What is a checkbox in android
The CheckBox in Android can be understood as a type of two-state button. Here, the two-state means that it can be either checked or unchecked. Checkboxes can be used to serve various purposes such as selecting the hobbies of a user and to activate/deactivate a specific action. The CompoundButton class in Android has a subclass named CheckBox class.
Android CheckBox class:
To facilitate the creation of the CheckBoxes, Android provides the android.widget.CheckBox class.
Methods of CheckBox class:
The CheckBox class provides various inherited methods of View.
| Method | Uses |
| public boolean isChecked() | To return true if checked otherwise returns false. |
| public void setChecked(boolean status) | To change the state of the CheckBox. |
Android CheckBox Example:
activity_main.xml:(File: activity_main.xml)
In this example, we will first drag the three checkboxes and one button for the layout in the activity_main.xml file.
Activity class:(File: MainActivity.java)
In the MainActivity.java file, we are writing the code to check if the toggle button is ON/OFF.
package com.example.app1;
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 a,b,c;
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
a=(CheckBox)findViewById(R.id.checkBox);
b=(CheckBox)findViewById(R.id.checkBox2);
c=(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(a.isChecked()){
result.append("\na selected");
totalamount+=1000;
}
if(b.isChecked()){
result.append("\nb selected");
totalamount+=5000;
}
if(c.isChecked()){
result.append("\nc selected");
totalamount+=1200;
}
result.append("\nTotal: "+totalamount+"Rs");
//Displaying the message on the toast
Toast.makeText(getApplicationContext(), result.toString(), Toast.LENGTH_LONG).show();
}
});
}
} |
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