ANDROID创建一个JSON提要一个String [] [英] Android create a String[] from a Json Feed
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问题描述
我有一个懒惰的名单，在目前的图像列表加载URL是在String []硬codeD，我想通过一个JSON饲料加载它们。所以我的问题是我怎么可以创建一个JSONObject的字符串[]？
继承人什么香港专业教育学院走到这一步
{尝试
post.setEntity（新UrlEn codedFormEntity（对））;
HTT presponse响应= client.execute（岗位）;
的BufferedReader读者=新的BufferedReader（新的InputStreamReader（response.getEntity（）的getContent（），UTF-8）。）;
JSON字符串= reader.readLine（）;
fulldata =将String.valueOf（JSON）;
Log.v（对myApp，newsdata+ fulldata）; 新闻列表=新的ArrayList＆LT;串GT;（）;
newsList2 =新的ArrayList＆LT;串GT;（）;
newsList3 =新的ArrayList＆LT;串GT;（）; JSONObject的OBJ =新的JSONObject（JSON）;
JSONObject的objData = obj.getJSONObject（数据）;
JSONArray jArray = objData.getJSONArray（新闻）;
对于（INT T = 0; T＆LT; newsAmount;吨++）{
JSONObject的newsTitleDict = jArray.getJSONObject（T）;//这是我想要的图像加载到一个String []
JSONArray ImageArray = objData.getJSONArray（新闻）; newsList3.add（newsTitleDict.getString（标题））; } 对于（INT T = 0; T＆LT; 1;吨++）{
JSONObject的newsTitleDict = jArray.getJSONObject（T）; newsList.add（newsTitleDict.getString（标题））;
newsList2.add（newsTitleDict.getString（标题））; } }赶上（ClientProtocolException E）{
// TODO自动生成catch块
e.printStackTrace（）;
}赶上（IOException异常五）{
// TODO自动生成catch块
e.printStackTrace（）;
}赶上（JSONException E）{
// TODO自动生成catch块
e.printStackTrace（）;
}
arrayAdapter =新ArrayAdapter＆LT;串GT;（这一点，R.layout.single_item，新闻列表）;
arrayAdapter2 =新ArrayAdapter＆LT;串GT;（这一点，R.layout.single_item，newsList2）;
// arrayAdapter3 =新ArrayAdapter（这一点，R.layout.complex_item，newsList3）; 的String [] = mStrings {
http://a3.twimg.com/profile_images/670625317/aam-logo-v3-twitter.png
http://a3.twimg.com/profile_images/740897825/AndroidCast-350_normal.png
http://a3.twimg.com/profile_images/121630227/Droid_normal.jpg
http://a1.twimg.com/profile_images/957149154/twitterhalf_normal.jpg
http://a1.twimg.com/profile_images/97470808/icon_normal.png
}; arrayAdapter3 =新LazyAdapter（这一点，mStrings）;
ListView控件列表= getListView（）;
list.setTextFilterEnabled（真）; LayoutInflater吹气=（LayoutInflater）this.getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
查看标题= inflater.inflate（R.layout.homeheader，列表，FALSE）;
查看HEADER2 = inflater.inflate（R.layout.homeheader2，列表，FALSE）;
查看header3 = inflater.inflate（R.layout.homeheader3，列表，FALSE）; 适配器=新MergeAdapter（）;
adapter.addView（头）;
adapter.addAdapter（arrayAdapter）;
adapter.addView（HEADER2）;
adapter.addAdapter（arrayAdapter2）;
adapter.addView（header3）;
adapter.addAdapter（arrayAdapter3）;
setListAdapter（适配器）; }
解决方案
这是我怎么添加值使用来自一个JSONObject一个ArrayList的String []。我的例子使用了一个JSONArray，但你可以随时更改以适应您的code。
的ArrayList＆LT;串GT; arrayName中=新的ArrayList＆LT;串GT;（）;
ArrayList的＆LT;串GT; arrayPicture =新的ArrayList＆LT;串GT;（）;捆绑额外= getIntent（）getExtras（）。
apiResponse = extras.getString（API_RESPONSE）;尝试{ JSONArray JAFriends =新JSONArray（apiResponse）; 的for（int i = 0; I＆LT; JAFriends.length（）;我++）{
json_data = JAFriends.getJSONObject（ⅰ）;
如果（json_data.has（名字））{
字符串getFriendName = json_data.getString（名称）与toUpperCase（）。
arrayName.add（getFriendName）;
}其他{
字符串getFriendName = NULL;
arrayName.add（getFriendName）;
} 如果（json_data.has（pic_square））{
串getFriendPhoto = json_data.getString（pic_square）;
arrayPicture.add（getFriendPhoto）;
}其他{
字符串getFriendPhoto = NULL;
arrayPicture.add（getFriendPhoto）;
}
}
}赶上（JSONException E）{
返回;
}
字符串名称=新的String [arrayName.size（）];
字符串名称= arrayName.toArray（字符串名称）;stringPicture =新的String [arrayPicture.size（）];
stringPicture = arrayPicture.toArray（stringPicture）;listofFriends =（ListView控件）findViewById（R.id.list）;
适配器=新FriendsAdapter（这一点，字符串名称，stringPicture）;listofFriends.setAdapter（适配器）;
在他为循环，使用的如果的语句，以确保没有错误蠕变，返回值添加到它们各自的的ArrayList和6号线在适配器之前，$ C $的C 设置，从的ArrayList中的值添加到字符串[]。
希望这有助于解决您的问题。
i have a lazy list that loads in a list of images at the moment the urls are hard coded in a String[] and i'm wanting to load them via a json feed. so my question is how can i create a string[] from a JsonObject?
