java - 我应该在哪里设置逻辑以正确更新我的小部件？

Question

简介

我正在尝试制作一个学校小部件作为家庭作业。它是针对Android SO 完成的，并用 Java 编码。我对此还很陌生，所以我必须阅读大量文档，特别是来自他们的 Android 开发者主网站，我对 Android 开发不太感兴趣，所以非常欢迎快速而可靠的答案。

问题

我使用 Intent 从 WidgetConfig 类(一个 Activity)发送名称和 ID 到小部件。该数据应该从小部件布局写入 TextView 上，但由于某种原因它没有写入。

在下面的代码中，您可能会看到我的尝试，如果您从我将提供的存储库中测试了该程序，您将发现它没有正确更新。

所以我的问题是:

如何根据 Activity 发送的数据来更新我的小部件？

 public class FerrixWidget 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.ferrix_widget);
        //views.setTextViewText(R.id.appwidget_text, widgetText);

        // Instruct the widget manager to update the widget
        appWidgetManager.updateAppWidget(appWidgetId, views);

        RemoteViews spm = new RemoteViews(context.getPackageName(), R.layout.ferrix_widget);
        spm.setTextViewText(R.id.alumnoName, "plsupdate");
    }


    //This is called to update the App Widget at intervals defined by the updatePeriodMillis attribute
    // in the AppWidgetProviderInfo.
    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        // There may be multiple widgets active, so update all of them
        for (int appWidgetId : appWidgetIds) {
            updateAppWidget(context, appWidgetManager, appWidgetId);
        }



    }

    //This is called when an instance the App Widget is created for the first time.
    @Override
    public void onEnabled(Context context) {
        // Enter relevant functionality for when the first widget is created
        System.out.println("[INFO] FIRST INSTANCE CREATED");
    }

    //This is called when the last instance of your App Widget is deleted from the App Widget host.
    @Override
    public void onDisabled(Context context) {
        // Enter relevant functionality for when the last widget is disabled
    }

    //This is called for every broadcast and before each of the above callback methods.
    @Override
    public void onReceive(Context context, Intent intent) {

        RemoteViews controles = new RemoteViews(context.getPackageName(), R.layout.ferrix_widget);

        String alumnoName = intent.getStringExtra("Name"); //Gets the intent withthe key "Name"

        System.out.println("[INFO] Key: Name gets result: " + alumnoName);


        controles.setTextViewText(R.id.alumnoName, alumnoName);
        controles.setTextViewText(R.id.claseName, "DAM2");

        System.out.println("[INFO] Context: " + context);
        System.out.println("[INFO] Received: " + intent.getAction().toString());
    }
}

完整代码位于

https://gitlab.com/JonaFerre/ferrixwidget

我的目标

我希望当您在屏幕上设置小部件时，它会弹出一个配置屏幕(它已经这样做了)，然后您插入您的姓名和类(class)，该数据将发送到小部件(通过 Intent)，以便它与一天中的时间和其他一些内容一起书写和显示(一旦我正确解决了这个问题，我将添加这些内容)

注释:

• IDE:Android Studio
• 安卓:v15

Answer 1

您可以通过在小部件的 onReceive 中更新小部件来轻松解决此问题:

只需从配置 Activity 发送广播:

loginBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            SharedPreferences prefs = getSharedPreferences("WidgetPrefs", Context.MODE_PRIVATE);
            SharedPreferences.Editor editor = prefs.edit();
            editor.putString("msg_" + widgetId, nameInput.getText().toString()); //???
            editor.commit();

            //Actualizar el widget tras la config
            System.out.println("[INFO] Getting instance of WidgetConfig");
            AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(WidgetConfig.this);
            System.out.println("[INFO] Updating the widget");
            FerrixWidget.updateAppWidget(WidgetConfig.this, appWidgetManager, widgetId);


            //Devolver un buen OK
            Intent resultado = new Intent();
            resultado.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, widgetId);
            //System.out.println("[CONFIG INFO] Name text is: " + nameInput.getText().toString());
            resultado.putExtra("Name", nameInput.getText().toString());
            resultado.setAction("myUpdate");
            ComponentName componentName = new ComponentName(getApplicationContext(), FerrixWidget.class);
            resultado.setComponent(componentName);
            sendBroadcast(resultado);

            setResult(RESULT_OK, getIntent());
            finish();
            System.out.println("[INFO] OK devuelto!");
        }
 });

以及小部件的onReceive

public void onReceive(Context context, Intent intent) {

    if(intent.getAction() != null && intent.getAction().equals("myUpdate")) {
        RemoteViews controles = new RemoteViews(context.getPackageName(), R.layout.ferrix_widget);

        String alumnoName = intent.getStringExtra("Name"); //Gets the intent withthe key "Name"
        int id = intent.getIntExtra(
                AppWidgetManager.EXTRA_APPWIDGET_ID,
                AppWidgetManager.INVALID_APPWIDGET_ID);


        System.out.println("[INFO] Key: Name gets result: " + alumnoName);


        controles.setTextViewText(R.id.alumnoName, alumnoName);
        controles.setTextViewText(R.id.claseName, "DAM2");
        AppWidgetManager.getInstance(context).updateAppWidget(id, controles);

        System.out.println("[INFO] Context: " + context);
        System.out.println("[INFO] Received: " + intent.getAction().toString());
    } else {
        super.onReceive(context, intent);
    }
}

但更好的方法是将数据和小部件的 ID 保存在 db/preference 中，然后在 onUpdate 中更新小部件一侧。

请阅读official doc 。有很多东西可以帮助您。