Load something from Internet using URLConnection and BufferedReader, in AsyncTask

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The Title : Load something from Internet using URLConnection and BufferedReader, in AsyncTask
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Load something from Internet using URLConnection and BufferedReader, in AsyncTask

Here is example to load something from Internet using URLConnection and BufferedReader, in AsyncTask.

MainActivity.java
package com.blogspot.android_er.androidinternet;

import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

import org.w3c.dom.Text;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class MainActivity extends AppCompatActivity {

TextView textResult;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textResult = (TextView)findViewById(R.id.tresult);

MyAsyncTask myAsyncTask = new MyAsyncTask(textResult);
myAsyncTask.execute("http://android-er.blogspot.com");
}

class MyAsyncTask extends AsyncTask<String, Void, String> {

TextView textviewResult;

public MyAsyncTask(TextView textviewResult) {
super();
this.textviewResult = textviewResult;
}

@Override
protected String doInBackground(String... params) {
String result = "";

try {
URL url = new URL(params[0]);
URLConnection urlConnection = url.openConnection();
InputStream inputStream = urlConnection.getInputStream();
InputStreamReader inputStreamReader =
new InputStreamReader(inputStream);
BufferedReader buffReader = new BufferedReader(inputStreamReader);

String line;
while ((line = buffReader.readLine()) != null) {
result += line;
}

} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

return result;
}

@Override
protected void onPostExecute(String s) {
textviewResult.setText(s);

Toast.makeText(MainActivity.this,
"DONE", Toast.LENGTH_LONG).show();
super.onPostExecute(s);
}
}
}


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"
android:orientation="vertical"
android:padding="16dp"
tools:context="com.blogspot.android_er.androidinternet.MainActivity">

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:autoLink="web"
android:text="http://android-er.blogspot.com/"
android:textStyle="bold" />

<ScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:id="@+id/tresult"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</ScrollView>
</LinearLayout>


uses-permission of "android.permission.INTERNET" is needed in src/main/AndroidManifest.xml.


Add uses-permission of "android.permission.INTERNET" to AndroidManifest.xml

To access Internet in your app, you have to add uses-permission of "android.permission.INTERNET" to AndroidManifest.xml. Shown in this video:


<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.blogspot.android_er.androidinternet">

<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
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>

Related:
Load something from Internet using URLConnection and BufferedReader, in Thread



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