Android小部件ListView项目点击不起作用

Posted 2023-04-15

【中文标题】Android小部件ListView项目点击不起作用

【英文标题】：Android widget ListView item clicks not working

【发布时间】：2019-01-13 09:32:29

【问题描述】：

所以我试图设置一个带有列表的小部件，但点击不起作用，所以我知道要做到这一点，我需要一个模板待定意图，因为单个项目不能有自己的，然后添加到待定意图使用填充意图的模板，我已将所有这些添加到我的应用程序中，但它仍然无法正常工作，我遵循了建议 here 和 here 但是当我点击一个项目时，它刚刚突出显示它有注册了一次点击，但我确实得到了这个 日志猫

08-06 17:02:08.001 2163-3666/? W/Binder: Binder call failed.
java.lang.NullPointerException: Attempt to read from field 
'com.android.server.appwidget.AppWidgetServiceImpl$ProviderId 
com.android.server.appwidget.AppWidgetServiceImpl$Provider.id' 
on a null object reference
    at 
com.android.server.appwidget.AppWidgetServiceImpl$AppWidgetManagerLocal
.getHostedWidgetPackages(AppWidgetServiceImpl.java:4800)
    at 
com.android.server.accessibility.AccessibilityManagerService$SecurityPolicy
.resolveValidReportedPackageLocked(AccessibilityManagerService.java:4637)
    at com.android.server.accessibility.AccessibilityManagerService
.sendAccessibilityEvent(AccessibilityManagerService.java:531)
    at android.view.accessibility.IAccessibilityManager$Stub
.onTransact(IAccessibilityManager.java:71)
    at android.os.Binder.execTransact(Binder.java:690)

这是我的代码，我的 onUpdate 方法调用了一个静态更新小部件方法，该方法定义了我的模板待处理意图，以及我的 onReceive 方法

AppWidgetProvider

public class MessageMeAppWidget extends AppWidgetProvider 
private static final String TAG = "MsgMeWdgt";

@Override
public void onReceive(Context context, Intent intent) 
    AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
    if (intent.getAction().equals(Constants.LAUNCH_ACTIVITY)) 
        int appWidgetId = intent.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID,
                AppWidgetManager.INVALID_APPWIDGET_ID);

        //String recipientId =  intent.getStringExtra(Constants.FS_ID);
        //String recipientName =  intent.getStringExtra(Constants.FS_NAME);

        Intent i = new Intent(context, MessageListActivity.class);
        Bundle b = new Bundle();
        //b.putString(Constants.FS_ID, recipientId);
        //b.putString(Constants.FS_ID, recipientName);
        i.putExtras(b);
        Bundle bundle = intent.getExtras();
        String toastText = "position is " + bundle.getInt(Constants.LAUNCH_ACTIVITY);
        Toast.makeText(context,toastText,Toast.LENGTH_SHORT).show();
        //context.startActivity(i);
    else if(intent.getAction().equals(Constants.DONT_LAUNCH_ACTIVITY))
        //Toast.makeText(context,"",Toast.LENGTH_SHORT).show();
    
    super.onReceive(context, intent);


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

    SharedPreferences sharedPreferences = context.getSharedPreferences(Constants.SHARED_PREFS,Context.MODE_PRIVATE);
    boolean userSignedIn = sharedPreferences.getBoolean(Constants.SIGNED_IN, false);
    if (userSignedIn)
        //move everything in here after i know its working
    
    Intent intent = new Intent(context, MessagingService.class);
    intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
    intent.setData(Uri.parse(intent.toUri(Intent.URI_INTENT_SCHEME)));
    RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget_list_view);
    //populates data
    remoteViews.setRemoteAdapter(R.id.widget_list,intent);
    //remoteViews.setRemoteAdapter(appWidgetId, R.id.widget_list, intent);
    remoteViews.setEmptyView(R.id.widget_list,R.id.empty);

    Intent launchIntent = new Intent(context, WidgetAdapter.class);
    launchIntent.setAction(Constants.LAUNCH_ACTIVITY);
    launchIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
    intent.setData(Uri.parse(intent.toUri(Intent.URI_INTENT_SCHEME)));
    PendingIntent launchPendingIntent = PendingIntent.getBroadcast(context, 0, launchIntent,
            PendingIntent.FLAG_UPDATE_CURRENT);

    remoteViews.setPendingIntentTemplate(R.id.widget_list, launchPendingIntent);
    appWidgetManager.updateAppWidget(appWidgetId, remoteViews);



@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) 
    // There may be multiple widgets active, so update all of them
           Log.d(TAG,"on update");
    for (int appWidgetId : appWidgetIds) 
        updateAppWidget(context, appWidgetManager, appWidgetId);
    

那我的widget服务是标准的

public class MessagingService extends RemoteViewsService 
private String TAG = "MsgSrvc";
@Override
public RemoteViewsFactory onGetViewFactory(Intent intent) 
    Log.d(TAG,"item clicked");
    return new WidgetAdapter(this.getApplicationContext(), intent);
  

然后在我的小部件适配器的 getViewAt 方法中，我像这样填写我的填充意图

    Bundle extras = new Bundle();
    extras.putInt(Constants.LAUNCH_ACTIVITY, position);
    Intent fillInIntent = new Intent();
    fillInIntent.putExtras(extras);
    remoteViews.setOnClickFillInIntent(R.id.holder, fillInIntent);

在我的清单中，我正在注册我的小部件服务和接收器

<receiver android:name="com.sealstudios.aimessage.MessageMeAppWidget">
        <intent-filter>
            <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
        </intent-filter>

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

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

任何帮助表示赞赏

【参考方案1】：

我解决了这个问题，因为意图指向了错误的类，所以

Intent launchIntent = new Intent(context, WidgetAdapter.class); 

应该是

Intent launchIntent = new Intent(context, MessageMeAppWidget.class);