        at android.view.LayoutInflater.inflate(LayoutInflater.java:427)         at android.view.LayoutInflater.inflate(LayoutInflater.java:374)         at android.view.View.inflate(View.java:19830)         at com.example.debugshow.view.Main.FloatingDebugView.initView(FloatingDebugView.java:37)         at com.example.debugshow.view.Main.FloatingDebugView.(FloatingDebugView.java:31)         at com.example.debugshow.view.Main.FloatingDebugWindowManager.addView(FloatingDebugWindowManager.java:52)         at com.example.debugshow.view.Main.FloatingService.onStartCommand(FloatingService.java:41)         at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3077)         at android.app.ActivityThread.access$2300(ActivityThread.java:156)         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1507)         at android.os.Handler.dispatchMessage(Handler.java:102)         at android.os.Looper.loop(Looper.java:157)         at android.app.ActivityThread.main(ActivityThread.java:5653)         at java.lang.reflect.Method.invoke(Native Method)         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:746)         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:636)      Caused by: java.lang.reflect.InvocationTargetException        at java.lang.reflect.Constructor.newInstance(Native Method)        at android.view.LayoutInflater.createView(LayoutInflater.java:623)        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:768)         at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:708)         at android.view.LayoutInflater.rInflate(LayoutInflater.java:839)         at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:802)         at android.view.LayoutInflater.rInflate(LayoutInflater.java:842)         at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:802)         at android.view.LayoutInflater.inflate(LayoutInflater.java:519)         at android.view.LayoutInflater.inflate(LayoutInflater.java:427)         at android.view.LayoutInflater.inflate(LayoutInflater.java:374)         at android.view.View.inflate(View.java:19830)         at com.example.debugshow.view.Main.FloatingDebugView.initView(FloatingDebugView.java:37)         at com.example.debugshow.view.Main.FloatingDebugView.(FloatingDebugView.java:31)         at com.example.debugshow.view.Main.FloatingDebugWindowManager.addView(FloatingDebugWindowManager.java:52)         at com.example.debugshow.view.Main.FloatingService.onStartCommand(FloatingService.java:41)         at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3077)         at android.app.ActivityThread.access$2300(ActivityThread.java:156)         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1507)         at android.os.Handler.dispatchMessage(Handler.java:102)         at android.os.Looper.loop(Looper.java:157)         at android.app.ActivityThread.main(ActivityThread.java:5653)         at java.lang.reflect.Method.invoke(Native Method)         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:746)         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:636)      Caused by: java.lang.IllegalArgumentException: The style on this component requires your app theme to be Theme.AppCompat (or a descendant).        at android.support.design.internal.ThemeEnforcement.checkTheme(ThemeEnforcement.java:221)        at android.support.design.internal.ThemeEnforcement.checkAppCompatTheme(ThemeEnforcement.java:196)        at android.support.design.internal.ThemeEnforcement.checkCompatibleTheme(ThemeEnforcement.java:131)        at android.support.design.internal.ThemeEnforcement.obtainStyledAttributes(ThemeEnforcement.java:72)        at android.support.design.widget.FloatingActionButton.(FloatingActionButton.java:195)        at android.support.design.widget.FloatingActionButton.(FloatingActionButton.java:188)        at com.example.debugshow.view.Main.DraggableFloatingButton.(DraggableFloatingButton.java:24)        at java.lang.reflect.Constructor.newInstance(Native Method)         at android.view.LayoutInflater.createView(LayoutInflater.java:623)         at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:768)         at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:708)         at android.view.LayoutInflater.rInflate(LayoutInflater.java:839)         at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:802)         at android.view.LayoutInflater.rInflate(LayoutInflater.java:842)         at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:802)         at android.view.LayoutInflater.inflate(LayoutInflater.java:519)         at android.view.LayoutInflater.inflate(LayoutInflater.java:427)         at android.view.LayoutInflater.inflate(LayoutInflater.java:374)         at android.view.View.inflate(View.java:19830)         at com.example.debugshow.view.Main.FloatingDebugView.initView(FloatingDebugView.java:37)         at com.example.debugshow.view.Main.FloatingDebugView.(FloatingDebugView.java:31)         at com.example.debugshow.view.Main.FloatingDebugWindowManager.addView(FloatingDebugWindowManager.java:52)         at com.example.debugshow.view.Main.FloatingService.onStartCommand(FloatingService.java:41)         at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3077)         at android.app.ActivityThread.access$2300(ActivityThread.java:156)         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1507)         at android.os.Handler.dispatchMessage(Handler.java:102)         at android.os.Looper.loop(Looper.java:157)         at android.app.ActivityThread.main(ActivityThread.java:5653)         at java.lang.reflect.Method.invoke(Native Method)         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:746)         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:636) I/Process: Sending signal. PID: 3438 SIG: 9Disconnected from the target VM, address: 'localhost:8600', transport: 'socket'

       网上很多说法是出这个错的原因是自定义View的构造函数没写全，但是我把三个构造函数写全了，依然报这个错。其实真正的解法是，在引用这个自定义布局的界面根标签里，添加一行代码：

 android:theme="@style/Theme.AppCompat"

 

 

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