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我正在创建一个Android应用程序，该应用程序应该显示小部件中的项目列表（字符串），但出于某种原因，我无法使其工作。Android Widget不显示数据
代码
的widget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
}
}
小部件服务
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));
}
}
小工具视图适配器
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
个<?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>
在此先感谢
请仔细阅读[在什么情况下可能我在orde中添加了“紧急”或其他类似的短语来解决我的问题以获得更快的答案？]（// meta.stackoverflow.com/q/326569） - 总结是，这不是解决志愿者的理想方式，并且可能适得其反。请不要将这添加到您的问题。 – halfer