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[英]show pdf file inside android app from server url without give the permission download that file
[英]Show content of online server file on android app
我目前正在开发一个应用,用户可以从不同主题的列表视图中访问研究材料。
在从中获取主题名称的数据库表中,还有一列,该列具有指向我的在线服务器上的文件夹的文件路径。 每个主题在服务器上都有一个单独的文件夹。
我该如何添加代码,以便当用户单击列表中的主题时,其特定文件夹的内容显示在新活动中?
这是我在简单列表视图中的代码:
public class FindMaterialActivity extends Activity {
private ListView list;
private ArrayList<String> subjects;
private JSONArray result;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_find_material2);
list = (ListView) findViewById(R.id.list);
subjects = new ArrayList<String>();
getData();
}
private void getData() {
//Creating a string request
StringRequest stringRequest = new StringRequest(SubConfig.DATA_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
JSONObject j = null;
try {
//Parsing the fetched Json String to JSON Object
j = new JSONObject(response);
//Storing the Array of JSON String to our JSON Array
result = j.getJSONArray(SubConfig.JSON_ARRAY);
//Calling method getStudents to get the students from the JSON Array
getSubjects(result);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
});
//Creating a request queue
RequestQueue requestQueue = Volley.newRequestQueue(this);
//Adding request to the queue
requestQueue.add(stringRequest);
}
private void getSubjects(JSONArray j) {
//Traversing through all the items in the json array
for (int i = 0; i < j.length(); i++) {
try {
//Getting json object
JSONObject json = j.getJSONObject(i);
//Adding the name of the student to array list
subjects.add(json.getString(SubConfig.TAG_SUBJECTS));
} catch (JSONException e) {
e.printStackTrace();
}
}
//Setting adapter to show the items in the spinner
list.setAdapter(new ArrayAdapter<String>(FindMaterialActivity.this, android.R.layout.simple_list_item_1, subjects));
}
}
和主题config.java
public class SubConfig {
//JSON URL
public static final String DATA_URL = "http://opuna.co.uk/subject_api/FetchSub.php";
//Tags used in the JSON String
public static final String TAG_SUBJECTS = "Subject_Name";
public static final String TAG_SUB_ID = "Sub_id";
//JSON array name
public static final String JSON_ARRAY = "result";
}
像处理主题一样,将有关子文件夹的元数据存储在数据库中,并像处理主题一样在应用程序中使用JSON获取元数据,并以自己的自定义布局显示它们。
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