【发布时间】：2015-01-07 15:08:05
【问题描述】：
现在被这个小问题困扰了一段时间。这很简单，但让我感到困惑。我的第一个活动是使用 volley 下载 json 数据的列表视图，点击后转到详细活动，如下所示
我可以将标题发送到详细信息活动，但也无法解决传递图像的问题。 这是我的第一个活动：
public class Movies extends ActionBarActivity{
// 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;
private static String Title="title";
private static String bitmap="thumbnailUrl";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.event);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
Intent newActivity2=new Intent();
setResult(RESULT_OK, newActivity2);
listView = (ListView) findViewById(R.id.list);
adapter = new CustomListAdapter(this, movieList);
listView.setAdapter(adapter);
pDialog = new ProgressDialog(this);
// Showing progress dialog before making http request
pDialog.setMessage("Loading...");
pDialog.show();
// changing action bar color
getActionBar().setBackgroundDrawable(
new ColorDrawable(Color.parseColor("#1b1b1b")));
// Creating volley request obj
JsonArrayRequest movieReq = new JsonArrayRequest(url,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
Log.d(TAG, response.toString());
pDialog.dismiss();
// 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) {
if (error instanceof NoConnectionError){
Toast.makeText(getBaseContext(), "Bummer..There's No Internet connection!", Toast.LENGTH_LONG).show();
}};
});
// Adding request to request queue
ParseApplication.getInstance().addToRequestQueue(movieReq);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
String name = ((TextView) view.findViewById(R.id.title))
.getText().toString();
Intent intent = new Intent(Movies.this, Detail.class);
intent.putExtra(Title, name);
intent.putExtra("images", bitmap);
startActivity(intent);
}
});}
@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;
}
}
详细活动
public class Detail extends ActionBarActivity{
private static String Title="title";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.detail);
getSupportActionBar().hide();
Intent i=getIntent();
String name = i.getStringExtra(Title);
TextView lblName = (TextView) findViewById(R.id.name_label);
lblName.setText(name);}
public void onClickHandler(View v){
switch(v.getId()){
case R.id.imageview1:
startActivity(new Intent(this,Movies.class));
}
}}
如果需要，我会发布更多代码。我是这方面的新手，因此我们将不胜感激。
自定义列表适配器：
public class CustomListAdapter extends BaseAdapter {
private Activity activity;
private LayoutInflater inflater;
private List<Movie> movieItems;
ImageLoader imageLoader = AppController.getInstance().getImageLoader();
public CustomListAdapter(Activity activity, List<Movie> movieItems) {
this.activity = activity;
this.movieItems = movieItems;
}
@Override
public int getCount() {
return movieItems.size();
}
@Override
public Object getItem(int location) {
return movieItems.get(location);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (inflater == null)
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null)
convertView = inflater.inflate(R.layout.list_row, null);
if (imageLoader == null)
imageLoader = AppController.getInstance().getImageLoader();
NetworkImageView thumbNail = (NetworkImageView) convertView
.findViewById(R.id.thumbnail);
TextView title = (TextView) convertView.findViewById(R.id.title);
TextView rating = (TextView) convertView.findViewById(R.id.rating);
TextView genre = (TextView) convertView.findViewById(R.id.genre);
TextView year = (TextView) convertView.findViewById(R.id.releaseYear);
// getting movie data for the row
Movie m = movieItems.get(position);
// thumbnail image
thumbNail.setImageUrl(m.getThumbnailUrl(), imageLoader);
// title
title.setText(m.getTitle());
// rating
rating.setText("Rating: " + String.valueOf(m.getRating()));
// genre
String genreStr = "";
for (String str : m.getGenre()) {
genreStr += str + ", ";
}
genreStr = genreStr.length() > 0 ? genreStr.substring(0,
genreStr.length() - 2) : genreStr;
genre.setText(genreStr);
// release year
year.setText(String.valueOf(m.getYear()));
return convertView;
}
}
【问题讨论】：
-
我遵循了相同的教程，但我想传递整数、双精度和数组列表。我该怎么做？
-
您可以在调用意图之前尝试
String mytext3 = String.valueOf(.....);，然后将intent.putExtra(Rate, rate);作为额外的传递。 -
好的，我需要定位 textView 的评级？您能否详细说明将这个双精度值传递给另一个活动？
-
你好史蒂夫，我成功了，在这种情况下，电影（整数）和 ArrayList 或流派的发布年份怎么样？
-
对于数组列表，我认为您不需要传递它，只需在您希望数组列表出现的活动的 onCreate 方法上初始化数组列表
标签： android json android-volley