Приложение просмотра json data fetch Studio прекрасно работает на эмуляторе, но не на моем устройстве - PullRequest
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Приложение просмотра json data fetch Studio прекрасно работает на эмуляторе, но не на моем устройстве

0 голосов
/ 03 ноября 2019

Я разрабатываю приложение, которое читает из базы данных mySQL, используя объекты PHP и JSON. Затем я хочу, чтобы данные отображались в режиме просмотра / просмотра карт. Я следовал этому учебному пособию онлайн (https://www.simplifiedcoding.net/retrieve-data-mysql-database-android/), и он отлично работает на эмуляторе, но не на моем физическом устройстве (Samsung Galaxy A7 2017).

В журнале событий, когда я запускаю на обоих эмуляторахи устройство получило сообщение об ошибке; 

E/RecyclerView: No adapter attached; skipping layout

, но на эмуляторе это все еще работает нормально *

Я следовал за этим вопросом о стеке и не работал; Приложение Android работаетна эмуляторе, но не на реальном устройстве

Где он попросил изменить java android:supportsRtl="true" на "false" в манифесте.

business_list.xml 

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

    <androidx.cardview.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="5dp">

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="177dp"
            android:paddingTop="10dp"
            android:paddingBottom="10dp">

            <ImageView
                android:id="@+id/ivLogo"
                android:layout_width="108dp"
                android:layout_height="77dp"
                android:layout_alignParentStart="true"
                android:layout_alignParentTop="true"
                android:layout_marginStart="5dp"
                android:layout_marginRight="5dp"
                android:layout_marginLeft="5dp"
                android:layout_marginTop="5dp"
                android:layout_marginEnd="1dp"
                android:padding="4dp" />

            <TextView
                android:id="@+id/tvBusName"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentTop="true"
                android:layout_marginStart="5dp"
                android:layout_marginRight="5dp"
                android:layout_marginLeft="5dp"
                android:layout_marginTop="5dp"
                android:layout_marginEnd="1dp"
                android:layout_toRightOf="@id/ivLogo"
                android:fontFamily="@font/roboto_slab"
                android:text="The Bookshelf"
                android:textAppearance="@style/TextAppearance.AppCompat.Display1"
                android:textColor="#000000"
                android:textSize="24sp" />

            <TextView
                android:id="@+id/tvAddress"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@id/tvBusName"
                android:layout_marginStart="5dp"
                android:layout_marginRight="5dp"
                android:layout_marginLeft="5dp"
                android:layout_marginTop="5dp"
                android:layout_marginEnd="1dp"
                android:layout_toRightOf="@id/ivLogo"
                android:fontFamily="@font/roboto_light_italic"
                android:text="78 S Mall, Centre, Cork"
                android:textAppearance="@style/TextAppearance.AppCompat.Medium" />

            <TextView
                android:id="@+id/tvBusDesc"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@+id/tvAddress"
                android:layout_alignParentEnd="true"
                android:layout_marginStart="5dp"
                android:layout_marginRight="5dp"
                android:layout_marginLeft="5dp"
                android:layout_marginTop="5dp"
                android:layout_marginEnd="1dp"
                android:layout_toEndOf="@+id/ivLogo"
                android:layout_toRightOf="@id/ivLogo"
                android:fontFamily="@font/roboto_light"
                android:text="The Bookshelf Coffee House is a comfortable and relaxed experience where you can come and enjoy some home baking and great coffee with friends."
                android:textAppearance="@style/TextAppearance.AppCompat.Small" />

        </RelativeLayout>

    </androidx.cardview.widget.CardView>

</LinearLayout>

activity_main.xml 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    tools:context=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:scrollbars="vertical" />

</RelativeLayout>

Бизнес-класс Business.java 

package com.example.loyaltybusiness;

public class Business {
    private int merchantId;
    private String businessName;
    private String address;
    private String busDesc;
    private String logo;

    public Business(int merchantId, String businessName, String address, String busDesc, String logo) {
        this.setMerchantId(merchantId);
        this.setBusinessName(businessName);
        this.setAddress(address);
        this.setBusDesc(busDesc);
        this.setLogo(logo);
    }

    // Getters and Setters for the fields we want the customer to see
    public int getMerchantId() {
        return merchantId;
    }

    public void setMerchantId(int merchantId) {
        this.merchantId = merchantId;
    }

    public String getBusinessName() {
        return businessName;
    }

    public void setBusinessName(String businessName) {
        this.businessName = businessName;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getBusDesc() {
        return busDesc;
    }

    public void setBusDesc(String busDesc) {
        this.busDesc = busDesc;
    }

    public String getLogo() {
        return logo;
    }

    public void setLogo(String logo) {
        this.logo = logo;
    }
}

BusinessAdapter # 

package com.example.loyaltybusiness;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.recyclerview.widget.RecyclerView;

import com.bumptech.glide.Glide;

import java.util.ArrayList;
import java.util.List;

public class BusinessAdapter extends RecyclerView.Adapter<BusinessAdapter.BusinessViewHolder> {


    private Context mCtx;
    private List<Business> businessList;

    //public BusinessAdapter(Context mCtx, List<Business> businessList) {
    //    this.mCtx = mCtx;
    //    this.businessList = businessList;
    //}

    public BusinessAdapter(Context mContext) {
        this.mCtx = mContext;

    }

    public void addData(List<Business> businessList) {
        this.businessList = businessList;
        notifyDataSetChanged();
    }


    @Override
    public BusinessViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater inflater = LayoutInflater.from(mCtx);
        View view = inflater.inflate(R.layout.business_list, parent, false);
        return new BusinessViewHolder(view);
    }

    @Override
    public void onBindViewHolder(BusinessViewHolder holder, int position) {
        Business business = businessList.get(position);

        //loading the image
        Glide.with(mCtx)
                .load(business.getLogo())
                .into(holder.ivLogo);

        holder.tvBusName.setText(business.getBusinessName());
        holder.tvAddress.setText(business.getAddress());
        holder.tvBusDesc.setText(String.valueOf(business.getBusDesc()));
    }

    @Override
    public int getItemCount() {
        return businessList.size();
    }

    class BusinessViewHolder extends RecyclerView.ViewHolder {

        TextView tvBusName, tvAddress, tvBusDesc;
        ImageView ivLogo;

        public BusinessViewHolder(View itemView) {
            super(itemView);

            tvBusName = itemView.findViewById(R.id.tvBusName);
            tvAddress = itemView.findViewById(R.id.tvAddress);
            tvBusDesc = itemView.findViewById(R.id.tvBusDesc);
            ivLogo = itemView.findViewById(R.id.ivLogo);
        }
    }
}

MainActivity.java 

package com.example.loyaltybusiness;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.text.format.Formatter;

import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;

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

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    //this is the JSON Data URL
    //make sure you are using the correct ip else it will not work

    //WifiManager wm = (WifiManager) getApplicationContext().getSystemService(WIFI_SERVICE);
    //String ip = Formatter.formatIpAddress(wm.getConnectionInfo().getIpAddress());

    //private final String URL_BUSINESS = "http://" + ip + "/business.php";

    private static final String URL_BUSINESS = "http://myipaddress/business.php";

    //a list to store all the products
    List<Business> businessList;

    //the recyclerview
    RecyclerView recyclerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //getting the recyclerview from xml
        recyclerView = findViewById(R.id.recyclerView);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));



        //initializing the productlist
        businessList = new ArrayList<>();

        //this method will fetch and parse json
        //to display it in recyclerview
        loadBusiness();
    }

    private void loadBusiness() {

        /*
         * Creating a String Request
         * The request type is GET defined by first parameter
         * The URL is defined in the second parameter
         * Then we have a Response Listener and a Error Listener
         * In response listener we will get the JSON response as a String
         * */
        StringRequest stringRequest = new StringRequest(Request.Method.GET, URL_BUSINESS,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        try {
                            //converting the string to json array object
                            JSONArray array = new JSONArray(response);

                            //traversing through all the object
                            for (int i = 0; i < array.length(); i++) {

                                //getting product object from json array
                                JSONObject business = array.getJSONObject(i);

                                //adding the product to product list
                                businessList.add(new Business(
                                        business.getInt("merchantId"),
                                        business.getString("businessName"),
                                        business.getString("address"),
                                        business.getString("busDesc"),
                                        business.getString("logo")

                                ));
                            }

                            //creating adapter object and setting it to recyclerview
                            BusinessAdapter adapter = new BusinessAdapter(MainActivity.this);
                            adapter.addData(businessList);
                            recyclerView.setAdapter(adapter);
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {

                    }
                });

        //adding our stringrequest to queue
        Volley.newRequestQueue(this).add(stringRequest);
    }
}

манифест

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.loyaltybusiness">

    <!-- the internet permission -->
    <uses-permission android:name="android.permission.INTERNET" />



    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <meta-data
            android:name="preloaded_fonts"
            android:resource="@array/preloaded_fonts" />
    </application>

</manifest>

файлы gradle уровня приложения 

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "com.example.loyaltybusiness"
        minSdkVersion 21
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }

    //packagingOptions {
    //    pickFirst 'META-INF/services/javax.annotation.processing.Processor'
    //}

}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.0.2'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'

    //Volley Libraries
    implementation 'com.android.volley:volley:1.1.1-rc1'

    implementation 'androidx.recyclerview:recyclerview-selection:1.0.0'
    implementation "androidx.cardview:cardview:1.0.0"

    //Glide Libraries
    implementation 'com.github.bumptech.glide:glide:4.10.0'
    annotationProcessor 'com.github.bumptech.glide:compiler:4.10.0'
}

gradle уровня проекта 

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "com.example.loyaltybusiness"
        minSdkVersion 21
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }

    //packagingOptions {
    //    pickFirst 'META-INF/services/javax.annotation.processing.Processor'
    //}

}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.0.2'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'

    //Volley Libraries
    implementation 'com.android.volley:volley:1.1.1-rc1'

    implementation 'androidx.recyclerview:recyclerview-selection:1.0.0'
    implementation "androidx.cardview:cardview:1.0.0"

    //Glide Libraries
    implementation 'com.github.bumptech.glide:glide:4.10.0'
    annotationProcessor 'com.github.bumptech.glide:compiler:4.10.0'
}

Ожидаемый результат: предприятия, которые будут перечислены в представлении переработчика представления карты нафизическое устройство

Фактический результат: приложение запускается, не вылетает, просто нетна экране приложений он просто пуст, как будто данные json не передаются.

...