Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW

本文链接：https://blog.youkuaiyun.com/weixin_37639900/article/details/101266734

今天做了一个悬浮效果，从悬浮控件跳转Activity时报错Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?

   android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity  context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?
        at android.app.ContextImpl.startActivity(ContextImpl.java:682)
        at android.app.ContextImpl.startActivity(ContextImpl.java:669)
        at android.content.ContextWrapper.startActivity(ContextWrapper.java:341)
        at com.geotmt.collection.task.service.FloatButtonService$1.onClick(FloatButtonService.java:75)
        at android.view.View.performClick(View.java:5215)
        at android.view.View$PerformClick.run(View.java:21196)
        at android.os.Handler.handleCallback(Handler.java:742)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:157)
        at android.app.ActivityThread.main(ActivityThread.java:5597)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:771)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:649)

原因分析和解决方法

因为我是从一个服务FloatButtonService中向Activity跳转，用的是Context的startActivity方法，最终点的是用的是Context的子类ContextImpl的startActivity，那我们就从这里入手，看看ContextImpl的startActivity的逻辑
在这里插入图片描述如图错误的地方找到了，总结一下原因使用Context的startActivity方法，就需要开启一个新的的task，否则就会抛出上面的异常，注意（我们平时在activity中使用startActivity没有报错，是因为Activity重写了Context的startActivity方法，因此无任何限制）