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How to binarySearch in android listview?
This example demonstrates How to binarySearch in android listview.
Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.
Step 2 − Add the following code to res/layout/activity_main.xml.
<?xml version = "1.0" encoding = "utf-8"?> <LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" xmlns:tools = "http://schemas.android.com/tools" android:layout_width = "match_parent" android:layout_height = "match_parent" tools:context = ".MainActivity" android:orientation = "vertical"> <EditText android:id = "@+id/name" android:layout_width = "match_parent" android:hint = "Enter Name" android:layout_height = "wrap_content" /> <LinearLayout android:layout_width = "wrap_content" android:layout_height = "wrap_content"> <Button android:id = "@+id/save" android:text = "Save" android:layout_width = "wrap_content" android:layout_height = "wrap_content" /> <Button android:id = "@+id/refresh" android:text = "Refresh" android:layout_width = "wrap_content" android:layout_height = "wrap_content" /> </LinearLayout> <ListView android:id = "@+id/listView" android:layout_width = "match_parent" android:layout_height = "wrap_content"> </ListView> </LinearLayout>
In the above code, we have taken name and record number as Edit text, when user click on save button it will store the data into arraylist. Click on refresh button to get the changes of listview.
Step 3 − Add the following code to src/MainActivity.java
package com.example.andy.myapplication; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.ArrayAdapter; import android.widget.EditText; import android.widget.ListView; import android.widget.Toast; import java.util.ArrayList; import java.util.Collections; import java.util.HashSet; import java.util.Set; public class MainActivity extends AppCompatActivity { EditText name; ArrayAdapter arrayAdapter; ArrayList<String> array_list; Set set = new HashSet(); private ListView listView; @Override protected void onCreate(Bundle readdInstanceState) { super.onCreate(readdInstanceState); setContentView(R.layout.activity_main); array_list = new ArrayList<String>(); array_list.ensureCapacity(20); name = findViewById(R.id.name); listView = findViewById(R.id.listView); findViewById(R.id.refresh).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { arrayAdapter.notifyDataSetChanged(); listView.invalidateViews(); listView.refreshDrawableState(); } }); findViewById(R.id.save).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (!name.getText().toString().isEmpty()) { set.add(name.getText().toString()); array_list.clear(); if (array_list.isEmpty()) { array_list.addAll(set); int index; index = Collections.binarySearch(array_list, "sairam"); if (index > = 0) { Collections.fill(array_list, "sairam"); } array_list.trimToSize(); arrayAdapter = new ArrayAdapter(MainActivity.this, android.R.layout.simple_list_item_1, array_list); listView.setAdapter(arrayAdapter); } else { listView.setVisibility(View.GONE); } Toast.makeText(MainActivity.this, "Inserted", Toast.LENGTH_LONG).show(); } else { name.setError("Enter NAME"); } } }); } }
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 android studio, open one of your project's activity files and click Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen –
Now we are inserting name as sairam because we are searching string sairam using binarySearch from arraylist. It going to replace all values as sairam as shown below –
Click here to download the project code
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