Android 위젯은 데이터를 표시하지 않습니다.

위젯에 항목 (문자열) 목록을 표시해야하는 Android 애플리케이션을 만들고 있지만 어떤 이유로 작동하지 않습니다.

암호

위젯 성분

    package com.example.vamshi.baking.Widget;

import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.widget.RemoteViews;

import com.example.vamshi.baking.R;
import com.example.vamshi.baking.Widget.Service.WidgetService;

/**
 * Implementation of App Widget functionality.
 */
public class Ingredients extends AppWidgetProvider {

    static void updateAppWidget(Context context, AppWidgetManager appWidgetManager,
                                int appWidgetId) {

        CharSequence widgetText = context.getString(R.string.appwidget_text);
        // Construct the RemoteViews object
        RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.ingredients);


        // Instruct the widget manager to update the widget
        appWidgetManager.updateAppWidget(appWidgetId, views);
    }

    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        // There may be multiple widgets active, so update all of them
        final int N = appWidgetIds.length;
        for (int i = 0; i<N; ++i) {
            RemoteViews remoteViews = updateWidgetListView(context,
                    appWidgetIds[i]);
            appWidgetManager.updateAppWidget(appWidgetIds[i],
                    remoteViews);
        }

    }

    private RemoteViews updateWidgetListView(Context context, int appWidgetId) {
        RemoteViews remoteViews = new RemoteViews(
                context.getPackageName(),R.layout.ingredients);

        //RemoteViews Service needed to provide adapter for ListView
        Intent svcIntent = new Intent(context, WidgetService.class);
        //passing app widget id to that RemoteViews Service
        svcIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
        //setting a unique Uri to the intent
        //don't know its purpose to me right now
        svcIntent.setData(Uri.parse(
                svcIntent.toUri(Intent.URI_INTENT_SCHEME)));
        //setting adapter to listview of the widget
        remoteViews.setRemoteAdapter(R.id.list_view_widget,
                svcIntent);

        return remoteViews;
    }

    @Override
    public void onEnabled(Context context) {
        // Enter relevant functionality for when the first widget is created
    }

    @Override
    public void onDisabled(Context context) {
        // Enter relevant functionality for when the last widget is disabled
    }
}

위젯 서비스

 package com.example.vamshi.baking.Widget.Service;

import android.appwidget.AppWidgetManager;
import android.content.Intent;
import android.widget.RemoteViewsService;

import com.example.vamshi.baking.Widget.WidgetViewAdapter;

/**
 * Created by Vamshi on 7/27/2017.
 */

public class WidgetService extends RemoteViewsService {

    @Override
    public RemoteViewsFactory onGetViewFactory(Intent intent) {
        int appWidgetID = intent.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID,
                AppWidgetManager.INVALID_APPWIDGET_ID);
        return (new WidgetViewAdapter(this.getApplicationContext(), intent));
    }
}

위젯보기 어댑터

    package com.example.vamshi.baking.Widget;

import android.appwidget.AppWidgetManager;
import android.content.Context;
import android.content.Intent;
import android.widget.RemoteViews;
import android.widget.RemoteViewsService;
import android.widget.Toast;

import com.example.vamshi.baking.Data.*;
import com.example.vamshi.baking.Data.Ingredients;
import com.example.vamshi.baking.R;
import com.example.vamshi.baking.Retrofit.IRecipe;
import com.example.vamshi.baking.Retrofit.RetrofitBuilder;

import java.util.ArrayList;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

/**
 * Created by Vamshi on 7/27/2017.
 */

public class WidgetViewAdapter implements RemoteViewsService.RemoteViewsFactory {

    Context context;
    ArrayList<Recipe> r;
    ArrayList<com.example.vamshi.baking.Data.Ingredients> i;
    private int appWidgetID;
    ArrayList<String> iList;

    public WidgetViewAdapter(Context c, Intent in){
        populate();
        this.context = c;
        appWidgetID = in.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID,
                AppWidgetManager.INVALID_APPWIDGET_ID);

    }

    private void populate() {

        IRecipe irecipie = RetrofitBuilder.Retrieve();
        final Call<ArrayList<Recipe>> recipie = irecipie.getRecipe();
        recipie.enqueue(new Callback<ArrayList<Recipe>>() {
            @Override
            public void onResponse(Call<ArrayList<Recipe>> call, Response<ArrayList<Recipe>> response) {
                r = response.body();
                i = r.get(0).getIngredients();
                for(int j = 0; j<=i.size(); j++){
                    iList.add(i.get(0).getIngredient());
                }
            }

            @Override
            public void onFailure(Call<ArrayList<Recipe>> call, Throwable t) {
                Toast.makeText(context, "No Internet Connection", Toast.LENGTH_SHORT).show();
            }
        });
    }

    @Override
    public void onCreate() {

        populate();
    }

    @Override
    public void onDataSetChanged() {

        IRecipe irecipie = RetrofitBuilder.Retrieve();
        final Call<ArrayList<Recipe>> recipie = irecipie.getRecipe();
        recipie.enqueue(new Callback<ArrayList<Recipe>>() {
            @Override
            public void onResponse(Call<ArrayList<Recipe>> call, Response<ArrayList<Recipe>> response) {
                r = response.body();
                i = r.get(0).getIngredients();
                for(int j = 0; j<=i.size(); j++){
                    iList.add(i.get(0).getIngredient());
                }
            }

            @Override
            public void onFailure(Call<ArrayList<Recipe>> call, Throwable t) {
                Toast.makeText(context, "No Internet Connection", Toast.LENGTH_SHORT).show();
            }
        });

    }

    @Override
    public void onDestroy() {

    }

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

    @Override
    public RemoteViews getViewAt(int position) {
        final RemoteViews remoteView = new RemoteViews(context.getPackageName(), R.layout.row);
        Ingredients in = i.get(position);
        remoteView.setTextViewText(R.id.text_for_widget, in.getIngredient());
        return remoteView;
    }

    @Override
    public RemoteViews getLoadingView() {
        return null;
    }

    @Override
    public int getViewTypeCount() {
        return 0;
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public boolean hasStableIds() {
        return false;
    }
}

명백한

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

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <service
        android:name=".WidgetService"
        android:permission="android.permission.BIND_REMOTEVIEWS" />

    <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=".UI.MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".UI.SecondScreenDetails" />
        <activity android:name=".UI.StepsActivity" />
        <activity android:name=".UI.SingleStepItem" />

        <receiver android:name=".Widget.BakingWidget">
            <intent-filter>
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
            </intent-filter>

            <meta-data
                android:name="android.appwidget.provider"
                android:resource="@xml/baking_widget_info" />
        </receiver>
        <service
            android:name=".Widget.Service.WidgetService"
            android:permission="android.permission.BIND_REMOTEVIEWS" />

        <activity android:name=".UI.MasterDetailFlow" />

        <receiver android:name=".Widget.Ingredients">
            <intent-filter>
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
            </intent-filter>

            <meta-data
                android:name="android.appwidget.provider"
                android:resource="@xml/ingredients_info" />
        </receiver>
    </application>

</manifest>

레이아웃 파일

Ingredients.xml

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="@dimen/widget_margin">

    <ListView
        android:id="@+id/list_view_widget"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </ListView>

</LinearLayout>

row.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="match_parent"
    android:orientation="vertical">

    <TextView
        android:id="@+id/text_for_widget"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>

미리 감사드립니다