我已经看过并阅读了很多教程，但是其中没有一个带有图像的StackView。目前，我的小部件具有背景色，但是什么也没显示！
This is when i run the emulator!
以下是带有代码的活动：
如您所见，我传递了一个Automoviles类对象，该对象用于填充RecyclerView。
public class AdapterViewCars extends RecyclerView.Adapter<AdapterViewCars.RecyclerViewHolder>{
private List<Automoviles> automovilesList;
private Context context;
public AdapterViewCars(Context context, List<Automoviles> itemList){
this.automovilesList=itemList;
this.context=context;
}
@NonNull
@Override
public RecyclerViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_carros,null);
RecyclerViewHolder rcv=new RecyclerViewHolder(view);
return rcv;
}
@Override
public void onBindViewHolder(@NonNull RecyclerViewHolder holder, final int position) {
Automoviles automoviles=automovilesList.get(position);
holder.txtTitulo.setText(automoviles.getMarca());
Glide.with(context)
.load(automoviles.getImagen())
.into(holder.imgCarro);
Intent imageIntent=new Intent(context, CarWidget.class);
imageIntent.putExtra("widget_image",automoviles);
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Automoviles model = automovilesList.get(position);
Intent intent =new Intent(context, CarDetailView.class);
intent.putExtra("ListaVehiculos",model);
context.startActivity(intent);
}
});
}
@Override
public int getItemCount() {
return this.automovilesList.size();
}
public class RecyclerViewHolder extends RecyclerView.ViewHolder {
@BindView(R.id.imgCarro)
ImageView imgCarro;
@BindView(R.id.txttitulo)
TextView txtTitulo;
public RecyclerViewHolder(@NonNull View itemView) {
super(itemView);
ButterKnife.bind(this,itemView);
}
}
}
现在在这项服务中，我尝试获取图像的意图
public class WidgetService extends RemoteViewsService {
SvAutomoviles svAutomoviles;
List<Automoviles> mArraylistAutomoviles;
FirebaseDatabase mFirebaseDatabase;
DatabaseReference mDatabaseReference;
@Override
public RemoteViewsFactory onGetViewFactory(Intent intent) {
return new WidgetItemFactory(getApplicationContext(),intent);
}
class WidgetItemFactory implements RemoteViewsFactory{
private Context context;
private int appWidgetId;
String marca;
String imagen;
List<Automoviles> mAutos;
Automoviles automoviles;
WidgetItemFactory(Context context,Intent intent){
this.context=context;
this.appWidgetId=intent.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID,
AppWidgetManager.INVALID_APPWIDGET_ID);
}
@Override
public void onCreate() {
mFirebaseDatabase=FirebaseDatabase.getInstance();
mDatabaseReference=FirebaseDatabase.getInstance().getReference();
mArraylistAutomoviles=new ArrayList<>();
Query query = mDatabaseReference.child(AppModel.Automoviles);
query.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
Automoviles automoviles = new Automoviles();
SvAutomoviles svAutomoviles=new SvAutomoviles();
/**
* Here you Create another Automoviles object to setLista_de_automoviles
*
*/
automoviles.setLista_de_automoviles(svAutomoviles.GetAutomoviles(dataSnapshot));
mArraylistAutomoviles=automoviles.getLista_de_automoviles();
marca=automoviles.getMarca();
imagen=automoviles.getImagen();
/**
* Then you get the arraylist in the adapters constructor which receives as parameters
* AdapterViewCars(context,List<Automoviles)
*/
AdapterViewCars adapterViewCars=new AdapterViewCars(getApplicationContext(), automoviles.getLista_de_automoviles());
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
@Override
public void onDataSetChanged() {
}
@Override
public void onDestroy() {
}
@Override
public int getCount() {
return mArraylistAutomoviles.size();
}
@Override
public RemoteViews getViewAt(int position) {
RemoteViews views=new RemoteViews(context.getPackageName(), R.layout.widget_item);
views.setTextViewText(R.id.textView, (CharSequence) mArraylistAutomoviles.get(position));
mAutos=new ArrayList<>();
Automoviles autos= mArraylistAutomoviles.get(position);
Intent intent=new Intent();
automoviles=intent.getExtras().getParcelable("widget_image");
String autoImagen=automoviles.getImagen();
String image=autos.getImagen();
Intent imageIntent=new Intent();
imageIntent.putExtra("widget_image",image);
return views;
}
@Override
public RemoteViews getLoadingView() {
return null;
}
@Override
public int getViewTypeCount() {
return 1;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public boolean hasStableIds() {
return true;
}
}
}
这是我的小部件配置活动：
public class CarWidgetConfigureActivity extends Activity {
private static final String PREFS_NAME = "com.example.mac.udacitycapstonefinalproject.Widget.CarWidget";
private static final String PREF_PREFIX_KEY = "appwidget_";
int mAppWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID;
EditText mAppWidgetText;
View.OnClickListener mOnClickListener = new View.OnClickListener() {
public void onClick(View v) {
final Context context = CarWidgetConfigureActivity.this;
// When the button is clicked, store the string locally
String widgetText = mAppWidgetText.getText().toString();
saveTitlePref(context, mAppWidgetId, widgetText);
// It is the responsibility of the configuration activity to update the app widget
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
CarWidget.updateAppWidget(context, appWidgetManager, mAppWidgetId);
// Make sure we pass back the original appWidgetId
Intent resultValue = new Intent();
resultValue.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, mAppWidgetId);
setResult(RESULT_OK, resultValue);
finish();
}
};
public CarWidgetConfigureActivity() {
super();
}
// Write the prefix to the SharedPreferences object for this widget
static void saveTitlePref(Context context, int appWidgetId, String text) {
SharedPreferences.Editor prefs = context.getSharedPreferences(PREFS_NAME, 0).edit();
prefs.putString(PREF_PREFIX_KEY + appWidgetId, text);
prefs.apply();
}
// Read the prefix from the SharedPreferences object for this widget.
