اینم یه مثال:
به AndroidManifest.xml دسترسی رو به اینترنت اضافه کن: (اگر برای اندروید 6 میخواید باید در run-time دسترسی رو هم چک کنی)
<uses-permission android:name="android.permission.INTERNET"/>
کد layout رو بذار:
<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" >
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/urlBox"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="42dp"
android:enabled="true"
android:hint="Enter Address"
android:layout_toLeftOf="@+id/button"
android:layout_toStartOf="@+id/button" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Submit"
android:id="@+id/button"
android:layout_alignBottom="@+id/urlBox"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Content"
android:id="@+id/resultBox"
android:layout_below="@+id/button"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentBottom="true"
android:layout_alignRight="@+id/button"
android:layout_alignEnd="@+id/button" />
</RelativeLayout>
و کد جاوای متناظر با این layout:
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Scanner;
public class MainActivity extends Activity {
private Button submit;
private EditText urlBox;
private TextView resultBox;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
submit=(Button) findViewById(R.id.button);
urlBox=(EditText) findViewById(R.id.urlBox);
resultBox=(TextView) findViewById(R.id.resultBox);
submit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
new Browser().execute(urlBox.getText().toString());
Toast.makeText(getApplicationContext(),"Fetching from "+urlBox.getText().toString(),Toast.LENGTH_SHO RT);
}
});
}
class Browser extends AsyncTask<String, Void,String>{
@Override
protected String doInBackground(String... strings) {
if(strings==null || strings.length<1){
return "";
}
HttpURLConnection connection = null;
StringBuilder stringBuilder=new StringBuilder("");
try {
URL url=new URL(strings[0]);
connection = (HttpURLConnection) url.openConnection();
connection.connect();
//Response
if(connection.getResponseCode()==HttpURLConnection .HTTP_OK){
Scanner cin=new Scanner(connection.getInputStream());
while (cin.hasNextLine()){
stringBuilder.append(cin.nextLine());
}
}
} catch (MalformedURLException e) {
Toast.makeText(getApplicationContext(),"Address is not valid ",Toast.LENGTH_LONG);
} catch (IOException e) {
Toast.makeText(getApplicationContext(),"Error in Connection ",Toast.LENGTH_LONG);
} finally {
if(connection!=null){
connection.disconnect();
}
return stringBuilder.toString();
}
}
@Override
protected void onPostExecute(String s) {
resultBox.setText(s);
}
}
}
و خروجی: