# Manage media and devices (/en/realtime-media/voice/build/control-audio-and-devices/volume-control-and-mute/android)

> For AI agents: see the complete documentation index at [llms.txt](/llms.txt).

This page shows you how to configure volume settings for audio recording, audio playback, and for the playback of music files.

## Understand the tech [#understand-the-tech]

Agora Voice SDK supports adjusting the audio volume for both recording and playback to meet practical application use-cases. For example, during a two-person call, you can mute a remote user by adjusting the playback volume setting to 0.

      
    The figure below shows the workflow of adjusting the volume.

    **Volume adjust workflow**

    ![VolumeControlMute](https://assets-docs.agora.io/images/video-sdk/volume-control-mute-adjustVolume.svg)

    **Playback** refers to transmitting an audio signal from a sender to a recipient, where it is played back through a playback device.

    **In-ear monitoring** refers to the process of playing audio captured by a device.

    **Recording** refers to the process in which audio signals are captured by a recording device and then sent to the transmitter.

    <CalloutContainer type="warning">
      <CalloutDescription>
        If you set the volume too high using the signal volume adjustment methods, it may lead to audio distortion on some devices.
      </CalloutDescription>
    </CalloutContainer>

    ## Prerequisites [#prerequisites]

    Ensure that you have implemented the [SDK quickstart](../index.mdx) in your project.

    ## Implement volume control [#implement-volume-control]

    Use one or more of the following volume control methods to adjust volume settings.

    ### Mute and unmute users [#mute-and-unmute-users]

    To mute or unmute the local audio stream, call `muteLocalAudioStream`:

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        ```java
        // Stop publishing the local audio stream
        mRtcEngine.muteLocalAudioStream(true);

        // Resume publishing the local audio stream
        mRtcEngine.muteLocalAudioStream(false);
        ```
      </CodeBlockTab>

      <CodeBlockTab value="kotlin">
        ```kotlin
        // Stop publishing the local audio stream
        mRtcEngine.muteLocalAudioStream(true)

        // Resume publishing the local audio stream
        mRtcEngine.muteLocalAudioStream(false)
        ```
      </CodeBlockTab>
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    To mute or unmute a remote user, call `muteRemoteAudioStream` with the `uid` of the remote user:

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        ```java
        // Stop subscribing to the audio stream of the remote user
        mRtcEngine.muteRemoteAudioStream(remoteUid, true);

        // Resume subscribing to the audio stream of the remote user
        mRtcEngine.muteRemoteAudioStream(remoteUid, false);
        ```
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        ```kotlin
        // Stop subscribing to the audio stream of the remote user
        mRtcEngine.muteRemoteAudioStream(remoteUid, true)

        // Resume subscribing to the audio stream of the remote user
        mRtcEngine.muteRemoteAudioStream(remoteUid, false)
        ```
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    <CalloutContainer type="info">
      <CalloutDescription>
        To mute remote users without unsubscribing, set their [playback volume](#adjust-the-playback-volume) to `0`.
      </CalloutDescription>
    </CalloutContainer>

    ### Adjust the playback volume [#adjust-the-playback-volume]

    Call `adjustPlaybackSignalVolume` or `adjustUserPlaybackSignalVolume` to adjust the volume of the audio playback signal.

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        ```java
        int volume = 50;
        int uid = 123456;
        // Set the local playback volume for all remote users
        mRtcEngine.adjustPlaybackSignalVolume(volume);
        // Set the local playback volume for a specific remote user. For example, a user with uid=123
        mRtcEngine.adjustUserPlaybackSignalVolume(uid, volume);
        ```
      </CodeBlockTab>

      <CodeBlockTab value="kotlin">
        ```kotlin
        val volume = 50
        val uid = 123456

        // Set the local playback volume for all remote users
        mRtcEngine.adjustPlaybackSignalVolume(volume)

        // Set the local playback volume for a specific remote user (e.g., user with uid=123)
        mRtcEngine.adjustUserPlaybackSignalVolume(uid, volume)
        ```
      </CodeBlockTab>
    </CodeBlockTabs>

    ### Adjust the in-ear monitoring volume [#adjust-the-in-ear-monitoring-volume]

    During the process of audio capture, mixing, and playback, Agora enables you to adjust the in-ear monitoring volume. Enable and set the volume using `enableInEarMonitoring` and `setInEarMonitoringVolume`.

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        ```java
        // Enable in-ear monitoring
        mRtcEngine.enableInEarMonitoring(true);
        int volume = 50;
        // Adjust in-ear monitoring volume
        mRtcEngine.setInEarMonitoringVolume(volume);
        ```
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        ```kotlin
        // Enable in-ear monitoring
        mRtcEngine.enableInEarMonitoring(true)

        val volume = 50
        // Adjust in-ear monitoring volume
        mRtcEngine.setInEarMonitoringVolume(volume)
        ```
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    ### Adjust the recording volume [#adjust-the-recording-volume]

    Call `adjustRecordingSignalVolume` to adjust the volume of the audio recording signal.

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        ```java
        ChannelMediaOptions options = new ChannelMediaOptions();
        options.clientRoleType = Constants.CLIENT_ROLE_BROADCASTER;
        mRtcEngine.joinChannel(token, channelName, 1234, options);
        // Adjust the recording signal volume to 50
        int vol = 50;
        mRtcEngine.adjustRecordingSignalVolume(vol);
        ```
      </CodeBlockTab>

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        ```kotlin
        // Create ChannelMediaOptions and set client role
        val options = ChannelMediaOptions().apply {
          clientRoleType = Constants.CLIENT_ROLE_BROADCASTER
        }

        // Join channel
        mRtcEngine.joinChannel(token, channelName, 1234, options)

        // Adjust the recording signal volume to 50
        val vol = 50
        mRtcEngine.adjustRecordingSignalVolume(vol)
        ```
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    When configuring audio settings, it's essential to understand the default behavior and the options available. Here are the key points to keep in mind:

    * The SDK defaults to a device volume of `85` when using the recording device to capture audio signals.
    * A volume of `0` means mute, and a volume of `255` represents the maximum volume of the device.
    * If the SDK detects that the recording volume is too low in the current environment, it automatically increases the volume of the recording device.
    * The volume of the recording device directly influences the global volume of the device.
    * If the default recording device volume does not meet your requirements, adjust it by regulating the signal amplitude captured by the microphone or sound card.

    ### Get volume information of users [#get-volume-information-of-users]

    Voice SDK enables you to obtain the user IDs and corresponding volumes of the three users with the highest instantaneous volumes in a channel during the process of audio recording, mixing, and playback. You use the `onAudioVolumeIndication` callback to obtain this information. A returned `uid` of `0` in the callback indicates the local user.

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        ```java
        private final IRtcEngineEventHandler mRtcEventHandler = new IRtcEngineEventHandler()
        {
           // ...
           // Retrieve the user IDs of the three users with the highest instantaneous speaking volume,
           // their respective volumes, and determine whether the local user is speaking.
           @Override
           public void onAudioVolumeIndication(AudioVolumeInfo[] speakers, int totalVolume) {
           }
        };
        ```
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        ```kotlin
        private val mRtcEventHandler = object : IRtcEngineEventHandler() {
          // Retrieve the user IDs of the three users with the highest instantaneous speaking volume,
          // their respective volumes, and determine whether the local user is speaking.
          override fun onAudioVolumeIndication(speakers: Array<AudioVolumeInfo>?, totalVolume: Int) {
            // Your implementation here
          }
        }
        ```
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    <CalloutContainer type="info">
      <CalloutDescription>
        Call `enableAudioVolumeIndication` to enable reporting of the users' volume in the callback.
      </CalloutDescription>
    </CalloutContainer>

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        ```java
        // Enable the onAudioVolumeIndication callback
         mRtcEngine.enableAudioVolumeIndication(1000, 3, true);
        ```
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        ```kotlin
        // Enable the onAudioVolumeIndication callback
        mRtcEngine.enableAudioVolumeIndication(1000, 3, true)
        ```
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    ## Reference [#reference]

    This section contains content that completes the information on this page, or points you to documentation that explains other aspects to this product.

    ### API reference [#api-reference]

    * [`adjustRecordingSignalVolume`](https://api-ref.agora.io/en/video-sdk/android/4.x/API/class_irtcengine.html#api_irtcengine_adjustrecordingsignalvolume)
    * [`adjustPlaybackSignalVolume`](https://api-ref.agora.io/en/video-sdk/android/4.x/API/class_irtcengine.html#api_irtcengine_adjustplaybacksignalvolume)
    * [`adjustUserPlaybackSignalVolume`](https://api-ref.agora.io/en/video-sdk/android/4.x/API/class_irtcengine.html#api_irtcengine_adjustuserplaybacksignalvolume)
    * [`adjustAudioMixingPlayoutVolume`](https://api-ref.agora.io/en/video-sdk/android/4.x/API/class_irtcengine.html#api_irtcengine_adjustaudiomixingplayoutvolume)
    * [`enableInEarMonitoring` \[2/2\]](https://api-ref.agora.io/en/video-sdk/android/4.x/API/class_irtcengine.html#api_irtcengine_enableinearmonitoring2)
    * [`setInEarMonitoringVolume`](https://api-ref.agora.io/en/video-sdk/android/4.x/API/class_irtcengine.html#api_irtcengine_setinearmonitoringvolume)
    * [`onAudioVolumeIndication`](https://api-ref.agora.io/en/video-sdk/android/4.x/API/class_irtcengineeventhandler.html#callback_irtcengineeventhandler_onaudiovolumeindication)
    * [`muteLocalAudioStream`](https://api-ref.agora.io/en/video-sdk/android/4.x/API/class_irtcengine.html#api_irtcengine_mutelocalaudiostream)
    * [`muteRemoteAudioStream`](https://api-ref.agora.io/en/video-sdk/android/4.x/API/class_irtcengine.html#api_irtcengine_muteremoteaudiostream)

    ### Sample projects [#sample-projects]

    Agora offers the following open-source sample project for adjusting recording, playback, and in-ear monitoring volumes for your reference.

    * GitHub: [JoinChannelAudio](https://github.com/AgoraIO/API-Examples/blob/main/Android/APIExample/app/src/main/java/io/agora/api/example/examples/basic/JoinChannelAudio.java)

    ### Frequently asked questions [#frequently-asked-questions]

    * [How can I solve the problem of low volume?](/en/api-reference/faq/quality/audio_low)

    ### See also [#see-also]

    * [Custom audio source](custom-audio.mdx)
    * [Custom video source](/en/realtime-media/video/build/capture-and-render-video/custom-video)