Resume the Activity instead of Starting if already exists in back stack

android, back-stack

Solution

You can add this two lines and try

intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

Write this in your manifest file inside Activity

<activity
     android:name=".SettingsActivity"
     android:launchMode="singleInstance"
     android:screenOrientation="portrait" >
</activity>

"singleTask" and "singleInstance" activities can only begin a task. They are always at the root of the activity stack. Moreover, the device can hold only one instance of the activity at a time — only one such task.

You can use SingleTask or SingleInstance

"singleTask" - The system creates the activity at the root of a new task and routes the intent to it. However, if an instance of the activity already exists, the system routes the intent to existing instance through a call to its onNewIntent() method, rather than creating a new one.

"singleInstance" - Same as "singleTask", except that the system doesn't launch any other activities into the task holding the instance. The activity is always the single and only member of its task.

Refer this link http://developer.android.com/guide/topics/manifest/activity-element.html

Problem

I have an `Activity_1` after a lot of steps, say `Activity_2` > `Activity_3` .... in some `Activity_n` I change some data related to `Activity_1` and call it using ``` Intent intent = new Intent(Activity_n.this, Activity_1.class); intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); startActivity(intent); ``` To refresh the content. But later I can go all the way back to `Activity_1` where I started, which has old data. Instead I want the initial `Activity_1`' s `onResume()` to be called, using the above code. Or appropriate Flag FLAG_ACTIVITY_CLEAR_TOP consider a task consisting of the activities: A, B, C, D. If D calls startActivity() with an Intent that resolves to the component of activity B, then C and D will be finished and B receive the given Intent, resulting in the stack now being: A, B. That' what the docs say, but not what I am getting.

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