android.os.Parcel.dataPosition()方法的使用及代码示例

x33g5p2x  于2022-01-25 转载在 其他  
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本文整理了Java中android.os.Parcel.dataPosition()方法的一些代码示例，展示了Parcel.dataPosition()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Parcel.dataPosition()方法的具体详情如下：
包路径：android.os.Parcel
类名称：Parcel
方法名：dataPosition

Parcel.dataPosition介绍

[英]Returns the current position in the parcel data. Never more than #dataSize.
[中]返回地块数据中的当前位置。永远不要超过#数据大小。

代码示例

代码示例来源：origin: k9mail/k-9

public OpenPgpError createFromParcel(final Parcel source) {
  source.readInt(); // parcelableVersion
  int parcelableSize = source.readInt();
  int startPosition = source.dataPosition();
  OpenPgpError error = new OpenPgpError();
  error.errorId = source.readInt();
  error.message = source.readString();
  // skip over all fields added in future versions of this parcel
  source.setDataPosition(startPosition + parcelableSize);
  return error;
}

代码示例来源：origin: k9mail/k-9

public OpenPgpMetadata createFromParcel(final Parcel source) {
  int version = source.readInt(); // parcelableVersion
  int parcelableSize = source.readInt();
  int startPosition = source.dataPosition();
  OpenPgpMetadata vr = new OpenPgpMetadata();
  vr.filename = source.readString();
  vr.mimeType = source.readString();
  vr.modificationTime = source.readLong();
  vr.originalSize = source.readLong();
  if (version >= 2) {
    vr.charset = source.readString();
  }
  // skip over all fields added in future versions of this parcel
  source.setDataPosition(startPosition + parcelableSize);
  return vr;
}

代码示例来源：origin: k9mail/k-9

public AutocryptPeerUpdate createFromParcel(final Parcel source) {
  int version = source.readInt(); // parcelableVersion
  int parcelableSize = source.readInt();
  int startPosition = source.dataPosition();
  AutocryptPeerUpdate vr = new AutocryptPeerUpdate(source, version);
  // skip over all fields added in future versions of this parcel
  source.setDataPosition(startPosition + parcelableSize);
  return vr;
}

代码示例来源：origin: k9mail/k-9

public OpenPgpSignatureResult createFromParcel(final Parcel source) {
  int version = source.readInt(); // parcelableVersion
  int parcelableSize = source.readInt();
  int startPosition = source.dataPosition();
  OpenPgpSignatureResult vr = new OpenPgpSignatureResult(source, version);
  // skip over all fields added in future versions of this parcel
  source.setDataPosition(startPosition + parcelableSize);
  return vr;
}

代码示例来源：origin: k9mail/k-9

public OpenPgpDecryptionResult createFromParcel(final Parcel source) {
  int version = source.readInt(); // parcelableVersion
  int parcelableSize = source.readInt();
  int startPosition = source.dataPosition();
  int result = source.readInt();
  byte[] sessionKey = version > 1 ? source.createByteArray() : null;
  byte[] decryptedSessionKey = version > 1 ? source.createByteArray() : null;
  OpenPgpDecryptionResult vr = new OpenPgpDecryptionResult(result, sessionKey, decryptedSessionKey);
  // skip over all fields added in future versions of this parcel
  source.setDataPosition(startPosition + parcelableSize);
  return vr;
}

代码示例来源：origin: robolectric/robolectric

@Test
public void testDataPositionAfterSomeWrites() {
 parcel.writeInt(1);
 assertThat(parcel.dataPosition()).isEqualTo(4);
 parcel.writeFloat(5);
 assertThat(parcel.dataPosition()).isEqualTo(8);
 parcel.writeDouble(37);
 assertThat(parcel.dataPosition()).isEqualTo(16);
 parcel.writeStrongBinder(new Binder()); // 20 bytes
 assertThat(parcel.dataPosition()).isEqualTo(36);
}

代码示例来源：origin: robolectric/robolectric

@Test
public void testWriteNullString() {
 parcel.writeString(null);
 parcel.setDataPosition(0);
 assertThat(parcel.readString()).isNull();
 assertThat(parcel.dataPosition()).isEqualTo(4);
}

代码示例来源：origin: robolectric/robolectric

@Test
public void testSetDataPositionToEmptyString() {
 parcel.writeString("");
 parcel.setDataPosition(parcel.dataPosition());
 parcel.writeString("something else");
 parcel.setDataPosition(0);
 assertThat(parcel.readString()).isEmpty();
}

代码示例来源：origin: robolectric/robolectric

@Test
public void testReadIntWhenEmpty() {
 assertThat(parcel.readInt()).isEqualTo(0);
 assertThat(parcel.dataPosition()).isEqualTo(0);
 assertInvariants();
}

代码示例来源：origin: robolectric/robolectric

@Test
public void testReadLongWhenEmpty() {
 assertThat(parcel.readLong()).isEqualTo(0);
 assertThat(parcel.dataPosition()).isEqualTo(0);
 assertInvariants();
}

代码示例来源：origin: robolectric/robolectric

@Test
public void testDataPositionAfterSomeReads() {
 parcel.writeInt(1);
 parcel.writeFloat(5);
 parcel.writeDouble(37);
 parcel.setDataPosition(0);
 parcel.readInt();
 assertThat(parcel.dataPosition()).isEqualTo(4);
 parcel.readFloat();
 assertThat(parcel.dataPosition()).isEqualTo(8);
 parcel.readDouble();
 assertThat(parcel.dataPosition()).isEqualTo(16);
}

代码示例来源：origin: robolectric/robolectric

@Test
public void testByteArrayOfZeroesReadAsZeroes() {
 parcel.writeByteArray(new byte[15]);
 assertThat(parcel.dataSize()).isEqualTo(20);
 parcel.setDataPosition(0);
 assertThat(parcel.readInt()).isEqualTo(15);
 assertThat(parcel.readLong()).isEqualTo(0);
 assertThat(parcel.readLong()).isEqualTo(0);
 assertThat(parcel.dataPosition()).isEqualTo(20);
}

代码示例来源：origin: robolectric/robolectric

@Test
public void testUnmarshallEmpty() throws IOException {
 // Unmarshall an zero-length byte string, although, pass a non-empty array to make sure the
 // length/offset are respected.
 parcel.unmarshall(new byte[] {1, 2, 3}, 1, 0);
 assertThat(parcel.dataSize()).isEqualTo(0);
 assertThat(parcel.dataPosition()).isEqualTo(0);
 // Should not throw "Did you forget to setDataPosition(0)?" because it's still empty.
 assertThat(parcel.readInt()).isEqualTo(0);
}

代码示例来源：origin: robolectric/robolectric

@Test
public void testZeroCanBeCasted_8ByteTypesCanBeReadAs4Bytes() {
 parcel.writeLong(0);
 parcel.writeDouble(0.0);
 parcel.writeLong(0);
 assertThat(parcel.dataSize()).named("total size").isEqualTo(24);
 parcel.setDataPosition(0);
 assertThat(parcel.readInt()).isEqualTo(0);
 assertThat(parcel.readFloat()).isEqualTo(0.0f);
 assertThat(parcel.createByteArray()).isEqualTo(new byte[0]);
 assertThat(parcel.dataPosition()).isEqualTo(12);
 assertThat(parcel.readInt()).isEqualTo(0);
 assertThat(parcel.readFloat()).isEqualTo(0.0f);
 assertThat(parcel.createByteArray()).isEqualTo(new byte[0]);
 assertThat(parcel.dataPosition()).isEqualTo(24);
}

代码示例来源：origin: robolectric/robolectric

@Test
public void testFullyOverwritten() {
 parcel.writeInt(1);
 // NOTE: Later, this 8-byte long gets chopped up by two 4-byte writes, but it's OK because this
 // byte range is not read until it has been fully overwritten.
 parcel.writeLong(5);
 parcel.writeInt(4);
 assertInvariants();
 parcel.setDataPosition(4);
 parcel.writeByte((byte) 55); // Byte and int have the parceled size.
 parcel.writeString(null); // And so does a null string.
 assertInvariants();
 parcel.setDataPosition(0);
 assertThat(parcel.readInt()).named("readInt@0").isEqualTo(1);
 assertThat(parcel.dataPosition()).named("position post-readInt@0").isEqualTo(4);
 assertThat(parcel.readByte()).named("readByte@4").isEqualTo(55);
 assertThat(parcel.dataPosition()).named("position post-readByte@4").isEqualTo(8);
 assertThat(parcel.readString()).named("readString@8").isNull();
 assertThat(parcel.dataPosition()).named("position post-readString@8").isEqualTo(12);
 assertThat(parcel.readInt()).named("readInt@12").isEqualTo(4);
}

代码示例来源：origin: robolectric/robolectric

@Test
public void testZeroCanBeCasted_4ByteTypesCanBeReadAs8Bytes() {
 parcel.writeByte((byte) 0);
 parcel.writeByte((byte) 0);
 parcel.writeInt(0);
 parcel.writeInt(0);
 parcel.writeFloat(0.0f);
 parcel.writeByteArray(new byte[0]);
 assertThat(parcel.dataSize()).named("total size").isEqualTo(24);
 parcel.setDataPosition(0);
 assertThat(parcel.readLong()).isEqualTo(0L);
 assertWithMessage("long consumes 8B").that(parcel.dataPosition()).isEqualTo(8);
 assertThat(parcel.readDouble()).isEqualTo(0.0);
 assertWithMessage("double consumes 8B").that(parcel.dataPosition()).isEqualTo(16);
 assertThat(parcel.readString()).isEqualTo("");
 assertWithMessage("empty string 8B").that(parcel.dataPosition()).isEqualTo(24);
}

代码示例来源：origin: robolectric/robolectric

@Test
public void testReadWriteNumbers() {
 parcel.writeInt(Integer.MIN_VALUE);
 assertThat(parcel.dataSize()).isEqualTo(4);
 parcel.writeLong(Long.MAX_VALUE);
 assertThat(parcel.dataSize()).isEqualTo(12);
 double d = 3.14159;
 parcel.writeDouble(d);
 assertThat(parcel.dataSize()).isEqualTo(20);
 float f = -6.022e23f;
 parcel.writeFloat(f);
 assertThat(parcel.dataSize()).isEqualTo(24);
 assertInvariants();
 parcel.setDataPosition(0);
 assertThat(parcel.readInt()).isEqualTo(Integer.MIN_VALUE);
 assertThat(parcel.dataPosition()).isEqualTo(4);
 assertThat(parcel.readLong()).isEqualTo(Long.MAX_VALUE);
 assertThat(parcel.dataPosition()).isEqualTo(12);
 assertThat(parcel.readDouble()).isEqualTo(d);
 assertThat(parcel.dataPosition()).isEqualTo(20);
 assertThat(parcel.readFloat()).isEqualTo(f);
 assertThat(parcel.dataPosition()).isEqualTo(24);
 assertWithMessage("read past end is valid").that(parcel.readInt()).isEqualTo(0);
 assertThat(parcel.dataPosition()).isEqualTo(24);
 assertInvariants();
}

代码示例来源：origin: robolectric/robolectric

@Test
public void testMarshallAndUnmarshall() {
 parcel.writeInt(1);
 parcel.writeString("hello");
 parcel.writeDouble(25.0);
 parcel.writeFloat(1.25f);
 parcel.writeByte((byte) 0xAF);
 int oldSize = parcel.dataSize();
 parcel.setDataPosition(7);
 byte[] rawBytes = parcel.marshall();
 assertWithMessage("data position preserved").that(parcel.dataPosition()).isEqualTo(7);
 Parcel parcel2 = Parcel.obtain();
 assertInvariants(parcel2);
 parcel2.unmarshall(rawBytes, 0, rawBytes.length);
 assertThat(parcel2.dataPosition()).isEqualTo(parcel2.dataSize());
 parcel2.setDataPosition(0);
 assertThat(parcel2.dataSize()).isEqualTo(oldSize);
 assertThat(parcel2.readInt()).isEqualTo(1);
 assertThat(parcel2.readString()).isEqualTo("hello");
 assertThat(parcel2.readDouble()).isEqualTo(25.0);
 assertThat(parcel2.readFloat()).isEqualTo(1.25f);
 assertThat(parcel2.readByte()).isEqualTo((byte) 0xAF);
}

代码示例来源：origin: robolectric/robolectric

@Test
public void testSetDataSize() {
 parcel.writeInt(1);
 parcel.writeInt(2);
 parcel.writeInt(3);
 parcel.writeInt(4);
 parcel.writeInt(5);
 assertThat(parcel.dataSize()).isEqualTo(20);
 assertInvariants();
 int oldCapacity = parcel.dataCapacity();
 parcel.setDataSize(12);
 assertWithMessage("should equal requested size").that(parcel.dataSize()).isEqualTo(12);
 assertWithMessage("position gets truncated").that(parcel.dataPosition()).isEqualTo(12);
 assertWithMessage("capacity doesn't shrink").that(parcel.dataCapacity()).isEqualTo(oldCapacity);
 parcel.setDataSize(100);
 assertWithMessage("should equal requested size").that(parcel.dataSize()).isEqualTo(100);
 assertWithMessage("position untouched").that(parcel.dataPosition()).isEqualTo(12);
 assertInvariants();
}

代码示例来源：origin: robolectric/robolectric

private void assertInvariants(Parcel p) {
  assertWithMessage("capacity >= size").that(p.dataCapacity()).isAtLeast(p.dataSize());
  assertWithMessage("position <= size").that(p.dataPosition()).isAtMost(p.dataSize());
  assertWithMessage("available = size - position")
    .that(p.dataAvail())
    .isEqualTo(p.dataSize() - p.dataPosition());
  assertWithMessage("size % 4 == 0").that(p.dataSize() % 4).isEqualTo(0);
  assertWithMessage("capacity % 4 == 0").that(p.dataSize() % 4).isEqualTo(0);
 }
}

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