Is It Ok to Start New Activity on Back Pressed

Add a Back Button to Action Bar Android Studio (Kotlin)

      DESCRIPTION

In this tutorial we will add a back button in action bar, when it is clicked it will go to previous activity(the app will close if this was launcher activity). We will go from main activity to new activity by clicking button in main activity. In new activity we will add a back button to actionbar when that button is clicked the main activity will appear...

      VIDEO

      SOURCE CODE

Step 1: Create a new Project oropen new project

Step 2: Create New Activity File>New>Activity>EmptyActivity

Step 3: Code:

activity_main.xml

                  <?xml version="1.0" encoding="utf-8"?>                  <LinearLayout                  xmlns:android=                  "http://schemas.android.com/apk/res/android"                  xmlns:app=                  "http://schemas.android.com/apk/res-auto"                  xmlns:tools=                  "http://schemas.android.com/tools"                  android:layout_width=                  "match_parent"                  android:layout_height=                  "match_parent"                  android:gravity=                  "center"                  tools:context=                  ".MainActivity"                  >                  <Button                  android:id=                  "@+id/startActBtn"                  android:text=                  "New Activity"                  android:layout_width=                  "wrap_content"                  android:layout_height=                  "wrap_content"                  />                  </LinearLayout>                

MainActivity.kt

                  package                  com.blogspot.devofandroid.myapplication                  import android.content.Intent import android.support.v7.app.AppCompatActivity import android.os.Bundle import android.widget.Button                  class                  MainActivity                  : AppCompatActivity() {                  override                  fun                  onCreate(savedInstanceState: Bundle?) {         super.onCreate(savedInstanceState)         setContentView(R.layout.activity_main)                  //button                  val                  mStartActBtn = findViewById<Button>(R.id.startActBtn)                  //handle button click                  mStartActBtn.setOnClickListener {                  //start activity intent                  startActivity(Intent(this@MainActivity, NewActivity::class.java))         }      }  }                

activity_new.xml

                  <?xml version="1.0" encoding="utf-8"?>                  <LinearLayout                  xmlns:android=                  "http://schemas.android.com/apk/res/android"                  xmlns:app=                  "http://schemas.android.com/apk/res-auto"                  xmlns:tools=                  "http://schemas.android.com/tools"                  android:layout_width=                  "match_parent"                  android:layout_height=                  "match_parent"                  android:orientation=                  "vertical"                  android:gravity=                  "center"                  tools:context=                  ".NewActivity"                  >                  <TextView                  android:text=                  "Click back buttoon of actionbar"                  android:layout_width=                  "wrap_content"                  android:layout_height=                  "wrap_content"                  />                  </LinearLayout>                

NewActivity.kt

                  package                  com.blogspot.devofandroid.myapplication                  import android.support.v7.app.AppCompatActivity import android.os.Bundle                  class                  NewActivity                  : AppCompatActivity() {                  override                  fun                  onCreate(savedInstanceState: Bundle?) {         super.onCreate(savedInstanceState)         setContentView(R.layout.activity_new)                  //actionbar                  val                  actionbar = supportActionBar                  //set actionbar title                  actionbar!!.title =                  "New Activity"                  //set back button                  actionbar.setDisplayHomeAsUpEnabled(true)         actionbar.setDisplayHomeAsUpEnabled(true)     }                  override                  fun                  onSupportNavigateUp(): Boolean {         onBackPressed()                  return                  true                  } }                

Step 4: Run Project

Output

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Is It Ok to Start New Activity on Back Pressed

Source: https://devofandroid.blogspot.com/2018/03/add-back-button-to-action-bar-android.html

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