android 锁屏声音修改

最新推荐文章于 2023-02-13 11:31:47 发布

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本文详细介绍了如何使用SoundPool类的playSounds方法修改Android设备的锁屏声音。通过调整leftVolume、rightVolume、priority、loop和rate参数，可以实现不同音量、循环模式和播放速度的个性化设置，从而定制专属的锁屏声音效果。

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SoundPool类下的playSounds方法描写了锁屏的流程：

private void playSounds(boolean locked) {

        // User feedback for keyguard.

        if (mSuppressNextLockSound) {
            mSuppressNextLockSound = false;
            return;
        }

        final ContentResolver cr = mContext.getContentResolver();
        if (Settings.System.getInt(cr, Settings.System.LOCKSCREEN_SOUNDS_ENABLED, 1) == 1) {
            final int whichSound = locked
                ? mLockSoundId
                : mUnlockSoundId;
            mLockSounds.stop(mLockSoundStreamId);
            // Init mAudioManager
            if (mAudioManager == null) {
                mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
                if (mAudioManager == null) return;
                mMasterStreamMaxVolume = mAudioManager.getStreamMaxVolume(MASTER_STREAM_TYPE);
            }
            // If the stream is muted, don't play the sound
            if (mAudioManager.isStreamMute(MASTER_STREAM_TYPE)) return;

            // Adjust the lock sound volume from a minimum of MIN_LOCK_VOLUME to a maximum
            // of MAX_LOCK_VOLUME, relative to the maximum level of the MASTER_STREAM_TYPE volume.
            float lockSoundVolume;
            int masterStreamVolume = mAudioManager.getStreamVolume(MASTER_STREAM_TYPE);
            if (masterStreamVolume == 0) {
                return;
            } else {
             Xlog.d("ZD","masterStreamVolume="+masterStreamVolume);
             Xlog.d("ZD","MIN_LOCK_VOLUME="+MIN_LOCK_VOLUME+"MAX_LOCK_VOLUME"+MAX_LOCK_VOLUME);
             Xlog.d("ZD","mMasterStreamMaxVolume="+mMasterStreamMaxVolume);

                lockSoundVolume = MIN_LOCK_VOLUME + (MAX_LOCK_VOLUME - MIN_LOCK_VOLUME)
                        * ((float) masterStreamVolume / mMasterStreamMaxVolume);
                        Xlog.d("ZD","lock volume="+lockSoundVolume);
            }
            lockSoundVolume = 1.0f;

            mLockSoundStreamId = mLockSounds.play(whichSound, lockSoundVolume, lockSoundVolume, 1,
                    0, 1.0f);
        }

}

masterStreamVolume是系统定义的volume level,play的原型如下：

/**
     * Play a sound from a sound ID.
     *
     * Play the sound specified by the soundID. This is the value
     * returned by the load() function. Returns a non-zero streamID
     * if successful, zero if it fails. The streamID can be used to
     * further control playback. Note that calling play() may cause
     * another sound to stop playing if the maximum number of active
     * streams is exceeded. A loop value of -1 means loop forever,
     * a value of 0 means don't loop, other values indicate the
     * number of repeats, e.g. a value of 1 plays the audio twice.
     * The playback rate allows the application to vary the playback
     * rate (pitch) of the sound. A value of 1.0 means play back at
     * the original frequency. A value of 2.0 means play back twice
     * as fast, and a value of 0.5 means playback at half speed.
     *
     * @param soundID a soundID returned by the load() function
     * @param leftVolume left volume value (range = 0.0 to 1.0)
     * @param rightVolume right volume value (range = 0.0 to 1.0)
     * @param priority stream priority (0 = lowest priority)
     * @param loop loop mode (0 = no loop, -1 = loop forever)
     * @param rate playback rate (1.0 = normal playback, range 0.5 to 2.0)
     * @return non-zero streamID if successful, zero if failed
     */
    public native final int play(int soundID, float leftVolume, float rightVolume,
            int priority, int loop, float rate);