从应用程序启动小部件

Question

在您的应用程序中，使用此代码，我可以获得设备上安装的所有小部件的提供者列表：

    AppWidgetManager manager = AppWidgetManager.getInstance(this);
    List <ComponentName> cn = new ArrayList<>();
    List<AppWidgetProviderInfo> infoList = manager.getInstalledProviders();
    for (AppWidgetProviderInfo info : infoList) {
            cn.add(info.provider);
    }

如果我想启动其中一个小部件，有没有办法做到这一点？ （我想我可能需要 appWidgetId 但我不知道如何检索它）。

Answer 1

我从我非常旧的代码中复制了这个，所以它可能需要一些润色。它不是开箱即用的，但它包含向您展示如何操作的所有重要步骤。

1. 首先，您需要显示一个选择器以让用户选择小部件：

    private void createWidget() {
        try {
            awhId = // generate your unique ID
            awh = new AppWidgetHost(ctx, awhId);
            int appWidgetId = awh.allocateAppWidgetId();
            Intent pickIntent = new Intent(AppWidgetManager.ACTION_APPWIDGET_PICK);
            pickIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
            pickIntent = widgetAddEmptyData(pickIntent);
            startActivityForResult(pickIntent, ActivityMain.REQUEST_CODE_WIDGET_ADD);
        } catch (Exception e) {
            widgetError(e.getMessage(), e);
        }
    }


   public Intent widgetAddEmptyData(Intent pickIntent) {
        ArrayList<AppWidgetProviderInfo> customInfo = new ArrayList<AppWidgetProviderInfo>();
        pickIntent.putParcelableArrayListExtra(AppWidgetManager.EXTRA_CUSTOM_INFO, customInfo);
        ArrayList<Bundle> customExtras = new ArrayList<Bundle>();
        pickIntent.putParcelableArrayListExtra(AppWidgetManager.EXTRA_CUSTOM_EXTRAS, customExtras);
        return pickIntent;
    }

1. 您必须正确处理选择器的响应。

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        boolean processed = false;
        if (resultCode == Activity.RESULT_OK) {
            if (requestCode == ActivityMain.REQUEST_CODE_WIDGET_ADD) {
                widgetConfigure(data);
                processed = true;
            }
            if (requestCode == ActivityMain.REQUEST_CODE_WIDGET_CONFIGURED) {
                widgetSave(data);
                processed = true;
            }
        } else if (resultCode == Activity.RESULT_CANCELED && data != null) {
            int appWidgetId = data.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, -1);
            if (appWidgetId != -1) {
                try {
                    if (awh == null) {
                        awh = new AppWidgetHost(ctx, awhId);
                    }
                    awh.deleteAppWidgetId(appWidgetId);
                } catch (Exception e) {}
            }
        }
        if (!processed) {
            super.onActivityResult(requestCode, resultCode, data);
        }
    }

    private void widgetConfigure(Intent data) {
        try {
            Bundle extras = data.getExtras();
            int appWidgetId = extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID, -1);
            AppWidgetProviderInfo appWidgetInfo = wm.getAppWidgetInfo(appWidgetId);
            if (appWidgetInfo.configure != null) {
                Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_CONFIGURE);
                intent.setComponent(appWidgetInfo.configure);
                intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
                startActivityForResult(intent, ActivityMain.REQUEST_CODE_WIDGET_CONFIGURED);
            } else {
                widgetSave(data);
            }
        } catch (Exception e) {
            widgetError(e.getMessage(), e);
        }
    }

    private void widgetSave(final Intent data) {
        try {
            Bundle extras = data.getExtras();
            final int appWidgetId = extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID, -1);
            final AppWidgetProviderInfo appWidgetInfo = wm.getAppWidgetInfo(appWidgetId);

            // store information about created widget
            store(MyApps.WIDGET_HOST_ID, awhId);
            store(MyApps.WIDGET_ID, appWidgetId);
            store(MyApps.WIDGET_ICON, appWidgetInfo.icon);
            store(MyApps.WIDGET_PACKAGE, appWidgetInfo.provider.getPackageName());
            store(MyApps.WIDGET_CLASS, appWidgetInfo.provider.getClassName());
    }

1. 创建小部件并存储其数据后，即可托管它。

AppWidgetManager wm = AppWidgetManager.getInstance(getContext());
awh = new FaAppWidgetHost(getContext(), myAppItem.getWidgetHostId());
AppWidgetProviderInfo appWidgetInfo = wm.getAppWidgetInfo(myAppItem.getWidgetId());
AppWidgetHostView hostView = awh.createView(getContext(), myAppItem.getWidgetId(), appWidgetInfo);
hostView.setAppWidget(myAppItem.getWidgetId(), appWidgetInfo);
awh.startListening();