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Summary: Constants | Methods | Inherited Methods

# Call.RttCall

`public static final class Call.RttCall`
`extends Object` ``

java.lang.Object
↳ | android.telecom.Call.RttCall

A class that holds the state that describes the state of the RTT channel to the remote party, if it is active.

## Summary

### Constants
`int` | `RTT_MODE_FULL` Indicates that there should be a bidirectional audio stream between the two parties on the call.
`int` | `RTT_MODE_HCO` Indicates that the local user should be able to hear the audio stream from the remote user, but not vice versa.
`int` | `RTT_MODE_VCO` Indicates that the remote user should be able to hear the audio stream from the local user, but not vice versa.

### Public methods
`int` | `getRttAudioMode()` Returns the current RTT audio mode.
`String` | `read()` Reads a string from the remote user, blocking if there is no data available.
`String` | `readImmediately()` Non-blocking version of `read()`.
`void` | `setRttMode(int mode)` Sets the RTT audio mode.
`void` | `write(String input)` Writes the string into the outgoing text stream for this RTT call.

### Inherited methods
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

## Constants

### RTT_MODE_FULL

    public static final int RTT_MODE_FULL

Indicates that there should be a bidirectional audio stream between the two parties on the call.

Constant Value: 1 (0x00000001)

### RTT_MODE_HCO

    public static final int RTT_MODE_HCO

Indicates that the local user should be able to hear the audio stream from the remote user, but not vice versa. Equivalent to muting the microphone.

Constant Value: 2 (0x00000002)

### RTT_MODE_VCO

    public static final int RTT_MODE_VCO

Indicates that the remote user should be able to hear the audio stream from the local user, but not vice versa. Equivalent to setting the volume to zero.

Constant Value: 3 (0x00000003)

## Public methods

### getRttAudioMode

    public int getRttAudioMode ()

Returns the current RTT audio mode.

Returns
`int` | Current RTT audio mode. One of `RTT_MODE_FULL`, `RTT_MODE_VCO`, or `RTT_MODE_HCO`.

### read

    public String read ()

Reads a string from the remote user, blocking if there is no data available. Returns `null` if the RTT conversation has been terminated and there is no further data to read. This method is not thread-safe -- calling it from multiple threads simultaneously may lead to interleaved text.

Returns
`String` | A string containing text sent by the remote user, or `null` if the conversation has been terminated or if there was an error while reading.

### readImmediately

    public String readImmediately ()

Non-blocking version of `read()`. Returns `null` if there is nothing to be read.

Returns
`String` | A string containing text entered by the user, or `null` if the user has not entered any new text yet.

Throws
`IOException` |

### setRttMode

    public void setRttMode (int mode)

Sets the RTT audio mode. The requested mode change will be communicated through `Callback#onRttModeChanged(Call, int)`.

Parameters
`mode` | `int`: The desired RTT audio mode, one of `RTT_MODE_FULL`, `RTT_MODE_VCO`, or `RTT_MODE_HCO`. Value is android.telecom.Call.RttCall.RTT_MODE_INVALID, `RTT_MODE_FULL`, `RTT_MODE_HCO`, or `RTT_MODE_VCO`

### write

    public void write (String input)

Writes the string into the outgoing text stream for this RTT call. Since RTT transmits text in real-time, this method should be called once for each character the user enters into the device. This method is not thread-safe -- calling it from multiple threads simultaneously may lead to interleaved text.

Throws
`IOException` |

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