Mr. Pritesh N. PatelAssistant Professor

MCAISTAR, V. V. Nagar

Mr. Pritesh N. Patel

View are user interface control that are display on screen.

All views are in android.view pacakage.

All of the views in a window are arranged in asingle tree. You can add views either from codeor by specifying a tree of views in one or moreXML layout files

Mr. Pritesh N. Patel

Button – Use to perform user actionTextView – Use to

perform display textEditText – Use to input

data from user

CheckBox – Use to select multiple option

ImageView – Use to display Image

Spinner – Use to select from given list (ComboBox)

RadioButton – Use to select single option

ProgressBar– Use to show work in progress

ToggleButton – Use to selecte on/off state

Mr. Pritesh N. Patel

XML code<Button

android:id="@+id/sampleBtn"android:text="@string/press_me"android:layout_width="fill_parent"android:layout_height="wrap_content" />

Java code

myBtn=(Button)findViewById(R.id.sampleBtn);myTxt=(TextView)findViewById(R.id.msgTxt);

myBtn.setOnClickListener(new View.OnClickListener() {

@Overridepublic void onClick(View v) {

myTxt.setText("Button has been Pressed for "+(++i)+" Times.");}

});

Mr. Pritesh N. Patel

XML code

<EditText

android:id="@+id/edittext"

android:layout_width="fill_parent"

android:layout_height="wrap_content" />

Java code

myBtn=(Button)findViewById(R.id.sampleBtn);

et = (EditText) findViewById(R.id.edittext);

myBtn.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

String text=et.getText().toString();Toast msg = Toast.makeText(getBaseContext(),

text, Toast.LENGTH_LONG).show();

}

});Mr. Pritesh N. Patel

XML code

Code - 1

<Spinner android:layout_height="wrap_content"

android:id="@+id/spinner1"

android:layout_width="fill_parent"

android:prompt=“Select Value"/>

Code – 2

<Spinner android:id="@+id/searchCriteria"

android:entries="@array/countrylist“ />

Entry in string.xml<string-array name=“countrylist">

<item>India</item>

<item>USA</item>

<item>Canada</item>

</string-array>Mr. Pritesh N. Patel

Java code

ArrayAdapter<String> adapter;String numbers[] = { "ONE", "TWO", "THREE", "FOUR", "FIVE“ };sp = (Spinner) findViewById(R.id.spinner1);

adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, numbers)

sp.setAdapter(adapter);

sp.setOnItemSelectedListener(new OnItemSelectedListener(){

public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3){

Toast.makeText(getBaseContext(), sp.getSelectedItem().toString(),Toast.LENGTH_LONG).show();

}

});Mr. Pritesh N. Patel

XML code<CheckBox android:id="@+id/check1"

android:layout_width="100px"android:layout_height="wrap_content"android:text="Android" />

Java code

c1 = (CheckBox) findViewById(R.id.check1);if (c1.isChecked()==true && c2.isChecked()==true){

Toast.makeText(this, "Android ", Toast.LENGTH_SHORT).show();

}

Mr. Pritesh N. Patel

XML code<RatingBar android:id="@+id/ratingbar"android:layout_width="wrap_content"android:layout_height="wrap_content" />

Java coderatingbar = (RatingBar) findViewById(R.id.ratingbar);

ratingbar.setOnRatingBarChangeListener(new OnRatingBarChangeListener(){

public void onRatingChanged(RatingBar ratingBar, float rating,boolean fromUser)

{ratings.setText("The Rating is " + rating);

}});

Mr. Pritesh N. Patel

XML code<SeekBar android:id="@+id/seekbar"

android:layout_width="wrap_content"android:layout_height="wrap_content"android:max="100"android:minWidth="250px" />

Java codeseekbar = (SeekBar) findViewById(R.id.seekbar);seekbar.setOnSeekBarChangeListener( new OnSeekBarChangeListener(){

public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser){

value.setText("SeekBar value is "+progress);}

public void onStartTrackingTouch(SeekBar seekBar){

// TODO Auto-generated method stub}

public void onStopTrackingTouch(SeekBar seekBar){

// TODO Auto-generated method stub}

});

XML code<ToggleButton android:id="@+id/togglebutton"

android:layout_width="150px"android:layout_height="50px"android:textOn="ON"android:textOff="OFF" />

Java codetb = (ToggleButton) findViewById(R.id.togglebutton);

tb.setOnClickListener(new OnClickListener(){

public void onClick(View v){

Toast.makeText(getBaseContext(),"Button is "+tb.getText().toString(),

Toast.LENGTH_LONG).show();}

});

To open new activity following startActivity() method will be used.

Intent i = new Intent(getApplicationContext(), SecondScreen.class);

StartActivity(i); Sending parameters to new Activity

i.putExtra("key", "value"); //Syntaxi.putExtra("email", "myemail@gmail.com");

Receiving parameters on new ActivityIntent i = getIntent();i.getStringExtra("key");

String myemail = i.getStringExtra("email");

Mr. Pritesh N. Patel

Mr. Pritesh N. Patel