// If there is no preference saved, get the default from a resource
static String loadTitlePref(Context context, int appWidgetId) {
SharedPreferences prefs = context.getSharedPreferences(PREFS_NAME, 0);
String titleValue = prefs.getString(PREF_PREFIX_KEY + appWidgetId, null);
if (titleValue != null) {
return titleValue;
} else {
return context.getString(R.string.appwidget_text);
}
}
static void deleteTitlePref(Context context, int appWidgetId) {
SharedPreferences.Editor prefs = context.getSharedPreferences(PREFS_NAME, 0).edit();
prefs.remove(PREF_PREFIX_KEY + appWidgetId);
prefs.apply();
}
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
// Set the result to CANCELED. This will cause the widget host to cancel
// out of the widget placement if the user presses the back button.
setResult(RESULT_CANCELED);
setContentView(R.layout.car_widget_configure);
mAppWidgetText = (EditText) findViewById(R.id.appwidget_text);
findViewById(R.id.add_button).setOnClickListener(mOnClickListener);
// Find the widget id from the intent.
Intent intent = getIntent();
Bundle extras = intent.getExtras();
if (extras != null) {
mAppWidgetId = extras.getInt(
AppWidgetManager.EXTRA_APPWIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID);
}
// If this activity was started with an intent without an app widget ID, finish with an error.
if (mAppWidgetId == AppWidgetManager.INVALID_APPWIDGET_ID) {
finish();
return;
}
mAppWidgetText.setText(loadTitlePref(CarWidgetConfigureActivity.this, mAppWidgetId));
}
}
这是我的小部件提供商：
public class CarWidget extends AppWidgetProvider {
String image="";
static void updateAppWidget(Context context, AppWidgetManager appWidgetManager,
int appWidgetId) {
CharSequence widgetText = CarWidgetConfigureActivity.loadTitlePref(context, appWidgetId);
// Construct the RemoteViews object
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.car_widget);
views.setTextViewText(R.id.appwidget_text, widgetText);
// Instruct the widget manager to update the widget
appWidgetManager.updateAppWidget(appWidgetId, views);
}
@Override
public void onReceive(Context context, Intent intent) {
super.onReceive(context, intent);
image = intent.getStringExtra("widget_image");
}
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
for (int i = 0; i < appWidgetIds.length; ++i) {
RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.car_widget);
// set intent for widget service that will create the views
Intent serviceIntent = new Intent(context, WidgetService.class);
serviceIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetIds[i]);
serviceIntent.setData(Uri.parse(serviceIntent.toUri(Intent.URI_INTENT_SCHEME))); // embed extras so they don't get ignored
remoteViews.setRemoteAdapter(appWidgetIds[i], R.id.widget_stack_view, serviceIntent);
// set intent for item click (opens main activity)
Intent viewIntent = new Intent(context, MainActivity.class);
viewIntent.setAction(MainActivity.ACTIVITY_SERVICE);
viewIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetIds[i]);
viewIntent.setData(Uri.parse(viewIntent.toUri(Intent.URI_INTENT_SCHEME)));
PendingIntent viewPendingIntent = PendingIntent.getActivity(context, 0, viewIntent, 0);
remoteViews.setPendingIntentTemplate(R.id.widget_stack_view
, viewPendingIntent);
// update widget
appWidgetManager.updateAppWidget(appWidgetIds[i], remoteViews);
AppWidgetTarget awt = new AppWidgetTarget(context, R.id.widget_image_item, remoteViews, appWidgetIds) {
@Override
public void onResourceReady(Bitmap resource, Transition<? super Bitmap> transition) {
super.onResourceReady(resource, transition);
}
};
RequestOptions options = new RequestOptions().
override(300, 300).placeholder(R.drawable.carapp_logo).error(R.drawable.carapp_logo);
Glide.with(context.getApplicationContext())
.asBitmap()
.load(image)
.apply(options)
.into(awt);
}
super.onUpdate(context, appWidgetManager, appWidgetIds);
}
@Override
public void onDeleted(Context context, int[] appWidgetIds) {
// When the user deletes the widget, delete the preference associated with it.
// for (int appWidgetId : appWidgetIds) {
// CarWidgetConfigureActivity.deleteTitlePref(context, appWidgetId);
// }
super.onDeleted(context,appWidgetIds);
}
@Override
public void onEnabled(Context context) {
// Enter relevant functionality for when the first widget is created
super.onEnabled(context);
}
@Override
public void onDisabled(Context context) {
// Enter relevant functionality for when the last widget is disabled
super.onDisabled(context);
}
}
我试图以两种方式从适配器到CarWidget类的意图中检索它，两者都返回null。我对这些小部件感到非常困惑，我可能还认为其他提供的小部件类存在问题。