Android 从 URI 读取文本文件

Question

我有一个Uri指向来自 an 的文本文件intent，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，但失败了FileNotFoundException。该toString()方法似乎失去了/

java.io.FileNotFoundException: content:/com.google.android.apps.bigtop/attachments/downloads/528c4088144d1515d933ca406b7bc273/attachments/d_0_0_b562310a_52b6ec1c_c4d53f20d.txt 或 openNo.txt1800000000 文件失败

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();
    }
}

数据的价值是：

content://com.google.android.apps.bigtop/attachments/downloads/528c4088144d1515d933ca406b7bc273/attachments/d_0_0_b562310a_52b6ec1c_c4d5f0d3_73f7110d3_73f71289atxt%

而 data.getPath() 的值是

/attachments/downloads/528c4088144d1515d933ca406b7bc273/attachments/d_0_0_b562310a_52b6ec1c_c4d5f0d3_73f7489a_711e4cf2/undtitle

我现在试图直接从 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

F：

内容：/com.google.android.apps.bigtop/attachments/downloads/528c4088144d1515d933ca406b7bc273/attachments/d_0_0_b562310a_52b6ec1c_c4d5f0d3_73f7120d3_73f7120d3_73f712fc273

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) {

        }

Answer 2

从文件中读取文本：

private String readText() {
    File f = new File(Your_File_Path);
    FileInputStream inputStream = null;
    try {
        inputStream = new FileInputStream(f);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }
    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
    int i;
    try {
        i = inputStream.read();
        while (i != -1) {
            byteArrayOutputStream.write(i);
            i = inputStream.read();
        }
            inputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    return byteArrayOutputStream.toString();
}

该函数将返回 String，根据您的要求使用它。

使用如下：

Log.i("Text from File", readText());

完毕