Android article-How to do a simple Android source code Viewer

Source: Internet
Author: User

1, Web Source viewer:

HttpURLConnection: Used to send or receive data

Mainactivity article:





Import Android.os.Bundle;

Import Android.os.Handler;

Import Android.os.Looper;

Import Android.os.Message;


Import Android.view.Menu;

Import Android.view.View;

Import Android.widget.EditText;

Import Android.widget.TextView;

Import Android.widget.Toast;

public class Mainactivity extends Activity {

protected final int requestsucess = 0; CTRL + SHIFT + X Y

protected final int requestnotfound = 1;

protected final int requestexception = 2;

Private EditText Et_path;

Private TextView tv_reuslt;

Define a handler in the main thread

Private Handler Handler = new Handler () {

This method is executed in the main thread.

public void Handlemessage (Android.os.Message msg) {

So you can update the UI in the main thread.

[1] distinguish which message is sent

Switch (msg.what) {

Case Requestsucess://Representative Request succeeded

String content = (string) msg.obj;

Tv_reuslt.settext (content);


Case Requestnotfound://Representative Request succeeded

Toast.maketext (Getapplicationcontext (), "Request resource does not exist", 0). Show ();


Case Requestexception://Representative Request succeeded

Toast.maketext (Getapplicationcontext (), "Server Busy please later ....", 1). Show ();








protected void OnCreate (Bundle savedinstancestate) {

Super.oncreate (savedinstancestate);

Setcontentview (R.layout.activity_main);

[1] Find the controls we care about

Et_path = (EditText) Findviewbyid (;

Tv_reuslt = (TextView) Findviewbyid (;

[1.1] Print the name of the current thread

System.out.println ("Current thread Name:" +thread.currentthread (). GetName ());


[2] Click the button to view the source code of the specified path

public void Click (View v) {

[2.0] Creating a child thread

New Thread () {public void run () {

try {

[2.1] Get the source path

String path = Et_path.gettext (). toString (). Trim ();

[2.2] Create URL object specify the URL (path) we want to access

URL url = new URL (path);

[2.3] Get HttpURLConnection object for sending or receiving data

HttpURLConnection conn = (httpurlconnection) url.openconnection ();

[2.4] Setting send GET request

Conn.setrequestmethod ("get");//get requires that the default is a GET request

[2.5] Setting the request time-out period

Conn.setconnecttimeout (5000);

[2.6] Get the status code returned by the server

int code = Conn.getresponsecode ();

[2.7] if code = = 200 indicates a successful request

if (code = = 200) {

[2.8] Gets the data returned by the server is returned in the form of a stream because it is a very common operation to change the flow into a string so I pulled out a tool class (Utils)

InputStream in = Conn.getinputstream ();

[2.9] Using our defined tool class to convert in to string

String content = Streamtools.readstream (in);

2.9.0 Creating a Message Object

Message msg = new Message ();

Msg.what = requestsucess;

Msg.obj = content;

2.9.1 took the handler we created and told the system that I wanted to update the UI.

Handler.sendmessage (msg); sent a message (msg) to put the data in the MSG Handlemessage method will be executed

[2.9.1] shows the data in the stream on the TextView, which is the logic of updating the UI.

tv_reuslt.settext (content);


Request resource does not exist toast is a view and cannot update UI in thread

Message msg = new Message ();

Msg.what = requestnotfound;//represents which message

Handler.sendmessage (msg);


} catch (Exception e) {

E.printstacktrace ();

Message msg = new Message ();

Msg.what = requestexception;//represents which message

Handler.sendmessage (msg); Send Message


};}. Start ();



Streamtools and mainactivity in the same bag.



public class Streamtools {

Convert a inputstream into a string

public static String Readstream (InputStream in) throws exception{

Define a memory output stream

Bytearrayoutputstream BAOs = new Bytearrayoutputstream ();

int len =-1;

byte[] buffer = new byte[1024]; 1kb

while (( (buffer))!=-1) {

Baos.write (buffer, 0, Len);


In.close ();

String content = new String (Baos.tobytearray ());

return content;



Activity_main article:

<linearlayout xmlns:android= "Http://"

Xmlns:tools= "Http://"

Android:layout_width= "Match_parent"

android:layout_height= "Match_parent"

android:orientation= "Vertical"

Tools:context= ". Mainactivity ">


Android:id= "@+id/et_path"

Android:layout_width= "Match_parent"

android:layout_height= "Wrap_content"

Android:hint= "Please enter view url"/>


Android:layout_width= "Wrap_content"

android:layout_height= "Wrap_content"

android:onclick= "click"

android:text= "View"/>


Android:layout_width= "Match_parent"

android:layout_height= "Wrap_content" >


Android:id= "@+id/tv_result"

Android:layout_width= "Match_parent"

android:layout_height= "Match_parent"

android:text= "Hagha"/>



Finally, the most important thing is to not forget to configure the license

Android article-How to do a simple Android source code Viewer

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