尝试通过使用Loopj并使用GSON库来处理json来获取数据。但无法运行代码。我不知道我在哪里做错了。
这是我的LoopjClient.class
public class LoopjClient {
AsyncHttpClient client;
RequestParams requestParams;
String jsonResponse;
ActorsResponse response=null;
public LoopjClient(){
client=new AsyncHttpClient();
requestParams=new RequestParams();
}
public void CallbackForGet(String url){
client.get(url,new JsonHttpResponseHandler(){
@Override
public void onSuccess(int statusCode, Header[] headers, String responseString) {
super.onSuccess(statusCode, headers, responseString);
// Toast.makeText(MainActivity.this, "this is success method of client", Toast.LENGTH_SHORT).show();
Gson gson=new GsonBuilder().create();
response=gson.fromJson(responseString,ActorsResponse.class);
}
@Override
public void onFailure(int statusCode, Header[] headers, String responseString, Throwable throwable) {
super.onFailure(statusCode, headers, responseString, throwable);
}
});
}
public List<ActorsResponse.ActorsBean> getData(){
return response.getActors();
}
}
这是我的MainActivity.class
public class MainActivity extends AppCompatActivity {
ListView lv;
List<ActorsResponse.ActorsBean> mList=null;
String url="http://microblogging.wingnity.com/JSONParsingTutorial/jsonActors";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv=(ListView)findViewById(R.id.actors_list);
LoopjClient client=new LoopjClient();
client.CallbackForGet(url);
mList=client.getData();
CustomActorAdapter adapter=new CustomActorAdapter(this,mList);
lv.setAdapter(adapter);
}
}
这是CustomAdapter.class
public class CustomAdapter extends BaseAdapter{
List<ActorsResponse.ActorsBean> mList;
Context context;
LayoutInflater mInflater;
public CustomActorAdapter(Context c, List<ActorsResponse.ActorsBean> object) {
mList=object;
context=c;
mInflater=(LayoutInflater)c.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return mList.size();
}
@Override
public Object getItem(int i) {
return i;
}
@Override
public long getItemId(int i) {
return i;
}
@Override
public View getView(int i, View view, ViewGroup viewGroup) {
ViewHolder holder=null;
if (view==null){
holder=new ViewHolder();
view=mInflater.inflate(R.layout.row,viewGroup,false);
holder.name=(TextView)view.findViewById(R.id.actor_name);
holder.dob=(TextView)view.findViewById(R.id.actor_dob);
holder.spouse=(TextView)view.findViewById(R.id.actor_spouse);
holder.height=(TextView)view.findViewById(R.id.actor_height);
holder.children=(TextView)view.findViewById(R.id.actor_children);
holder.nation=(TextView)view.findViewById(R.id.actor_country);
holder.desc=(TextView)view.findViewById(R.id.actor_desc);
holder.image=(ImageView)view.findViewById(R.id.actor_image);
view.setTag(holder);
}
else
{
holder=(ViewHolder)view.getTag();
holder.image.setImageDrawable(null);
}
String namu="Name: "+mList.get(i).getName();
String dobu="DOB: "+mList.get(i).getDob();
String spouseu="Spouse: "+mList.get(i).getSpouse();
String childrenu="Children: "+mList.get(i).getChildren();
String countryu="Country: "+mList.get(i).getCountry();
String heightu="Height: "+mList.get(i).getHeight();
String descu="DESCRIPTION : "+mList.get(i).getDescription();
String image=mList.get(i).getImage();
new DownloadImageTask(holder.image).execute(image);
holder.name.setText(namu);
holder.height.setText(heightu);
holder.nation.setText(countryu);
holder.dob.setText(dobu);
holder.spouse.setText(spouseu);
holder.children.setText(childrenu);
holder.desc.setText(descu);
return view;
}
static class ViewHolder{
TextView name;
TextView dob;
TextView spouse;
TextView children;
TextView height;
TextView nation;
TextView desc;
ImageView image;
}
public class DownloadImageTask extends AsyncTask<String,Void,Bitmap>{
ImageView img;
public DownloadImageTask(ImageView view){
this.img=view;
}
@Override
protected Bitmap doInBackground(String... strings) {
Bitmap pic=null;
String urldisplay=strings[0];
InputStream in= null;
try {
