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# ProtoOutputStream

`public final class ProtoOutputStream`
`extends Object` ``

java.lang.Object
↳ | android.util.proto.ProtoOutputStream

Class to write to a protobuf stream.

This API is not as convenient or type safe as the standard protobuf classes. If possible, the best recommended library is to use protobuf lite. However, in environments (such as the Android platform itself), a more memory efficient version is necessary.

Each write method takes an ID code from the protoc generated classes and the value to write. To make a nested object, call `start(long)` and then `end(long)` when you are done.

The ID codes have type information embedded into them, so if you call the incorrect function you will get an `IllegalArgumentException`.

To retrieve the encoded protobuf stream, call `getBytes()`. stream as the top-level objects are finished.

## Summary

### Constants
`long` | `FIELD_COUNT_MASK` Bit mask for selecting the field count when reading a field id that is used with a ``ProtoOutputStream`.write(...)` method.
`long` | `FIELD_COUNT_PACKED` Repeated packed field count, encoded into a field id used with a ``ProtoOutputStream`.write(...)` method.
`long` | `FIELD_COUNT_REPEATED` Repeated field count, encoded into a field id used with a ``ProtoOutputStream`.write(...)` method.
`int` | `FIELD_COUNT_SHIFT` Bit offset for building a field id to be used with a ``ProtoOutputStream`.write(...)`.
`long` | `FIELD_COUNT_SINGLE` Single field count, encoded into a field id used with a ``ProtoOutputStream`.write(...)` method.
`long` | `FIELD_COUNT_UNKNOWN` Unknown field count, encoded into a field id used with a ``ProtoOutputStream`.write(...)` method.
`int` | `FIELD_ID_SHIFT` Number of bits to shift the field number to form a tag.
`long` | `FIELD_TYPE_BOOL` Field type code for bool fields.
`long` | `FIELD_TYPE_BYTES` Field type code for bytes fields.
`long` | `FIELD_TYPE_DOUBLE` Field type code for double fields.
`long` | `FIELD_TYPE_ENUM` Field type code for enum fields.
`long` | `FIELD_TYPE_FIXED32` Field type code for fixed32 fields.
`long` | `FIELD_TYPE_FIXED64` Field type code for fixed64 fields.
`long` | `FIELD_TYPE_FLOAT` Field type code for float fields.
`long` | `FIELD_TYPE_INT32` Field type code for int32 fields.
`long` | `FIELD_TYPE_INT64` Field type code for int64 fields.
`long` | `FIELD_TYPE_MASK` Mask for the field types stored in a fieldId.
`long` | `FIELD_TYPE_MESSAGE` Field type code for message fields.
`long` | `FIELD_TYPE_SFIXED32` Field type code for sfixed32 fields.
`long` | `FIELD_TYPE_SFIXED64` Field type code for sfixed64 fields.
`int` | `FIELD_TYPE_SHIFT` Position of the field type in a (long) fieldId.
`long` | `FIELD_TYPE_SINT32` Field type code for sint32 fields.
`long` | `FIELD_TYPE_SINT64` Field type code for sint64 fields.
`long` | `FIELD_TYPE_STRING` Field type code for string fields.
`long` | `FIELD_TYPE_UINT32` Field type code for uint32 fields.
`long` | `FIELD_TYPE_UINT64` Field type code for uint64 fields.
`int` | `WIRE_TYPE_END_GROUP` End group wire type code.
`int` | `WIRE_TYPE_FIXED32` Fixed32 wire type code.
`int` | `WIRE_TYPE_FIXED64` Fixed64 wire type code.
`int` | `WIRE_TYPE_LENGTH_DELIMITED` Length delimited wire type code.
`int` | `WIRE_TYPE_MASK` Mask to select the wire type from a tag.
`int` | `WIRE_TYPE_START_GROUP` Start group wire type code.
`int` | `WIRE_TYPE_VARINT` Varint wire type code.

### Public constructors
`ProtoOutputStream()` Construct a `ProtoOutputStream` with the default chunk size.
`ProtoOutputStream(int chunkSize)` Construct a {@link ProtoOutputStream with the given chunk size.
`ProtoOutputStream(OutputStream stream)` Construct a `ProtoOutputStream` that sits on top of an `OutputStream`.

