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How to use size() in android CopyOnWriteArraySet?
<p> Before getting into an example, we should know what CopyOnWriteArraySet is. It is a thread-safe variant of ArrayList and operations add, set, and so on by making a fresh copy of the underlying array.</p><p>This example demonstrates about How to use size() in android CopyOnWriteArraySet</p><p><strong>Step 1</strong> − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.</p><p><strong>Step 2</strong> − Add the following code to res/layout/activity_main.xml.</p><pre class="prettyprint notranslate"><?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:gravity = "center" android:layout_height = "match_parent" tools:context = ".MainActivity" android:orientation = "vertical"> <TextView android:id = "@+id/actionEvent" android:textSize = "40sp" android:layout_marginTop = "30dp" android:layout_width = "wrap_content" android:layout_height = "match_parent" /> </LinearLayout></pre><p>In the above code, we have taken a text view to show CopyOnWriteArraySet elements.</p><p><strong>Step 3</strong> − Add the following code to src/MainActivity.java</p><pre class="prettyprint notranslate">package com.example.myapplication; import android.os.Build; import android.os.Bundle; import android.support.annotation.RequiresApi; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.TextView; import java.util.concurrent.CopyOnWriteArraySet; public class MainActivity extends AppCompatActivity { CopyOnWriteArraySet copyOnWriteArraySet; String head; @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP) @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); copyOnWriteArraySet = new CopyOnWriteArraySet<String>(); final TextView actionEvent = findViewById(R.id.actionEvent); copyOnWriteArraySet.add("sai"); copyOnWriteArraySet.add("ram"); copyOnWriteArraySet.add("krishna"); copyOnWriteArraySet.add("prasad"); copyOnWriteArraySet.add("ram"); actionEvent.setText("" + copyOnWriteArraySet); actionEvent.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { actionEvent.setText(""+copyOnWriteArraySet.size()); } }); } }</pre><p>Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from an android studio, open one of your project's activity files and click Run <img src="https://www.tutorialspoint.com/assets/questions/media/21666/play.jpg" class="fr-fic fr-dii" width="14" height="14"> icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen –</p><p><img src="https://www.tutorialspoint.com/assets/questions/media/21666/size_copyonwritearrayset.jpg" class="fr-fic fr-dib" style="width:278px; height:556px; border:1px solid black;" width="278" height="556"></p><p>Now click on text view, it will show result as shown below –</p><p><img src="https://www.tutorialspoint.com/assets/questions/media/21666/size_copyonwritearrayset2.jpg" class="fr-fic fr-dib" style="width:278px; height:556px; border:1px solid black;" width="278" height="556"></p><p>Click <a href="/android/projects/how_to_use_size_in_android_copyonwritearrayset/MyApplication.zip">here</a> to download the project code</p>
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