在Android中，是有幾種類型的音量可以調(diào)節(jié)：

STREAM_ALARM 警報
STREAM_MUSIC 音樂回放即媒體音量
STREAM_RING 鈴聲
STREAM_SYSTEM 系統(tǒng)
STREAM_VOICE_CALL 通話

代碼展示

private void initVolume() {
        //獲取系統(tǒng)的Audio管理者
        mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
        //最大音量
        mediaMaxVolume = mAudioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
        //當(dāng)前音量
        mediaVolume = mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC);

        //seekbar設(shè)置最大值為最大音量
        mCarVolume.setMax(mediaMaxVolume);
        //seekbar設(shè)置當(dāng)前進(jìn)度為當(dāng)前音量
        setView();
        mCarVolume.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                //設(shè)置媒體音量為當(dāng)前seekbar進(jìn)度
                mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, progress, 0);
                mediaVolume = mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
                setView();
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

            }
        });
    }

    private void setView() {
        Log.e("ccm=======>", "mediaVolume: " + mediaVolume);
        mCarVolume.setProgress(mediaVolume);
    }

    /*
     * 事件會在用戶按下一個鍵盤按鍵時發(fā)生
     */
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        switch (keyCode) {
            case KeyEvent.KEYCODE_VOLUME_DOWN:
                if (--mediaVolume >= 0) {
                    setView();
                } else {
                    mediaVolume = 0;
                }
                return true;
            case KeyEvent.KEYCODE_VOLUME_UP:
                if (++mediaVolume <= mediaMaxVolume) {
                    setView();
                } else {
                    mediaVolume = mediaMaxVolume;
                }
                return true;
            case KeyEvent.KEYCODE_VOLUME_MUTE:
                setView();
                return true;
        }
        return super.onKeyDown(keyCode, event);
    }

布局展示

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:padding="20dp"
    android:orientation="vertical">

    <SeekBar
        android:id="@+id/car_volume"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>

工具類

/**
 * 音量工具類
 */
public class VolumeUtil {
    private AudioManager mAudioManager;

    public VolumeUtil(){}

    //獲取系統(tǒng)的Audio管理者
    public VolumeUtil(Context context){
        mAudioManager = (AudioManager) context.getSystemService(Service.AUDIO_SERVICE);
    }
    //獲取最大多媒體音量
    public int getMediaMaxVolume(){
        Log.e("ccm=======>", "getMediaMaxVolume: " + mAudioManager.getStreamMaxVolume( AudioManager.STREAM_MUSIC));
        return mAudioManager.getStreamMaxVolume( AudioManager.STREAM_MUSIC );
    }
    //獲取當(dāng)前多媒體音量
    public int getMediaVolume(){
        Log.e("ccm=======>", "getMediaVolume: " +mAudioManager.getStreamVolume( AudioManager.STREAM_MUSIC ));
        return mAudioManager.getStreamVolume( AudioManager.STREAM_MUSIC );
    }

    //獲取最大通話音量
    public int getCallMaxVolume(){
        return mAudioManager.getStreamMaxVolume( AudioManager.STREAM_VOICE_CALL );
    }

    //獲取當(dāng)前通話音量
    public int getCallVolume(){
        return mAudioManager.getStreamVolume( AudioManager.STREAM_VOICE_CALL );
    }

    //獲取最大系統(tǒng)音量
    public int getSystemMaxVolume(){

        return mAudioManager.getStreamMaxVolume(AudioManager.STREAM_SYSTEM );
    }

    //獲取當(dāng)前系統(tǒng)音量
    public int getSystemVolume(){

        return mAudioManager.getStreamVolume(AudioManager.STREAM_SYSTEM );
    }

    //獲取最大提示音量
    public int getAlermMaxVolume(){
        return mAudioManager.getStreamMaxVolume(AudioManager.STREAM_ALARM );
    }

    //獲取當(dāng)前提示音量
    public int getAlermVolume(){
        return mAudioManager.getStreamVolume(AudioManager.STREAM_ALARM );
    }

    // 設(shè)置多媒體音量
    public void setMediaVolume(int volume){
        mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, //音量類型
                volume,
                AudioManager.FLAG_PLAY_SOUND
                        | AudioManager.FLAG_SHOW_UI);
    }

    //設(shè)置通話音量
    public void setCallVolume(int volume){
        mAudioManager.setStreamVolume( AudioManager.STREAM_VOICE_CALL,
                volume,
                AudioManager.FLAG_PLAY_SOUND
                        | AudioManager.FLAG_SHOW_UI);
    }

    //設(shè)置提示音量
    public void setAlermVolume(int volume){
        mAudioManager.setStreamVolume( AudioManager.STREAM_ALARM,
                volume,AudioManager.FLAG_PLAY_SOUND
                        |AudioManager.FLAG_SHOW_UI);
    }

    // 關(guān)閉/打開揚(yáng)聲器播放
    public void setSpeakerStatus(boolean on) {
        if (on) { //揚(yáng)聲器
            mAudioManager.setSpeakerphoneOn(true);
            mAudioManager.setMode(AudioManager.MODE_NORMAL);
        } else {
            // 設(shè)置最大音量
            int max = mAudioManager.getStreamMaxVolume(AudioManager.STREAM_VOICE_CALL);
            mAudioManager.setStreamVolume(AudioManager.STREAM_VOICE_CALL, max, AudioManager.STREAM_VOICE_CALL);
            // 設(shè)置成聽筒模式
            mAudioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);
            mAudioManager.setSpeakerphoneOn(false);// 關(guān)閉揚(yáng)聲器
            mAudioManager.setRouting(AudioManager.MODE_NORMAL, AudioManager.ROUTE_EARPIECE, AudioManager.ROUTE_ALL);
        }
    }

}