Android之FLAG_ACTIVITY_SINGLE_TOP
2016-06-30 10:12
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FLAG_ACTIVITY_SINGLE_TOP :如果当前栈顶的activity就是要启动的activity,则不会再启动一个新的activity
实例:
我们有一个apk,apk中包含两个Activity:MainActivity和ActivityA,点击MainActivity启动ActivityA,点击ActivityA还是启动ActivityA,但我们设置FLAG_ACTIVITY_SINGLE_TOP标记:
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public void onClick(View v) {
// TODO Auto-generated method stub
Log.i(TAG, "--onClick--task id = " + getCurrentTaskId());
Intent intent = new Intent("com.leaves.ipanel.ActivityA");
//intent.setFlags( Intent.FLAG_ACTIVITY_NEW_TASK);
intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
startActivity(intent);
}
启动动ActivityA,随便我们怎么再点击,都只有一个ActivityA实例,堆栈:
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ACTIVITY MANAGER ACTIVITIES (dumpsys activity activities)
Main stack:
TaskRecord{438f1ed8 #9 A com.leaves.ipanel U 0}
Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.leaves.ipanel/.MainActivity }
Hist #2: ActivityRecord{4265b1b0 u0 com.leaves.ipanel/.ActivityA}
Intent { act=com.leaves.ipanel.ActivityA flg=0x20000000 cmp=com.leaves.ipanel/.ActivityA }
ProcessRecord{4292a550 2115:com.leaves.ipanel/u0a10061}
Hist #1: ActivityRecord{42485758 u0 com.leaves.ipanel/.MainActivity}
Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.leaves.ipanel/.MainActivity }
ProcessRecord{4292a550 2115:com.leaves.ipanel/u0a10061}
TaskRecord{426f4820 #2 A com.android.launcher U 0}
Intent { act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x10600000 cmp=com.android.launcher/com.android.launcher2.Launcher }
Hist #0: ActivityRecord{4291c7b0 u0 com.android.launcher/com.android.launcher2.Launcher}
Intent { act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x10000000 cmp=com.android.launcher/com.android.launcher2.Launcher }
ProcessRecord{4267f0b8 636:com.android.launcher/1000}
实例:
我们有一个apk,apk中包含两个Activity:MainActivity和ActivityA,点击MainActivity启动ActivityA,点击ActivityA还是启动ActivityA,但我们设置FLAG_ACTIVITY_SINGLE_TOP标记:
[java] view plain copy
print?
public void onClick(View v) {
// TODO Auto-generated method stub
Log.i(TAG, "--onClick--task id = " + getCurrentTaskId());
Intent intent = new Intent("com.leaves.ipanel.ActivityA");
//intent.setFlags( Intent.FLAG_ACTIVITY_NEW_TASK);
intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
startActivity(intent);
}
启动动ActivityA,随便我们怎么再点击,都只有一个ActivityA实例,堆栈:
[plain] view plain copy
print?
ACTIVITY MANAGER ACTIVITIES (dumpsys activity activities)
Main stack:
TaskRecord{438f1ed8 #9 A com.leaves.ipanel U 0}
Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.leaves.ipanel/.MainActivity }
Hist #2: ActivityRecord{4265b1b0 u0 com.leaves.ipanel/.ActivityA}
Intent { act=com.leaves.ipanel.ActivityA flg=0x20000000 cmp=com.leaves.ipanel/.ActivityA }
ProcessRecord{4292a550 2115:com.leaves.ipanel/u0a10061}
Hist #1: ActivityRecord{42485758 u0 com.leaves.ipanel/.MainActivity}
Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.leaves.ipanel/.MainActivity }
ProcessRecord{4292a550 2115:com.leaves.ipanel/u0a10061}
TaskRecord{426f4820 #2 A com.android.launcher U 0}
Intent { act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x10600000 cmp=com.android.launcher/com.android.launcher2.Launcher }
Hist #0: ActivityRecord{4291c7b0 u0 com.android.launcher/com.android.launcher2.Launcher}
Intent { act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x10000000 cmp=com.android.launcher/com.android.launcher2.Launcher }
ProcessRecord{4267f0b8 636:com.android.launcher/1000}
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