Beberapa Tips untuk Meningkatkan Kecepatan Koneksi Internet di Android

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Android Gallery Control

In Android the Gallery control is a selection control that displays items in a horizontal gallery. the items in the gallery appear beside each other. they can appear separated by a pre-defined space.

remember that there is a sample demo application for the gallery to download at the end of the post

we can use the gallery to display String items using a simple ArrayAdapter.
so lets see how to create a gallery that displays the word "Hello" in several languages:

the layout:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
 android_orientation="vertical"
 android_layout_width="fill_parent"
 android_layout_height="fill_parent"
 >
<TextView 
 android_layout_width="fill_parent" 
 android_layout_height="wrap_content" 
 android_text="Gallery Demo"
 />
 <Gallery
 android_id="@+id/gallery"
 android_layout_width="fill_parent" 
 android_layout_height="wrap_content"
 android_gravity="center_horizontal"
 android_spacing="100px"
 
 />
</LinearLayout>

and in the OnCreate method

@Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.main);
 gallery=(Gallery)findViewById(R.id.gallery);
 //String array holding the values
 String [] text=new String[]{"Hello","Hi","Alloha","Bonjour","Hallo","¡Hola"};
 //Array adapter to display our values in the gallery control
 ArrayAdapter arr=new ArrayAdapter(this, android.R.layout.simple_gallery_item, text);
gallery.setAdapter(arr);
}

the gallery will be like this

we can increse the spacing between the items by increasing the value of android:spacing property.

we can display a scroll bar to indicate the position of the current selected item in the gallery like this:

<Gallery
 android_id="@+id/gallery"
 android_layout_width="fill_parent" 
 android_layout_height="wrap_content"
 android_gravity="center_horizontal"
 android_spacing="100px"
 android_scrollbars="horizontal"
 android_scrollbarFadeDuration="0"
 android_scrollX="100px"
 />

setting the android:scrollbarFadeDuration="0" makes the scroll bar always visible.

The android:scrollX property defines the initial scroll offset of the scroll bar which is the initial distance that the gallery is scrolled for.

Handling Gallery Events
since the gallery is a selction Control (a adapter view) so it can register a OnItemSelectedListener to handle the selection of items within the gallery.

final String [] text=new String[]{"Hello","Hi","Alloha","Bonjour","Hallo","¡Hola"};
gallery.setOnItemSelectedListener(new OnItemSelectedListener() {

 @Override
 public void onItemSelected(AdapterView parent, View view,
 int position, long id) {
 // TODO Auto-generated method stub
 TextView txt=(TextView)findViewById(R.id.txt);
 txt.setText(text[position].toString());
 }

 @Override
 public void onNothingSelected(AdapterView parent) {
 // TODO Auto-generated method stub
 
 }
 });

now the final step is to add two navigation buttons: Next and Previous to navigate throught the items in the gallery.
the layout is gonna be like this:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
 android_orientation="vertical"
 android_layout_width="fill_parent"
 android_layout_height="fill_parent"
 >
<TextView 
 android_layout_width="fill_parent" 
 android_layout_height="wrap_content" 
 android_text="Gallery Demo"
 android_id="@+id/txt"
 />
 <Gallery
 android_id="@+id/gallery"
 android_layout_width="fill_parent" 
 android_layout_height="wrap_content"
 android_gravity="center_horizontal"
 android_spacing="100px"
 android_scrollbars="horizontal"
 android_scrollbarFadeDuration="0"
 android_scrollX="100px"
 />
 <LinearLayout
 android_layout_width="fill_parent"
 android_layout_height="wrap_content"
 android_orientation="horizontal"
 android_layout_marginTop="5px"
 > 
 <Button 
 android_text="Previous"
 android_layout_width="wrap_content"
 android_layout_height="wrap_content"
 android_id="@+id/btnPrev"
 android_onClick="onClick"
 />
 <Button 
 android_text="Next"
 android_layout_width="wrap_content"
 android_layout_height="wrap_content"
 android_id="@+id/btnNext"
 android_onClick="onClick"
 />

 </LinearLayout> 
 
</LinearLayout>

now in order to keep track of the index of the currently selected item we need to define two variables

//Variable to store the number of items in the gallery
 int ItemsInGallery=0;
 int CurrentIndex=0;

and the navigation buttons click handlers:

@Override
 public void onClick(View v) {
 // TODO Auto-generated method stub
 switch(v.getId())
 {
 case R.id.btnNext:
 //Increase the index
 CurrentIndex++;
 //if reached the end of the gallery, then start from the first item
 if(CurrentIndex>ItemsInGallery-1)
 CurrentIndex=0;
 gallery.setSelection(CurrentIndex,true);
 txt.setText(String.valueOf(CurrentIndex));
 break;
 case R.id.btnPrev:
 //Decrease the index
 CurrentIndex=CurrentIndex-1;
 //If reached the first item, then return to the last item in the gallery
 if(CurrentIndex<0)
 CurrentIndex=ItemsInGallery-1;
 gallery.setSelection(CurrentIndex,true);
 txt.setText(String.valueOf(CurrentIndex));
 break;
 }
 }

you can download a sample program from here

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Inilah beberapa aplikasi yg TIDAK BERGUNA di android

Mungkin dari kita banyak yg mempercayai aplikasi unik yg keren dari playstore
Brarti Bukan semuanya keren,ada juga apliksi yang keren tapi hanya tipuan belaka, misalnya Aplikasi LASER
Sudah termasuk logika,masa sihh led flash smartphone kita bisa berubah jadi laser? apakah anda pernah berpikir kayak begitu
Jawabanya pasti nggak lahh? knapa? karena led flash sudah dipastikan mengeluarkan cahaya warna putih seperti senter saja, mana mungkin bisa jadi laser?

saya sudah jelaskan diatas, dan sebenarnya masih banyak lagi aplikasi nggak jelas/nggak guna/cuma nyampah di ponsel kita

berikut aplikasi aplikasi yg saya sarankan jangan didownload

1.Pembersih Junk/Cache di android
Pasti kalian pernah ada yg menggunakkan aplikasi tersebut,tapi nggak semuanya berfungsi untuk membersihkan junk/cache di ponsel anda,sebenarnya aplikasi tersebut dibuat oleh developernya hanya untuk menjadi terkenal,semakin banyak yg download,semakin banyak juga dia mendapatkan uang,Maka dari itu kita harus bisa memilih aplikasi yg bener bener BISA MEMBERSIHKAN JUNK/CACHE DIPONSEL KITA

2.Aplikasi Laser
sepertinya tidak saya jelaskan lagi soalnya saya sudah jelaskan hehe..

3.Antivirus
antivirus juga sama seperti Pembersih junk/cache,mereka membuat aplikasi ini,untuk kekayaan semata,sama artinya yg tidak mendeteksi adanya virus yg masuk diponsel kita,Namun ada juga yg benar benar mendeteksi adanya virus [REAL TIME]
maka dari itu kamu harus cerdas memilih aplikasi yg mana yg asli atau palsu
moga bermanfaat

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