Android development using intent to implement data transfer method _android

This example describes the way Android uses intent to implement data transfer. Share to everyone for your reference, specific as follows:

In the Android development process, many people are familiar with intent, a class that is used to share data among multiple view. This section focuses on selecting the text in ListView, loading the URL in the text into a new page, and printing it. For convenience, I'll start by pasting the code from the previous "Android development using Jsoup parsing HTML page", because the code made a few changes in the previous section:

try {doc = Jsoup.parse (new URL ("http://www.51yam.com"), 5000);
    catch (Malformedurlexception E1) {e1.printstacktrace ();
    catch (IOException E1) {e1.printstacktrace ();
    Final list<map<string, string>> List = new arraylist<map<string, string>> ();
    Elements es = Doc.getelementsbyclass ("Subnav");
      for (int i=0;i<es.size (); i++) {Element e = es.get (i);
      int count = E.getelementsbytag ("a"). Size ();
        for (int j=0;j<count;j++) {map<string, string> Map = new hashmap<string, string> ();
        Element ex = E.getelementsbytag ("a"). Get (j);
        Map.put ("title", Ex.text ());
        Map.put ("href", "http://www.51yam.com/" +ex.attr ("href"));
      List.add (map);
    } ListView ListView = (ListView) Findviewbyid (R.ID.LISTVIEW1); Listview.setadapter New Simpleadapter (this, list, Android.
 R.layout.simple_list_item_2, new string[] {"title", "href"}, new int[] {       Android. R.id.text1,android.

 R.ID.TEXT2}));

The effect of the implementation is as follows:

And then what we need to do is when you click on the item in ListView, the program sends the URL link below each topic to the new page display:

Here's how to use intent to pass data when you click on a ListView project:

Listview.setonitemclicklistener (New Onitemclicklistener () {
  @Override public
  void Onitemclick (Adapterview <?> Parent, View v, int position,long id) {
    //toast.maketext (Getapplicationcontext (), (TextView), duration) C4/>system.out.println ("Position:" +position);
    SYSTEM.OUT.PRINTLN ("ID:" +id);
    Toast.maketext (_getwebresoureactivity.this, list.get (position). Get ("href"), toast.length_short). Show ();
    Intent Intent = new Intent (V.getcontext (), topicdetails.class);
    Intent.putextra ("src", list.get (position). Get ("href"));
    Startactivityforresult (intent,0);
  }
);

In the sub page "Topicdetails.java", we can receive the value passed through in the following way:

Package com.android.web;
Import android.app.Activity;
Import android.content.Intent;
Import Android.os.Bundle;
Import Android.widget.EditText;
Import Java.lang.Object;
public class Topicdetails extends activity {
  private edittext edittext;
  @Override
  protected void onCreate (Bundle savedinstancestate)
  {
    super.oncreate (savedinstancestate);
    Setcontentview (r.layout.topiccontent);
    EditText = (edittext) This.findviewbyid (r.id.edittext);
    String Srcurl = Getintent (). Getstringextra ("src");
    Edittext.settext (Srcurl);
  }

Sure, don't forget to add an activity map (yellow background) in the Androidmanifest.xml file:

 <?xml version= "1.0" encoding= "Utf-8"?> <manifest "xmlns:android=" Schemas.android.com/apk/res/android "package=" Com.android.web "android:versioncode=" 1 "android:versionname=" 1.0 "&
  Gt <USES-SDK android:minsdkversion= "7"/> <!--join access to the network--> <uses-permission android:name= "Android.permi Ssion. INTERNET "/> <application android:icon=" @drawable/ic_launcher "android:label=" @string/app_name "> & Lt;activity android:label= "@string/app_name" android:name= "_getwebresoureactivity" > <intent-filt er > <action android:name= "Android.intent.action.MAIN"/> <category android:name= "Android.inte Nt.category.LAUNCHER "/> </intent-filter> </activity> <activity android:name=". Topicdetail S "></activity> </application> </manifest> 

So when all the work is ready, run the program, click ListView Item, we successfully jump to the sub page:

The following are all the source code:

Main Page Source:

