Android 实现MClickListener,然后在另一个活动中显示JSON数据
如何在ListView中加载特定的JSON数据,该数据包含单击的ListView项中包含的所有数据?我不知道如何在detailinfo中显示json数据 主要活动Android 实现MClickListener,然后在另一个活动中显示JSON数据,android,json,listview,Android,Json,Listview,如何在ListView中加载特定的JSON数据,该数据包含单击的ListView项中包含的所有数据?我不知道如何在detailinfo中显示json数据 主要活动 public class MainActivity extends Activity { // Log tag private static final String TAG = MainActivity.class.getSimpleName(); // Movies json url private static final
public class MainActivity extends Activity {
// Log tag
private static final String TAG = MainActivity.class.getSimpleName();
// Movies json url
private static final String url = "http://api.androidhive.info/json/movies.json";
private ProgressDialog pDialog;
private List<Movie> movieList = new ArrayList<Movie>();
private ListView listView;
private CustomListAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.list);
adapter = new CustomListAdapter(this, movieList);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
if (position == 0) {
Intent myIntent = new Intent(view.getContext(), detailinfo.class);
startActivityForResult(myIntent, 0);
}
if (position == 1) {
Intent myIntent = new Intent(view.getContext(), detailinfo2.class);
startActivityForResult(myIntent, 0);
}
if (position == 2) {
Intent myIntent = new Intent(view.getContext(), detailinfo3.class);
startActivityForResult(myIntent, 0);
}
if (position == 3) {
Intent myIntent = new Intent(view.getContext(), detailinfo.class);
startActivityForResult(myIntent, 0);
}
if (position == 4) {
Intent myIntent = new Intent(view.getContext(), detailinfo2.class);
startActivityForResult(myIntent, 0);
}
if (position == 5) {
Intent myIntent = new Intent(view.getContext(), detailinfo3.class);
startActivityForResult(myIntent, 0);
}
if (position == 6) {
Intent myIntent = new Intent(view.getContext(), detailinfo.class);
startActivityForResult(myIntent, 0);
}
if (position == 7) {
Intent myIntent = new Intent(view.getContext(), detailinfo2.class);
startActivityForResult(myIntent, 0);
}
}
});
pDialog = new ProgressDialog(this);
// Showing progress dialog before making http request
pDialog.setMessage("Loading...");
pDialog.show();
// Creating volley request obj
JsonArrayRequest movieReq = new JsonArrayRequest(url,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
Log.d(TAG, response.toString());
hidePDialog();
// Parsing json
for (int i = 0; i < response.length(); i++) {
try {
JSONObject obj = response.getJSONObject(i);
Movie movie = new Movie();
movie.setTitle(obj.getString("title"));
movie.setThumbnailUrl(obj.getString("image"));
movie.setRating(((Number) obj.get("rating"))
.doubleValue());
movie.setYear(obj.getInt("releaseYear"));
// Genre is json array
JSONArray genreArry = obj.getJSONArray("genre");
ArrayList<String> genre = new ArrayList<String>();
for (int j = 0; j < genreArry.length(); j++) {
genre.add((String) genreArry.get(j));
}
movie.setGenre(genre);
// adding movie to movies array
movieList.add(movie);
} catch (JSONException e) {
e.printStackTrace();
}
}
// notifying list adapter about data changes
// so that it renders the list view with updated data
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
hidePDialog();
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(movieReq);
}
@Override
public void onDestroy() {
super.onDestroy();
hidePDialog();
}
private void hidePDialog() {
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
电影
public class Movie {
private String title, thumbnailUrl;
private int year;
private double rating;
private ArrayList<String> genre;
public Movie() {
}
public Movie(String name, String thumbnailUrl, int year, double rating,
ArrayList<String> genre) {
this.title = name;
this.thumbnailUrl = thumbnailUrl;
this.year = year;
this.rating = rating;
this.genre = genre;
}
public String getTitle() {
return title;
}
public void setTitle(String name) {
this.title = name;
}
public String getThumbnailUrl() {
return thumbnailUrl;
}
public void setThumbnailUrl(String thumbnailUrl) {
this.thumbnailUrl = thumbnailUrl;
}
public int getYear() {
return year;
}
public void setYear(int year) {
this.year = year;
}
public double getRating() {
return rating;
}
public void setRating(double rating) {
this.rating = rating;
}
public ArrayList<String> getGenre() {
return genre;
}
public void setGenre(ArrayList<String> genre) {
this.genre = genre;
}
}
公共类电影{
私有字符串标题,缩略图URL;
私人国际年;
私人双重评级;
私人阿雷亚主义流派;
公共电影(){
}
公共电影(字符串名称、字符串缩略图URL、整数年、双评级、,
ArrayList流派){
this.title=名称;
this.thumbnailUrl=thumbnailUrl;
今年=年;
这个。评级=评级;
这个。流派=流派;
}
公共字符串getTitle(){
返回标题;
}
public void setTitle(字符串名称){
this.title=名称;
}
公共字符串getThumbnailUrl(){
返回缩略图URL;
}
公共void setThumbnailUrl(字符串thumbnailUrl){
this.thumbnailUrl=thumbnailUrl;
}
公共int getYear(){
回归年;
}
公共年(国际年){
今年=年;
}
公共双重评级(){
回报率;
}
公共评级(双重评级){
这个。评级=评级;
}
公共ArrayList getgreen(){
回归体裁;
}
公共无效集合类型(ArrayList类型){
这个。流派=流派;
}
}
它携带单击的ListView项中包含的所有数据
一般来说,使用意图附加项
更快的方法是在movie类上实现Parcelable接口 您可以通过在下一个活动中使用的意图传递可包裹对象
要获取单击的项目,您可以使用适配器。getItem(position)非常好的答案如下: 您只需要使您的电影类实现可序列化。 然后在onClick pass movie对象中,就像intent.putExtra(“movie”,movie) 在第二个活动中,将其作为
getIntent.getSerializableExtra(“电影”)
使用
将Java对象转换为JSON
String jsonInString = gson.toJson(obj);
将JSON转换为Java对象
YourClass yourClass = gson.fromJson(jsonInString, YourClass .class);
将Java对象转换为itemClick上的JsonString并通过intent将其发送给detailActivity,然后在detailActivity中获取intent数据并将其转换为Java对象。另一种解决方案是将对象序列化为json字符串,然后在第二个activity中反序列化。是的,这是可能的。谢谢,但是如果我只想传递特定的json数据(标题、图像和评级),怎么办?为什么要在json中传递这些数据?我的意思是希望标题、图片、收视率都是字符串,你们可以在意图中单独传递。截击是为了提出一个高效的服务器请求。它不用于在活动之间通信数据。您的意思是使用详细信息活动中的截取来发出新的服务器请求吗?谢谢,伙计,但在这种情况下,我使用截取来解析json,我可以简单地调用详细信息活动中的截取来显示json数据吗?意图附加的大小有限,因此json并不总是最好的@默认情况下,Moacito-Volley不会将JSON解析为字符串或JSONObject以外的任何内容。这些库做不同的事情,可以一起使用。
YourClass yourClass = gson.fromJson(jsonInString, YourClass .class);