Changing sound pitch with SoundPool Android


activity_main.xml

<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: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"
    android:orientation="vertical" >
    
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Low Pitch"
        android:id = "@+id/low"
         />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Normal"
        android:id = "@+id/normal"
         />
    
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="High"
        android:id = "@+id/high"
        />

</LinearLayout>

MainActivity.java

import android.app.Activity;
import android.media.AudioManager;
import android.media.SoundPool;
import android.media.SoundPool.OnLoadCompleteListener;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity implements OnClickListener{
    
    SoundPool sp;
    private Button low, normal, high;
    float pitch = 0.5f;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        low = (Button) findViewById(R.id.low);
        normal = (Button) findViewById(R.id.normal);
        high = (Button) findViewById(R.id.high);
        
        low.setOnClickListener(this);
        normal.setOnClickListener(this);
        high.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        switch(v.getId()) {
        case R.id.low : pitch = 0.5f;playit();break;
        
        case R.id.normal: pitch = 1.0f;playit();break;
        
        case R.id.high: pitch = 2.0f;playit();break;
        }
        
    }

    private void playit() {
        // TODO Auto-generated method stub
        sp = new SoundPool(1,AudioManager.STREAM_MUSIC,0);
        final int i = sp.load(this, R.raw.music, 0);
        sp.setOnLoadCompleteListener(new OnLoadCompleteListener() {

            @Override
            public void onLoadComplete(SoundPool arg0, int arg1, int arg2) {
                // TODO Auto-generated method stub
                sp.play(i, 1,1,0,0,pitch);    
            }
            
        });
    }
}

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