java - Android 从 URI 读取文本文件

Question

我有一个 Uri 指向来自 intent 的文本文件，我正在尝试读取该文件以解析其中的字符串。这是我尝试过的方法，但因 FileNotFoundException 而失败。 toString() 方法似乎丢失了一个 /

java.io.FileNotFoundException: content:/com.google.android.apps.bigtop/attachments/downloads/528c4088144d1515d933ca406b7bc273/attachments/d_0_0_b562310a_52b6ec1c_c4d5f0d3_73f7489a_711e4cf2/untitled%20text.txt: open failed: ENOENT (No such file or directory)

Uri data = getIntent().getData();
String text = data.toString();
if(data != null) {

    try {
       File f = new File(text);
       FileInputStream is = new FileInputStream(f); // Fails on this line
       int size = is.available();
       byte[] buffer = new byte[size];
       is.read(buffer);
       is.close();
       text = new String(buffer);
       Log.d("attachment: ", text);
    } catch (IOException e) {
        // TODO Auto-generated catch block
       e.printStackTrace();
    }
}

数据的值(value)是:

content://com.google.android.apps.bigtop/attachments/downloads/528c4088144d1515d933ca406b7bc273/attachments/d_0_0_b562310a_52b6ec1c_c4d5f0d3_73f7489a_711e4cf2/untitled%20text.txt

data.getPath()的值是

/attachments/downloads/528c4088144d1515d933ca406b7bc273/attachments/d_0_0_b562310a_52b6ec1c_c4d5f0d3_73f7489a_711e4cf2/untitled text.txt

我现在尝试直接从 Uri 而不是路径获取文件:

Uri data = getIntent().getData();
String text = data.toString();
//...
File f = new File(text);

但是 f 似乎丢失了 content://

中的斜杠之一

:

content:/com.google.android.apps.bigtop/attachments/downloads/528c4088144d1515d933ca406b7bc273/attachments/d_0_0_b562310a_52b6ec1c_c4d5f0d3_73f7489a_711e4cf2/untitled%20text.txt

Answer 1

Uri uri = data.getData();

        try {
            InputStream in = getContentResolver().openInputStream(uri);


            BufferedReader r = new BufferedReader(new InputStreamReader(in));
            StringBuilder total = new StringBuilder();
            for (String line; (line = r.readLine()) != null; ) {
                total.append(line).append('\n');
            }

            String content = total.toString();



        }catch (Exception e) {

        }