Update value from seek bar and add it to progress bar

Objective:

This is the simple seekbar to demonstrate how to get value from seekbar and apply it to progress bar. When user slide the seekbar, the percentage result will be displayed.

---

Project Info:

Application Name: seekbars

Build SDK: API 15, Android 4.0.3 (ICS)

Miniumum Required SDK: API 8, Android 2.2 (Froyo)
Additional Files created: None
Default Files edited: Two

---

1. Create a default project. The project tree will look like this.

---

2. Edited MainAcitvity.java

package com.example.seekbars;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.ProgressBar;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;

public class MainActivity extends Activity {

    SeekBar seekbar; //SeekBar variable
    TextView value; //TextView variable
    ProgressBar progressbar; //ProgressBar variable

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        seekbar = (SeekBar) findViewById(R.id.seekBar1); //link "seekbar" with "seekBar1" from xml
        value = (TextView) findViewById(R.id.textView1); //link "value" with "textView1" from xml
        progressbar = (ProgressBar) findViewById(R.id.progressBar1); //link "progress" with "progressBar1" from xml

        seekbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() { //link "seekbar" with seek bar change listener
            public void onProgressChanged(SeekBar seekBar, int progress,
                    boolean fromUser) {
                value.setText("SeekBar at " + progress + "%"); //update "progress" value and pass it to textview
                progressbar.setProgress(progress); // also update "progress" value and pass it to progress bar
            }

            public void onStartTrackingTouch(SeekBar seekBar) {
                // TODO Auto-generated method stub
            }

            public void onStopTrackingTouch(SeekBar seekBar) {
                // TODO Auto-generated method stub
            }
        });

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}

---

3. Edit 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" >

    <SeekBar
        android:id="@+id/seekBar1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="28dp" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_marginTop="86dp"
        android:gravity="center" />

    <ProgressBar
        android:id="@+id/progressBar1"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_below="@+id/textView1" />

</RelativeLayout>

---

Note:

---

Project download link: https://osdevlab.googlecode.com/svn/trunk/tut3.0