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我做了一個應用程序，從我的服務器獲取JSON文件，並在屏幕上顯示內容通過適配器在列表視圖中很好！我想創建一個onClick listner，它獲取已在listview中單擊的項目（0,1,2,3等）的編號，並創建另一個活動的意圖（併發送該編號）..我已經在其他問題上嘗試了幾個建議，但我無法讓他們工作..有人可以幫助我嗎？我似乎無法找到正確的解決方案：/創建一個列表視圖與列表視圖arrayAdapter意圖到其他屏幕
Recepten.java
public class Recepten extends Activity {
ListView list;
ReceptenAdapter adapter;
ArrayList<ReceptenDefine> receptenList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recepten);
list = (ListView)findViewById(R.id.receptenList);
receptenList = new ArrayList<>();
new ReceptenAsynTask().execute("http://janvandijk.me/zooi/receptenapp/getrecipes.php?type=request&datatype=recepten");
}
public class ReceptenAsynTask extends AsyncTask<String, Void, Boolean> {
@Override
protected Boolean doInBackground(String... params) {
try {
HttpClient client = new SystemDefaultHttpClient();
HttpPost post = new HttpPost(params[0]);
HttpResponse response = client.execute(post);
int status = response.getStatusLine().getStatusCode();
if (status == 200){
HttpEntity entity = response.getEntity();
String data = EntityUtils.toString(entity);
JSONArray jArray = new JSONArray(data); //jArray.length()
for (int i=0; i<jArray.length(); i++){
ReceptenDefine recept;
recept = new ReceptenDefine();
JSONObject jRealObject = jArray.getJSONObject(i);
recept.setReceptnaam(jRealObject.getString("naam"));
recept.setReceptauthor("Recept van: " + jRealObject.getString("unaam"));
recept.setReceptimageurl(jRealObject.getString("imgurl"));
recept.setReceptrating("Aantal sterren: " + jRealObject.getString("id"));
receptenList.add(recept);
}
return true;
}
} catch (JSONException | IOException e) {
e.printStackTrace();
}
return false;
}
@Override
protected void onPostExecute(Boolean result){
super.onPostExecute(result);
if(!result){
//Show message that data wasn't parsed
} else {
ReceptenAdapter adapter = new ReceptenAdapter(getApplicationContext(), R.layout.row, receptenList);
list.setAdapter(adapter);
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_recepten, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
Receptendefine.java
public class ReceptenDefine{
private String receptnaam;
private String receptauthor;
private String receptimageurl;
private String receptrating;
public ReceptenDefine(){
}
public String getReceptnaam() {
return receptnaam;
}
public void setReceptnaam(String receptnaam) {
this.receptnaam = receptnaam;
}
public String getReceptauthor() {
return receptauthor;
}
public void setReceptauthor(String receptauthor) {
this.receptauthor = receptauthor;
}
public String getReceptimageurl() {
return receptimageurl;
}
public void setReceptimageurl(String receptimageurl) {
this.receptimageurl = receptimageurl;
}
public String getReceptrating() {
return receptrating;
}
public void setReceptrating(String receptrating) {
this.receptrating = receptrating;
}
ReceptenAdapter.java
public class ReceptenAdapter extends ArrayAdapter<ReceptenDefine>{
ArrayList<ReceptenDefine> ArrayListRecepten;
int Resource;
Context context;
LayoutInflater vi;
public ReceptenAdapter(Context context, int resource, ArrayList<ReceptenDefine> objects) {
super(context, resource, objects);
ArrayListRecepten = objects;
Resource = resource;
this.context = context;
vi = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); //Verschillende items laten zien
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if(convertView == null){
//Eerste listview item wordt gemaakt
convertView = vi.inflate(Resource, null);
holder = new ViewHolder();
//Set all textview and imageview dingen
holder.listImage = (ImageView)convertView.findViewById(R.id.listImage);
holder.listAuthor = (TextView)convertView.findViewById(R.id.listAuthor);
holder.listName = (TextView)convertView.findViewById(R.id.listName);
holder.listRating = (TextView)convertView.findViewById(R.id.listRating);
//Zet het neer
convertView.setTag(holder);
} else {
//volgende list items, doe alles opnieuw zetten
holder = (ViewHolder)convertView.getTag();
}
new DownloadImageTask(holder.listImage).execute(ArrayListRecepten.get(position).getReceptimageurl());
holder.listName.setText(ArrayListRecepten.get(position).getReceptnaam());
holder.listAuthor.setText(ArrayListRecepten.get(position).getReceptauthor());
holder.listRating.setText(ArrayListRecepten.get(position).getReceptrating());
return convertView;
}
static class ViewHolder {
public ImageView listImage;
public TextView listName;
public TextView listAuthor;
public TextView listRating;
}
private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
ImageView bmImage;
public DownloadImageTask(ImageView bmImage) {
this.bmImage = bmImage;
}
protected Bitmap doInBackground(String... urls) {
String urldisplay = urls[0];
Bitmap mIcon = null;
try {
InputStream in = new java.net.URL(urldisplay).openStream();
mIcon = BitmapFactory.decodeStream(in);
} catch (Exception e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return mIcon;
}
protected void onPostExecute(Bitmap result) {
bmImage.setImageBitmap(result);
}
}