What is a Constructor in Object Oriented Programming?

Constructor is specialized method that is contained in a class. Constructor will be triggered automatically when an object is created. Purpose of the Constructors is to initialize an object of a class.

Constructor’s name is identical to the Class name. Constructors can take parameters but constructors have no return type. This is because; constructors return an object by itself.

Static Constructor
When a constructor of a class is marked with static modifier, then the constructor is called static constructor. Unlike other constructors, Static constructor cannot be triggered while creating instances of that class.

Static constructors will be automatically triggered when the class is loaded for the first time. Static constructors are used to initialize values for the static variables of that class.

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Spannable String in Android - URL Span ,Clickable Span, Rich-Style Formatting of Textview .....

See more Android Tutorials here....... Faster Loading images in GridViews or ListViews Spannable brings lots of possibility to TextView, includes displaying various appearance of a Text and onClick callbak. The SpannableString class allows you to easily format certain pieces which are called spans of a string, by applying CharacterStyle ie,color, font, ormake it a link . Here is an example where, explained how to use spannable string to give font size, color, linking a text via clickable span and through URL Span and to strike through the text. Lets go through the example : import android.os.Bundle; import android.text.SpannableString; import android.text.method.LinkMovementMethod; import android.text.style.ClickableSpan; import android.text.style.ForegroundColorSpan; import android.text.style.RelativeSizeSpan; import android.text.style.StrikethroughSpan; import android.text.style.URLSpan; import android.view.View; import android.widget.TextView; import android.widget.Toast; ...

Use Your Own SQLite in ANDROID Application or Using 'SQLite Asset Helper' to read your own databases stored in Asset folder

See more basics on Android along with interview questions See SQLite tutorial here If you want to read your own databases in ANDROID APPLICATION, this post may help you. You may be familiar by creating SQLite in Android use SQLiteOpenHelper . Here we are going to deal with using our own databases. I have a database named 'mydatabase.sqlite', which consist of a set of name and age of 5 students. Suppose I want to view the database, I can use SQLite database browser which you can download from here. download browser..... Through this browser we can view the databases, can even modify delete or create a new one. 'mydatabase.sqlite' with name and age of five students is browsed and viewed as shown below Now make a zip format of database and copy this database to asse...

Passing Images between Activities in Android

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...

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