Android: Go back to previous activity

问题:

I want to do something simple on android app. How is it possible to go back to a previous activity.

What code do I need to go back to previous activity

回答1:

Android activities are stored in the activity stack. Going back to a previous activity could mean two things.

1. You opened the new activity from another activity with startActivityForResult. In that case you can just call the finishActivity() function from your code and it'll take you back to the previous activity.

2. Keep track of the activity stack. Whenever you start a new activity with an intent you can specify an intent flag like FLAG_ACTIVITY_REORDER_TO_FRONT or FLAG_ACTIVITY_PREVIOUS_IS_TOP. You can use this to shuffle between the activities in your application. Haven't used them much though. Have a look at the flags here: http://developer.android.com/reference/android/content/Intent.html

As mentioned in the comments, if the activity is opened with startActivity() then one can close it with finish(). If you wish to use the Up button you can catch that in onOptionsSelected(MenuItem item) method with checking the item ID against android.R.id.home unlike R.id.home as mentioned in the comments.

回答2:

Try Activity#finish(). This is more or less what the back button does by default.

回答3:

Just write on click finish(). It will take you to the previous Activity.

回答4:

Just this

super.onBackPressed(); 

回答5:

intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 

This will get you to a previous activity keeping its stack and clearing all activities after it from the stack.

For example, if stack was A->B->C->D and you start B with this flag, stack will be A->B

回答6:

Are you wanting to take control of the back button behavior? You can override the back button (to go to a specific activity) via one of two methods.

For Android 1.6 and below:

@Override public boolean onKeyDown(int keyCode, KeyEvent event)  {     if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {         // do something on back.         return true;     }      return super.onKeyDown(keyCode, event); } 

Or if you are only supporting Android 2.0 or greater:

@Override public void onBackPressed() {     // do something on back.     return; } 

For more details: http://android-developers.blogspot.com/2009/12/back-and-other-hard-keys-three-stories.html

回答7:

Just call these method to finish current activity or to go back by onBackPressed

finish(); 

OR

onBackPressed(); 

回答8:

if you want to go to just want to go to previous activity use

finish(); 

OR

onBackPressed(); 

if you want to go to second activity or below that use following:

intent = new Intent(MyFourthActivity.this , MySecondActivity.class); intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); //Bundle is optional Bundle bundle = new Bundle(); bundle.putString("MyValue1", val1); intent.putExtras(bundle); //end Bundle startActivity(intent); 

回答9:

If you have setup correctly the AndroidManifest.xml file with activity parent, you can use :

NavUtils.navigateUpFromSameTask(this); 

Where this is your child activity.

回答10:

You can explicitly call onBackPressed is the easiest way
Refer Go back to previous activity for details

回答11:

Start the second activity using intent (either use startActivity or startActivityForResult according to your requirements). Now when user press back button, the current activity on top will be closed and the previous will be shown.

Now Lets say you have two activities, one for selecting some settings for the user, like language, country etc, and after selecting it, the user clicks on Next button to go to the login form (for example) . Now if the login is unsuccessful, then the user will be on the login activity, what if login is successful ?

If login is successful, then you have to start another activity. It means a third activity will be started, and still there are two activities running. In this case, it will be good to use startActivityForResult. When login is successful, send OK data back to first activity and close login activity. Now when the data is received, then start the third activity and close the first activity by using finish.

回答12:

Add this in your onCLick() method, it will go back to your previous activity

finish();

or You can use this. It worked perfectly for me

 @Override   public boolean onOptionsItemSelected(MenuItem item) {   int id = item.getItemId();        if ( id == android.R.id.home ) {          finish();          return true;        }    return super.onOptionsItemSelected(item);   } 

回答13:

You can try this:

@Override public boolean onKeyDown(int keyCode, KeyEvent event) {     if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {          finish();         return true;     }     return super.onKeyDown(keyCode, event); } 

回答14:

@Override public void onBackPressed() {     super.onBackPressed(); } 

and if you want on button click go back then simply put

bbsubmit.setOnClickListener(new View.OnClickListener() {     @Override     public void onClick(View v) {         onBackPressed();     } }); 

回答15:

Try this is act as you have to press back button

finish(); onBackPressed(); 

回答16:

All new activities/intents by default have back/previous behavior, unless you have coded a finish() on the calling activity.

回答17:

Got the same problem and

finish();  OR super.onBackPressed(); 

worked fine for me, both worked same, but no luck with return

回答18:

I suggest the NavUtils.navigateUpFromSameTask(), it's easy and very simple, you can learn it from the google developer.Wish I could help you!

回答19:

Besides all the mentioned answers, their is still an alternative way of doing this, lets say you have two classes , class A and class B.

Class A you have made some activities like checkbox select, printed out some data and intent to class B. Class B, you would like to pass multiple values to class A and maintain the previous state of class A, you can use, try this alternative method or download source code to demonstrate this

http://whats-online.info/science-and-tutorials/125/Android-maintain-the-previous-state-of-activity-on-intent/

or

http://developer.android.com/reference/android/content/Intent.html

回答20:

 @Override  public boolean onOptionsItemSelected(MenuItem item) {       int id = item.getItemId();        if ( id == android.R.id.home ) {           finish();           return true;       }        return super.onOptionsItemSelected(item);  } 

Try this it works both on toolbar back button as hardware back button.

回答21:

Just try this in, first activity

Intent mainIntent = new Intent(Activity1.this, Activity2.class); this.startActivity(mainIntent); 

In your second activity

@Override public void onBackPressed() {     this.finish(); } 

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