heres what ive got so far
try {
post.setEntity (new UrlEncodedFormEntity(pairs));
HttpResponse response = client.execute(post);
BufferedReader reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent(), "UTF-8"));
String json = reader.readLine();
fulldata = String.valueOf(json);
Log.v("myApp","newsdata" + fulldata);
newsList = new ArrayList<String>();
newsList2 = new ArrayList<String>();
newsList3 = new ArrayList<String>();
JSONObject obj = new JSONObject(json);
JSONObject objData = obj.getJSONObject("data");
JSONArray jArray = objData.getJSONArray("news");
for(int t = 0; t < newsAmount; t++){
JSONObject newsTitleDict = jArray.getJSONObject(t);
//this is where i want to load the images into a String[]
JSONArray ImageArray = objData.getJSONArray("news");
newsList3.add(newsTitleDict.getString("title"));
}
for(int t = 0; t < 1; t++){
JSONObject newsTitleDict = jArray.getJSONObject(t);
newsList.add(newsTitleDict.getString("title"));
newsList2.add(newsTitleDict.getString("title"));
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
arrayAdapter = new ArrayAdapter<String>(this, R.layout.single_item, newsList);
arrayAdapter2 = new ArrayAdapter<String>(this, R.layout.single_item, newsList2);
//arrayAdapter3 = new ArrayAdapter(this, R.layout.complex_item, newsList3);
String[] mStrings={
"http://a3.twimg.com/profile_images/670625317/aam-logo-v3-twitter.png",
"http://a3.twimg.com/profile_images/740897825/AndroidCast-350_normal.png",
"http://a3.twimg.com/profile_images/121630227/Droid_normal.jpg",
"http://a1.twimg.com/profile_images/957149154/twitterhalf_normal.jpg",
"http://a1.twimg.com/profile_images/97470808/icon_normal.png",
};
arrayAdapter3 = new LazyAdapter(this, mStrings);
ListView list = getListView();
list.setTextFilterEnabled(true);
LayoutInflater inflater = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE );
View header = inflater.inflate( R.layout.homeheader, list, false);
View header2 = inflater.inflate( R.layout.homeheader2, list, false);
View header3 = inflater.inflate( R.layout.homeheader3, list, false);
adapter = new MergeAdapter();
adapter.addView(header);
adapter.addAdapter(arrayAdapter);
adapter.addView(header2);
adapter.addAdapter(arrayAdapter2);
adapter.addView(header3);
adapter.addAdapter(arrayAdapter3);
setListAdapter(adapter);
}
解决方案
This is how I add values to a String[] using an ArrayList from a JSONObject. My example uses a JSONArray, but you can always change that to fit your code.
ArrayList<String> arrayName = new ArrayList<String>();
ArrayList<String> arrayPicture = new ArrayList<String>();
Bundle extras = getIntent().getExtras();
apiResponse = extras.getString("API_RESPONSE");
try {
JSONArray JAFriends = new JSONArray(apiResponse);
for (int i = 0; i < JAFriends.length(); i++) {
json_data = JAFriends.getJSONObject(i);
if (json_data.has("name")) {
String getFriendName = json_data.getString("name").toUpperCase();
arrayName.add(getFriendName);
} else {
String getFriendName = null;
arrayName.add(getFriendName);
}
if (json_data.has("pic_square")) {
String getFriendPhoto = json_data.getString("pic_square");
arrayPicture.add(getFriendPhoto);
} else {
String getFriendPhoto = null;
arrayPicture.add(getFriendPhoto);
}
}
} catch (JSONException e) {
return;
}
stringName = new String[arrayName.size()];
stringName = arrayName.toArray(stringName);
stringPicture = new String[arrayPicture.size()];
stringPicture = arrayPicture.toArray(stringPicture);
listofFriends = (ListView)findViewById(R.id.list);
adapter = new FriendsAdapter(this, stringName, stringPicture);
listofFriends.setAdapter(adapter);
In he for loop, using if statements to ensure no errors creep in, the returned values are added to their respective ArrayLists and 6 lines of code before the adapter is set, the values from the ArrayLists are added to the String[].
Hope this helps solve your question.
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