Start New Activity and Finish Current One in Android

Start new Activity and finish current one in Android?

You can use finish() method or you can use:

android:noHistory="true"

And then there is no need to call finish() anymore.

<activity android:name=".ClassName" android:noHistory="true" ... />

How to finish current activity and launch a new activity Rx way?

Actually you are calling it in a wrong order. You should call startActivity() first before calling finish(). Still, encapsulating this process inside an Observable might introduce an unexpected behavior, because startActivity() is supposed to be called on UI thread as it triggers UI animation/transition to another Activity.

What you want to do is to call both startActivity() and finish() inside onNext() or onComplete() callback. But in case you REALLY need to encapsulate it, you can follow these simple steps:

1. Create a method which handles Activity switching

private fun launchNewActivity() {
    startActivity(Intent())
    finish()
}

2. Encapsulate this method in Observable

Observable.fromCallable(this::launchNewActivity)

You will want to put above Observable inside a CompositeDisposable or a DisposableObserver.

How to finish Activity when starting other activity in Android?

You need to intent your current context to another activity first with startActivity. After that you can finish your current activity from where you redirect.

 Intent intent = new Intent(this, FirstActivity.class);// New activity
 intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
 startActivity(intent);
 finish(); // Call once you redirect to another activity

intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP) - Clears the activity stack. If you don't want to clear the activity stack. PLease don't use that flag then.

Finish Current Activity and start a new one

try this code for start browser and clear all the stacks of your application

Intent intent  = new Intent(); // need to set your Intent View here
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);        
getActivity().startActivity(intent);
getActivity().finish();

Updated

Try this attribute in your activity in AndroidManifiest.xml file

<activity android:name=".MainActivity"
        android:excludeFromRecents="true" ...

How to start new activity from current activity?

It's better to do not leave a toast message with a finished activity. It may cause some problems like Screen Overlay Detected error. So, do this:

In MainActivity:

val intent = Intent(this, Main2Activity::class.java)
intent.putExtra("SHOW_WELCOME", true)
startActivity(intent)
finish()

In Main2Activity:

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    if (intent.getBooleanExtra("SHOW_WELCOME", false)) {
        Toast.makeText(this, getString(R.string.welcome), Toast.LENGTH_LONG).show()
    }
}

Android finish Activity and start another one

Use

Intent intent = new Intent(SyncActivity.this, MainActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);

Finish old activity and start a new one or vice versa

When you do startActivity(), all that does is post your intent in a queue of events. The actual starting of the activity happens asynchronously in the near future. So I don't see a big difference between the two.

Call new activity and destroy current one

Intent i = new Intent(MainActivity.this,SecondActivity.class);
startActivity(i);
finish();

Finish current activity and start another one after share intent

I solved it by starting the the new activity then finishing the current activity then starting twitter app and share my tweet:

Intent i = new Intent(context,SecondActivity.class);
        startActivity(i);
        getActivity().finish();

        getActivity().getPackageManager().getPackageInfo("com.twitter.android", 0);
        Intent intent = new Intent(Intent.ACTION_SEND);
        intent.setClassName("com.twitter.android", "com.twitter.android.composer.ComposerActivity");
        intent.setType("text/plain");
        intent.putExtra(Intent.EXTRA_TEXT, url);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
        startActivityForResult(intent,0);

How to finish current activity in Android

If you are doing a loading screen, just set the parameter to not keep it in activity stack. In your manifest.xml, where you define your activity do:

<activity android:name=".LoadingScreen" android:noHistory="true" ... />

And in your code there is no need to call .finish() anymore. Just do startActivity(i);

There is also no need to keep a instance of your current activity in a separate field. You can always access it like LoadingScreen.this.doSomething() instead of private LoadingScreen loadingScreen;

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