Question

我刚刚将图像保存到：App.getContext().filesDir

现在，我想像这样将html中的图像加载到Webview：

<img src="/data/user/0/com.asd.myappname/files/MyAppName/htmlimgs/first.jpg" />

图像像这里一样破裂。为什么？

但是img在文件夹中...

Answer 1

您可以编写此代码并尝试

web.getSettings().setDomStorageEnabled(true);

OR：

获取图像的位图并将其转换为base64编码的图像，然后将其显示为WebView，

Bitmap bitmap = BitmapFactory.decodeFile("/data/user/0/com.asd.myappname/files/MyAppName/htmlimgs/first.jpg");

ImageView imgView = (ImageView) this.findViewById(R.id.imgViewId);

imgView.setImageBitmap(bitmap);

// Desired Bitmap and the html code, where you want to place it
 Bitmap bitmap = YOUR_BITMAP;
 String html="<html><body><img src='{IMAGE_PLACEHOLDER}' /></body>  </html>";

// Convert bitmap to Base64 encoded image for web

ByteArrayOutputStream byteArrayOutputStream = new  ByteArrayOutputStream();
 bitmap.compress(Bitmap.CompressFormat.PNG, 100, byteArrayOutputStream);
 byte[] byteArray = byteArrayOutputStream.toByteArray();
 String imgageBase64 = Base64.encodeToString(byteArray, Base64.DEFAULT);
 String image = "data:image/png;base64," + imgageBase64;

// Use image for the img src parameter in your html and load to webview
html = html.replace("{IMAGE_PLACEHOLDER}", image);
webview.loadDataWithBaseURL("file:///android_asset/", html, "text/html", "utf-8", "");

尝试一下。

Answer 2

在kotlin中尝试此代码（来自Sana答案）

您可以编写此代码并尝试，

web.getSettings().setDomStorageEnabled(true)

（OR）

val bitmap = BitmapFactory.decodeFile("/data/user/0/com.asd.myappname/files/MyAppName/htmlimgs/first.jpg")
val imgView = this.findViewById(R.id.imgViewId) as ImageView
imgView.setImageBitmap(bitmap)
val bitmap = YOUR_BITMAP
val html = "<html><body><img src='{IMAGE_PLACEHOLDER}' /></body> </html>"
val byteArrayOutputStream = ByteArrayOutputStream()
bitmap.compress(Bitmap.CompressFormat.PNG, 100, byteArrayOutputStream)
val byteArray = byteArrayOutputStream.toByteArray()
val imgageBase64 = Base64.encodeToString(byteArray, Base64.DEFAULT)
val image = "data:image/png;base64," + imgageBase64
html = html.replace("{IMAGE_PLACEHOLDER}", image)
webview.loadDataWithBaseURL("file:///android_asset/", html, "text/html", "utf-8", "")

Android从应用程序数据目录在WebView中显示img

2 个答案: