java.lang.RuntimeException: Unable to resume activity

06-26 18:32:42.600 28813 28813 E AndroidRuntime: at android.app.ActivityThread.performResumeActivity(ActivityThread.java:4290)
13706-26 18:32:42.600 28813 28813 E AndroidRuntime: at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:4330)
13806-26 18:32:42.600 28813 28813 E AndroidRuntime: at android.app.servertransaction.ResumeActivityItem.execute(ResumeActivityItem.java:51)

出现这种错误，一般是在onResume（）/ onActivityResult() 方法出现错误

情况一

public void onResume() {
    super.onResume();
    mBackgroundSound.execute(null);
}

当页面恢复 时，可能mBackgroundSound 被回收，状态空指针

情况二

如在onActivityResult()方法里，处理结果时异常。

java.lang.RuntimeException: Failure delivering result ResultInfo