Lossless Video Cutter の LicenseActivity の実装

activity_license.xml

<?xml version="1.0" encoding="utf-8"?>
<ScrollView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="8dp"
    >

    <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/text"
            android:textIsSelectable="true"
            android:layout_margin="@dimen/padding_medium"
    />
</ScrollView>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">

...

    <application>
...
        <activity
                android:name=".LicenseActivity"
                android:label="@string/open_source_libraries"
        />

...

</manifest>

assets license ExoPlayer

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

LicenseActivity.kt

package jp.takke.videocutter

import android.annotation.SuppressLint
import android.graphics.Typeface
import android.os.Bundle
import android.text.Spannable
import android.text.SpannableStringBuilder
import android.text.style.RelativeSizeSpan
import android.text.style.StyleSpan
import androidx.appcompat.app.AppCompatActivity
import jp.takke.videocutter.databinding.ActivityLicenseBinding
import java.io.BufferedReader
import java.io.InputStreamReader

class LicenseActivity : AppCompatActivity() {

    private lateinit var binding: ActivityLicenseBinding

    @SuppressLint("SetTextI18n")
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        //--------------------------------------------------
        // ViewBinding初期化
        //--------------------------------------------------
        binding = ActivityLicenseBinding.inflate(layoutInflater)
        setContentView(binding.root)

        binding.text.text = SpannableStringBuilder().apply {

            addLicenseItem(this, "Android About Page", "AndroidAboutPage")
            addLicenseItem(this, "Java MP4 Parser", "mp4parser")
            addLicenseItem(this, "ExoPlayer", "ExoPlayer")
            addLicenseItem(this, "Crystal Range Seekbar", "CrystalRangeSeekbar")
            addLicenseItem(this, "PermissionsDispatcher", "PermissionsDispatcher")

        }
    }

    private fun addLicenseItem(ssb: SpannableStringBuilder, title: String, licenseFileName: String) {
        val start = ssb.length
        ssb.append(title)
        ssb.setSpan(StyleSpan(Typeface.BOLD), start, ssb.length, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
        ssb.setSpan(RelativeSizeSpan(1.2f), start, ssb.length, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)

        ssb.append("\n\n")
        ssb.append(readLicenseFile(licenseFileName))
        ssb.append("\n\n")
    }

    private fun readLicenseFile(licenseFileName: String): String {

        BufferedReader(InputStreamReader(assets.open("license/$licenseFileName"))).use {

            return it.readText()
        }
    }
}

実行結果