Add image download functionality from WebView
This commit is contained in:
Alex Abudaev
parent
1b409ea9a7
commit
6b940730f4
2 changed files with 166 additions and 1 deletions
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@ -2,6 +2,8 @@
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<manifest xmlns:android="http://schemas.android.com/apk/res/android">
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<uses-permission android:name="android.permission.INTERNET" />
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<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" android:maxSdkVersion="28" />
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<uses-permission android:name="android.permission.READ_MEDIA_IMAGES" />
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<application
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android:allowBackup="true"
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@ -13,7 +13,12 @@ import android.webkit.ValueCallback
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import android.webkit.WebChromeClient
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import android.webkit.WebView
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import android.webkit.WebViewClient
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import android.webkit.DownloadListener
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import android.widget.Toast
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import android.os.Environment
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import android.app.DownloadManager
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import android.provider.Settings
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import java.io.File as IoFile
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import androidx.activity.result.contract.ActivityResultContracts
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import androidx.appcompat.app.AppCompatActivity
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import androidx.core.content.ContextCompat
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@ -73,7 +78,65 @@ class MainActivity : AppCompatActivity() {
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CookieManager.getInstance().setAcceptCookie(true)
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CookieManager.getInstance().setAcceptThirdPartyCookies(webView, true)
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webView.addJavascriptInterface(object {
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@android.webkit.JavascriptInterface
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fun downloadImage(url: String) {
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runOnUiThread {
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if (!url.startsWith("http://") && !url.startsWith("https://")) {
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return@runOnUiThread
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}
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val fileName = android.webkit.URLUtil.guessFileName(url, null, null) ?: "image_${System.currentTimeMillis()}.png"
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val downloadManager = getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager
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val downloadRequest = DownloadManager.Request(Uri.parse(url)).apply {
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setMimeType("image/png")
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setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED)
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setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName)
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}
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downloadManager.enqueue(downloadRequest)
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Toast.makeText(this@MainActivity, "Downloading...", Toast.LENGTH_SHORT).show()
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}
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}
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@android.webkit.JavascriptInterface
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fun downloadBase64Image(base64Data: String) {
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runOnUiThread {
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try {
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val base64 = base64Data.substringAfter("base64,")
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val imageBytes = android.util.Base64.decode(base64, android.util.Base64.DEFAULT)
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val fileName = "duckai_image_${System.currentTimeMillis()}.jpg"
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val contentValues = android.content.ContentValues().apply {
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put(android.provider.MediaStore.Downloads.DISPLAY_NAME, fileName)
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put(android.provider.MediaStore.Downloads.MIME_TYPE, "image/jpeg")
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put(android.provider.MediaStore.Downloads.IS_PENDING, 1)
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}
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val resolver = contentResolver
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val uri = resolver.insert(android.provider.MediaStore.Downloads.EXTERNAL_CONTENT_URI, contentValues)
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if (uri != null) {
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resolver.openOutputStream(uri)?.use { outputStream ->
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outputStream.write(imageBytes)
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}
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contentValues.clear()
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contentValues.put(android.provider.MediaStore.Downloads.IS_PENDING, 0)
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resolver.update(uri, contentValues, null, null)
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Toast.makeText(this@MainActivity, "Файл сохранён в папке «Загрузки» (Downloads)\n$fileName", Toast.LENGTH_LONG).show()
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} else {
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Toast.makeText(this@MainActivity, "Download failed", Toast.LENGTH_SHORT).show()
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}
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} catch (e: Exception) {
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Toast.makeText(this@MainActivity, "Ошибка сохранения: ${e.message}", Toast.LENGTH_SHORT).show()
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}
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}
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}
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}, "Android")
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webView.webChromeClient = object : WebChromeClient() {
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override fun onConsoleMessage(message: String?, lineNumber: Int, sourceID: String?) {
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message?.let { android.util.Log.d("DuckAI", it) }
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}
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override fun onShowFileChooser(
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webView: WebView?,
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filePathCallback: ValueCallback<Array<Uri>>?,
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@ -88,6 +151,26 @@ class MainActivity : AppCompatActivity() {
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webView.webViewClient = object : WebViewClient() {
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override fun onPageFinished(view: WebView?, url: String?) {
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view?.postDelayed({ tryFocusInput(view) }, 2000)
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view?.postDelayed({ injectDownloadHandler(view) }, 1500)
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}
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}
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webView.setDownloadListener { url, userAgent, contentDisposition, mimeType, contentLength ->
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if (url.startsWith("blob:") || url.startsWith("data:")) {
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return@setDownloadListener
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} else if (!url.startsWith("http://") && !url.startsWith("https://")) {
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return@setDownloadListener
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} else {
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val fileName = android.webkit.URLUtil.guessFileName(url, contentDisposition, mimeType) ?: "download"
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val downloadManager = getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager
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val downloadRequest = DownloadManager.Request(Uri.parse(url)).apply {
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setMimeType(mimeType)
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setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED)
