如何将图像转换为字节数组和字节数组为base64在android中的string？
有人可以告诉我的代码转换成字节数组的图像和字节数组到base64string。 我写下面的代码没有得到正确的结果。
String filepath = "/sdcard/Image/ic_launcher.jpg"; File imagefile = new File(filepath); FileInputStream fis = null; try { fis = new FileInputStream(imagefile); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } Bitmap bm = BitmapFactory.decodeStream(fis); ByteArrayOutputStream baos = new ByteArrayOutputStream(); bm.compress(Bitmap.CompressFormat.JPEG, 100 , baos); byte[] b = baos.toByteArray(); String encodedImage = Base64.encodeToString(b, Base64.DEFAULT); 结果我得到的是
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-82, -10... and at end of this byte array im getting this 3 dots and array is not completed ,so how can i get correct byte array
base64string是
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尝试这个：
// convert from bitmap to byte array public byte[] getBytesFromBitmap(Bitmap bitmap) { ByteArrayOutputStream stream = new ByteArrayOutputStream(); bitmap.compress(CompressFormat.JPEG, 70, stream); return stream.toByteArray(); } // get the base 64 string String imgString = Base64.encodeToString(getBytesFromBitmap(someImg), Base64.NO_WRAP);
我写了下面的代码将SD卡中的图像转换为Base64编码的string，作为JSON对象发送。
String filepath = "/sdcard/temp.png"; File imagefile = new File(filepath); FileInputStream fis = null; try { fis = new FileInputStream(imagefile); } catch (FileNotFoundException e) { e.printStackTrace(); } Bitmap bm = BitmapFactory.decodeStream(fis); ByteArrayOutputStream baos = new ByteArrayOutputStream(); bm.compress(Bitmap.CompressFormat.JPEG, 100 , baos); byte[] b = baos.toByteArray(); encImage = Base64.encodeToString(b, Base64.DEFAULT);
他们已经包装了大多数需要解决你的问题的东西，其中一个testing看起来像这样：
String filename = CSSURLEmbedderTest.class.getResource("folder.png").getPath().replace("%20", " "); String code = "background: url(folder.png);"; StringWriter writer = new StringWriter(); embedder = new CSSURLEmbedder(new StringReader(code), true); embedder.embedImages(writer, filename.substring(0, filename.lastIndexOf("/")+1)); String result = writer.toString(); assertEquals("background: url(" + folderDataURI + ");", result);
这是另一个解决scheme…
System.IO.Stream st = new System.IO.StreamReader (picturePath).BaseStream; byte[] buffer = new byte[4096]; System.IO.MemoryStream m = new System.IO.MemoryStream (); while (st.Read (buffer,0,buffer.Length) > 0) { m.Write (buffer, 0, buffer.Length); } imgView.Tag = m.ToArray (); st.Close (); m.Close ();
希望它有帮助！
