安卓文件选择器 [英] Android file chooser

问题描述

我想做一个文件上传器.因此我需要一个文件选择器，但我不想自己写这个.我找到了 OI 文件管理器，我认为它适合我.但是如何强制用户安装 OI 文件管理器?如果我不能，是否有更好的方法在我的应用程序中包含文件管理器?谢谢

I want to make a file uploader. And I hence I need a file chooser but I don't want to write this by myself. I find OI file manager and I think it suits me. But how can I force user to install OI file manager? If I cannot , is there a better way to include a file manager in my app? Thx

推荐答案

编辑(2012 年 1 月 2 日):

我创建了一个小型开源 Android 库项目来简化这个过程，同时还提供了一个内置文件浏览器(以防用户没有).使用起来极其简单，只需要几行代码.

I created a small open source Android Library Project that streamlines this process, while also providing a built-in file explorer (in case the user does not have one present). It's extremely simple to use, requiring only a few lines of code.

您可以在 GitHub 上找到它:aFileChooser.

You can find it at GitHub: aFileChooser.

原创

如果您希望用户能够选择系统中的任何文件，您将需要包含您自己的文件管理器，或者建议用户下载一个.我相信你能做的最好的事情就是在 Intent.createChooser() 中寻找可打开"的内容，如下所示:

If you want the user to be able to choose any file in the system, you will need to include your own file manager, or advise the user to download one. I believe the best you can do is look for "openable" content in an Intent.createChooser() like this:

private static final int FILE_SELECT_CODE = 0;

private void showFileChooser() {
    Intent intent = new Intent(Intent.ACTION_GET_CONTENT); 
    intent.setType("*/*"); 
    intent.addCategory(Intent.CATEGORY_OPENABLE);

    try {
        startActivityForResult(
                Intent.createChooser(intent, "Select a File to Upload"),
                FILE_SELECT_CODE);
    } catch (android.content.ActivityNotFoundException ex) {
        // Potentially direct the user to the Market with a Dialog
        Toast.makeText(this, "Please install a File Manager.", 
                Toast.LENGTH_SHORT).show();
    }
}

然后您将在 onActivityResult() 中监听所选文件的 Uri，如下所示:

You would then listen for the selected file's Uri in onActivityResult() like so:

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    switch (requestCode) {
        case FILE_SELECT_CODE:
        if (resultCode == RESULT_OK) {
            // Get the Uri of the selected file 
            Uri uri = data.getData();
            Log.d(TAG, "File Uri: " + uri.toString());
            // Get the path
            String path = FileUtils.getPath(this, uri);
            Log.d(TAG, "File Path: " + path);
            // Get the file instance
            // File file = new File(path);
            // Initiate the upload
        }
        break;
    }
    super.onActivityResult(requestCode, resultCode, data);
}

我的 FileUtils.java 中的 getPath() 方法是:

The getPath() method in my FileUtils.java is:

public static String getPath(Context context, Uri uri) throws URISyntaxException {
    if ("content".equalsIgnoreCase(uri.getScheme())) {
        String[] projection = { "_data" };
        Cursor cursor = null;

        try {
            cursor = context.getContentResolver().query(uri, projection, null, null, null);
            int column_index = cursor.getColumnIndexOrThrow("_data");
            if (cursor.moveToFirst()) {
                return cursor.getString(column_index);
            }
        } catch (Exception e) {
            // Eat it
        }
    }
    else if ("file".equalsIgnoreCase(uri.getScheme())) {
        return uri.getPath();
    }

    return null;
} 

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