Android 音量控制

/**
 * Created by maple on 2020-09-14 08:57
 * E-Mail Address：740917401@qq.com
 */

import android.content.Context;
import android.media.AudioManager;
import android.support.annotation.IntDef;

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;


public class AudioManagerHelper {

    private final String TAG = "AudioManagerHelper";
    private final boolean OpenLog = true;

    private AudioManager audioManager;
    private int NOW_AUDIO_TYPE = TYPE_MUSIC;
    private int NOW_FLAG = FLAG_NOTHING;
    private int VOICE_STEP_100 = 2; //0-100的步进。

    /**
     * 封装：STREAM_类型
     */
    public final static int TYPE_MUSIC = AudioManager.STREAM_MUSIC;
    public final static int TYPE_ALARM = AudioManager.STREAM_ALARM;
    public final static int TYPE_RING = AudioManager.STREAM_RING;
    @IntDef({TYPE_MUSIC, TYPE_ALARM, TYPE_RING})
    @Retention(RetentionPolicy.SOURCE)
    public @interface TYPE {}

    /**
     * 封装：FLAG
     */
    public final static int FLAG_SHOW_UI = AudioManager.FLAG_SHOW_UI;
    public final static int FLAG_PLAY_SOUND = AudioManager.FLAG_PLAY_SOUND;
    public final static int FLAG_NOTHING = 0;
    @IntDef({FLAG_SHOW_UI, FLAG_PLAY_SOUND, FLAG_NOTHING})
    @Retention(RetentionPolicy.SOURCE)
    public @interface FLAG {}

    /**
     * 初始化，获取音量管理者
     * @param context   上下文
     */
    public AudioManagerHelper(Context context) {
        audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
    }

    public int getSystemMaxVolume() {
        return audioManager.getStreamMaxVolume(NOW_AUDIO_TYPE);
    }

    public int getSystemCurrentVolume() {
        return audioManager.getStreamVolume(NOW_AUDIO_TYPE);
    }

    /**
     * 以0-100为范围，获取当前的音量值
     * @return  获取当前的音量值
     */
    public int get100CurrentVolume() {
        return 100*getSystemCurrentVolume()/getSystemMaxVolume();
    }

    /**
     * 修改步进值
     * @param step  step
     * @return  this
     */
    public AudioManagerHelper setVoiceStep100(int step) {
        VOICE_STEP_100 = step;
        return this;
    }

    /**
     * 改变当前的模式，对全局API生效
     * @param type
     * @return
     */
    public AudioManagerHelper setAudioType(@TYPE int type) {
        NOW_AUDIO_TYPE = type;
        return this;
    }

    /**
     * 改变当前FLAG，对全局API生效
     * @param flag
     * @return
     */
    public AudioManagerHelper setFlag(@FLAG int flag) {
        NOW_FLAG = flag;
        return this;
    }

    public AudioManagerHelper addVoiceSystem() {
        audioManager.adjustStreamVolume(NOW_AUDIO_TYPE,AudioManager.ADJUST_RAISE,NOW_FLAG);
        return this;
    }

    public AudioManagerHelper subVoiceSystem() {
        audioManager.adjustStreamVolume(NOW_AUDIO_TYPE,AudioManager.ADJUST_LOWER,NOW_FLAG);
        return this;
    }

    /**
     * 调整音量，自定义
     * @param num   0-100
     * @return  改完后的音量值
     */
    public int setVoice100(int num) {
        int a = (int) Math.ceil((num)*getSystemMaxVolume()*0.01);
        a = a<=0 ? 0 : a;
        a = a>=100 ? 100 : a;
        audioManager.setStreamVolume(NOW_AUDIO_TYPE,a,0);
        return get100CurrentVolume();
    }

    /**
     * 步进加，步进值可修改
     *  0——100
     * @return  改完后的音量值
     */
    public int addVoice100() {
        int a = (int) Math.ceil((VOICE_STEP_100 + get100CurrentVolume())*getSystemMaxVolume()*0.01);
        a = a<=0 ? 0 : a;
        a = a>=100 ? 100 : a;
        audioManager.setStreamVolume(NOW_AUDIO_TYPE,a,NOW_FLAG);
        return get100CurrentVolume();
    }

    /**
     * 步进减，步进值可修改
     *  0——100
     * @return  改完后的音量值
     */
    public int subVoice100() {
        int a = (int) Math.floor((get100CurrentVolume() - VOICE_STEP_100)*getSystemMaxVolume()*0.01);
        a = a<=0 ? 0 : a;
        a = a>=100 ? 100 : a;
        audioManager.setStreamVolume(NOW_AUDIO_TYPE,a,NOW_FLAG);
        return get100CurrentVolume();
    }
}