android java seekbar example

android java seekbar example

activity_main.xml

Drag the seek bar from the pallete, now activity_main.xml will look like this:

File: activity_main.xml

1. <?xml version="1.0" encoding="utf-8"?>  
2. <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"  
3.     xmlns:app="http://schemas.android.com/apk/res-auto"  
4.     xmlns:tools="http://schemas.android.com/tools"  
5.     android:layout_width="match_parent"  
6.     android:layout_height="match_parent"  
7.     tools:context="example.nowlearn.com.seekbar.MainActivity">  
8.   
9.   
10.     <SeekBar  
11.         android:id="@+id/seekBar"  
12.         android:layout_width="match_parent"  
13.         android:layout_height="wrap_content"  
14.         android:layout_marginEnd="8dp"  
15.         android:layout_marginStart="8dp"  
16.         android:layout_marginTop="372dp"  
17.         app:layout_constraintEnd_toEndOf="parent"  
18.         app:layout_constraintStart_toStartOf="parent"  
19.         app:layout_constraintTop_toTopOf="parent" />  
20. </android.support.constraint.ConstraintLayout>  

Activity class

Let's see the Activity class displaying seek bar and performing event handling.

File: MainActivity.java

1. package example.nowlearn.com.seekbar;  
2.   
3. import android.support.v7.app.AppCompatActivity;  
4. import android.os.Bundle;  
5. import android.widget.SeekBar;  
6. import android.widget.Toast;  
7.   
8. public class MainActivity extends AppCompatActivity {  
9.     SeekBar seekBar;  
10.     @Override  
11.     protected void onCreate(Bundle savedInstanceState) {  
12.         super.onCreate(savedInstanceState);  
13.         setContentView(R.layout.activity_main);  
14.   
15.         seekBar=(SeekBar)findViewById(R.id.seekBar);  
16.         seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {  
17.             @Override  
18.             public void onProgressChanged(SeekBar seekBar, int progress,  
19.                                           boolean fromUser) {  
20.                 Toast.makeText(getApplicationContext(),"seekbar progress: "+progress, Toast.LENGTH_SHORT).show();  
21.             }  
22.   
23.             @Override  
24.             public void onStartTrackingTouch(SeekBar seekBar) {  
25.                 Toast.makeText(getApplicationContext(),"seekbar touch started!", Toast.LENGTH_SHORT).show();  
26.             }  
27.   
28.             @Override  
29.             public void onStopTrackingTouch(SeekBar seekBar) {  
30.                 Toast.makeText(getApplicationContext(),"seekbar touch stopped!", Toast.LENGTH_SHORT).show();  
31.             }  
32.         });  
33.     }  
34. }  

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Output: