A组提供了一个定制的Actvity给客户组的研发调用，调用定制后的Activity的startActivity后，抛出以下异常：
2020-04-08 16:36:18.820 12184-12488...
startClient exception:
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:916)
at android.content.ContextWrapper.startActivity(ContextWrapper.java:406)
at selfDefineActivity.startActivity(CounterfeitActivity.java:80)
...
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:764)
系统报错位置
//ContextImpl.java
@Override
public void startActivity(Intent intent, Bundle options) {
warnIfCallingFromSystemProcess();
// Calling start activity from outside an activity without FLAG_ACTIVITY_NEW_TASK is
// generally not allowed, except if the caller specifies the task id the activity should
// be launched in. A bug was existed between N and O-MR1 which allowed this to work. We
// maintain this for backwards compatibility.
final int targetSdkVersion = getApplicationInfo().targetSdkVersion;
if ((intent.getFlags() & Intent.FLAG_ACTIVITY_NEW_TASK) == 0
&& (targetSdkVersion < Build.VERSION_CODES.N
|| targetSdkVersion >= Build.VERSION_CODES.P)
&& (options == null
|| ActivityOptions.fromBundle(options).getLaunchTaskId() == -1)) {
throw new AndroidRuntimeException(
"Calling startActivity() from outside of an Activity "
+ " context requires the FLAG_ACTIVITY_NEW_TASK flag."
+ " Is this really what you want?");
}
mMainThread.getInstrumentation().execStartActivity(
getOuterContext(), mMainThread.getApplicationThread(), null,
(Activity) null, intent, -1, options);
}
如上所说义，如果你通过Context调用StartActivity，则最总会调用ContextImpl的startActivity方法，并在方法内部进行检查，只有StartActivity没有设置FLAG_ACTIVITY_NEW_TAS，且系统版本是7,8，并且options 为空或者启动的taskid为-1是，才会触发抛出异常
我们遇到的问题是因为我们自定义的selfDefineActivity，重新了startActivity方法，在覆写的startActivity中通过context启动了另外一个Activity，且启动的时候Intent没有设置对应的FLAG_ACTIVITY_NEW_TAS，options，且系统版本为Android 8
解决方法：
Intent设置FLAG_ACTIVITY_NEW_TAS，或者传一个options对象即可
