android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity context...

参考博客：https://blog.csdn.net/u010665691/article/details/43372517

问题描述：

通过外部Activity的上下文调用startActivity()，需要添加FLAG_ACTIVITY_NEW_TASK标志。

因为 Activity 与 Context 中都有一个 startActivity() 的方法，而 Activity 是 Context 的子类，在 Activity 中会重载 startActivity() 方法，所以两个方法存在区别。使用 Activity 中的方法没有任何的限制，但是如果使用的是 Context 中的方法，则需要添加一个标志 FLAG_ACTIVITY_NEW_TASK 来开启一个新的任务，否则就会遇到上述的问题。

引入位置：

mContext.startActivity(new Intent(MainActivity.this, OtherActivity.class));

解决方法：

1、方法一：添加 FLAG_ACTIVITY_NEW_TASK

Intent intent = new Intent(MainActivity.this, RcActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
mContext.startActivity(intent);

2、方法二、在Activity中直接使用startActivity()方法

Intent intent = new Intent(MainActivity.this, RcActivity.class);
startActivity(intent);

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