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...

 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（）;    }} 

解决方案

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