从内部存储读取 JSON 文件的内容

Question

如何从内部存储输出 JSON 文件的内容？以下是目前正在做的工作。

String filename = "names.json";
final File file = new File(Environment.getDataDirectory(), filename);
Log.d(TAG, String.valueOf(file));

日志显示为： /data/names.json

名称.json

[
  "names",
  {
    "name": "John Doe"
  }
]

Answer 1

从文件中读取字符串并将其转换为JsonObject或JsonArray

String jsongString = readFromFile();
JSONArray jarray = new JSONArray(str);

使用下面的方法从内部存储文件中读取数据并返回为String.

private String readFromFile() {

    String ret = "";
    InputStream inputStream = null;
    try {
        inputStream = openFileInput("names.json");

        if ( inputStream != null ) {
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
            String receiveString = "";
            StringBuilder stringBuilder = new StringBuilder();

            while ( (receiveString = bufferedReader.readLine()) != null ) {
                stringBuilder.append(receiveString);
            }

            ret = stringBuilder.toString();
        }
    }
    catch (FileNotFoundException e) {
        Log.e("login activity", "File not found: " + e.toString());
    } catch (IOException e) {
        Log.e("login activity", "Can not read file: " + e.toString());
    }
    finally {
      try {
         inputStream.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }

    return ret;
}