Andorid之taskAffinity 和 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ActivityA，FLAG_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：
2、有FLAG_ACTIVITY_NEW_TASK
我们添加FLAG_ACTIVITY_NEW_TASK
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public void onClick(View arg0) {
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// TODO Auto-generated method stub
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Log.i(TAG, "--onClick--task id = " + getCurrentTaskId());
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Intent intent = new Intent("com.leaves.ipanel.ActivityA");
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intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
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startActivity(intent);
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}
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ACTIVITY MANAGER ACTIVITIES (dumpsys activity activities)
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Main stack:
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TaskRecord{415ebce8 #37 A com.leaves.ipanel U 0}
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Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.leaves.ipanel/.MainActivity }
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Hist #2: ActivityRecord{42358368 u0 com.leaves.ipanel/.ActivityA}
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Intent { act=com.leaves.ipanel.ActivityA cmp=com.leaves.ipanel/.ActivityA }
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ProcessRecord{42384ad8 7591:com.leaves.ipanel/u0a10061}
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Hist #1: ActivityRecord{4132a3d0 u0 com.leaves.ipanel/.MainActivity}
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Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.leaves.ipanel/.MainActivity }
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ProcessRecord{42384ad8 7591:com.leaves.ipanel/u0a10061}
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TaskRecord{41350f60 #2 A com.android.launcher U 0}
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Intent { act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x10000000 cmp=com.android.launcher/com.android.launcher2.Launcher }
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Hist #0: ActivityRecord{41616790 u0 com.android.launcher/com.android.launcher2.Launcher}
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Intent { act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x10000000 cmp=com.android.launcher/com.android.launcher2.Launcher }
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ProcessRecord{41615818 628:com.android.launcher/1000}
3、无FLAG_ACTIVITY_NEW_TASK有taskAffinity (不同于MainActivity)
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<activity android:name=".ActivityA"
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android:launchMode="standard"
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android:taskAffinity="com.leaves.test.ActivityA"
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android:label="@string/title_activityA">
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<intent-filter>
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<action android:name="com.leaves.ipanel.ActivityA"/>
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<category android:name="android.intent.category.DEFAULT"/>
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</intent-filter>
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</activity>
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ACTIVITY MANAGER ACTIVITIES (dumpsys activity activities)
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Main stack:
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TaskRecord{415ebce8 #37 A com.leaves.ipanel U 0}
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Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.leaves.ipanel/.MainActivity }
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Hist #2: ActivityRecord{42358368 u0 com.leaves.ipanel/.ActivityA}
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Intent { act=com.leaves.ipanel.ActivityA cmp=com.leaves.ipanel/.ActivityA }
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ProcessRecord{42384ad8 7591:com.leaves.ipanel/u0a10061}
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Hist #1: ActivityRecord{4132a3d0 u0 com.leaves.ipanel/.MainActivity}
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Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.leaves.ipanel/.MainActivity }
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ProcessRecord{42384ad8 7591:com.leaves.ipanel/u0a10061}
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TaskRecord{41350f60 #2 A com.android.launcher U 0}
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Intent { act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x10000000 cmp=com.android.launcher/com.android.launcher2.Launcher }
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Hist #0: ActivityRecord{41616790 u0 com.android.launcher/com.android.launcher2.Launcher}
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Intent { act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x10000000 cmp=com.android.launcher/com.android.launcher2.Launcher }
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ProcessRecord{41615818 628:com.android.launcher/1000}
4、有FLAG_ACTIVITY_NEW_TASK有taskAffinity
把FLAG_ACTIVITY_NEW_TASK添加上去
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
文章来源: chenyu.blog.csdn.net，作者：chen.yu，版权归原作者所有，如需转载，请联系作者。
原文链接：chenyu.blog.csdn.net/article/details/51786266
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