相关疑难解决方法(0)

我正试图从画廊获取图像.

Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select picture"), resultCode );

从这个活动返回后,我有一个包含Uri的数据.看起来像:

content://media/external/images/1

如何将此路径转换为真实路径(就像' /sdcard/image.png')？

谢谢

我尝试了一个解决方案(见下文)工作正常,除了在Android 4.4中调用startActivityForResult()一个名为"Open from"的活动,其中包含"Recent","Images","Downloads"以及几个可供选择的应用程序.当我选择"图像"并尝试解析返回的内容URI(使用下面的代码)时,调用cursor.getString()返回null.如果我使用Gallery应用程序选择完全相同的文件,则cursor.getString()返回文件路径.我只在API级别16和19中对此进行了测试.一切都按照16中的预期运行.至于19,我必须选择Gallery或其他应用程序,否则它不起作用.

private String getRealPathFromURI(Context context, Uri contentUri) {
    Cursor cursor = null;
    try { 
        String[] proj = { MediaStore.Images.Media.DATA };
        cursor = context.getContentResolver().query(contentUri,  proj, null, null, null);
        int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        String path = cursor.getString(column_index);

        return path;
    } finally {
        if (cursor != null) {
            cursor.close();
        }
    }
}

在我的项目中,我必须将从Android设备拍摄的图像发送到服务器站点,它应该存储在磁盘上.不幸的是,当我在设备网站上调用该方法时,我遇到了这个错误:

DEBUG/Retrofit(4429): java.lang.RuntimeException: 
    Unable to write multipart request.
at retrofit.mime.MultipartTypedOutput.buildPart(MultipartTypedOutput.java:86)
at retrofit.mime.MultipartTypedOutput.addPart(MultipartTypedOutput.java:49)
at retrofit.RequestBuilder.setArguments(RequestBuilder.java:211)
at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:264)
at retrofit.RestAdapter$RestHandler.access$500(RestAdapter.java:197)
at retrofit.RestAdapter$RestHandler$1.obtainResponse(RestAdapter.java:243)
at retrofit.CallbackRunnable.run(CallbackRunnable.java:38)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at retrofit.Platform$Android$2$1.run(Platform.java:134)
at java.lang.Thread.run(Thread.java:856)

Caused by: java.io.FileNotFoundException: /external/images/media/1270: 
    open failed: ENOENT (No such file or directory)
at libcore.io.IoBridge.open(IoBridge.java:416)
at java.io.FileInputStream.<init>(FileInputStream.java:78)
at retrofit.mime.TypedFile.writeTo(TypedFile.java:74)
at retrofit.mime.MultipartTypedOutput.buildPart(MultipartTypedOutput.java:83)
... 10 more

Caused by: libcore.io.ErrnoException: 
    open failed: ENOENT (No such file or directory)
at libcore.io.Posix.open(Native Method)
at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
at libcore.io.IoBridge.open(IoBridge.java:400)
... 13 more

这是方法的声明

@Multipart
@POST("/monument/photo/upload")
void addMonumentPhoto(@Part("MonumentID") int …