栈内由下到上: MainActivity -> TestAActivity.
2. SingleTop
栈顶复用模式. 只有Activity位于栈顶, 重复启动时, 会使用默认实例, 即单例模式; 如果位于栈内, 则仍然会创建实例.
MainActivity启动TestA, TestA启动TestB, TestB启动自身, TestB是单例. 观察栈内情况, TestB只有一份实例, 第二次创建复用.
Stack #1:
Running activities (most recent first):
TaskRecord{12abf566 #2712 A=me.chunyu.spike.wcl_activity_launchmode_demo U=0 sz=3}
Run #2: ActivityRecord{187d7ff7 u0 me.chunyu.spike.wcl_activity_launchmode_demo/.TestBActivity t2712}
Run #1: ActivityRecord{a551034 u0 me.chunyu.spike.wcl_activity_launchmode_demo/.TestAActivity t2712}
Run #0: ActivityRecord{22f9cce4 u0 me.chunyu.spike.wcl_activity_launchmode_demo/.MainActivity t2712}
栈内: MainActivity -> TestAActivity -> TestBActivity
MainActivity启动TestA, TestA启动TestB, TestB启动TestC, TestC启动TestB, TestB是单例. 观察栈内情况, 由于TestC是栈顶, TestC启动TestB, TestB不是栈顶, 重新创建TestB实例, 则保留两份TestB.
Stack #1:
Running activities (most recent first):
TaskRecord{1792f5f0 #2715 A=me.chunyu.spike.wcl_activity_launchmode_demo U=0 sz=5}
Run #4: ActivityRecord{1e70110b u0 me.chunyu.spike.wcl_activity_launchmode_demo/.TestBActivity t2715}
Run #3: ActivityRecord{c7f4dce u0 me.chunyu.spike.wcl_activity_launchmode_demo/.TestCActivity t2715}
Run #2: ActivityRecord{254536cd u0 me.chunyu.spike.wcl_activity_launchmode_demo/.TestBActivity t2715}
Run #1: ActivityRecord{36b2da15 u0 me.chunyu.spike.wcl_activity_launchmode_demo/.TestAActivity t2715}
Run #0: ActivityRecord{3a1c4a6a u0 me.chunyu.spike.wcl_activity_launchmode_demo/.MainActivity t2715}
栈内: MainActivity -> TestAActivity -> TestBActivity ->TestCActivity -> TestBActivity
