Mark's coding playground...

Here is simple gallery application.Copy and download the code and try it out..... public class mygalleryactivity extends Activity { Integer[] imageIDs = { R.drawable.pic1, R.drawable.pic2, R.drawable.pic3, R.drawable.pic4, R.drawable.pic5, R.drawable.pic6, R.drawable.pic7 }; Gallery gallery; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); gallery=(Gallery) findViewById(R.id.Gallery01); gallery.setAdapter(new ImageAdapter(this)); gallery.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView parent, View v, int position ,long id) { // TODO Auto-generated method stub Toast.makeText(getBaseContext(), "pic" + (position + 1) + "selected", Toast.LENGTH_SHORT).show(); ImageView imageView =(ImageView) findViewById(R.id.image1); imag...

Toggle Button is a special button that has two states  for eg :"on" and "off".It can be an alternative to Radio Buttons. Method to create a Custom Toggle Button is given below : in custom_btn.xml in style.xml : in custom_toggle_bg.xml : in custom_toggle_btn.xml :                                              

Listview is simply a group of view that displays a list of scrolling items. "Adapters" are used to insert list items to the list.By default we are able to provide only text as list items.In order to delete a row from listview, copy or download this javacode and try yourself. Also see here : Android – Bullets in ListView ListView in Alphabetic Order in ANDROID Single Selection ListView in android Simple ListView in Android java file : public class SimpleListViewActivity extends Activity { private ListView mainListView; private ArrayAdapter<String> listAdapter; ArrayList<String> all_rowtext = new ArrayList<String>() ; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // Find the ListView resource. mainListView = (ListView) findViewById(R.id.mainListView); all_rowtext.add("Angel"); all_rowtext.add("Mark"); all_rowtext.add("Coding...

in main.xml file: < ?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" > < Button android:id="@+id/button1" android:layout_width="120dp" android:layout_height="wrap_content" android:text="Button" /> < /LinearLayout> in dialog.xml :(xml for custom dialog box) : < ?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" > < ImageView android:id="@+id/imageView1" android:layout_widt...

Call a new xml file which includes the frames that are to be loaded: < ?xml version="1.0" encoding="utf-8"?> < animation-list android:oneshot="false" xmlns:android="http://schemas.android.com/apk/res/android"> < item android:drawable="@drawable/frame_above95_1" android:duration="30"/> < item android:drawable="@drawable/frame_above95_2" android:duration="30"/> < item android:drawable="@drawable/frame_above95_3" android:duration="30"/> < item android:drawable="@drawable/frame_above95_4" android:duration="30"/> < item android:drawable="@drawable/frame_above95_5" android:duration="30"/> < item android:drawable="@drawable/frame_above95_6" android:duration="30"/> < item android:drawable="@drawable/frame_above95_7" android:duration="...

Bitmap bmImg; ImageView img1; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.sending_card); img1=(ImageView) findViewById(R.id.imageView1); String url="http://i.123g.us/c/efeb_valen_happy/card/107397.gif"; downloadFile(url); } void downloadFile(String fileUrl){ URL myFileUrl =null; try { myFileUrl= new URL(fileUrl); } catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { HttpURLConnection conn= (HttpURLConnection)myFileUrl.openConnection(); conn.setDoInput(true); conn.connect(); InputStream is = conn.getInputStream(); bmImg = BitmapFactory.decodeStream(is); img1.setImageBitm...

Code for reading from a text file in asset folder to a textview: public class Readfile extends Activity { String path; ArrayList data = new ArrayList (); @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); path = getResources().getString(R.string.directory1); String[] data1 = null; AssetManager am = getResources().getAssets(); try { data1 = am.list(path); } catch (Exception e) { } for (String name : data1) { data.add(name); } Readoperation(); } public void Readoperation() { // TODO Auto-generated method stub TextView txt = (TextView) findViewById(R.id.text); try { path=getResources().getString(R.string.directory1) +"/"+data.get(2); InputStream stream = getAssets().open(path); int size = stre...

See more basics on Android along with interview questions public class MainActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ViewPager viewPager = (ViewPager)findViewById(R.id.view_pager); ImagePagerAdapter adapter = new ImagePagerAdapter(); viewPager.setAdapter(adapter); } private class ImagePagerAdapter extends PagerAdapter { private int[] mImages = new int[] { R.drawable.chiang_mai, R.drawable.himeji, R.drawable.petronas_twin_tower, R.drawable.ulm }; @Override public int getCount() { return mImages.length; } @Override public boolean isViewFromObject(View view, Object object) { return view == ((ImageView) object); } @Override public Object instantiateItem(ViewGroup container, int position) { Context context = MainActivity.this; ImageView imageVi...

in main java class: gridView = (GridView) findViewById(R.id.gridView1); gridView.setAdapter(new ImageAdapter(this)); gridView.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView parent,View v,int position,long id) { System.out.println("====>>"+position); Intent i = new Intent(getApplicationContext(),GidImage.class); // passing array index i.putExtra("id", position); startActivity(i); } }); create a new java file with an image view: Intent i = getIntent(); // Selected image id int position = i.getExtras().getInt("id"); ImageAdapter imageAdapter = new ImageAdapter(this); ImageView imageView =(ImageView) findVi...

in First Activity: Intent intent=new Intent(FirstClass.this, SecondClass.class); Bundle bundle=new Bundle(); bundle.putInt("image",R.drawable.ic_launcher); intent.putExtras(bundle); startActivity(intent); in Second Acticity: Bundle bundle=this.getIntent().getExtras(); int pic=bundle.getInt("image"); v.setImageResource(pic); another method: in First Activity: Drawable drawable=imgv.getDrawable(); Bitmap bitmap= ((BitmapDrawable)drawable).getBitmap(); ByteArrayOutputStream baos = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos); byte[] b = baos.toByteArray(); Intent intent=new Intent(Passimage.this,myclass.class); intent.putExtra("picture", b); startActivity(intent); in Second Acticity: Bundle extras = getIntent().getExtras(); byte[] b = extras.getByteArray("picture"); Bitmap bmp = BitmapFactory.decodeByteArray(b, 0, b.lengt...

in xml file: < pre class="brush: java"< < ?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" > < GridView android:id="@+id/gridView1" android:numColumns="auto_fit" android:gravity="center" android:columnWidth="50dp" android:stretchMode="columnWidth" android:layout_width="fill_parent" android:layout_height="fill_parent" > < /GridView> < /LinearLayout> in java file: public class Gridviewactivity extends Activity { GridView gridView; static final String[] numbers = new String[] { "A", "B", "C", "D", "E", "F", ...

Listview is simply a group of view that displays a list of scrolling items. "Adapters" are used to insert list items to the list.By default we are able to provide only text as list items.In order to insert other attributes make a customized listview. Copy or download this javacode and try yourself. Also see here : Android – Bullets in ListView ListView in Alphabetic Order in ANDROID Single Selection ListView in android Simple ListView in Android java file : public class CustomListView extends Activity { static final String[] items = new String[]{"Sunday","Monday","Tuesday","Wednesday", "Thursday","Friday",""Saturday"}; ListView listview; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); listview=(ListView) findViewByI...