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

时间:2013-11-17 07:26:33

标签: java android

我正在尝试从我的Android应用上传图片到Google云端硬盘,

基于此tutorial

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fileUri = content://media/external/images/media/74275

但是在运行这行代码时

  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();

我收到错误:

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

我该如何解决这个问题?

如何将content://media/external/images/media/Y转换为file:///storage/sdcard0/Pictures/X.jpg

2 个答案:

答案 0 :(得分:67)

这样的事情对你有用吗?这样做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();
        }
    }
}

这将最终为您提供一个绝对文件路径,您可以从

构建文件uri

答案 1 :(得分:5)

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();

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