繁体   English   中英

如何在Android中将`content:// media / external / images / media / Y`转换为`file:/// storage / sdcard0 / Pictures / X.jpg`?

[英]how to convert `content://media/external/images/media/Y` to `file:///storage/sdcard0/Pictures/X.jpg` in android?

我正在尝试从我的Android应用程序将图像上传到Google云端硬盘,

基于本教程

当我调试他们的示例项目时,我看到一个典型的fileUri =

file:///storage/sdcard0/Pictures/IMG_20131117_090231.jpg

在我的应用中,我想上传现有照片。

我这样检索它的路径

     private void GetAnyImage()
        {
            File dir = new File(Environment.getExternalStorageDirectory()
            .getAbsolutePath() + "/Pictures/Screenshots"); 
                              // --> /storage/sdcard0/Pictures/Screenshots

            Log.d("File path ", dir.getPath());
            String dirPath=dir.getAbsolutePath();
            if(dir.exists() && dir.isDirectory()) {
                Intent intent = new Intent(Intent.ACTION_GET_CONTENT, null);
                intent.setType("image/*");
                startActivityForResult(intent,REQUEST_ID);
            }  
        }

并最终得到这个典型的文件Uri = content://media/external/images/media/74275

但是,运行此行代码时

  private void saveFileToDrive() {

    //  progressDialog = ProgressDialog.show(this, "", "Loading...");

    Thread t = new Thread(new Runnable() {
      @Override
      public void run() {
        try {
          // File's binary content
          java.io.File fileContent = new java.io.File(fileUri.getPath());
          FileContent mediaContent = new FileContent("image/jpeg", fileContent);

      // File's metadata.
      File body = new File();
      body.setTitle(fileContent.getName());
      body.setMimeType("image/jpeg");

      File file = service.files().insert(body, mediaContent).execute();

我收到一个错误:

java.io.FileNotFoundException: /external/images/media/74275: open failed: ENOENT (No such file or directory)

我该如何解决?

如何将content://media/external/images/media/Yfile:///storage/sdcard0/Pictures/X.jpg

这样的事情对您有用吗? 这是查询内容解析器以查找为该内容条目存储的文件路径数据

public static 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();
        return cursor.getString(column_index);
    } finally {
        if (cursor != null) {
            cursor.close();
        }
    }
}

这最终将为您提供一个绝对的文件路径,您可以从中构建文件uri

如果您只想要位图,这也可以

InputStream inputStream = mContext.getContentResolver().openInputStream(uri);
Bitmap bmp = BitmapFactory.decodeStream(inputStream);
if( inputStream != null ) inputStream.close();

样本uri:content:// media / external / images / media / 12345

暂无
暂无

声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.

 
粤ICP备18138465号  © 2020-2024 STACKOOM.COM