Android开发全局音量调整的实现方式详解

object DensityUtil {
    @JvmStatic
    fun dp2Px(dpValue: Int): Int {
        return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dpValue.toFloat(), Resources.getSystem().displayMetrics).toInt()
    }
    @JvmStatic
    fun px2Dp(pxValue: Int): Int {
        return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_PX, pxValue.toFloat(), Resources.getSystem().displayMetrics).toInt()
    }
}
// Base类
open class BaseActivity : AppCompatActivity() {
    override fun onResume() {
        super.onResume()
        // 在onResume中添加，确保在主布局添加完成后添加，避免被遮挡。
        initVolumeControllerView()
    }
    private fun initVolumeControllerView() {
        val controllerView = AppCompatImageView(this)
        controllerView.layoutParams = FrameLayout.LayoutParams(DensityUtil.dp2Px(80), DensityUtil.dp2Px(12)).apply {
            gravity = Gravity.START
            marginStart = DensityUtil.dp2Px(20)
            topMargin = DensityUtil.dp2Px(10)
        }
        controllerView.setImageResource(R.drawable.shape_vollume_controller)
        controllerView.setOnClickListener {
            runOnUiThread { Toast.makeText(this, "点击了全局按钮", Toast.LENGTH_SHORT).show() }
        }
        val rootView = findViewById<FrameLayout>(android.R.id.content)
        rootView.addView(controllerView)
    }
}

class VolumeControllerDialog : DialogFragment() {
    private var binding: LayoutVolumeContollerDialogBinding? = null
    private var currentVolume = 0
    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        dialog?.window?.run {
            setBackgroundDrawable(ContextCompat.getDrawable(requireContext(), android.R.color.transparent))
            decorView.setBackgroundResource(android.R.color.transparent)
            val layoutParams = attributes
            layoutParams.width = DensityUtil.dp2Px(360)
            layoutParams.height = WindowManager.LayoutParams.WRAP_CONTENT
            layoutParams.gravity = Gravity.CENTER
            attributes = layoutParams
        }
        binding = DataBindingUtil.inflate(inflater, R.layout.layout_volume_contoller_dialog, container, false)
        return binding?.root
    }
    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        val audioManager = requireContext().getSystemService(Context.AUDIO_SERVICE) as AudioManager
        currentVolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC)
        val step = 1
        binding?.run {
            btnMute.text = getMuteButtonString(audioManager.isStreamMute(AudioManager.STREAM_MUSIC))
            btnIncreaseVolume.setOnClickListener {
                // 增加音量
                currentVolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC)
                audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, currentVolume + step, AudioManager.FLAG_SHOW_UI or AudioManager.FLAG_PLAY_SOUND)
                btnMute.text = getMuteButtonString(audioManager.isStreamMute(AudioManager.STREAM_MUSIC))
            }
            btnReduceVolume.setOnClickListener {
                //减少音量
                currentVolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC)
                audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, if (currentVolume - step < 0) 0 else currentVolume - step, AudioManager.FLAG_SHOW_UI or AudioManager.FLAG_PLAY_SOUND)
                btnMute.text = getMuteButtonString(audioManager.isStreamMute(AudioManager.STREAM_MUSIC))
            }
            btnMute.setOnClickListener {
                // 静音或取消静音
                val currentMute = audioManager.isStreamMute(AudioManager.STREAM_MUSIC)
                if (currentVolume == 0) {
                    btnMute.text = getMuteButtonString(true)
                } else {
                    btnMute.text = getMuteButtonString(!currentMute)
                }
                val setVolume = if (currentMute) {
                    currentVolume
                } else {
                    currentVolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC)
                    0
                }
                audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, setVolume, AudioManager.FLAG_SHOW_UI or AudioManager.FLAG_PLAY_SOUND)
            }
        }
    }
    private fun getMuteButtonString(mute: Boolean): String {
        return if (mute) "UnMute" else "Mute"
    }
}
open class BaseActivity : AppCompatActivity() {
    override fun onResume() {
        super.onResume()
        // 在onResume中添加，确保在主布局添加完成后添加，避免被遮挡。
        initVolumeControllerView()
    }
    private fun initVolumeControllerView() {
        val controllerView = AppCompatImageView(this)
        controllerView.layoutParams = FrameLayout.LayoutParams(DensityUtil.dp2Px(80), DensityUtil.dp2Px(12)).apply {
            gravity = Gravity.START
            marginStart = DensityUtil.dp2Px(20)
            topMargin = DensityUtil.dp2Px(10)
        }
        controllerView.setImageResource(R.drawable.shape_vollume_controller)
        controllerView.setOnClickListener {
            VolumeControllerDialog().show(supportFragmentManager, null)
        }
        val rootView = findViewById<FrameLayout>(android.R.id.content)
        rootView.addView(controllerView)
    }
}