Y.A.M の雑記帳

2021年4月2日金曜日

Compose メモ : baseline を基準とした余白


Modifier
    .paddingFromBaseline(top = 24.dp, bottom = 16.dp)

2021年3月29日月曜日

改行を入力させない EditText 用 InputFilter


class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val editText = findViewById<EditText>(R.id.editText)
        editText.filters = editText.filters + MyInputFilter()
    }
}

class MyInputFilter : InputFilter {

    override fun filter(
        source: CharSequence,
        start: Int,
        end: Int,
        dest: Spanned,
        dstart: Int,
        dend: Int
    ): CharSequence? {

        var i: Int = start
        while (i < end) {
            if (source[i] == '\n') {
                break
            }
            i++
        }

        if (i == end) {
            return null
        }

        val filtered = SpannableStringBuilder(source, start, end)
        val start2 = i - start
        val end2 = end - start

        for (j in end2 - 1 downTo start2) {
            if (source[j] == '\n') {
                filtered.delete(j, j + 1)
            }
        }

        return filtered
    }
}

2021年3月23日火曜日

Kotlin Serialization は sealed class も対応していて便利

Kotlin Serialization


plugins {
    ...
    id "org.jetbrains.kotlin.plugin.serialization" version "1.4.31"
}

dependencies {
    ...
    implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:1.1.0"
}


@Serializable
data class Dog(val name: String, val age: Int, val sex: Sex, val kind: Kind)

enum class Sex {
    MALE,
    FEMALE
}

@Serializable
sealed class Kind {

    @Serializable
    object Hybrid : Kind()

    @Serializable
    data class PureBlood(val name: String) : Kind()
}


class DogTest {

    @Test
    fun list() {
        val dogs = listOf(
            Dog("White", 10, Sex.MALE, Kind.Hybrid),
            Dog("Black", 20, Sex.FEMALE, Kind.PureBlood("Husky"))
        )

        val json = Json.encodeToString(dogs)
        println(json)
        // [{"name":"White","age":10,"sex":"MALE","kind":{"type":"net.yanzm.serialize.Kind.Hybrid"}},{"name":"Black","age":20,"sex":"FEMALE","kind":{"type":"net.yanzm.serialize.Kind.PureBlood","name":"Husky"}}]


        val decoded = Json.decodeFromString<List<Dog>>(json)

        assertThat(decoded).isEqualTo(dogs)
    }
}