我正在尝试解析json数据并在我的自定义列表视图中显示它。
public class MainActivity extends Activity {
ListView list;
ArrayList<listview> array_list = new ArrayList<listview>();
class listview {
String description;
public listview(String description) {
this.description = description;
}
}
class MyAdapter extends BaseAdapter {
public MyAdapter(Context context) {
}
@Override
public int getCount() {
return array_list.size();
}
@Override
public Object getItem(int position) {
return array_list.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@SuppressLint("ViewHolder")
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.listview, parent, false);
TextView description = (TextView) view
.findViewById(R.id.description);
listview list = array_list.get(position);
description.setText(list.description);
return view;
}
}
class getJson_data extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... params) {
Get_data data = new Get_data();
String output = "";
try {
output = data.get_info();
JSONArray jarray = new JSONArray(output);
for (int i = 0; i < jarray.length(); i++) {
JSONObject jobject = jarray.getJSONObject(i);
JSONObject product = jobject.getJSONObject("product");
String description = product.getString("desc");
array_list.add(new listview(description));
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
.permitAll().build();
StrictMode.setThreadPolicy(policy);
}
new getJson_data().execute();
list = (ListView) findViewById(R.id.listview1);
list.setAdapter(new MyAdapter(this));
}
}
下面你可以找到我的自定义布局listview.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="@+id/title"
android:text="@string/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/imageView1"
android:layout_toRightOf="@+id/imageView1"
android:textAppearance="?android:attr/textAppearanceMedium" />
<ImageView
android:id="@+id/imageView2"
android:layout_width="32dp"
android:layout_height="32dp"
android:layout_alignBottom="@+id/description"
android:layout_alignTop="@+id/imageView3"
android:layout_marginRight="21dp"
android:layout_toLeftOf="@+id/imageView3"
android:contentDescription="@string/image_info"
android:src="@drawable/arrow_icon_circle" />
<ImageView
android:id="@+id/imageView3"
android:layout_width="25dp"
android:layout_height="25dp"
android:layout_alignBottom="@+id/description"
android:layout_alignParentRight="true"
android:layout_marginRight="18dp"
android:contentDescription="@string/image_info"
android:src="@drawable/delete" />
<ImageView
android:id="@+id/imageView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/imageView1"
android:layout_alignLeft="@+id/title"
android:contentDescription="@string/image_info"
android:src="@drawable/verified_circle_check_icon" />
<TextView
android:id="@+id/description"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/imageView4"
android:layout_toRightOf="@+id/title"
android:text="@string/text"
android:textAppearance="?android:attr/textAppearanceSmall" />
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="22dp"
android:layout_marginTop="19dp"
android:contentDescription="@string/image_info"
android:src="@drawable/ic_launcher" />
</RelativeLayout>
下面是一个帮助程序类（它工作正常），它提取json数据，将其转换为字符串并将其返回给doInBackground方法。
Get_data data = new Get_data();
String output = "";
try {
output = data.get_info();
以下是我从辅助类方法获得的json数据
[
{
"@type": "item",
"ID": 1036,
"product": {
"active": true,
"categories": [],
"desc": "thubnil image icon testing",
"gtins": [],
"id": 443,
"image": "",
"modelNumber": "thubnil im",
"name": "test image"
}
},
{
"@type": "item",
"ID": 781,
"product": {
"active": true,
"categories": [],
"desc": "cars",
"gtins": [],
"id": 46,
"image": "",
"modelNumber": "car1234",
"name": "Cars"
}
},
{
"@type": "item",
"ID": 783,
"product": {
"active": true,
"categories": [],
"desc": "cars",
"gtins": [],
"id": 46,
"image": "",
"modelNumber": "car1234",
"name": "Cars"
}
}
]
但我的列表视图中没有出现任何内容......我哪里出错了？关于如何做到这一点的任何建议都会对我有所帮助。提前致谢