android 清空之前task中的activity

huohu00 2016-09-29

开发过程有个场景:关闭之前所有activity,跳转到登录页

以前是activity都放到一个list里面,退出应用的时候遍历列表,逐个finish

换种实现方式

跳转登录页的intent添加两个flag 
Intent.FLAG_ACTIVITY_CLEAR_TASK
Intent.FLAG_ACTIVITY_NEW_TASK
Intent intent = new Intent(this, TestCActivity.class);
		intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
		intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
		startActivity(intent);
当然如果登录页的launchMode为singleTask的话,就不需要
Intent.FLAG_ACTIVITY_NEW_TASK

(要么在manifest文件中声明,要么在intent中添加flag,二者择一即可)

看下google文档

* If set in an Intent passed to {@link Context#startActivity Context.startActivity()},
     * this flag will cause any existing task that would be associated with the
     * activity to be cleared before the activity is started.  That is, the activity
     * becomes the new root of an otherwise empty task, and any old activities
     * are finished.  This can only be used in conjunction with {@link #FLAG_ACTIVITY_NEW_TASK}.

cet-4的基本能看懂吧~

备注apilevel要大于11

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