我正在编写多级 json 解析程序，并且能够获取一级列表，但在点击一级列表项时不显示二级列表。
简而言之，我列出的类别在尝试列出点击类别的视频时遇到了问题。
我正在做这样的事情:
Main Activity [Listing Categories] > Another Activity [Listing Videos]
MainActivity.java:
static String NAME = "name";
static String THUMB = "thumb";
.............................
try {
// Locate the array name in JSON
jsonarray = jsonobject.getJSONArray("categories");
for (int i = 0; i < jsonarray.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
jsonobject = jsonarray.getJSONObject(i);
// Retrive JSON Objects
map.put("name", jsonobject.getString("name"));
map.put("thumb", jsonobject.getString("thumb"));
// Set the JSON Objects into the array
arraylist.add(map);
}
} catch (JSONException e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
MainAdapter.java:
// Capture ListView item click
itemView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// Get the position
resultp = data.get(position);
Intent intent = new Intent(context, AnotherActivity.class);
// Pass name
intent.putExtra("name", resultp.get(MainActivity.NAME));
// Start AnotherActivity Class
context.startActivity(intent);
}
});
return itemView;
}
注意:使用上面的代码获取类别列表
AnotherActivity.java-
static String THUMB = "thumb";
static String TITLE = "title";
static String SUBTITLE = "subtitle";
static String DESCRIPTION = "description";
........................
try {
// Locate the array name in JSON
jsonarray = jsonobject.getJSONArray("videos");
for (int i = 0; i < jsonarray.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
jsonobject = jsonarray.getJSONObject(i);
final JSONArray sources = jsonobject.getJSONArray("sources");
// Retrive JSON Objects
map.put("title", jsonobject.getString("title"));
map.put("thumb", jsonobject.getString("thumb"));
// Set the JSON Objects into the array
arraylist.add(map);
}
} catch (JSONException e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
Manifest.xml:-
<activity android:name="com.example.zing.AnotherActivity" />
JSON:
{
"categories": [
{
"name": "Dev Events",
"thumb": "http://www.androidbegin.com/tutorial/flag/unitedstates.png",
"videos": [
{
"sources": [
"http://commondatastorage.googleapis.com/gtv_template_assets/IO2010-Keynote-day1.mp4"
],
"thumb": "http://www.androidbegin.com/tutorial/flag/unitedstates.png",
"title": "2010 Day 1 Keynote",
"subtitle": "Dev Events",
"description": "IO2010 Keynote"
},
{
"sources": [
"http://commondatastorage.googleapis.com/gtv_template_assets/IO2010-Keynote-day2-android.mp4"
],
"thumb": "http://www.androidbegin.com/tutorial/flag/russia.png",
"title": "2010 Day 2 Keynote",
"subtitle": "Dev Events",
"description": "IO2010 Keynote Android"
}
]
},
{
"name": "Technology",
"thumb": "http://www.androidbegin.com/tutorial/flag/russia.png",
"videos": [
{
"sources": [
"http://commondatastorage.googleapis.com/gtv_template_assets/CWS-HowTo.mp4"
],
"thumb": "http://www.androidbegin.com/tutorial/flag/russia.png",
"title": "Uploading your App",
"subtitle": "Technology",
"description": "CWS HowTo"
},
{
"sources": [
"http://commondatastorage.googleapis.com/gtv_template_assets/CWS-GettingStarted.mp4"
],
"thumb": "http://www.androidbegin.com/tutorial/flag/unitedstates.png",
"title": "Getting Started with Apps for the Chrome Web Store",
"subtitle": "Technology",
"description": "Arne Roomann-Kurrik"
}
]
}
]
}
最佳答案
需要将json数组传递给另一个activity
然后
try
{
JSONArray jr = jb.getJSONArray("categories");
for(int i=0;i<jr.length();i++)
{
JSONObject jb1 = jr.getJSONObject(i);
JSONArray jr1 = jb1.getJSONArray("videos");
for(int j=0;j<jr1.length();j++)
{
JSONObject jb2 = jr1.getJSONObject(j);
String title =(String) jb2.get("title");
String thumb = (String) jb2.getString("thumb");
