Navigating back to previous Activity

I have two Activities A and B.

Activity A has a Tablayout with some Tabs. When I navigate from A to B I use this:

Intent intent = new Intent(A, B.class);

A.startActivity(intent);

When I now navigate back from B to A I have a question:

1) When using Android's back button, the selected tab / scrolling position from A was remembered

2) When using an Intent or NavUtils.navigateUpFromSameTask(this); then the selected tab and scroll Position is NOT remembered but set to initial value

Can someone explain me what is going on here?

edited Jan 1 at 18:08

Fantômas

32.8k156390

asked Jan 1 at 14:26

matthias

766727

Hey @matthias, please accept an answer which worked for you!

– Gourav
Jan 1 at 14:48

Possible duplicate: stackoverflow.com/q/24487327/9819031

– Gourav
Jan 1 at 15:01

add a comment |

I have two Activities A and B.

Activity A has a Tablayout with some Tabs. When I navigate from A to B I use this:

Intent intent = new Intent(A, B.class);

A.startActivity(intent);

When I now navigate back from B to A I have a question:

1) When using Android's back button, the selected tab / scrolling position from A was remembered

2) When using an Intent or NavUtils.navigateUpFromSameTask(this); then the selected tab and scroll Position is NOT remembered but set to initial value

Can someone explain me what is going on here?

edited Jan 1 at 18:08

Fantômas

32.8k156390

asked Jan 1 at 14:26

matthias

766727

Hey @matthias, please accept an answer which worked for you!

– Gourav
Jan 1 at 14:48

Possible duplicate: stackoverflow.com/q/24487327/9819031

– Gourav
Jan 1 at 15:01

add a comment |

I have two Activities A and B.

Activity A has a Tablayout with some Tabs. When I navigate from A to B I use this:

Intent intent = new Intent(A, B.class);

A.startActivity(intent);

When I now navigate back from B to A I have a question:

1) When using Android's back button, the selected tab / scrolling position from A was remembered

2) When using an Intent or NavUtils.navigateUpFromSameTask(this); then the selected tab and scroll Position is NOT remembered but set to initial value

Can someone explain me what is going on here?

edited Jan 1 at 18:08

Fantômas

32.8k156390

asked Jan 1 at 14:26

matthias

766727

I have two Activities A and B.

Activity A has a Tablayout with some Tabs. When I navigate from A to B I use this:

Intent intent = new Intent(A, B.class);

A.startActivity(intent);

When I now navigate back from B to A I have a question:

1) When using Android's back button, the selected tab / scrolling position from A was remembered

2) When using an Intent or NavUtils.navigateUpFromSameTask(this); then the selected tab and scroll Position is NOT remembered but set to initial value

Can someone explain me what is going on here?

android

edited Jan 1 at 18:08

Fantômas

32.8k156390

asked Jan 1 at 14:26

matthias

766727

edited Jan 1 at 18:08

Fantômas

32.8k156390

asked Jan 1 at 14:26

matthias

766727

edited Jan 1 at 18:08

Fantômas

32.8k156390

edited Jan 1 at 18:08

Fantômas

32.8k156390

edited Jan 1 at 18:08

Fantômas

32.8k156390

asked Jan 1 at 14:26

matthias

766727

asked Jan 1 at 14:26

matthias

766727

asked Jan 1 at 14:26

matthias

766727

Hey @matthias, please accept an answer which worked for you!

– Gourav
Jan 1 at 14:48

Possible duplicate: stackoverflow.com/q/24487327/9819031

– Gourav
Jan 1 at 15:01

add a comment |

Hey @matthias, please accept an answer which worked for you!

– Gourav
Jan 1 at 14:48

Possible duplicate: stackoverflow.com/q/24487327/9819031

– Gourav
Jan 1 at 15:01

Hey @matthias, please accept an answer which worked for you!

– Gourav
Jan 1 at 14:48

Possible duplicate: stackoverflow.com/q/24487327/9819031

– Gourav
Jan 1 at 15:01

add a comment |

4 Answers
4

active

oldest

votes

1) when navigation from activity A to B, the android system does not destroy activity A, but takes it to the back stack and adds B to the foreground. thats why when you press the back button or call onBackPressed() from the java code activity B is destroyed and A is set to the foreground. here is an example from the docs : Understand Tasks and Back stack
Android Activity Stack

2) when using an intent/navigateUpFromSameTask activity A is recreated and set to the foreground and B is set to the background, it's like adding another activity A to the stack so it will be A,B,A but if you press the back btn then you will be back to B and then A.

if you want to keep the scroll position and other data in activity A you call the onBackPressed in B or use the onSaveInstanceState to save the data and use it in the onCreate .

