How can I encode a URL in Android ?

•    Add the following code to res/layout/activity_main.xml.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
   android:padding="4dp"
   tools:context=".MainActivity">
   <WebView
      android:id="@+id/webView"
      android:layout_width="match_parent"
      android:layout_height="match_parent"/>
   <Button
      android:id="@+id/btnEncode"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Load URL"
      android:layout_alignParentBottom="true"
      android:layout_alignParentEnd="true" />
</RelativeLayout>

•     Add the following code to src/MainActivity.java

import androidx.appcompat.app.AppCompatActivity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.Toast;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
public class MainActivity extends AppCompatActivity {
   Button button;
   private WebView webView;
   String strURL;
   private String query;
   public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      webView = findViewById(R.id.webView);
      button = findViewById(R.id.btnEncode);
      strURL = "http://stackoverflow.com/search?q=";
      try {
         query = URLEncoder.encode("android drawables", "UTF-8");
      }
       catch (UnsupportedEncodingException e) {
         e.printStackTrace();
      }
      strURL += query;
      button.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            webView.setWebViewClient(new WebViewClient() {
               @Override
               public void onPageStarted(WebView view, String url, Bitmap favicon) {
               }
               @Override
               public void onPageFinished(WebView view, String url) {
                  Toast.makeText(getApplicationContext(), "Page Loaded.", Toast.LENGTH_SHORT).show();
               }
            });
            webView.getSettings().setJavaScriptEnabled(true);
            webView.loadUrl(strURL);
         }
      });
   }
}

•     Add the following code to androidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.sample">
   <uses-permission android:name="android.permission.INTERNET" />
   <application
      android:allowBackup="true"
      android:icon="@mipmap/ic_launcher"
      android:label="@string/app_name"
      android:roundIcon="@mipmap/ic_launcher_round"
      android:supportsRtl="true"
      android:theme="@style/AppTheme">
         <activity android:name=".MainActivity">
            <intent-filter>
               <action android:name="android.intent.action.MAIN" />
               <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
         </activity>
   </application>
</manifest>

OutPut