### Public methods
`static int` | `checkFieldId(long fieldId, long expectedFlags)` Validates that the fieldId provided is of the type and count from expectedType.
`void` | `dump(String tag)` Dump debugging data about the buffers with the given log tag.
`void` | `end(long token)` End the object started by start() that returned token.
`void` | `flush()` Write remaining data to the output stream.
`byte[]` | `getBytes()` Finish the encoding of the data, and return a byte[] with the protobuf formatted data.
`static String` | `getFieldCountString(long fieldCount)` Get the developer-usable name of a field count.
`static String` | `getFieldIdString(long fieldId)` Get a debug string for a fieldId.
`static String` | `getFieldTypeString(long fieldType)` Get the developer-usable name of a field type.
`int` | `getRawSize()` Returns the total size of the data that has been written, after full protobuf encoding has occurred.
`static String` | `getWireTypeString(int wireType)` Get the developer-usable name of a wire type.
`static long` | `makeFieldId(int id, long fieldFlags)` Combine a fieldId (the field keys in the proto file) and the field flags.
`static long` | `makeToken(int tagSize, boolean repeated, int depth, int objectId, int offset)` Make a token.
`long` | `start(long fieldId)` Start a sub object.
`static String` | `token2String(long token)` Return a debugging string of a token.
`void` | `write(long fieldId, String val)` Write a string value for the given fieldId.
`void` | `write(long fieldId, boolean val)` Write a boolean value for the given fieldId.
`void` | `write(long fieldId, int val)` Write a value for the given fieldId.
`void` | `write(long fieldId, float val)` Write a value for the given fieldId.
`void` | `write(long fieldId, long val)` Write a value for the given fieldId.
`void` | `write(long fieldId, double val)` Write a value for the given fieldId.
`void` | `write(long fieldId, byte[] val)` Write a byte[] value for the given fieldId.
`void` | `writeTag(int id, int wireType)` Write an individual field tag by hand.

### 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

### FIELD_COUNT_MASK

    public static final long FIELD_COUNT_MASK

Bit mask for selecting the field count when reading a field id that is used with a ``ProtoOutputStream`.write(...)` method.

See also:

- `FIELD_COUNT_SHIFT`
- `FIELD_COUNT_MASK`
- `FIELD_COUNT_UNKNOWN`
- `FIELD_COUNT_SINGLE`
- `FIELD_COUNT_REPEATED`
- `FIELD_COUNT_PACKED`
- Protobuf Encoding

Constant Value: 16492674416640 (0x00000f0000000000)

### FIELD_COUNT_PACKED

    public static final long FIELD_COUNT_PACKED

Repeated packed field count, encoded into a field id used with a ``ProtoOutputStream`.write(...)` method.

See also:

- `FIELD_COUNT_SHIFT`
- `FIELD_COUNT_MASK`
- `FIELD_COUNT_UNKNOWN`
- `FIELD_COUNT_SINGLE`
- `FIELD_COUNT_REPEATED`
- Protobuf Encoding

Constant Value: 5497558138880 (0x0000050000000000)

### FIELD_COUNT_REPEATED

    public static final long FIELD_COUNT_REPEATED

Repeated field count, encoded into a field id used with a ``ProtoOutputStream`.write(...)` method.

See also:

- `FIELD_COUNT_SHIFT`
- `FIELD_COUNT_MASK`
- `FIELD_COUNT_UNKNOWN`
- `FIELD_COUNT_SINGLE`
- `FIELD_COUNT_PACKED`
- Protobuf Encoding

Constant Value: 2199023255552 (0x0000020000000000)

### FIELD_COUNT_SHIFT

    public static final int FIELD_COUNT_SHIFT

Bit offset for building a field id to be used with a ``ProtoOutputStream`.write(...)`.

See also:

- `FIELD_COUNT_MASK`
- `FIELD_COUNT_UNKNOWN`
- `FIELD_COUNT_SINGLE`
- `FIELD_COUNT_REPEATED`
- `FIELD_COUNT_PACKED`

Constant Value: 40 (0x00000028)

### FIELD_COUNT_SINGLE

    public static final long FIELD_COUNT_SINGLE

Single field count, encoded into a field id used with a ``ProtoOutputStream`.write(...)` method.