here is an example of saved instance:

@Override

public void onSaveInstanceState(Bundle savedInstanceState) {

    super.onSaveInstanceState(savedInstanceState);

    savedInstanceState.putString("VariableName", variableData);

    savedInstanceState.putString("VariableName", variableData);

    savedInstanceState.putString("VariableName", variableData);

}



@Override

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.penguin_main);



    if(savedInstanceState!=null){

    bookData = (String) savedInstanceState.getSerializable("VariableName");

    bookData =  (String) savedInstanceState.getSerializable("VariableName");

    bookData =  (String) savedInstanceState.getSerializable("VariableName");

    }

}

edited Jan 1 at 14:49

answered Jan 1 at 14:45

medyas

43038

Hey @medyas, it seems you are copying my and Balaji SB's code and using it combined!

– Gourav
Jan 1 at 14:47

i did not copy you answer or anyone's. he asked for explanation why did this happened and i answered.

– medyas
Jan 1 at 14:52

But do you agree that he does need only recommendation but not want to use any one! His question is a bit unclear. He wants just explanation!

– Gourav
Jan 1 at 14:53

give him some time to ready the answers and then he will reply or choose one

– medyas
Jan 1 at 14:55

ok let him take his time!

– Gourav
Jan 1 at 14:56

add a comment |

You can set the current scroll position and tab position in activity A's on overriding onSaveInstance(Bundle savedInstanceState) method. When return to activity you can get onRestoreInstanceState(Bundle savedInstanceState) to restore it.
Hope it helps :)

edited Jan 1 at 14:50

Gourav

7391629

answered Jan 1 at 14:40

Balaji SB

216

Hey @Balaji SB, this can become memory consuming! If Android provides a way to finish the activity without saving the data, then what's the problem? Sorry to say, but I disagree with you!

– Gourav
Jan 1 at 14:44

Hi @Gourav..Actually he don't need to finish the activity. He just navigate to some other activity and return to previous activity to maintain the state.

– Balaji SB
Jan 1 at 14:49

It seems @matthias just needs recommendation what is good or what's bad! His questions is a bit unclear on what he wants to do!

– Gourav
Jan 1 at 14:51

add a comment |

Because NavUtils.navigateUpFromSameTask() just calls startActivity() and if android:launchMode="standard" the activity will be instantiated and created again and that is why can not remember the previous selected tab. To solve this issue you can override onNavigateUp() and inside that setCurrentItem(index) the index of tab you want to be displayed.

 @Override

 public boolean onNavigateUp() {



  myViewPager.setCurrentItem(position, true);

  return true;

}

Edit
You can use another solution to solve the problem by setting android:launchMode="singleTop" on activity but this solution may not applicable in all the application.

edited Jan 1 at 15:05

answered Jan 1 at 14:52

Amir

161214

but where is the position element defined?

– Gourav
Jan 1 at 14:54

position is the index of your tab. you can put the index of the tab you want to be displayed when navigating from B to A

– Amir
Jan 1 at 14:56

add a comment |

When you start an Activity, the first page will be opened! But when the back button is pressed, it navigates between the saved state of the activityTo simulate the back button pressed, you can try this:

@Override

public void onBackPressed() {

    finish();  //your choice, thought not needed as super.onBackPressed(); is called if nothing is assigned here

}

or on toolbar back button clicked click:

toolbar.setNavigationOnClickListener(new View.OnClickListener() {

    @Override

    public void onClick(View v) {

        finish();

    }

});

edited Jan 1 at 21:33

halfer

14.7k758115

answered Jan 1 at 14:34

Gourav

7391629

add a comment |

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4 Answers
4

active

oldest

votes

4 Answers
4

active

oldest

votes

if you want to keep the scroll position and other data in activity A you call the onBackPressed in B or use the onSaveInstanceState to save the data and use it in the onCreate .

here is an example of saved instance:

@Override

public void onSaveInstanceState(Bundle savedInstanceState) {

    super.onSaveInstanceState(savedInstanceState);

    savedInstanceState.putString("VariableName", variableData);

    savedInstanceState.putString("VariableName", variableData);

    savedInstanceState.putString("VariableName", variableData);

}



@Override

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.penguin_main);



    if(savedInstanceState!=null){

    bookData = (String) savedInstanceState.getSerializable("VariableName");

    bookData =  (String) savedInstanceState.getSerializable("VariableName");

    bookData =  (String) savedInstanceState.getSerializable("VariableName");

    }

}

edited Jan 1 at 14:49

answered Jan 1 at 14:45

medyas

43038

Hey @medyas, it seems you are copying my and Balaji SB's code and using it combined!

