How to achieve volume control on Android _android

An example of this article describes how Android achieves volume tuning. Share to everyone for your reference. Specifically as follows:

Main.xml Layout file:

<?xml version= "1.0" encoding= "Utf-8"?> <linearlayout xmlns:android= "http://schemas.android.com/apk/res/" Android "android:orientation=" vertical "android:layout_width=" fill_parent "android:layout_height=" Fill_parent " > <button android:id= "@+id/btnplay" android:layout_width= fill_parent "android:layout_height=" Wrap_conten T "android:text=" play Music "/> <linearlayout android:orientation=" Horizontal "android:layout_width=" Wrap_conte NT "android:layout_height=" Wrap_content "android:layout_gravity=" Center_horizontal "> <togglebutton Andro Id:id= "@+id/tbmute" android:layout_width= "fill_parent" android:layout_height= "Wrap_content" Android:tex
    Ton= "Mute" android:textoff= "normal" android:checked= "true" android:layout_gravity= "center_vertical"/> <button android:id= "@+id/btnupper" android:text= "Increase volume" android:layout_width= "Wrap_content" android:l ayout_height= "Wrap_content"/>; Button android:id= "@+id/btnlower" android:text= "Reduce volume" android:layout_width= "Wrap_content" android:layou t_height= "Wrap_content"/> </LinearLayout> </LinearLayout>

Audioactivity class:

Package com.ljq.activity;
Import android.app.Activity;
Import Android.app.Service;
Import Android.media.AudioManager;
Import Android.media.MediaPlayer;
Import Android.os.Bundle;
Import Android.view.View;
Import Android.widget.Button;
Import Android.widget.CompoundButton;
Import Android.widget.ToggleButton;
Import Android.widget.CompoundButton.OnCheckedChangeListener;
  public class Audioactivity extends activity {private Button btnplay=null, Btnupper=null, Btnlower=null;
  Private ToggleButton Tbmute=null; Private MediaPlayer Mediaplayer=null; Audio private Audiomanager audiomanager=null;
    Audio @Override public void onCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);
    Setcontentview (R.layout.main);
    Audiomanager= (Audiomanager) Getsystemservice (Service.audio_service);
    Btnplay= (Button) Findviewbyid (R.id.btnplay);
    Btnupper= (Button) Findviewbyid (r.id.btnupper);
    Btnlower= (Button) Findviewbyid (r.id.btnlower); Btnplay.setonclicklistener (ListEner);
    Btnupper.setonclicklistener (listener);
    Btnlower.setonclicklistener (listener);
    Tbmute= (ToggleButton) Findviewbyid (R.id.tbmute); Tbmute.setoncheckedchangelistener (New Oncheckedchangelistener () {public void oncheckedchanged (Compoundbutton button
    View, Boolean ischecked) {Audiomanager.setstreammute (audiomanager.stream_music,!ischecked);//Set Mute}
  }); } view.onclicklistener listener=new View.onclicklistener () {public void OnClick (View v) {@SuppressWarnings ("U
      nused ") button btn= (button) v; Switch (V.getid ()) {case r.id.btnplay://play Music mediaplayer=mediaplayer.create (Audioactivity.this, R.raw.music
        );
      Mediaplayer.setlooping (TRUE);/set loop play Mediaplayer.start ();//play sound break; Case r.id.btnupper://Increase Volume//adjuststreamvolume: Adjusts the volume audiomanager.adjuststreamvolume of the specified sound type (AUDIOMANAGER.S Tream_music, Audiomanager.adjust_raise, Audiomanager.flag_shOW_UI);
      Increase sound break; Case r.id.btnlower://Decrease Volume//First parameter: Sound type//second parameter: Adjust volume direction//third parameter: Optional flag bit audiomanager.adjusts Treamvolume (Audiomanager.stream_music, Audiomanager.adjust_lower, audiomanager.flag_show_ui);
      Low sound break;
}
    }
  }; }

Run Result:

I hope this article will help you with your Android program.