Log.i(".........",title);
Log.i(".........",thumb);
}
}
}
catch(Exception e)
{
e.printStackTrace();
}
日志
02-25 02:00:38.192: I/.........(1194): 2010 Day 1 Keynote
02-25 02:00:38.192: I/.........(1194): http://www.androidbegin.com/tutorial/flag/unitedstates.png
02-25 02:00:38.202: I/.........(1194): 2010 Day 2 Keynote
02-25 02:00:38.202: I/.........(1194): http://www.androidbegin.com/tutorial/flag/russia.png
02-25 02:00:38.202: I/.........(1194): Uploading your App
02-25 02:00:38.202: I/.........(1194): http://www.androidbegin.com/tutorial/flag/russia.png
02-25 02:00:38.202: I/.........(1194): Getting Started with Apps for the Chrome Web Store
02-25 02:00:38.212: I/.........(1194): http://www.androidbegin.com/tutorial/flag/unitedstates.png
编辑；
主 Activity .java
ListView lv = (ListView) findViewById(R.id.listView1);
ArrayList<HashMap<String,String>> arraylist= new ArrayList<HashMap<String,String>>();
try {
// Locate the array name in JSON
JSONObject jb= new JSONObject("your json");
jsonarray = jb.getJSONArray("categories");
for (int i = 0; i < jsonarray.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
JSONObject jsonobject = jsonarray.getJSONObject(i);
// Retrive JSON Objects
map.put("name", jsonobject.getString("name"));
map.put("thumb", jsonobject.getString("thumb"));
// Set the JSON Objects into the array
arraylist.add(map);
}
} catch (JSONException e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
String[] from = { "name","thumb" };
int[] to = { R.id.textView1,R.id.textView2 };
ListAdapter adapter = new SimpleAdapter(this,arraylist,R.layout.njk,from,to);
lv.setAdapter(adapter);
lv.setOnItemClickListener(new OnItemClickListener()
{
@Override
public void onItemClick(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
JSONObject jb;
try {
Intent intent = new Intent(MainActivity.this,SecondActivity.class);
jb = jsonarray.getJSONObject(arg2);
intent.putExtra("key",jb.toString());
startActivity(intent);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
第二个 Activity .java
public class SecondActivity extends Activity {
ListView lv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
lv= (ListView) findViewById(R.id.listView1);
ArrayList<HashMap<String,String>> arraylist= new ArrayList<HashMap<String,String>>();
try
{
String value = getIntent().getStringExtra("key");
JSONObject jb = new JSONObject(value);
JSONArray jr = jb.getJSONArray("videos");
for(int j=0;j<jr.length();j++)
{
HashMap<String,String> map = new HashMap<String,String>();
JSONObject jb2 = jr.getJSONObject(j);
String title =(String) jb2.get("title");
String thumb = (String) jb2.getString("thumb");
map.put("title",title);
map.put("thumb",thumb);
Log.i(".........",title);
Log.i(".........",thumb);
arraylist.add(map);
}
}catch(Exception e)
{
e.printStackTrace();
}
String[] from = { "title","thumb" };
int[] to = { R.id.textView1,R.id.textView2 };
ListAdapter adapter = new SimpleAdapter(this,arraylist,R.layout.njk,from,to);
lv.setAdapter(adapter);
}
njk.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView1"
android:layout_below="@+id/textView1"
android:layout_marginTop="26dp"
android:text="TextView" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginTop="28dp"
android:text="TextView" />
</RelativeLayout>
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true" >
</ListView>
</RelativeLayout>
activity_second.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".SecondActivity" >
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true" >
</ListView>
</RelativeLayout>
快照
关于android - 多级 JSON 解析，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/22006448/