How to swap two whole activity when button is clicked and when application start again then display that swapping changes

Question

Basically,I have two activity

1. FirstActivity.java and

2. SecondActivity.java .

In this SecondActivity.java I have one Button that works as swapping between this two activity.So, when I press that Button at that time SecondActivity.java activity swapped with FirstActivity.java and when I close my application and restart again my application display that swapped operation means SecondActivity.java activity swapped successfully with the FirstActivity.java .

So,Guys If anyone know how can I do this then give me some idea to Implement this kind of functionality.

Answer 1

You need to properly terminate your application.

@Override
public void onBackPressed() {

        AlertDialog.Builder al=new AlertDialog.Builder(this);
        al.setTitle(R.string.app_name);
        al.setMessage(R.string.wanna_exit);
        al.setIcon(R.drawable.back);
        al.setCancelable(false);
        al.setPositiveButton(R.string.yea,new DialogInterface.OnClickListener(){public void onClick(DialogInterface id, int s){
            moveTaskToBack(true);
            getIntent().removeExtra("isInit");  // remove if you're using any extra
            android.os.Process.killProcess(android.os.Process.myPid());
            finish();
            System.exit(1);
        }});
        al.setNegativeButton(R.string.nope,new DialogInterface.OnClickListener(){public void onClick(DialogInterface id, int s){id.cancel();}});
        al.create().show();
 }

Use finish() when you want to move from one activity to another.

@Override
public void onBackPressed() {
     Intent intent=new Intent(getApplicationContext(),FirstActivity.class);
     startActivity(intent);
     finish();
}

Answer 2

In your SecondActivity add following lines in onCreate() :

SharedPreference pref = getSharedPreferences("yourPref", MODE_PRIVATE);
String activityName = pref.getString("activityName",null);

if(activityName != null && activityName.equals("FirstActivity")){
 startActivity(new Intent(this,FirstActivity.class));
 finish();
}

In clicklistner of button of SecondActivity.java class add following lines:

 SharedPreference pref = getSharedPreferences("yourPref", MODE_PRIVATE);
 SharedPreferences.Editor editor = pref.edit();
 editor.putString("activityName", "FirstActivity");
 editor.commit();

In clicklistener of button of FirstActivity.java class add following lines :

 SharedPreference pref = getSharedPreferences("yourPref", MODE_PRIVATE);
 SharedPreferences.Editor editor = pref.edit();
 editor.putString("activityName", "SecondActivity");
 editor.commit();

Answer 3

Lets make some order here. "switching" activities is a very confusing expression to say. I would suggest you that when the user click the button at one of those activities you will save a number in Intent .

For example:

0 - open the first activity.

1 - open the second activity.

I'm guessing your app is launching from the first activity.

When the application first run, retrieve this number from the Inent . If its a 0 do nothing. If its a 1 - use: startActivity(new Intent(FirstActivity.this, SecondActivity.class)) to start the 2nd activity and right after, use finish() to close FirstActivity