in = new URL(urldisplay).openStream();
pic=BitmapFactory.decodeStream(in);
} catch (IOException e) {
e.printStackTrace();
}
return pic;
}
@Override
protected void onPostExecute(Bitmap bitmap) {
img.setImageBitmap(bitmap);
}
}
}
还有最后一个类ActorsResponse.class，它是json格式的数据模型。
这是ActorsResponse.class
public class ActorsResponse {
private List<ActorsBean> actors;
public static ActorsResponse objectFromData(String str) {
return new com.google.gson.Gson().fromJson(str, ActorsResponse.class);
}
public static ActorsResponse objectFromData(String str, String key) {
try {
JSONObject jsonObject = new JSONObject(str);
return new com.google.gson.Gson().fromJson(jsonObject.getString(str), ActorsResponse.class);
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
public static List<ActorsResponse> arrayActorsResponseFromData(String str) {
Type listType = new com.google.gson.reflect.TypeToken<ArrayList<ActorsResponse>>() {
}.getType();
return new com.google.gson.Gson().fromJson(str, listType);
}
public static List<ActorsResponse> arrayActorsResponseFromData(String str, String key) {
try {
JSONObject jsonObject = new JSONObject(str);
Type listType = new com.google.gson.reflect.TypeToken<ArrayList<ActorsResponse>>() {
}.getType();
return new com.google.gson.Gson().fromJson(jsonObject.getString(str), listType);
} catch (JSONException e) {
e.printStackTrace();
}
return new ArrayList();
}
public List<ActorsBean> getActors() {
return actors;
}
public void setActors(List<ActorsBean> actors) {
this.actors = actors;
}
public static class ActorsBean {
/**
* name : Brad Pitt
* description : William Bradley 'Brad' Pitt is an American actor and film producer. He has received a Golden Globe Award, a Screen Actors Guild Award, and three Academy Award nominations in acting categories
* dob : December 18, 1963
* country : United States
* height : 1.80 m
* spouse : Jennifer Aniston
* children : Shiloh Nouvel Jolie-Pitt, Maddox Chivan Jolie-Pitt
* image : http://microblogging.wingnity.com/JSONParsingTutorial/brad.jpg
*/
private String name;
private String description;
private String dob;
private String country;
private String height;
private String spouse;
private String children;
private String image;
public static ActorsBean objectFromData(String str) {
return new com.google.gson.Gson().fromJson(str, ActorsBean.class);
}
public static ActorsBean objectFromData(String str, String key) {
try {
JSONObject jsonObject = new JSONObject(str);
return new com.google.gson.Gson().fromJson(jsonObject.getString(str), ActorsBean.class);
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
public static List<ActorsBean> arrayActorsBeanFromData(String str) {
Type listType = new com.google.gson.reflect.TypeToken<ArrayList<ActorsBean>>() {
}.getType();
return new com.google.gson.Gson().fromJson(str, listType);
}
public static List<ActorsBean> arrayActorsBeanFromData(String str, String key) {
try {
JSONObject jsonObject = new JSONObject(str);
Type listType = new com.google.gson.reflect.TypeToken<ArrayList<ActorsBean>>() {
}.getType();
return new com.google.gson.Gson().fromJson(jsonObject.getString(str), listType);
} catch (JSONException e) {
e.printStackTrace();
}
return new ArrayList();
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getDob() {
return dob;
}
public void setDob(String dob) {
this.dob = dob;
}
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
public String getHeight() {
return height;
}
public void setHeight(String height) {
this.height = height;
}
public String getSpouse() {
return spouse;
}
public void setSpouse(String spouse) {
this.spouse = spouse;
}
public String getChildren() {
return children;
}
public void setChildren(String children) {
this.children = children;
}
public String getImage() {
return image;
}
public void setImage(String image) {
this.image = image;
}
}
}
它只是给出错误， mList 是CustomAdapter.class中的空对象。我是朝正确的方向做的吗？ 真的需要帮助!!!