Package com.android.web;
Import Java.io.BufferedInputStream;
Import java.io.IOException;
Import Java.io.InputStream;
Import java.net.MalformedURLException;
Import Java.net.URL;
Import java.net.URLConnection;
Import java.util.ArrayList;
Import Java.util.HashMap;
Import java.util.List;
Import Java.util.Map;
Import Java.lang.Object;
Import Org.apache.http.util.ByteArrayBuffer;
Import Org.apache.http.util.EncodingUtils;
Import Org.jsoup.Jsoup;
Import org.jsoup.nodes.Document;
Import org.jsoup.nodes.Element;
Import org.jsoup.select.Elements;
Import android.app.Activity;
Import android.content.Intent;
Import Android.os.Bundle;
Import Android.view.View;
Import Android.view.View.OnClickListener;
Import Android.widget.AdapterView;
Import Android.widget.AdapterView.OnItemClickListener;
Import Android.widget.ListView;
Import Android.widget.SimpleAdapter;
Import Android.widget.Toast;
  public class _getwebresoureactivity extends activity {Document doc; @Override public void OnCreate (Bundle sAvedinstancestate) {super.oncreate (savedinstancestate);
    Setcontentview (R.layout.main);
        Findviewbyid (R.id.button1). Setonclicklistener (New Onclicklistener () {@Override public void OnClick (View v) {
      Load ();
  }
    });
    protected void Load () {try {doc = Jsoup.parse (new URL ("http://www.51yam.com"), 5000);
    catch (Malformedurlexception E1) {e1.printstacktrace ();
    catch (IOException E1) {e1.printstacktrace ();
    Final list<map<string, string>> List = new arraylist<map<string, string>> ();
    Elements es = Doc.getelementsbyclass ("Subnav");
      for (int i=0;i<es.size (); i++) {Element e = es.get (i);
      int count = E.getelementsbytag ("a"). Size ();
        for (int j=0;j<count;j++) {map<string, string> Map = new hashmap<string, string> ();
        Element ex = E.getelementsbytag ("a"). Get (j);
        Map.put ("title", Ex.text ()); Map.put ("href","http://www.51yam.com/" +ex.attr ("href"));
      List.add (map);
    } ListView ListView = (ListView) Findviewbyid (R.ID.LISTVIEW1); Listview.setadapter New Simpleadapter (this, list, Android. R.layout.simple_list_item_2, new string[] {"title", "href"}, new int[] {Android. R.id.text1,android.
    R.ID.TEXT2})); Listview.setonitemclicklistener (New Onitemclicklistener () {@Override public void Onitemclick (adapterview<?& Gt Parent, View v, int position,long id) {//toast.maketext (Getapplicationcontext (), (TextView), duration) Sy
        Stem.out.println ("Position:" +position);
        SYSTEM.OUT.PRINTLN ("ID:" +id);
        Toast.maketext (_getwebresoureactivity.this, list.get (position). Get ("href"), toast.length_short). Show ();
        Intent Intent = new Intent (V.getcontext (), topicdetails.class);
        Intent.putextra ("src", list.get (position). Get ("href"));
      Startactivityforresult (intent,0);
  }
    }); }/** * @paraM urlstring * @return/public string gethtmlstring (string urlstring) {try {URL url = null;
      url = new URL (urlstring);
      URLConnection Ucon = null;
      Ucon = Url.openconnection ();
      InputStream instr = null;
      InStr = Ucon.getinputstream ();
      Bufferedinputstream bis = new Bufferedinputstream (instr);
      Bytearraybuffer BAF = new Bytearraybuffer (500);
      int current = 0;
      while (current = Bis.read ())!=-1) {Baf.append ((byte) current);
    Return encodingutils.getstring (Baf.tobytearray (), "GBK");
    catch (Exception e) {return "";

 }
  }
}

Sub-page source code:

Package com.android.web;
Import android.app.Activity;
Import android.content.Intent;
Import Android.os.Bundle;
Import Android.widget.EditText;
Import Java.lang.Object;
public class Topicdetails extends activity {
  private edittext edittext;
  @Override
  protected void onCreate (Bundle savedinstancestate)
  {
    super.oncreate (savedinstancestate);
    Setcontentview (r.layout.topiccontent);
    EditText = (edittext) This.findviewbyid (r.id.edittext);
    String Srcurl = Getintent (). Getstringextra ("src");
    Edittext.settext (Srcurl);
  }

For more information on Android-related content readers can view the site topics: "Android Debugging techniques and common problems solution summary", "Android Development introduction and Advanced Course", "Android Multimedia operating skills Summary (audio, video, recording, etc.)", " Android Basic Components Usage Summary, Android View tips Summary, Android layout layout tips and Android Control usage summary

I hope this article will help you with the Android program.