Android ile Twitter‘a benzer bir basit uygulama yazmaya çalıştım. Normalde uygulamaya login olurken username, profil image ve password sqlite veritabanında tutuluyor ve deÄŸerler oradan alınıyor ama örnek sade olsun diye o tarafa girmedim. Bu örneÄŸi daha iyi anlamak için Android Custom ListView Items and Adaptera bakabilirsiniz.
Uygulama image, user_name ve text alanalrından oluÅŸuyor. En son girilen input en ListView‘de en üste ekleniyor.
BlipListActivity.java
package com.blip.list;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
public class BlipListActivity extends Activity {
private ListView listView;
private Button button_send_blip;
private EditText editText_input_text;
private BlipVar blipVar_obj;
private BlipAdapter blipAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
listView=(ListView) findViewById(R.id.listView1_blip);
button_send_blip=(Button) findViewById(R.id.button1_send);
editText_input_text=(EditText) findViewById(R.id.editText1_input);
Conf.arrayList.clear();
// BlipVar object=new BlipVar();
// object.setUser_name("mehmet");
// object.setImage("http://www.ethemsulan.com/wp-content/themes/mahinhin/images/kelime.png");
// object.setText("Merhaba bu bir textttir");
// Conf.arrayList.add(object);
//Kendi adapterimizi yazdik ve listview ile iliÅŸkilendirdik.
blipAdapter=new BlipAdapter(this, Conf.arrayList);
listView.setAdapter(blipAdapter);
button_send_blip.setOnClickListener(send_blip);
}
OnClickListener send_blip=new OnClickListener() {
@Override
public void onClick(View v) {
blipVar_obj=new BlipVar();
blipVar_obj.setUser_name("isil");
blipVar_obj.setImage("http://www.ethemsulan.com/wp-content/themes/mahinhin/images/kelime.png");
blipVar_obj.setText(editText_input_text.getText().toString());
Conf.arrayList.add(0, blipVar_obj);
//Adaptarimiza data girildiğinde kendisini güncelliyor ve girilen data hemen alta eklenir.
//Yani UI güncelleniyor.
blipAdapter.notifyDataSetChanged();
editText_input_text.setText("");
}
};
}
BlipAdapter.java
package com.blip.list;
import java.util.ArrayList;
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class BlipAdapter extends ArrayAdapter<BlipVar>{
//BlipVar nesne listesi "names" ekleniliyor.
private final Activity context;
private ArrayList<BlipVar> names;
public BlipAdapter(Activity context,ArrayList<BlipVar> names) {
//Bu username, textview ve image için layouyt oluşrurup nasıl gösterileceğine karar veriyoruz
//R.layout.blip_adapter
super(context, R.layout.blip_adapter, names);
this.context = context;
this.names = names;
}
static class ViewHolder {
public ImageView imageView;
public TextView textView_user_name,textView_body_text;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
View rowView = convertView;
if (rowView == null) {
LayoutInflater inflater = context.getLayoutInflater();
rowView = inflater.inflate(R.layout.blip_adapter, null, true);
holder = new ViewHolder();
holder.textView_user_name = (TextView) rowView.findViewById(R.id.textView1_user_name);
holder.imageView = (ImageView) rowView.findViewById(R.id.imageView1);
holder.textView_body_text=(TextView) rowView.findViewById(R.id.textView1_blip_text);
rowView.setTag(holder);
} else {
holder = (ViewHolder) rowView.getTag();
}
//Gelen obje içindeki dataları set ediyor.
BlipVar blipVar=names.get(position);
if(blipVar!=null)
{
holder.textView_user_name.setText(blipVar.getUser_name());
holder.imageView.setImageDrawable(Conf.loadImageFromURL(blipVar.getImage()));
holder.textView_body_text.setText(blipVar.getText());
}
return rowView;
}
}
BlipVar.java
package com.blip.list;
public class BlipVar {
//Adapterimizd ehang, alanalr varsa o alanalr tanimlanir.
private String user_name,image,text;
public String getUser_name() {
return user_name;
}
public void setUser_name(String user_name) {
this.user_name = user_name;
}
public String getImage() {
return image;
}
public void setImage(String image) {
this.image = image;
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
}
Conf.java
package com.blip.list;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.Drawable;
import android.util.Log;
public class Conf {
public static ArrayList<BlipVar> arrayList=new ArrayList<BlipVar>();
//Internetten image cekiyor
public static Drawable loadImageFromURL(String url)
{
try
{
InputStream is = (InputStream) new URL(url).getContent();
Drawable d = Drawable.createFromStream(is, "src");
return d;
}catch (Exception e) {
System.out.println(e);
return null;
}
}
private static InputStream OpenHttpConnection(String urlString) throws IOException
{
//Log.d(TAG, "InputStream");
InputStream in = null;
while(in==null){
int response = -1;
URL url = new URL(urlString);
URLConnection conn = url.openConnection();
if (!(conn instanceof HttpURLConnection)) throw new IOException("Not an HTTP connection");
HttpURLConnection httpConn = (HttpURLConnection) conn;
httpConn.setAllowUserInteraction(false);
httpConn.setInstanceFollowRedirects(true);
httpConn.setRequestMethod("GET");
httpConn.setReadTimeout(5000);
httpConn.setConnectTimeout(5000);
httpConn.connect();
response = httpConn.getResponseCode();
if (response == HttpURLConnection.HTTP_OK) {
in = httpConn.getInputStream();
}
}
return in;
}
}
blip_adapter.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" android:orientation="vertical">
<LinearLayout android:layout_width="fill_parent" android:id="@+id/linearLayout1" android:layout_height="wrap_content" android:weightSum="1" android:baselineAligned="true">
<ImageView android:src="@drawable/icon" android:id="@+id/imageView1" android:layout_height="50dip" android:layout_width="60dip" android:layout_marginLeft="10dip"></ImageView>
<TextView android:text="TextView" android:layout_width="wrap_content" android:id="@+id/textView1_user_name" android:textAppearance="?android:attr/textAppearanceLarge" android:layout_height="fill_parent" android:layout_marginLeft="50dip"></TextView>
</LinearLayout>
<LinearLayout android:layout_width="fill_parent" android:id="@+id/linearLayout2" android:layout_height="wrap_content" android:orientation="vertical">
<TextView android:text="TextView" android:layout_width="wrap_content" android:id="@+id/textView1_blip_text" android:layout_height="wrap_content" android:textAppearance="?android:attr/textAppearanceMedium" android:layout_gravity="center"></TextView>
</LinearLayout>
</LinearLayout>
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<LinearLayout android:layout_width="fill_parent" android:id="@+id/linearLayout1" android:layout_height="wrap_content">
<EditText android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:id="@+id/editText1_input" android:inputType="textMultiLine">
<requestFocus></requestFocus>
</EditText>
</LinearLayout>
<Button android:layout_gravity="right" android:text="@string/send_blip" android:id="@+id/button1_send" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
<ListView android:id="@+id/listView1_blip" android:layout_width="fill_parent" android:layout_height="fill_parent"></ListView>
</LinearLayout>
strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, BlipListActivity!</string>
<string name="app_name">BlipList</string>
<string name="send_blip">Send New Blip</string>
</resources>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.blip.list"
android:versionCode="1"
android:versionName="1.0">
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".BlipListActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
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