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Android : SeekBar

Tutorial by:      Date: 2018-01-23 04:22:28

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Android SeekBar is a sort of ProgressBar with draggable thumb. The end client can drag the thum left and appropriate to move the advance of melody, document download and so forth. 

The SeekBar.OnSeekBarChangeListener interface gives techniques to perform notwithstanding taking care of for look for bar. 

Android SeekBar and RatingBar classes are the sub classes of AbsSeekBar.

Android SeekBar Example

activity_main.xml

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

File: activity_main.xml

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"  
    android:paddingLeft="@dimen/activity_horizontal_margin"  
    android:paddingRight="@dimen/activity_horizontal_margin"  
    android:paddingTop="@dimen/activity_vertical_margin"  
    tools:context=".MainActivity" >  

    <SeekBar  
        android:id="@+id/seekBar1"  
        android:layout_width="match_parent"  
        android:layout_height="wrap_content"  
        android:layout_alignParentTop="true"  
        android:layout_centerHorizontal="true"  
        android:layout_marginTop="39dp" />  
RelativeLayout>  

Activity class

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

File: MainActivity.java

package com.example.seekbar;  
import android.os.Bundle;  
import android.app.Activity;  
import android.view.Menu;  
import android.widget.SeekBar;  
import android.widget.SeekBar.OnSeekBarChangeListener;  
import android.widget.Toast;  
public class MainActivity extends Activity implements OnSeekBarChangeListener{  
    SeekBar seekBar1;  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
        seekBar1=(SeekBar)findViewById(R.id.seekBar1);  
        seekBar1.setOnSeekBarChangeListener(this);  
    }  
    @Override  
    public void onProgressChanged(SeekBar seekBar, int progress,  
            boolean fromUser) {  
        Toast.makeText(getApplicationContext(),"seekbar progress: "+progress, Toast.LENGTH_SHORT).show();  
    }  
    @Override  
    public void onStartTrackingTouch(SeekBar seekBar) {  
        Toast.makeText(getApplicationContext(),"seekbar touch started!", Toast.LENGTH_SHORT).show();  
    }  
    @Override  
    public void onStopTrackingTouch(SeekBar seekBar) {  
        Toast.makeText(getApplicationContext(),"seekbar touch stopped!", Toast.LENGTH_SHORT).show();  
    }  
    @Override  
    public boolean onCreateOptionsMenu(Menu menu) {  
        // Inflate the menu; this adds items to the action bar if it is present.  
        getMenuInflater().inflate(R.menu.main, menu);  
        return true;  
    }  
} 

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