还有用asp做网站的吗,网站开发蓝云,荥阳做公司网站的公司,网页ui设计培训taskAffinity 和 FLAG_ACTIVITY_NEW_TASK都是和activity启动时是否需要新建一个task有关#xff0c;我们分四种情况看一下这两个标志对启动activity的影响#xff1a;(前提#xff1a;从MainActivity中启动ActivityA)
1)、两个标志都不设置 2)、有FLAG_ACTIVITY_NEW_TASK …taskAffinity 和 FLAG_ACTIVITY_NEW_TASK都是和activity启动时是否需要新建一个task有关我们分四种情况看一下这两个标志对启动activity的影响(前提从MainActivity中启动ActivityA)
1)、两个标志都不设置 2)、有FLAG_ACTIVITY_NEW_TASK 3)、无FLAG_ACTIVITY_NEW_TASK有taskAffinity (不同于MainActivity) 4)、有FLAG_ACTIVITY_NEW_TASK有taskAffinity
注意上面的标志都是针对于启动的ActivityAFLAG_ACTIVITY_NEW_TASK 是在启动ActivityA的Intent中设置的taskAffinity 是在AndroidManifest中ActivityA中设置另外注意这里两个actiity的启动模式都设置为standard
1、先看第一中情况
主要代码 activity android:name.ActivityA android:launchModestandard android:labelstring/title_activityA intent-filter action android:namecom.leaves.ipanel.ActivityA/ category android:nameandroid.intent.category.DEFAULT/ /intent-filter /activity MainActivity启动activitypublic void onClick(View arg0) { // TODO Auto-generated method stub Log.i(TAG, --onClick--task id getCurrentTaskId()); Intent intent new Intent(com.leaves.ipanel.ActivityA); startActivity(intent); } 启动A之后的堆栈ACTIVITY MANAGER ACTIVITIES (dumpsys activity activities) Main stack: TaskRecord{415ebce8 #37 A com.leaves.ipanel U 0} Intent { actandroid.intent.action.MAIN cat[android.intent.category.LAUNCHER] flg0x10000000 cmpcom.leaves.ipanel/.MainActivity } Hist #2: ActivityRecord{42358368 u0 com.leaves.ipanel/.ActivityA} Intent { actcom.leaves.ipanel.ActivityA cmpcom.leaves.ipanel/.ActivityA } ProcessRecord{42384ad8 7591:com.leaves.ipanel/u0a10061} Hist #1: ActivityRecord{4132a3d0 u0 com.leaves.ipanel/.MainActivity} Intent { actandroid.intent.action.MAIN cat[android.intent.category.LAUNCHER] flg0x10000000 cmpcom.leaves.ipanel/.MainActivity } ProcessRecord{42384ad8 7591:com.leaves.ipanel/u0a10061} TaskRecord{41350f60 #2 A com.android.launcher U 0} Intent { actandroid.intent.action.MAIN cat[android.intent.category.HOME] flg0x10000000 cmpcom.android.launcher/com.android.launcher2.Launcher } Hist #0: ActivityRecord{41616790 u0 com.android.launcher/com.android.launcher2.Launcher} Intent { actandroid.intent.action.MAIN cat[android.intent.category.HOME] flg0x10000000 cmpcom.android.launcher/com.android.launcher2.Launcher } ProcessRecord{41615818 628:com.android.launcher/1000} 可见跟启动他的activity同属于一个task.
2、有FLAG_ACTIVITY_NEW_TASK
我们添加FLAG_ACTIVITY_NEW_TASK public void onClick(View arg0) { // TODO Auto-generated method stub Log.i(TAG, --onClick--task id getCurrentTaskId()); Intent intent new Intent(com.leaves.ipanel.ActivityA); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); startActivity(intent); } 启动A之后的堆栈ACTIVITY MANAGER ACTIVITIES (dumpsys activity activities) Main stack: TaskRecord{415ebce8 #37 A com.leaves.ipanel U 0} Intent { actandroid.intent.action.MAIN cat[android.intent.category.LAUNCHER] flg0x10000000 cmpcom.leaves.ipanel/.MainActivity } Hist #2: ActivityRecord{42358368 u0 com.leaves.ipanel/.ActivityA} Intent { actcom.leaves.ipanel.ActivityA cmpcom.leaves.ipanel/.ActivityA } ProcessRecord{42384ad8 7591:com.leaves.ipanel/u0a10061} Hist #1: ActivityRecord{4132a3d0 u0 com.leaves.ipanel/.MainActivity} Intent { actandroid.intent.action.MAIN cat[android.intent.category.LAUNCHER] flg0x10000000 cmpcom.leaves.ipanel/.MainActivity } ProcessRecord{42384ad8 7591:com.leaves.ipanel/u0a10061} TaskRecord{41350f60 #2 A com.android.launcher U 0} Intent { actandroid.intent.action.MAIN cat[android.intent.category.HOME] flg0x10000000 cmpcom.android.launcher/com.android.launcher2.Launcher } Hist #0: ActivityRecord{41616790 u0 com.android.launcher/com.android.launcher2.Launcher} Intent { actandroid.intent.action.MAIN cat[android.intent.category.HOME] flg0x10000000 cmpcom.android.launcher/com.android.launcher2.Launcher } ProcessRecord{41615818 628:com.android.launcher/1000} 可见跟启动他的activity还是同属于一个task.
3、无FLAG_ACTIVITY_NEW_TASK有taskAffinity (不同于MainActivity) public void onClick(View arg0) { // TODO Auto-generated method stub Log.i(TAG, --onClick--task id getCurrentTaskId()); Intent intent new Intent(com.leaves.ipanel.ActivityA); startActivity(intent); } activity android:name.ActivityA android:launchModestandard android:taskAffinitycom.leaves.test.ActivityA android:labelstring/title_activityA intent-filter action android:namecom.leaves.ipanel.ActivityA/ category android:nameandroid.intent.category.DEFAULT/ /intent-filter /activity 查看一下启动A之后的堆栈ACTIVITY MANAGER ACTIVITIES (dumpsys activity activities) Main stack: TaskRecord{415ebce8 #37 A com.leaves.ipanel U 0} Intent { actandroid.intent.action.MAIN cat[android.intent.category.LAUNCHER] flg0x10000000 cmpcom.leaves.ipanel/.MainActivity } Hist #2: ActivityRecord{42358368 u0 com.leaves.ipanel/.ActivityA} Intent { actcom.leaves.ipanel.ActivityA cmpcom.leaves.ipanel/.ActivityA } ProcessRecord{42384ad8 7591:com.leaves.ipanel/u0a10061} Hist #1: ActivityRecord{4132a3d0 u0 com.leaves.ipanel/.MainActivity} Intent { actandroid.intent.action.MAIN cat[android.intent.category.LAUNCHER] flg0x10000000 cmpcom.leaves.ipanel/.MainActivity } ProcessRecord{42384ad8 7591:com.leaves.ipanel/u0a10061} TaskRecord{41350f60 #2 A com.android.launcher U 0} Intent { actandroid.intent.action.MAIN cat[android.intent.category.HOME] flg0x10000000 cmpcom.android.launcher/com.android.launcher2.Launcher } Hist #0: ActivityRecord{41616790 u0 com.android.launcher/com.android.launcher2.Launcher} Intent { actandroid.intent.action.MAIN cat[android.intent.category.HOME] flg0x10000000 cmpcom.android.launcher/com.android.launcher2.Launcher } ProcessRecord{41615818 628:com.android.launcher/1000} 跟前面两种情况是一样的。
4、有FLAG_ACTIVITY_NEW_TASK有taskAffinity
把FLAG_ACTIVITY_NEW_TASK添加上去 public void onClick(View arg0) { // TODO Auto-generated method stub Log.i(TAG, --onClick--task id getCurrentTaskId()); Intent intent new Intent(com.leaves.ipanel.ActivityA); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); startActivity(intent); } 查看一下启动A之后的堆栈 ACTIVITY MANAGER ACTIVITIES (dumpsys activity activities) Main stack: TaskRecord{4140d4c8 #42 A com.leaves.test.ActivityA U 0} Intent { actcom.leaves.ipanel.ActivityA flg0x10000000 cmpcom.leaves.ipanel/.ActivityA } Hist #2: ActivityRecord{416b48d8 u0 com.leaves.ipanel/.ActivityA} Intent { actcom.leaves.ipanel.ActivityA flg0x10000000 cmpcom.leaves.ipanel/.ActivityA } ProcessRecord{41393ed0 8028:com.leaves.ipanel/u0a10061} TaskRecord{4231cf40 #41 A com.leaves.ipanel U 0} Intent { actandroid.intent.action.MAIN cat[android.intent.category.LAUNCHER] flg0x10000000 cmpcom.leaves.ipanel/.MainActivity } Hist #1: ActivityRecord{413c8430 u0 com.leaves.ipanel/.MainActivity} Intent { actandroid.intent.action.MAIN cat[android.intent.category.LAUNCHER] flg0x10000000 cmpcom.leaves.ipanel/.MainActivity } ProcessRecord{41393ed0 8028:com.leaves.ipanel/u0a10061} TaskRecord{41350f60 #2 A com.android.launcher U 0} Intent { actandroid.intent.action.MAIN cat[android.intent.category.HOME] flg0x10000000 cmpcom.android.launcher/com.android.launcher2.Launcher } Hist #0: ActivityRecord{41616790 u0 com.android.launcher/com.android.launcher2.Launcher} Intent { actandroid.intent.action.MAIN cat[android.intent.category.HOME] flg0x10000000 cmpcom.android.launcher/com.android.launcher2.Launcher } ProcessRecord{41615818 628:com.android.launcher/1000} 可以看到这次终于在一个新的task中启动了ActivityA.上面我们测试的两个Activity是在同一个应用中如果他们在不同的应用中呢例如ActivityA跟MainActivity不在一个apk中其实情况还是一样的只是这个时候如果没有在AndroidManifest.xml中设置taskAffinity则他们两个的taskAffinity是不一样的。因为默认如果没有设置taskAffinity则taskAffinity跟包名是一样的所以如果ActivityA跟MainActivity不在一个apk中当没有FLAG_ACTIVITY_NEW_TASK时则两者应该是在同一个task但是如果有FLAG_ACTIVITY_NEW_TASK则两者应该会在不同的task中。 总结
如果没有设置FLAG_ACTIVITY_NEW_TASK且是从一个activity中启动另一个activity,即sourceRecord不为null,则设置新启动的TaskRecord为即sourceRecord的TaskRecord 如果设置了FLAG_ACTIVITY_NEW_TASK则根据task的 affinity、intent、ComponentName等查找是否有合适的TaskRecord
这些工作的解析还是在ActivityStack.Java的startActivityUncheckedLocked函数中进行的。
