Question

我正在创建一个Android应用程序，该应用程序应该在窗口小部件中显示项目列表（字符串），但由于某种原因，我无法使其工作。

代码

小部件成分

    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
    }
}

小工具服务

 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));
    }
}

小部件视图适配器

    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;
    }
}

清单

    <?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>

布局文件

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>

提前致谢

Answer 1

在您的窗口小部件视图适配器中，使getViewTypeCount返回1.

@Override
public int getViewTypeCount() {
    return 1;
}

此方法提供提供该工厂的视图类型的数量。最好在IntentService中进行网络调用并传递响应体在ViewsViewFactory可以填充成分列表之后，RemoteViewsService的意图和此服务在ViewsFactory中传递该意图。

Answer 2

我的目标是在小部件中显示字符串列表并且因为窗口小部件不允许显示回收器视图我不得不去列表视图在找出问题所在的方面我遇到了很多麻烦但我得到了一篇精彩的文章，它完美展示了如何做到这一点我在这里发布链接，所以如果你需要任何帮助可以参考这个

https://dharmangsoni.blogspot.in/2014/03/collection-widget-with-event-handling.html

Android Widget不显示数据

2 个答案: