Back to previous activity in android

Back to previous activity in android

              This is the sample coding for back to the previous activity .Sometimes we have to go to one activity from many activity's . that time we dont know which activity we have to go when press back button. This example will help you to do that.

Steps:

1)Add the current activity to the shared preference when start the activity.

SharedPreferences prefs = getSharedPreferences("X", MODE_PRIVATE); Editor editor = prefs.edit(); editor.putString("lastActivity", context.getClass().getName()); editor.commit(); Intent i=new Intent(getApplicationContext(),Activity3.class); startActivity(i); finish();

2)get the previous running activity from shared preference and start the previous activity.

Class<?> activityClass; try { SharedPreferences prefs = getSharedPreferences("X", MODE_PRIVATE); activityClass = Class.forName( prefs.getString("lastActivity", Activity3.class.getName())); } catch(ClassNotFoundException ex) { activityClass = Activity3.class; } startActivity(new Intent(this, activityClass)); finish();

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