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setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName)
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}
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downloadManager.enqueue(downloadRequest)
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Toast.makeText(this, "Downloading...", Toast.LENGTH_SHORT).show()
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}
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}
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}
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@ -133,13 +216,84 @@ class MainActivity : AppCompatActivity() {
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" return 'NOT FOUND';" +
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"})();"
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) { result ->
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android.util.Log.d("DuckAI", "Focus result: " + result)
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if (result?.contains("NOT FOUND") == true) {
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view?.postDelayed({ tryFocusInput(view) }, 1000)
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}
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}
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}
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private fun injectDownloadHandler(view: WebView?) {
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view?.evaluateJavascript(
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"(function() {" +
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" if (window.downloadHandlerInjected) return;" +
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" window.downloadHandlerInjected = true;" +
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" " +
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" function downloadBlobImage(src) {" +
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" fetch(src)" +
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" .then(res => res.blob())" +
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" .then(blob => {" +
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" const reader = new FileReader();" +
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" reader.onloadend = function() {" +
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" const base64 = reader.result.split(',')[1];" +
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" const link = document.createElement('a');" +
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" link.href = 'data:image/png;base64,' + base64;" +
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" link.download = 'duckai_image_' + Date.now() + '.png';" +
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" link.click();" +
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" };" +
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" reader.readAsDataURL(blob);" +
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" })" +
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" }" +
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" " +
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" function findImageSrc(btn) {" +
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" let el = btn;" +
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" for (let i = 0; i < 5 && el; i++) {" +
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" const img = el.querySelector('img');" +
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" if (img && img.src) return img.src;" +
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" const sources = el.querySelectorAll('source');" +
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" for (let s of sources) {" +
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" if (s.src && s.src.startsWith('blob:')) return s.src;" +
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" }" +
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" el = el.parentElement;" +
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" }" +
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" const allImgs = document.querySelectorAll('img');" +
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" for (let img of allImgs) {" +
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" if (img.src.startsWith('blob:')) return img.src;" +
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" }" +
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" return null;" +
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" }" +
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" " +
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" document.body.addEventListener('click', function(e) {" +
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" const target = e.target;" +
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" const btn = target.closest('button');" +
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" if (!btn) return;" +
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" " +
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" const svg = btn.querySelector('svg');" +
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" if (!svg) return;" +
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" " +
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" const path = svg.querySelector('path');" +
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" if (!path || !path.getAttribute('d')) return;" +
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" " +
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" const d = path.getAttribute('d');" +
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" " +
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" if (d.includes('M8 .5') || d.includes('8.264')) {" +
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" e.preventDefault();" +
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" e.stopPropagation();" +
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" " +
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" const imgSrc = findImageSrc(btn);" +
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" if (!imgSrc) return;" +
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" " +
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" if (imgSrc.startsWith('data:')) {" +
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" window.Android && window.Android.downloadBase64Image && window.Android.downloadBase64Image(imgSrc);" +
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" } else if (imgSrc.startsWith('blob:')) {" +
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" downloadBlobImage(imgSrc);" +
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" } else if (imgSrc.startsWith('http')) {" +
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" window.Android && window.Android.downloadImage && window.Android.downloadImage(imgSrc);" +
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" }" +
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" }" +
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" }, true);" +
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"})();" , null)
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}
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private fun checkPermissionAndOpenPicker() {
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
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openFilePicker()
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@ -197,6 +351,9 @@ class MainActivity : AppCompatActivity() {
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window.decorView.postDelayed({
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requestFocusAndShowKeyboard()
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}, 1200)
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webView.postDelayed({
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injectDownloadHandler(webView)
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}, 2000)
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}
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private fun requestFocusAndShowKeyboard() {
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@ -233,6 +390,9 @@ override fun onResume() {
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tryFocusInput(webView)
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showKeyboard()
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}, 1500)
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webView.postDelayed({
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injectDownloadHandler(webView)
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}, 2000)
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}
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override fun onNewIntent(intent: Intent?) {
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@ -246,6 +406,9 @@ override fun onResume() {
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webView.postDelayed({
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requestFocusAndShowKeyboard()
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}, 1200)
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webView.postDelayed({
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injectDownloadHandler(webView)
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}, 2000)
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}
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}
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