如何通过一个Intent打开Android的文件 [英] How to open a file in Android via an Intent
问题描述
我怎么能打开已pviously存储在普里瓦文件系统$ P $文件?该文件是由一个web服务下载和应存储在本地fs的。
我想通过一个Intent(ACTION_VIEW)打开文件时,一个奇怪的错误。尽管文件是在文件系统present(看到在模拟器/月食文件浏览器中的文件),它不会在启动呼叫galery活动显示。取而代之的是画面的显示galery一个黑色的屏幕并不满足在那里(除了操作栏)。尝试通过这个方法(PDF举例说,该文件已损坏),打开一个PDF /电影/ MP3文件时同样会发生。
BTW:已存储在本地FS中的数据是有效的(未损坏),我下载的调试器(通过拉法)的文件,这些文件可以在工作站上的...
打开 公共无效onAttachment(上下文的背景下,附件附件){
尝试{
//附件是一个包含一个字节的结构化数据对象[],文件名和MIME类型(如图像/ JPEG)
FOS的FileOutputStream = FileOutputStream中FOS = context.openFileOutput(attachment.getAttachmentFileName(),Context.MODE_PRIVATE);
fos.write(attachment.getBinary());
fos.flush();
fos.close();
文件f = context.getFileStreamPath(attachment.getAttachmentFileName());
URI URI = Uri.fromFile(F);
意向意图=新意图(Intent.ACTION_VIEW);
intent.setDataAndType(URI,attachment.getAttachmentMimetype());
context.startActivity(意向);
}赶上(IOException异常五){
e.printStackTrace();
}
}
在设定的位置 openFileOutput(文件名,Activity.MODE_WORLD_READABLE)
,将工作。其他应用无法读取(即使是观看)设置为当存储 Context.MODE_PRIVATE
看<一个href=\"http://stackoverflow.com/questions/7399001/android-uri-for-open-an-image-with-action-view\">other张贴在计算器
how can I open a file that has been previously stored in the "privat" filesystem? The file is being downloaded by a webservice and should be stored on local fs. I got a "strange" error when trying to open the file via an Intent (Action_View). Although the file is present in the filesystem (saw the file in the file explorer in emulator/eclipse) it won't be shown in the calling galery activity that is launched. Instead of the picture the galery shows a black screen with not content in there (except the action bar). The same occurs when trying to open a pdf/movie/mp3 file via this method (pdf says for example that the file is corrupt).
BTW: The data that has been stored on the local fs is valid (not corrupt), I downloaded the files from debugger (via pull method) and the files can be opened on my workstation...
public void onAttachment(Context context, Attachment attachment) {
try {
//Attachment is a structured data object that contains of a byte[], filename and mimetype (like image/jpeg)
FileOutputStream fos = FileOutputStream fos = context.openFileOutput(attachment.getAttachmentFileName(), Context.MODE_PRIVATE);
fos.write(attachment.getBinary());
fos.flush();
fos.close();
File f = context.getFileStreamPath(attachment.getAttachmentFileName());
Uri uri = Uri.fromFile(f);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(uri,attachment.getAttachmentMimetype());
context.startActivity(intent);
} catch (IOException e) {
e.printStackTrace();
}
}
When setting the location to "openFileOutput("fileName", Activity.MODE_WORLD_READABLE)
" it will work. Other apps cannot read the data (even for viewing) stored when setting to "Context.MODE_PRIVATE
"
see other post on stackoverflow
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