See also:

- `FIELD_COUNT_SHIFT`
- `FIELD_COUNT_MASK`
- `FIELD_COUNT_UNKNOWN`
- `FIELD_COUNT_REPEATED`
- `FIELD_COUNT_PACKED`
- Protobuf Encoding

Constant Value: 1099511627776 (0x0000010000000000)

### FIELD_COUNT_UNKNOWN

    public static final long FIELD_COUNT_UNKNOWN

Unknown field count, encoded into a field id used with a ``ProtoOutputStream`.write(...)` method.

See also:

- `FIELD_COUNT_SHIFT`
- `FIELD_COUNT_MASK`
- `FIELD_COUNT_SINGLE`
- `FIELD_COUNT_REPEATED`
- `FIELD_COUNT_PACKED`
- Protobuf Encoding

Constant Value: 0 (0x0000000000000000)

### FIELD_ID_SHIFT

    public static final int FIELD_ID_SHIFT

Number of bits to shift the field number to form a tag.

     // Reading a field number from a tag.
     int fieldNumber = tag >>> FIELD_ID_SHIFT;

     // Building a tag from a field number and a wire type.
     int tag = (fieldNumber << FIELD_ID_SHIFT) | wireType;

See also:

- Protobuf Encoding

Constant Value: 3 (0x00000003)

### FIELD_TYPE_BOOL

    public static final long FIELD_TYPE_BOOL

Field type code for bool fields. Used to build constants in generated code for use with the `ProtoOutputStream.write(long, boolean)` method.

Constant Value: 34359738368 (0x0000000800000000)

### FIELD_TYPE_BYTES

    public static final long FIELD_TYPE_BYTES

Field type code for bytes fields. Used to build constants in generated code for use with the `ProtoOutputStream.write(long, byte[])` method.

Constant Value: 51539607552 (0x0000000c00000000)

### FIELD_TYPE_DOUBLE

    public static final long FIELD_TYPE_DOUBLE

Field type code for double fields. Used to build constants in generated code for use with the `ProtoOutputStream.write(long, double)` method.

Constant Value: 4294967296 (0x0000000100000000)

### FIELD_TYPE_ENUM

    public static final long FIELD_TYPE_ENUM

Field type code for enum fields. Used to build constants in generated code for use with the `ProtoOutputStream.write(long, int)` method.

Constant Value: 60129542144 (0x0000000e00000000)

### FIELD_TYPE_FIXED32

    public static final long FIELD_TYPE_FIXED32

Field type code for fixed32 fields. Used to build constants in generated code for use with the `ProtoOutputStream.write(long, int)` method.

Constant Value: 30064771072 (0x0000000700000000)

### FIELD_TYPE_FIXED64

    public static final long FIELD_TYPE_FIXED64

Field type code for fixed64 fields. Used to build constants in generated code for use with the `ProtoOutputStream.write(long, long)` method.

Constant Value: 25769803776 (0x0000000600000000)

### FIELD_TYPE_FLOAT

    public static final long FIELD_TYPE_FLOAT

Field type code for float fields. Used to build constants in generated code for use with the `ProtoOutputStream.write(long, float)` method.

Constant Value: 8589934592 (0x0000000200000000)

### FIELD_TYPE_INT32

    public static final long FIELD_TYPE_INT32

Field type code for int32 fields. Used to build constants in generated code for use with the `ProtoOutputStream.write(long, int)` method.

Constant Value: 21474836480 (0x0000000500000000)

### FIELD_TYPE_INT64

    public static final long FIELD_TYPE_INT64

Field type code for int64 fields. Used to build constants in generated code for use with the `ProtoOutputStream.write(long, long)` method.

Constant Value: 12884901888 (0x0000000300000000)

### FIELD_TYPE_MASK

    public static final long FIELD_TYPE_MASK

Mask for the field types stored in a fieldId. Leaves a whole byte for future expansion, even though there are currently only 17 types.

Constant Value: 1095216660480 (0x000000ff00000000)

### FIELD_TYPE_MESSAGE

    public static final long FIELD_TYPE_MESSAGE

Field type code for message fields. Used to build constants in generated code for use with the `ProtoOutputStream.start(long)` method.

Constant Value: 47244640256 (0x0000000b00000000)

### FIELD_TYPE_SFIXED32

    public static final long FIELD_TYPE_SFIXED32

Field type code for sfixed32 fields. Used to build constants in generated code for use with the `ProtoOutputStream.write(long, int)` method.

