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如標題所示，我希望能夠將ACTION_DOWN上給出的座標傳遞給內部類的onPostExecute方法。過去兩天我一直試圖這樣做，但沒有成功。我如何去做這件事？任何幫助表示讚賞:)將MotionEvent的ActionDown座標傳遞給內部類（AsyncTask）
這裏是我的代碼：
package io.music.ui.settings;
import android.app.ProgressDialog;
import android.content.Intent;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.SystemClock;
import android.support.annotation.Nullable;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import io.music.R;
import io.music.ui.base.BaseFragment;
import io.music.ui.main.MainActivity;
import android.view.MotionEvent;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.RequestQueue;
import com.android.volley.toolbox.JsonArrayRequest;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import static android.R.attr.x;
public class SettingsFragment extends BaseFragment {
public static final int CONNECTION_TIMEOUT = 10000;
public static final int READ_TIMEOUT = 15000;
private RecyclerView mRVFishPrice;
private AdapterFish mAdapter;
public float x = 0.95f;
//String xx = String.format("%.2f", x);
public float y = 0;
float x1, x2, y1, y2;
List<DataFish> data=new ArrayList<>();
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.fragment_settings, container, false);
view.setOnTouchListener(new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
int action = event.getAction();
if (action == MotionEvent.ACTION_DOWN) {
x = 2f * (event.getX()/v.getWidth()) - 1f;
y = -2f * (event.getY()/v.getHeight()) + 1f;
//x1 = x - 0.1f;
//x2 = x + 0.1f;
//y1 = y - 0.1f;
//y2 = y + 0.1f;
TextView textView = (TextView) getView().findViewById(R.id.textView2);
textView.setText(String.format("%.2f", x));
TextView textView2 = (TextView) getView().findViewById(R.id.textView3);
textView2.setText(String.format("%.2f", y));
}
mRVFishPrice = (RecyclerView) view.findViewById(R.id.fishPriceList);
mAdapter = new AdapterFish(getActivity(), data);
mRVFishPrice.setAdapter(mAdapter);
mRVFishPrice.setLayoutManager(new LinearLayoutManager(getActivity()));
return false;
}
});
new AsyncFetch().execute();
return view;
}
private class AsyncFetch extends AsyncTask<String, String, String> {
ProgressDialog pdLoading = new ProgressDialog(getActivity());
HttpURLConnection conn;
URL url = null;
@Override
protected void onPreExecute() {
super.onPreExecute();
//this method will be running on UI thread
pdLoading.setMessage("\tLoading...");
pdLoading.setCancelable(false);
pdLoading.show();
}
@Override
protected String doInBackground(String... params) {
try {
// Enter URL address where your json file resides
// Even you can make call to php file which returns json data
url = new URL("http://example.com/Subjects2.php");
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return e.toString();
}
try {
// Setup HttpURLConnection class to send and receive data from php and mysql
conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(READ_TIMEOUT);
conn.setConnectTimeout(CONNECTION_TIMEOUT);
conn.setRequestMethod("POST");
// setDoOutput to true as we recieve data from json file
conn.setDoOutput(true);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
return e1.toString();
}
try {
int response_code = conn.getResponseCode();
// Check if successful connection made
if (response_code == HttpURLConnection.HTTP_OK) {
// Read data sent from server
InputStream input = conn.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(input));
StringBuilder result = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
result.append(line);
}
// Pass data to onPostExecute method
return (result.toString());
} else {
return ("unsuccessful");
}
} catch (IOException e) {
e.printStackTrace();
return e.toString();
} finally {
conn.disconnect();
}
}
@Override
public void onPostExecute(String result) {
//this method will be running on UI thread
pdLoading.dismiss();
pdLoading.dismiss();
try {
JSONArray jArray = new JSONArray(result);
// Extract data from json and store into ArrayList as class objects
for(int i=0;i<jArray.length();i++){
JSONObject json_data = jArray.getJSONObject(i);
String xx= String.format("%.2f", x);
if(json_data.getString("X").equals(xx)) {
DataFish fishData = new DataFish();
fishData.fishName = json_data.getString("SongName");
fishData.catName = json_data.getString("X");
fishData.sizeName = json_data.getString("Y");
data.add(fishData);
}
}
// Setup and Handover data to recyclerview
} catch (JSONException e) {
Toast.makeText(getActivity(), e.toString(), Toast.LENGTH_LONG).show();
}
}
}
}
編輯：我也想說明，我試圖讓變量x和y到onPostExecute方法，我已經把價值對於x只是爲了測試json輸出是否正確。我想x協調來自於TouchListener。
不清楚你想要做什麼，你在屏幕上用戶點擊前正在執行'AsyncTask'，所以你不要有任何的座標給你的任務呢。你的意思是在'TouchListener'內調用'execute'嗎？ – marmor
@marmor當它是TouchListener裏，每次我在屏幕上大盤再次加載整個JSON輸出到recyclerview。這就是爲什麼我把它放在外面。我意識到這可能是一個糟糕的主意（抱歉，我是Android開發人員和Java新手）。我應該怎麼做呢？ – user3135937