Learning Objective: Let’s check out few components like RadioButton, , WebView, Toast, Soft Keyboard, Progressbar, Implicit Intent, Explicit Intent, Popup Menu, Checkbox, Switch Button, etc.
RadioButton Example (Source)
package example.javatpoint.com.radiobutton;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
Button button;
RadioButton genderradioButton;
RadioGroup radioGroup;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
radioGroup=(RadioGroup)findViewById(R.id.radioGroup);
}
public void onclickbuttonMethod(View v){
int selectedId = radioGroup.getCheckedRadioButtonId();
genderradioButton = (RadioButton) findViewById(selectedId);
if(selectedId==-1){
Toast.makeText(MainActivity.this,"Nothing selected", Toast.LENGTH_SHORT).show();
}
else{
Toast.makeText(MainActivity.this,genderradioButton.getText(), Toast.LENGTH_SHORT).show();
}
}
} XML Code for Radio Button
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="example.javatpoint.com.radiobutton.MainActivity">
<TextView
android:id="@+id/textView1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="30dp"
android:gravity="center_horizontal"
android:textSize="22dp"
android:text="Single Radio Buttons" />
<!-- Default RadioButtons -->
<RadioButton
android:id="@+id/radioButton1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Radio Button 1"
android:layout_marginTop="20dp"
android:textSize="20dp" />
<RadioButton
android:id="@+id/radioButton2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Radio Button 2"
android:layout_marginTop="10dp"
android:textSize="20dp" />
<View
android:layout_width="fill_parent"
android:layout_height="1dp"
android:layout_marginTop="20dp"
android:background="#B8B894" />
<TextView
android:id="@+id/textView2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="30dp"
android:gravity="center_horizontal"
android:textSize="22dp"
android:text="Radio button inside RadioGroup" />
<!-- Customized RadioButtons -->
<RadioGroup
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/radioGroup">
<RadioButton
android:id="@+id/radioMale"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text=" Male"
android:layout_marginTop="10dp"
android:checked="false"
android:textSize="20dp" />
<RadioButton
android:id="@+id/radioFemale"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text=" Female"
android:layout_marginTop="20dp"
android:checked="false"
android:textSize="20dp" />
</RadioGroup>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Show Selected"
android:id="@+id/button"
android:onClick="onclickbuttonMethod"
android:layout_gravity="center_horizontal" />
</LinearLayout> Webview Example
WebView mywebview = (WebView) findViewById(R.id.webView1);
mywebview.loadUrl("http://www.adarshspatel.in/"); Toast Example
Toast.makeText(getApplicationContext(), "Message", Toast.LENGTH_LONG).show();How to close/hide the Android soft keyboard programmatically? (Source)
// Check if no view has focus:
View view = this.getCurrentFocus();
if (view != null) {
InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
}Progressbar Example (Source)
ProgressDialog progressBar = new ProgressDialog(this);
progressBar.setCancelable(true);//you can cancel it by pressing back button
progressBar.setMessage("File downloading ...");
progressBar.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressBar.setProgress(0);//initially progress is 0
progressBar.setMax(100);//sets the maximum value 100
progressBar.show();//displays the progress bar Implicit Intent (Source)
Implicit Intent doesn’t specifiy the component. In such case, intent provides information of available components provided by the system that is to be invoked.
Intent intent=new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse("http://www.javatpoint.com"));
startActivity(intent); Explicit Intent
Explicit Intent specifies the component. In such case, intent provides the external class to be invoked.
Intent i = new Intent(getApplicationContext(), ActivityTwo.class);
startActivity(i); Popup Menu
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="@+id/one"
android:title="One" />
<item
android:id="@+id/two"
android:title="Two"/>
<item
android:id="@+id/three"
android:title="Three"/>
</menu>
PopupMenu popup = new PopupMenu(MainActivity.this, button);
//Inflating the Popup using xml file
popup.getMenuInflater().inflate(R.menu.popup_menu, popup.getMenu());
//registering popup with OnMenuItemClickListener
popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
public boolean onMenuItemClick(MenuItem item) {
Toast.makeText(MainActivity.this,"You Clicked : " + item.getTitle(), Toast.LENGTH_SHORT).show();
return true;
}
});
popup.show();//showing popup menu Checkbox Example (Source)
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="example.javatpoint.com.checkbox.MainActivity">
<CheckBox
android:id="@+id/checkBox"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="144dp"
android:layout_marginTop="68dp"
android:text="Pizza"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<CheckBox
android:id="@+id/checkBox2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="144dp"
android:layout_marginTop="28dp"
android:text="Coffee"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/checkBox" />
<CheckBox
android:id="@+id/checkBox3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="144dp"
android:layout_marginTop="28dp"
android:text="Burger"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/checkBox2" />
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="144dp"
android:layout_marginTop="184dp"
android:text="Order"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/checkBox3" />
</android.support.constraint.ConstraintLayout> package example.javatpoint.com.checkbox;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
CheckBox pizza,coffe,burger;
Button buttonOrder;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
addListenerOnButtonClick();
}
public void addListenerOnButtonClick(){
//Getting instance of CheckBoxes and Button from the activty_main.xml file
pizza=(CheckBox)findViewById(R.id.checkBox);
coffe=(CheckBox)findViewById(R.id.checkBox2);
burger=(CheckBox)findViewById(R.id.checkBox3);
buttonOrder=(Button)findViewById(R.id.button);
//Applying the Listener on the Button click
buttonOrder.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View view) {
int totalamount=0;
StringBuilder result=new StringBuilder();
result.append("Selected Items:");
if(pizza.isChecked()){
result.append("\nPizza 100Rs");
totalamount+=100;
}
if(coffe.isChecked()){
result.append("\nCoffe 50Rs");
totalamount+=50;
}
if(burger.isChecked()){
result.append("\nBurger 120Rs");
totalamount+=120;
}
result.append("\nTotal: "+totalamount+"Rs");
//Displaying the message on the toast
Toast.makeText(getApplicationContext(), result.toString(), Toast.LENGTH_LONG).show();
}
});
}
} Send SMS
//Getting intent and PendingIntent instance
Intent intent=new Intent(getApplicationContext(),MainActivity.class);
PendingIntent pi=PendingIntent.getActivity(getApplicationContext(), 0, intent,0);
//Get the SmsManager instance and call the sendTextMessage method to send message
SmsManager sms=SmsManager.getDefault();
sms.sendTextMessage("0000000000", null, "hello javatpoint", pi,null); <uses-permission android:name="android.permission.SEND_SMS"/>
Broadcast Receiver (Source)
public class MyReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context, "Intent Detected.", Toast.LENGTH_LONG).show();
}
}<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<receiver android:name="MyReceiver">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED">
</action>
</intent-filter>
</receiver>
</application>How do I pass data between Activities in Android application?
Check out answer on Stackoverflow
How to check if a service is running on Android?