Load something from Internet using URLConnection and ReadableByteChannel, in Thread

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Last example show "Load something from Internet using URLConnection and BufferedReader, in Thread". Here is another example using java.nio.channels.ReadableByteChannel.

Read operations are synchronous on a ReadableByteChannel, that is, if a read is already in progress on the channel then subsequent reads will block until the first read completes. It is undefined whether non-read operations will block.


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

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

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;

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);

MyThread myThread = new MyThread("http://android-er.blogspot.com", textResult);
myThread.start();
}

class MyThread extends Thread{
String target;
TextView textviewResult;

private Handler handler = new Handler();

public MyThread(String target, TextView textviewResult) {
super();
this.target = target;
this.textviewResult = textviewResult;
}

@Override
public void run() {
String result = "";

URL url = null;
try {
url = new URL(target);
URLConnection urlConnection = url.openConnection();
InputStream inputStream = urlConnection.getInputStream();

ReadableByteChannel readableByteChannel = Channels.newChannel(inputStream);
ByteBuffer buffer = ByteBuffer.allocate(1024);

while (readableByteChannel.read(buffer) > 0)
{
result += new String(buffer.array());
buffer.clear();
}

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


final String finalResult = result;
handler.post(new Runnable() {
@Override
public void run() {
textviewResult.setText(finalResult);
Toast.makeText(MainActivity.this,
"finished", Toast.LENGTH_LONG).show();
}
});
}
}
}


For layout and AndroidManifest.xml, refer to the previous post "Load something from Internet using URLConnection and BufferedReader, in AsyncTask".


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