Constant Value: 64424509440 (0x0000000f00000000)

### FIELD_TYPE_SFIXED64

    public static final long FIELD_TYPE_SFIXED64

Field type code for sfixed64 fields. Used to build constants in generated code for use with the `ProtoOutputStream.write(long, long)` method.

Constant Value: 68719476736 (0x0000001000000000)

### FIELD_TYPE_SHIFT

    public static final int FIELD_TYPE_SHIFT

Position of the field type in a (long) fieldId.

Constant Value: 32 (0x00000020)

### FIELD_TYPE_SINT32

    public static final long FIELD_TYPE_SINT32

Field type code for sint32 fields. Used to build constants in generated code for use with the `ProtoOutputStream.write(long, int)` method.

Constant Value: 73014444032 (0x0000001100000000)

### FIELD_TYPE_SINT64

    public static final long FIELD_TYPE_SINT64

Field type code for sint64 fields. Used to build constants in generated code for use with the `ProtoOutputStream.write(long, long)` method.

Constant Value: 77309411328 (0x0000001200000000)

### FIELD_TYPE_STRING

    public static final long FIELD_TYPE_STRING

Field type code for string fields. Used to build constants in generated code for use with the `ProtoOutputStream.write(long, String)` method.

Constant Value: 38654705664 (0x0000000900000000)

### FIELD_TYPE_UINT32

    public static final long FIELD_TYPE_UINT32

Field type code for uint32 fields. Used to build constants in generated code for use with the `ProtoOutputStream.write(long, int)` method.

Constant Value: 55834574848 (0x0000000d00000000)

### FIELD_TYPE_UINT64

    public static final long FIELD_TYPE_UINT64

Field type code for uint64 fields. Used to build constants in generated code for use with the `ProtoOutputStream.write(long, long)` method.

Constant Value: 17179869184 (0x0000000400000000)

### WIRE_TYPE_END_GROUP

    public static final int WIRE_TYPE_END_GROUP

End group wire type code.

See also:

- Protobuf Encoding

Constant Value: 4 (0x00000004)

### WIRE_TYPE_FIXED32

    public static final int WIRE_TYPE_FIXED32

Fixed32 wire type code.

See also:

- Protobuf Encoding

Constant Value: 5 (0x00000005)

### WIRE_TYPE_FIXED64

    public static final int WIRE_TYPE_FIXED64

Fixed64 wire type code.

See also:

- Protobuf Encoding

Constant Value: 1 (0x00000001)

### WIRE_TYPE_LENGTH_DELIMITED

    public static final int WIRE_TYPE_LENGTH_DELIMITED

Length delimited wire type code.

See also:

- Protobuf Encoding

Constant Value: 2 (0x00000002)

### WIRE_TYPE_MASK

    public static final int WIRE_TYPE_MASK

Mask to select the wire type from a tag.

     // Reading a wire type from a tag.
     int wireType = tag & WIRE_TYPE_MASK;

     // Building a tag from a field number and a wire type.
     int tag = (fieldNumber << FIELD_ID_SHIFT) | wireType;

See also:

- Protobuf Encoding

Constant Value: 7 (0x00000007)

### WIRE_TYPE_START_GROUP

    public static final int WIRE_TYPE_START_GROUP

Start group wire type code.

See also:

- Protobuf Encoding

Constant Value: 3 (0x00000003)

### WIRE_TYPE_VARINT

    public static final int WIRE_TYPE_VARINT

Varint wire type code.

See also:

- Protobuf Encoding

Constant Value: 0 (0x00000000)

## Public constructors

### ProtoOutputStream

    public ProtoOutputStream ()

Construct a `ProtoOutputStream` with the default chunk size.

This is for an in-memory proto. The caller should use `getBytes()` for the result.

### ProtoOutputStream

    public ProtoOutputStream (int chunkSize)

Construct a {@link ProtoOutputStream with the given chunk size.

This is for an in-memory proto. The caller should use {@link #getBytes()} for the result.

Parameters
`chunkSize` | `int`

### ProtoOutputStream

    public ProtoOutputStream (OutputStream stream)

Construct a `ProtoOutputStream` that sits on top of an `OutputStream`.

The `flush()` method must be called when done writing to flush any remaining data, although data *may* be written at intermediate points within the writing as well.

Parameters
`stream` | `OutputStream`: This value cannot be `null`.

## Public methods

### checkFieldId

    public static int checkFieldId (long fieldId,
                    long expectedFlags)

Validates that the fieldId provided is of the type and count from expectedType.

The type must match exactly to pass this check.

The count must match according to this truth table to pass the check: expectedFlags UNKNOWN SINGLE REPEATED PACKED fieldId UNKNOWN true false false false SINGLE x true false false REPEATED x false true false PACKED x false true true

Parameters
`fieldId` | `long`
`expectedFlags` | `long`

Returns
`int` | The raw ID of that field.

Throws
`` | java.lang.IllegalArgumentException IllegalArgumentException} if it is not.

### dump

    public void dump (String tag)

Dump debugging data about the buffers with the given log tag.

Parameters
`tag` | `String`: This value cannot be `null`.

### end

    public void end (long token)

End the object started by start() that returned token.

Parameters
`token` | `long`: The token returned from `start(long)`

### flush

    public void flush ()

Write remaining data to the output stream. If there is no output stream, this function does nothing. Any currently open objects (i.e. ones that have not had `end(long)` called for them will not be written). Whether this writes objects that are closed if there are remaining open objects is undefined (current implementation does not write it, future ones will). For now, can either call `getBytes()` or `flush()`, but not both.

### getBytes

    public byte[] getBytes ()

Finish the encoding of the data, and return a byte[] with the protobuf formatted data.

After this call, do not call any of the write* functions. The behavior is undefined.

Returns
`byte[]` | This value cannot be `null`.

### getFieldCountString

    public static String getFieldCountString (long fieldCount)

Get the developer-usable name of a field count.

Parameters
`fieldCount` | `long`

Returns
`String` | This value may be `null`.

### getFieldIdString

    public static String getFieldIdString (long fieldId)

Get a debug string for a fieldId.

Parameters
`fieldId` | `long`

Returns
`String` | This value cannot be `null`.

### getFieldTypeString

    public static String getFieldTypeString (long fieldType)

Get the developer-usable name of a field type.

Parameters
`fieldType` | `long`: Value is android.util.proto.ProtoStream.FIELD_TYPE_UNKNOWN, android.util.proto.ProtoStream.FIELD_TYPE_DOUBLE, android.util.proto.ProtoStream.FIELD_TYPE_FLOAT, android.util.proto.ProtoStream.FIELD_TYPE_INT64, android.util.proto.ProtoStream.FIELD_TYPE_UINT64, android.util.proto.ProtoStream.FIELD_TYPE_INT32, android.util.proto.ProtoStream.FIELD_TYPE_FIXED64, android.util.proto.ProtoStream.FIELD_TYPE_FIXED32, android.util.proto.ProtoStream.FIELD_TYPE_BOOL, android.util.proto.ProtoStream.FIELD_TYPE_STRING, android.util.proto.ProtoStream.FIELD_TYPE_MESSAGE, android.util.proto.ProtoStream.FIELD_TYPE_BYTES, android.util.proto.ProtoStream.FIELD_TYPE_UINT32, android.util.proto.ProtoStream.FIELD_TYPE_ENUM, android.util.proto.ProtoStream.FIELD_TYPE_SFIXED32, android.util.proto.ProtoStream.FIELD_TYPE_SFIXED64, android.util.proto.ProtoStream.FIELD_TYPE_SINT32, or android.util.proto.ProtoStream.FIELD_TYPE_SINT64

Returns
`String` | This value may be `null`.

### getRawSize

    public int getRawSize ()

Returns the total size of the data that has been written, after full protobuf encoding has occurred.

Returns
`int` | the uncompressed buffer size

### getWireTypeString

    public static String getWireTypeString (int wireType)

Get the developer-usable name of a wire type.

Parameters
`wireType` | `int`: Value is android.util.proto.ProtoStream.WIRE_TYPE_VARINT, android.util.proto.ProtoStream.WIRE_TYPE_FIXED64, android.util.proto.ProtoStream.WIRE_TYPE_LENGTH_DELIMITED, android.util.proto.ProtoStream.WIRE_TYPE_START_GROUP, android.util.proto.ProtoStream.WIRE_TYPE_END_GROUP, or android.util.proto.ProtoStream.WIRE_TYPE_FIXED32

Returns
`String` | This value may be `null`.

### makeFieldId

    public static long makeFieldId (int id,
                    long fieldFlags)

Combine a fieldId (the field keys in the proto file) and the field flags. Mostly useful for testing because the generated code contains the fieldId constants.

