在Intent之后读取的Android打开文本文件.ACTION_GET_CONTENT [英] Android open text file to read after Intent.ACTION_GET_CONTENT

问题描述

流为:

1. 用户需要选择要使用的文本文件，然后弹出默认的Android资源管理器.
2. 然后我要存储包含文件名的字符串，以实际打开文件进行读取.
3. 我想打开该文件，然后将其重写为应用程序内部存储中的新文件.
4. 我想从应用程序内部存储中打开新创建的文件.
5. 奖金1-如果现在是.txt文件，但现在是.doc，我想在上面重写的第3步中将他转换为常规的.txt文件.
   奖金2-如何处理大型文本文件?

1. The user needs to select text file for use and the default Android explorer whatever pops up.
2. Then I want to store string containing the file name, to actually open the file for reading.
3. I want to open that file and rewrite him to new file on app internal storage.
4. I want to open the new created file from app internal storage.
5. Bonus 1 - If it's now .txt file but .doc, I want to convert him to regular .txt file in step 3 above of rewriting.
   Bonus 2 - How to handle large text files?

代码如下:

// 1. Start with user action pressing on button to select file
addButton.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
        intent.setType("*/*");
        startActivityForResult(intent, PICKFILE_RESULT_CODE);          
    }
});

// 2. Come back here
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == PICKFILE_RESULT_CODE) {
        // Get the Uri of the selected file
        Uri uri = data.getData();
        String filePathName = "WHAT TODO ?";
        LaterFunction(filePathName);
    }
}

// 3. Later here
public void LaterFunction(String filePathName) {
    BufferedReader br;
    FileOutputStream os;
    try {
        br = new BufferedReader(new FileReader("WHAT TODO ?"));
        //WHAT TODO ? Is this creates new file with 
        //the name NewFileName on internal app storage?
        os = openFileOutput("newFileName", Context.MODE_PRIVATE);                     
        String line = null;
        while ((line = br.readLine()) != null) {
            os.write(line.getBytes());
        }
        br.close();
        os.close();
        lastFunction("newFileName");
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();     
    }
}

// 4. And in the end here
public void lastFunction(String newFileName) {
    //WHAT TODO? How to read line line the file 
    //now from internal app storage?
}

推荐答案

步骤1:删除String filePathName = "WHAT TODO ?";

步骤2:将LaterFunction(filePathName);更改为LaterFunction(uri);

步骤3:将br = new BufferedReader(new FileReader("WHAT TODO ?"));更改为br = new BufferedReader(new InputStreamReader(getContentResolver().openInputStream(uri));

这是解决您的问题的最低要求.

That is the minimum necessary to address your question.

但是，MIME类型*/*将匹配任何类型的文件，而不仅仅是文本文件.二进制文件不应使用readLine()复制.如果只需要纯文本文件，请使用text/plain而不是*/*.

However, a MIME type of */* will match any type of file, not just text files. Binary files should not be copied using readLine(). If you only want plain text files, use text/plain instead of */*.

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