Android：将Bytearray写入文件
我正在尝试编写从服务器接收到的 byteArray。这是我的代码
private fun writePdf(content: ByteArray) {
val storageDir = getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS)
val file = File("${storageDir?.path}/", "${Date().time}Download.pdf")
try {
// file.writeBytes(archivo)
val os = FileOutputStream(file, false)
os.write(content)
os.flush()
os.close()
} catch (e: IOException) {
e.printStackTrace()
}
val intent = Intent(Intent.ACTION_VIEW)
val uri = FileProvider
.getUriForFile(
this,
this.packageName + ".fileprovider",
file)
intent.setDataAndType(uri, "application/pdf")
intent.flags = Intent.FLAG_ACTIVITY_CLEAR_TOP
try{
startActivity(intent)
}catch (e: Exception){
e.printStackTrace()
Toast.makeText(this, "Error", Toast.LENGTH_LONG)
.show()
}
}
问题是，当pdf打开时它是空白的，就像什么也没写一样。
- 我尝试过使用 FileOutputStream 和 File.writeBytes 进行写入。
- 我已经检查了 byteArray（以防损坏或其他问题），它没有问题。
- 我在写入之前和之后检查了文件的length()，它的长度相应增加。
谢谢，感谢任何形式的帮助。
I'm trying to write a byteArray received from a server. This is my code
private fun writePdf(content: ByteArray) {
val storageDir = getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS)
val file = File("${storageDir?.path}/", "${Date().time}Download.pdf")
try {
// file.writeBytes(archivo)
val os = FileOutputStream(file, false)
os.write(content)
os.flush()
os.close()
} catch (e: IOException) {
e.printStackTrace()
}
val intent = Intent(Intent.ACTION_VIEW)
val uri = FileProvider
.getUriForFile(
this,
this.packageName + ".fileprovider",
file)
intent.setDataAndType(uri, "application/pdf")
intent.flags = Intent.FLAG_ACTIVITY_CLEAR_TOP
try{
startActivity(intent)
}catch (e: Exception){
e.printStackTrace()
Toast.makeText(this, "Error", Toast.LENGTH_LONG)
.show()
}
}
The problem is that when the pdf opens it is blank, like nothing has been written.
- I've tried writing with FileOutputStream and File.writeBytes.
- I've checked the byteArray (in case is corrupted or something) and it has no problems.
- I've checked the length() of the file before and after writing, and it's length increases accordingly.
Thanks, any kind of help is appreciated.
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我终于找到了问题所在，并解决了。上面的代码一切正常；问题是用于可视化 PDF 的意图的标志是错误的。而不是：
应该是：
I finally found the problem, and solution. Everything with the code above was okay; the problem was that the flags for the intent to visualize the PDF were wrong. Instead of:
It should be: