与定义扩展的Andr​​oid浏览文件意图 [英] android browse file intent with defined extension

问题描述

我需要创建的意图，将打开文件管理器（如有安装），我希望文件管理器只显示txt文件到用户，所以用户无法选择使用错误的扩展文件。

 私有静态最终诠释FILE_SELECT_ code = 0;私人无效showFileChooser（）{
    意向意图=新意图（Intent.ACTION_GET_CONTENT）;
    intent.setType（* / *）;
    intent.addCategory（Intent.CATEGORY_OPENABLE）;
    尝试{
        startActivityForResult（
                Intent.createChooser（意向，选择txt文件），
                FILE_SELECT_ code）;
    }赶上（android.content.ActivityNotFoundException前）{
        //直接潜在用户市场提供一个对话
        Toast.makeText（this.getActivity（），请安装一个文件管理器。
                Toast.LENGTH_SHORT）.show（）;
    }
}公共无效的onActivityResult（INT申请code，INT结果code，意图数据）{
    开关（要求code）{
    案例FILE_SELECT_ code：
    如果（结果code == Activity.RESULT_OK）{
        //获取所选文件的URI
        URI URI = data.getData（）;
        字符串路径= uri.getPath（）;
        输入=新的文件（路径）;
        尝试{
            txtParser =新TxtFileParser（输入）;
        }赶上（FileNotFoundException异常五）{
            / *异常处理程序必须在这里！ * /
        }
    }
    打破;
}
    super.onActivityResult（要求code，结果code，数据）;
}
 

我设法做到这一点。但我不知道如何定义TXT扩展。

解决方案

  

我希望文件管理器只显示txt文件到用户，所以用户不能选择带有扩展名错误文件

确实没有可能的。欢迎您使用MIME类型文本/纯而不是 * / * ，但

• 谁也不能保证，这将只是一个 .TXT 扩展返回文件


• 没有保证，有能够处理 ACTION_GET_CONTENT 的MIME类型
设备上的任何应用程序

• 谁也不能保证任何的文件管理器将尊重您的MIME类型;他们可以选择反正显示所有文件

I need to create intent that will open file manager (if any installed) and I want file manager to show only txt files to user, so user couldn't choose file with wrong extension.

    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 txt file"),
                FILE_SELECT_CODE);
    } catch (android.content.ActivityNotFoundException ex) {
        // Potentially direct the user to the Market with a Dialog
        Toast.makeText(this.getActivity(), "Please install a File Manager.", 
                Toast.LENGTH_SHORT).show();
    }
}

public void onActivityResult(int requestCode, int resultCode, Intent data) {
    switch (requestCode) {
    case FILE_SELECT_CODE:      
    if (resultCode == Activity.RESULT_OK) {  
        // Get the Uri of the selected file 
        Uri uri = data.getData();
        String path = uri.getPath();
        input = new File(path);
        try {
            txtParser = new TxtFileParser(input);
        } catch (FileNotFoundException e) {
            /* Exception handler must be here! */
        }
    }           
    break;
}
    super.onActivityResult(requestCode, resultCode, data);
}

I managed to do this. But I don't know how to define txt extensions.

解决方案

I want file manager to show only txt files to user, so user couldn't choose file with wrong extension

That is not literally possible. You are welcome to use a MIME type of text/plain instead of */*, but:

• There is no guarantee that this will only return files with a .txt extension
• There is no guarantee that there is any app on the device that can handle ACTION_GET_CONTENT of that MIME type
• There is no guarantee that any "file manager" will honor your MIME type; they may elect to display all files anyway

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