Web scrapping in Android application

Android Apps/Applications Mobile Development

This example demonstrates how do I do web scrapping in android application.

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 – Open build.gradle(Mobule:app) and add the following dependency

implementation 'org.jsoup:jsoup:1.11.2'

Step 3 − 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"
   tools:context=".MainActivity">
   <TextView
      android:id="@+id/textView"
      android:text=""
      android:layout_width="match_parent"
      android:layout_height="600dp"
      android:padding="4dp"
      android:layout_centerHorizontal="true" />
   <Button
      android:id="@+id/btnView"
      android:text="Scrap Text from web"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerHorizontal="true"
      android:layout_marginBottom="25sp"
      android:layout_alignParentBottom="true"/>
</RelativeLayout>

Step 4 − Add the following code to src/MainActivity.java

import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import java.io.IOException;
public class MainActivity extends AppCompatActivity {
   TextView textView;
   Button button;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      textView = findViewById(R.id.textView);
      button = findViewById(R.id.btnView);
      button.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            new doIT().execute();
         }
      });
   }
   public class doIT extends AsyncTask<Void,Void,Void> {
      String words;
      @Override
      protected Void doInBackground(Void... params) {
         try {
            Document document = Jsoup.connect("https://www.tutorialspoint.com/css_online_training/index.asp").get();
            words = document.text();
         } catch (IOException e) {
            e.printStackTrace();
         } return null;
      }
      @Override
      protected void onPostExecute(Void aVoid) {
         super.onPostExecute(aVoid);
         textView.setText(words);
      }
   }
}

Step 5 - Add the following code to androidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<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>

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 –

Click here to download the project code.

Azhar

Published on 21-Aug-2019 08:53:46

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