Android如何从SD卡读取json文件(文本文件),并将数据显示到textview

这个问题在这里已经有一个答案：> Sending and Parsing JSON Objects11
我有以下文本文件到我的SdCard.Now我想通过Json解析器解析这个文件,我想解析并读取这个文件并将数据显示在我的文本视图中,我该怎么做？

{
"data": [
    {
        "id": "1","title": "Farhan Shah","duration": 10,},{
        "id": "2","title": "Noman Shah",{
        "id": "3","title": "Ahmad Shah",{
        "id": "4","title": "Mohsin Shah",{
        "id": "5","title": "Haris Shah",}
  ]

}

这是代码：

File sdcard = Environment.getExternalStorageDirectory();

    //Get the text file

    File file = new File(sdcard,"textarabics.txt");

    String UTF8 = "utf8";
    int BUFFER_SIZE = 8192;


    //Read text from file
    StringBuilder text = new StringBuilder();

我得到的文件,但现在我不知道我如何解析数据？

解决方法

使用 File从SD卡读取JSON文件,并使用 JSONObject进行解析.

这里有一个起始码：

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

public class ReadJsonFile {
public ReadFile (){ 
            try {
            File yourFile = new File(Environment.getExternalStorageDirectory(),"path/to/the/file/inside_the_sdcard/textarabics.txt");
            FileInputStream stream = new FileInputStream(yourFile);
            String jsonStr = null;
            try {
                FileChannel fc = stream.getChannel();
                MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY,fc.size());

                jsonStr = Charset.defaultCharset().decode(bb).toString();
              }
              catch(Exception e){
              e.printstacktrace();
              }
              finally {
                stream.close();
              }
/*  String jsonStr = "{\n\"data\": [\n    {\n        \"id\": \"1\",\n        \"title\": \"Farhan Shah\",\n        \"duration\": 10\n    },\n    {\n        \"id\": \"2\",\n        \"title\": \"Noman Shah\",\n    {\n        \"id\": \"3\",\n        \"title\": \"Ahmad Shah\",\n    {\n        \"id\": \"4\",\n        \"title\": \"Mohsin Shah\",\n    {\n        \"id\": \"5\",\n        \"title\": \"Haris Shah\",\n        \"duration\": 10\n    }\n  ]\n\n}\n";
  */     
                 JSONObject jsonObj = new JSONObject(jsonStr);

                // Getting data JSON Array nodes
                JSONArray data  = jsonObj.getJSONArray("data");

                // looping through All nodes
                for (int i = 0; i < data.length(); i++) {
                    JSONObject c = data.getJSONObject(i);

                    String id = c.getString("id");
                    String title = c.getString("title");
                    String duration = c.getString("duration");
                    //use >  int id = c.getInt("duration"); if you want get an int


                    // tmp hashmap for single node
                    HashMap<String,String> parsedData = new HashMap<String,String>();

                    // adding each child node to HashMap key => value
                    parsedData.put("id",id);
                    parsedData.put("title",title);
                    parsedData.put("duration",duration);


                    // do what do you want on your interface
                  }


           } catch (Exception e) {
           e.printstacktrace();
          }
     }
}

不要忘记在你的主播上添加读取存储：

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />