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I know single instance can be achived by setting android:launchMode="singleInstance" in menifest file. but i want to do it on run time . I think it can be achived by setting FLAG but not sure witch one.. plzz help me.. thanks in advance.
In general you can use a combination of
Intent.FLAG_ACTIVITY_SINGLE_TOP,Intent.FLAG_ACTIVITY_CLEAR_TOP,Intent.FLAG_ACTIVITY_REORDER_TO_FRONTandIntent.FLAG_ACTIVITY_NEW_TASKto accomplish what you want. However, which one (or ones) to use depends on the situation you have.