Android中实时获取扬声器分贝大小

AudioRecord 可以用来监听环境声音。通过计算每段声音可以求声贝

    public double countDb (short[] data)  
    {  
        float BASE=32768f;
        float maxAmplitude = 0;

        for (int i = 0; i < data.length; i++) 
        {
            maxAmplitude += data[i] * data[i];
        }
        maxAmplitude=(float)Math.sqrt(maxAmplitude/data.length);
        float ratio=maxAmplitude / BASE;
        float db =0;
        if(ratio>0)
        {
            db = (float) (20 * Math.log10(ratio))+100;
        }

        return db;
    }