54 lines
2.2 KiB
Kotlin
54 lines
2.2 KiB
Kotlin
package be.mygod.vpnhotspot.util
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import android.graphics.Bitmap
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import android.graphics.Color
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import android.os.Bundle
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import android.view.LayoutInflater
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import android.view.ViewGroup
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import android.widget.ImageView
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import android.widget.Toast
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import androidx.core.os.bundleOf
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import androidx.fragment.app.DialogFragment
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import be.mygod.vpnhotspot.R
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import com.google.zxing.BarcodeFormat
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import com.google.zxing.EncodeHintType
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import com.google.zxing.MultiFormatWriter
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import com.google.zxing.WriterException
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import timber.log.Timber
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import java.nio.charset.StandardCharsets
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class QRCodeDialog : DialogFragment() {
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companion object {
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private const val KEY_ARG = "arg"
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private val iso88591 = StandardCharsets.ISO_8859_1.newEncoder()
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}
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fun withArg(arg: String) = apply { arguments = bundleOf(KEY_ARG to arg) }
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private val arg get() = arguments?.getString(KEY_ARG)
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/**
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* Based on:
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* https://android.googlesource.com/platform/packages/apps/Settings/+/0d706f0/src/com/android/settings/wifi/qrcode/QrCodeGenerator.java
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* https://android.googlesource.com/platform/packages/apps/Settings/+/8a9ccfd/src/com/android/settings/wifi/dpp/WifiDppQrCodeGeneratorFragment.java#153
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*/
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override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?) = try {
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val size = resources.getDimensionPixelSize(R.dimen.qrcode_size)
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val hints = mutableMapOf<EncodeHintType, Any>()
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if (!iso88591.canEncode(arg)) hints[EncodeHintType.CHARACTER_SET] = StandardCharsets.UTF_8.name()
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val qrBits = MultiFormatWriter().encode(arg, BarcodeFormat.QR_CODE, size, size, hints)
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ImageView(context).apply {
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layoutParams = ViewGroup.LayoutParams(size, size)
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setImageBitmap(Bitmap.createBitmap(size, size, Bitmap.Config.RGB_565).apply {
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for (x in 0 until size) for (y in 0 until size) {
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setPixel(x, y, if (qrBits.get(x, y)) Color.BLACK else Color.WHITE)
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}
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})
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}
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} catch (e: WriterException) {
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Timber.w(e)
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Toast.makeText(context, e.readableMessage, Toast.LENGTH_LONG).show()
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dismiss()
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null
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}
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}
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