– Gourav
Jan 1 at 14:47

i did not copy you answer or anyone's. he asked for explanation why did this happened and i answered.

– medyas
Jan 1 at 14:52

But do you agree that he does need only recommendation but not want to use any one! His question is a bit unclear. He wants just explanation!

– Gourav
Jan 1 at 14:53

give him some time to ready the answers and then he will reply or choose one

– medyas
Jan 1 at 14:55

ok let him take his time!

– Gourav
Jan 1 at 14:56

add a comment |

if you want to keep the scroll position and other data in activity A you call the onBackPressed in B or use the onSaveInstanceState to save the data and use it in the onCreate .

here is an example of saved instance:

@Override

public void onSaveInstanceState(Bundle savedInstanceState) {

    super.onSaveInstanceState(savedInstanceState);

    savedInstanceState.putString("VariableName", variableData);

    savedInstanceState.putString("VariableName", variableData);

    savedInstanceState.putString("VariableName", variableData);

}



@Override

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.penguin_main);



    if(savedInstanceState!=null){

    bookData = (String) savedInstanceState.getSerializable("VariableName");

    bookData =  (String) savedInstanceState.getSerializable("VariableName");

    bookData =  (String) savedInstanceState.getSerializable("VariableName");

    }

}

edited Jan 1 at 14:49

answered Jan 1 at 14:45

medyas

43038

Hey @medyas, it seems you are copying my and Balaji SB's code and using it combined!

– Gourav
Jan 1 at 14:47

i did not copy you answer or anyone's. he asked for explanation why did this happened and i answered.

– medyas
Jan 1 at 14:52

But do you agree that he does need only recommendation but not want to use any one! His question is a bit unclear. He wants just explanation!

– Gourav
Jan 1 at 14:53

give him some time to ready the answers and then he will reply or choose one

– medyas
Jan 1 at 14:55

ok let him take his time!

– Gourav
Jan 1 at 14:56

add a comment |

if you want to keep the scroll position and other data in activity A you call the onBackPressed in B or use the onSaveInstanceState to save the data and use it in the onCreate .

here is an example of saved instance:

@Override

public void onSaveInstanceState(Bundle savedInstanceState) {

    super.onSaveInstanceState(savedInstanceState);

    savedInstanceState.putString("VariableName", variableData);

    savedInstanceState.putString("VariableName", variableData);

    savedInstanceState.putString("VariableName", variableData);

}



@Override

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.penguin_main);



    if(savedInstanceState!=null){

    bookData = (String) savedInstanceState.getSerializable("VariableName");

    bookData =  (String) savedInstanceState.getSerializable("VariableName");

    bookData =  (String) savedInstanceState.getSerializable("VariableName");

    }

}

edited Jan 1 at 14:49

answered Jan 1 at 14:45

medyas

43038

if you want to keep the scroll position and other data in activity A you call the onBackPressed in B or use the onSaveInstanceState to save the data and use it in the onCreate .

here is an example of saved instance:

@Override

public void onSaveInstanceState(Bundle savedInstanceState) {

    super.onSaveInstanceState(savedInstanceState);

    savedInstanceState.putString("VariableName", variableData);

    savedInstanceState.putString("VariableName", variableData);

    savedInstanceState.putString("VariableName", variableData);

}



@Override

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.penguin_main);



    if(savedInstanceState!=null){

    bookData = (String) savedInstanceState.getSerializable("VariableName");

    bookData =  (String) savedInstanceState.getSerializable("VariableName");

    bookData =  (String) savedInstanceState.getSerializable("VariableName");

    }

}

edited Jan 1 at 14:49

answered Jan 1 at 14:45

medyas

43038

edited Jan 1 at 14:49

answered Jan 1 at 14:45

medyas

43038

answered Jan 1 at 14:45

medyas

43038

answered Jan 1 at 14:45

medyas

43038

Hey @medyas, it seems you are copying my and Balaji SB's code and using it combined!

– Gourav
Jan 1 at 14:47

i did not copy you answer or anyone's. he asked for explanation why did this happened and i answered.

– medyas
Jan 1 at 14:52

But do you agree that he does need only recommendation but not want to use any one! His question is a bit unclear. He wants just explanation!

– Gourav
Jan 1 at 14:53

give him some time to ready the answers and then he will reply or choose one

– medyas
Jan 1 at 14:55

ok let him take his time!

– Gourav
Jan 1 at 14:56

add a comment |

Hey @medyas, it seems you are copying my and Balaji SB's code and using it combined!

– Gourav
Jan 1 at 14:47

i did not copy you answer or anyone's. he asked for explanation why did this happened and i answered.

– medyas
Jan 1 at 14:52

But do you agree that he does need only recommendation but not want to use any one! His question is a bit unclear. He wants just explanation!

– Gourav
Jan 1 at 14:53

give him some time to ready the answers and then he will reply or choose one

– medyas
Jan 1 at 14:55

ok let him take his time!

– Gourav
Jan 1 at 14:56

Hey @medyas, it seems you are copying my and Balaji SB's code and using it combined!

– Gourav
Jan 1 at 14:47

i did not copy you answer or anyone's. he asked for explanation why did this happened and i answered.

– medyas
Jan 1 at 14:52

But do you agree that he does need only recommendation but not want to use any one! His question is a bit unclear. He wants just explanation!

– Gourav
Jan 1 at 14:53

give him some time to ready the answers and then he will reply or choose one

– medyas
Jan 1 at 14:55

ok let him take his time!

– Gourav
Jan 1 at 14:56

add a comment |

edited Jan 1 at 14:50

Gourav

7391629

answered Jan 1 at 14:40

Balaji SB

216

Hey @Balaji SB, this can become memory consuming! If Android provides a way to finish the activity without saving the data, then what's the problem? Sorry to say, but I disagree with you!

– Gourav
Jan 1 at 14:44

Hi @Gourav..Actually he don't need to finish the activity. He just navigate to some other activity and return to previous activity to maintain the state.

– Balaji SB
Jan 1 at 14:49

It seems @matthias just needs recommendation what is good or what's bad! His questions is a bit unclear on what he wants to do!

– Gourav
Jan 1 at 14:51

add a comment |

edited Jan 1 at 14:50

Gourav

7391629

answered Jan 1 at 14:40

Balaji SB

216

Hey @Balaji SB, this can become memory consuming! If Android provides a way to finish the activity without saving the data, then what's the problem? Sorry to say, but I disagree with you!

– Gourav
Jan 1 at 14:44

Hi @Gourav..Actually he don't need to finish the activity. He just navigate to some other activity and return to previous activity to maintain the state.

– Balaji SB
Jan 1 at 14:49

It seems @matthias just needs recommendation what is good or what's bad! His questions is a bit unclear on what he wants to do!

– Gourav
Jan 1 at 14:51

add a comment |

edited Jan 1 at 14:50

Gourav

7391629

answered Jan 1 at 14:40

Balaji SB

216

edited Jan 1 at 14:50

Gourav

7391629

answered Jan 1 at 14:40

Balaji SB

216

edited Jan 1 at 14:50

Gourav

7391629

edited Jan 1 at 14:50

Gourav

7391629

edited Jan 1 at 14:50

Gourav

7391629

answered Jan 1 at 14:40

Balaji SB

216

answered Jan 1 at 14:40

Balaji SB

216

answered Jan 1 at 14:40

Balaji SB

216

Hey @Balaji SB, this can become memory consuming! If Android provides a way to finish the activity without saving the data, then what's the problem? Sorry to say, but I disagree with you!

– Gourav
Jan 1 at 14:44

Hi @Gourav..Actually he don't need to finish the activity. He just navigate to some other activity and return to previous activity to maintain the state.

– Balaji SB
Jan 1 at 14:49

It seems @matthias just needs recommendation what is good or what's bad! His questions is a bit unclear on what he wants to do!

– Gourav
Jan 1 at 14:51

add a comment |

Hey @Balaji SB, this can become memory consuming! If Android provides a way to finish the activity without saving the data, then what's the problem? Sorry to say, but I disagree with you!

– Gourav
Jan 1 at 14:44

Hi @Gourav..Actually he don't need to finish the activity. He just navigate to some other activity and return to previous activity to maintain the state.

– Balaji SB
Jan 1 at 14:49

It seems @matthias just needs recommendation what is good or what's bad! His questions is a bit unclear on what he wants to do!

– Gourav
Jan 1 at 14:51

Hey @Balaji SB, this can become memory consuming! If Android provides a way to finish the activity without saving the data, then what's the problem? Sorry to say, but I disagree with you!

– Gourav
Jan 1 at 14:44

Hi @Gourav..Actually he don't need to finish the activity. He just navigate to some other activity and return to previous activity to maintain the state.

– Balaji SB
Jan 1 at 14:49

It seems @matthias just needs recommendation what is good or what's bad! His questions is a bit unclear on what he wants to do!

– Gourav
Jan 1 at 14:51

add a comment |

 @Override

 public boolean onNavigateUp() {



  myViewPager.setCurrentItem(position, true);

  return true;

}

Edit
You can use another solution to solve the problem by setting android:launchMode="singleTop" on activity but this solution may not applicable in all the application.

edited Jan 1 at 15:05

answered Jan 1 at 14:52

Amir

161214

but where is the position element defined?

– Gourav
Jan 1 at 14:54

position is the index of your tab. you can put the index of the tab you want to be displayed when navigating from B to A

– Amir
Jan 1 at 14:56

add a comment |

 @Override

 public boolean onNavigateUp() {



  myViewPager.setCurrentItem(position, true);

  return true;

}

Edit
You can use another solution to solve the problem by setting android:launchMode="singleTop" on activity but this solution may not applicable in all the application.

edited Jan 1 at 15:05

answered Jan 1 at 14:52

Amir

161214

but where is the position element defined?

– Gourav
Jan 1 at 14:54

position is the index of your tab. you can put the index of the tab you want to be displayed when navigating from B to A

– Amir
Jan 1 at 14:56

add a comment |

 @Override

 public boolean onNavigateUp() {



  myViewPager.setCurrentItem(position, true);

  return true;

}

Edit
You can use another solution to solve the problem by setting android:launchMode="singleTop" on activity but this solution may not applicable in all the application.

edited Jan 1 at 15:05

answered Jan 1 at 14:52

Amir

161214

 @Override

 public boolean onNavigateUp() {



  myViewPager.setCurrentItem(position, true);

  return true;

}

Edit
You can use another solution to solve the problem by setting android:launchMode="singleTop" on activity but this solution may not applicable in all the application.

edited Jan 1 at 15:05

answered Jan 1 at 14:52

Amir

161214

edited Jan 1 at 15:05

answered Jan 1 at 14:52

Amir

161214

answered Jan 1 at 14:52

Amir

161214

answered Jan 1 at 14:52

Amir

161214

but where is the position element defined?

– Gourav
Jan 1 at 14:54

position is the index of your tab. you can put the index of the tab you want to be displayed when navigating from B to A

– Amir
Jan 1 at 14:56

add a comment |

but where is the position element defined?

– Gourav
Jan 1 at 14:54

position is the index of your tab. you can put the index of the tab you want to be displayed when navigating from B to A

– Amir
Jan 1 at 14:56

but where is the position element defined?

– Gourav
Jan 1 at 14:54

position is the index of your tab. you can put the index of the tab you want to be displayed when navigating from B to A

– Amir
Jan 1 at 14:56

add a comment |

@Override

public void onBackPressed() {

    finish();  //your choice, thought not needed as super.onBackPressed(); is called if nothing is assigned here

}

or on toolbar back button clicked click:

toolbar.setNavigationOnClickListener(new View.OnClickListener() {

    @Override

    public void onClick(View v) {

        finish();

    }

});

edited Jan 1 at 21:33

halfer

14.7k758115

answered Jan 1 at 14:34

Gourav

7391629

add a comment |

@Override

public void onBackPressed() {

    finish();  //your choice, thought not needed as super.onBackPressed(); is called if nothing is assigned here

}

or on toolbar back button clicked click:

toolbar.setNavigationOnClickListener(new View.OnClickListener() {

    @Override

    public void onClick(View v) {

        finish();

    }

});

edited Jan 1 at 21:33

halfer

14.7k758115

answered Jan 1 at 14:34

Gourav

7391629

add a comment |

@Override

public void onBackPressed() {

    finish();  //your choice, thought not needed as super.onBackPressed(); is called if nothing is assigned here

}

or on toolbar back button clicked click:

toolbar.setNavigationOnClickListener(new View.OnClickListener() {

    @Override

    public void onClick(View v) {

        finish();

    }

});

edited Jan 1 at 21:33

halfer

14.7k758115

answered Jan 1 at 14:34

Gourav

7391629

@Override

public void onBackPressed() {

    finish();  //your choice, thought not needed as super.onBackPressed(); is called if nothing is assigned here

}

or on toolbar back button clicked click:

toolbar.setNavigationOnClickListener(new View.OnClickListener() {

    @Override

    public void onClick(View v) {

        finish();

    }

});

edited Jan 1 at 21:33

halfer

14.7k758115

answered Jan 1 at 14:34

Gourav

7391629

edited Jan 1 at 21:33

halfer

14.7k758115

edited Jan 1 at 21:33

halfer

14.7k758115

edited Jan 1 at 21:33

halfer

14.7k758115

answered Jan 1 at 14:34

Gourav

7391629

answered Jan 1 at 14:34

Gourav

7391629

answered Jan 1 at 14:34

Gourav

7391629

add a comment |

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