Android

Question

有人知道如何在 listview 中使用 ratingbar 发送数据吗？

我和这个 link 有同样的问题，我试图找到答案，但我仍然没有解决它，而且我已经检查了他们之前建议的所有 link ,

我想知道他如何使用 ViewBinder 解决问题，但我不能 添加评论 因为需要50++ 代表发表评论，

所以我需要更多示例如何通过 JSON id

使用 ratingbar 将数据从 android 发送到 MySQL

有人可以推荐我吗？

Here is my code to display but not yet done to send data by user

MainActivity.java

import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.RatingBar;
import android.widget.SimpleAdapter;
import android.widget.Toast;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;
import java.util.HashMap;

public class MainActivity extends AppCompatActivity {

    private String TAG = MainActivity.class.getSimpleName();

    private ProgressDialog pDialog;
    private ListView lv;
    RatingBar rb1;

    ArrayList<HashMap<String, String>> contactList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        contactList = new ArrayList<>();
        lv = (ListView) findViewById(R.id.list);
        new GetContacts().execute();
    }

    /**
     * Async task class to get json by making HTTP call
     */
    private class GetContacts extends AsyncTask<Void, Void, Void> {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            // Showing progress dialog
            pDialog = new ProgressDialog(MainActivity.this);
            pDialog.setMessage("Please wait...");
            pDialog.setCancelable(false);
            pDialog.show();

        }

        @Override
        protected Void doInBackground(Void... arg0) {
            HttpHandler sh = new HttpHandler();

            // Making a request to url and getting response
            String url = "http://zxccvvv.netne.net/send_data.php";
            String jsonStr = sh.makeServiceCall(url);

            Log.e(TAG, "Response from url: " + jsonStr);

            if (jsonStr != null) {
                try {
                    JSONArray jsonObj = new JSONArray(jsonStr);

                    // looping through All Contacts
                    for (int i = 0; i < jsonObj.length(); i++) {
                        JSONObject c = jsonObj.getJSONObject(i);

                        String id = c.getString("id");
                        String ask = c.getString("ask");

                        HashMap<String, String> pertanyaans = new HashMap<>();

                        pertanyaans.put("id", id);
                        pertanyaans.put("ask", ask);

                        contactList.add(pertanyaans);
                    }
                } catch (final JSONException e) {
                    Log.e(TAG, "Json parsing error: " + e.getMessage());
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            Toast.makeText(getApplicationContext(),
                                    "Json parsing error: " + e.getMessage(),
                                    Toast.LENGTH_LONG)
                                    .show();
                        }
                    });

                }
            } else {
                Log.e(TAG, "Couldn't get json from server.");
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(getApplicationContext(),
                                "Couldn't get json from server. Check LogCat for possible errors!",
                                Toast.LENGTH_LONG)
                                .show();
                    }
                });

            }

            return null;
        }
        @Override
        protected void onPostExecute(Void result) {
            super.onPostExecute(result);
            // Dismiss the progress dialog
            if (pDialog.isShowing())
                pDialog.dismiss();
            /**
             * Updating parsed JSON data into ListView
             * */
            ListAdapter adapter = new SimpleAdapter(
                    MainActivity.this, contactList,
                    R.layout.list_item, new String[]{"ask"}, new int[]{R.id.ask});

            lv.setAdapter(adapter);
        }

    }
}

HttpHandler.java

import android.util.Log;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;

public class HttpHandler {

    private static final String TAG = HttpHandler.class.getSimpleName();

    public String makeServiceCall(String reqUrl) {
        String response = null;
        try {
            URL url = new URL(reqUrl);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setConnectTimeout(7000);
            conn.setRequestMethod("GET");
            // read the response
            InputStream in = new BufferedInputStream(conn.getInputStream());
            response = convertStreamToString(in);
        } catch (MalformedURLException e) {
            Log.e(TAG, "MalformedURLException: " + e.getMessage());
            e.printStackTrace();
        } catch (ProtocolException e) {
            Log.e(TAG, "ProtocolException: " + e.getMessage());
            e.printStackTrace();
        } catch (IOException e) {
            Log.e(TAG, "IOException: " + e.getMessage());
               e.printStackTrace();
        } catch (Exception e) {
            Log.e(TAG, "Exception: " + e.getMessage());
            e.printStackTrace();
        }
        return response;
    }

    private String convertStreamToString(InputStream is) {
        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder();

        String line;
        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line).append('\n');
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return sb.toString();
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="flix.yudi.okhttp1.MainActivity">

    <ListView
        android:id="@+id/list"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
</RelativeLayout>

list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="@dimen/activity_horizontal_margin">

    <TextView
        android:id="@+id/txtid"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:paddingBottom="2dip"
        android:paddingTop="6dip"
        android:textColor="@color/colorPrimaryDark"
        android:textSize="16sp"
        android:textStyle="bold" />

    <TextView
        android:id="@+id/ask"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:paddingBottom="2dip"
        android:paddingTop="6dip"
        android:textColor="@color/colorPrimaryDark"
        android:textSize="16sp"
        android:textStyle="bold" />

    <RatingBar
        android:id="@+id/rating"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        style="?android:attr/ratingBarStyle"
        android:numStars="5"
        android:stepSize="1" />

</LinearLayout>

Answer 1

您应该在列表适配器的 getView() 方法中执行此操作：

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    if (convertView == null) {
        convertView = inflater.inflate(R.layout.row_item, null, false);
    }

    text = (TextView) convertView.findViewById(R.id.title);
    text.setText(data.get(position).getTitle());

    rateBar = (RatingBar) convertView.findViewById(R.id.rate);

    rateBar.setOnRatingBarChangeListener(new RatingBar.OnRatingBarChangeListener() {
        @Override
        public void onRatingChanged(RatingBar ratingBar, float v, boolean b) {
            // you have your rating in v
            // now you can put it in your database
        }
    });

    return convertView;

}

更新 1：要首先拥有自定义视图，您需要编写 class 并扩展 BaseAdapter:

MyAdapter.java

public class MyAdapter extends BaseAdapter {

private final List<HashMap<String,String>> data;

private final LayoutInflater inflater;
private final Context context;
private CustomTextView text;


public MyAdapter(Context context, List<HashMap<String,String>> data) {
    this.context = context;
    this.data = data;
    inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

@Override
public int getCount() {
    return data.size();
}

@Override
public Object getItem(int position) {
    return data.get(position);
}

@Override
public long getItemId(int position) {
    return null;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    if (convertView == null) {
        convertView = inflater.inflate(R.layout.row_item, null, false);
    }

    text = (TextView) convertView.findViewById(R.id.txtid);
    rateBar = (RatingBar) convertView.findViewById(R.id.rating);

    rateBar.setOnRatingBarChangeListener(new     RatingBar.OnRatingBarChangeListener() {
        @Override
        public void onRatingChanged(RatingBar ratingBar, float v, boolean b)     {
            // you have your rating in v
            // now you can put it in your database
        }
    });

    return convertView;
    }
}

Android - 如何使用列表视图中的评级栏将数据发送到 mysql？

Android - How to use ratingbar in listview to send data into mysql?

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ratingbar