Parameters
`id` | `int`
`fieldFlags` | `long`

Returns
`long` |

### makeToken

    public static long makeToken (int tagSize,
                    boolean repeated,
                    int depth,
                    int objectId,
                    int offset)

Make a token. Bits 61-63 - tag size (So we can go backwards later if the object had not data) - 3 bits, max value 7, max value needed 5 Bit 60 - true if the object is repeated (lets us require endObject or endRepeatedObject) Bits 59-51 - depth (For error checking) - 9 bits, max value 512, when checking, value is masked (if we really are more than 512 levels deep) Bits 32-50 - objectId (For error checking) - 19 bits, max value 524,288. that's a lot of objects. IDs will wrap because of the overflow, and only the tokens are compared. Bits 0-31 - offset of interest for the object.

Parameters
`tagSize` | `int`
`repeated` | `boolean`
`depth` | `int`
`objectId` | `int`
`offset` | `int`

Returns
`long` |

### start

    public long start (long fieldId)

Start a sub object.

Parameters
`fieldId` | `long`: The field identifier constant from the generated class.

Returns
`long` | The token to call `end(long)` with.

### token2String

    public static String token2String (long token)

Return a debugging string of a token.

Parameters
`token` | `long`

Returns
`String` | This value cannot be `null`.

### write

    public void write (long fieldId,
                    String val)

Write a string value for the given fieldId.

If the field is not a string field, an exception will be thrown.

Parameters
`fieldId` | `long`: The field identifier constant from the generated class.
`val` | `String`: The value. This value may be `null`.

### write

    public void write (long fieldId,
                    boolean val)

Write a boolean value for the given fieldId.

If the field is not a bool field, an `IllegalStateException` will be thrown.

Parameters
`fieldId` | `long`: The field identifier constant from the generated class.
`val` | `boolean`: The value.

### write

    public void write (long fieldId,
                    int val)

Write a value for the given fieldId.

Will automatically convert for the following field types, and throw an exception for others: double, float, int32, int64, uint32, uint64, sint32, sint64, fixed32, fixed64, sfixed32, sfixed64, bool, enum.

Parameters
`fieldId` | `long`: The field identifier constant from the generated class.
`val` | `int`: The value.

### write

    public void write (long fieldId,
                    float val)

Write a value for the given fieldId.

Will automatically convert for the following field types, and throw an exception for others: double, float, int32, int64, uint32, uint64, sint32, sint64, fixed32, fixed64, sfixed32, sfixed64, bool, enum.

Parameters
`fieldId` | `long`: The field identifier constant from the generated class.
`val` | `float`: The value.

### write

    public void write (long fieldId,
                    long val)

Write a value for the given fieldId.

Will automatically convert for the following field types, and throw an exception for others: double, float, int32, int64, uint32, uint64, sint32, sint64, fixed32, fixed64, sfixed32, sfixed64, bool, enum.

Parameters
`fieldId` | `long`: The field identifier constant from the generated class.
`val` | `long`: The value.

### write

    public void write (long fieldId,
                    double val)

Write a value for the given fieldId.

Will automatically convert for the following field types, and throw an exception for others: double, float, int32, int64, uint32, uint64, sint32, sint64, fixed32, fixed64, sfixed32, sfixed64, bool, enum.

Parameters
`fieldId` | `long`: The field identifier constant from the generated class.
`val` | `double`: The value.

### write

    public void write (long fieldId,
                    byte[] val)

Write a byte[] value for the given fieldId.

If the field is not a bytes or object field, an exception will be thrown.

Parameters
`fieldId` | `long`: The field identifier constant from the generated class.
`val` | `byte`: The value. This value may be `null`.

### writeTag

    public void writeTag (int id,
                    int wireType)

Write an individual field tag by hand. See Protobuf Encoding for details on the structure of how tags and data are written.

Parameters
`id` | `int`
`wireType` | `int`: Value is android.util.proto.ProtoStream.WIRE_TYPE_VARINT, android.util.proto.ProtoStream.WIRE_TYPE_FIXED64, android.util.proto.ProtoStream.WIRE_TYPE_LENGTH_DELIMITED, android.util.proto.ProtoStream.WIRE_TYPE_START_GROUP, android.util.proto.ProtoStream.WIRE_TYPE_END_GROUP, or android.util.proto.ProtoStream.WIRE_TYPE_FIXED32

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