48

我有一个 android 小部件，它每 10 分钟从服务器获取数据并将其显示在屏幕上。
我想为该小部件添加一个“刷新”按钮。
当用户单击该按钮时，我想运行从服务器获取信息的方法。
向应用程序中的按钮添加事件处理程序非常容易，但是我找不到小部件的示例。
我想获得一些帮助，将功能添加到小部件中的按钮单击。

4

7 回答 7

79

这是一个应该有帮助的例子：

package com.automatic.widget;

import android.app.PendingIntent;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.widget.RemoteViews;

public class Widget extends AppWidgetProvider {

    private static final String SYNC_CLICKED    = "automaticWidgetSyncButtonClick";

    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        RemoteViews remoteViews;
        ComponentName watchWidget;

        remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget_layout);
        watchWidget = new ComponentName(context, Widget.class);

        remoteViews.setOnClickPendingIntent(R.id.sync_button, getPendingSelfIntent(context, SYNC_CLICKED));
        appWidgetManager.updateAppWidget(watchWidget, remoteViews);
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        super.onReceive(context, intent);

        if (SYNC_CLICKED.equals(intent.getAction())) {

            AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);

            RemoteViews remoteViews;
            ComponentName watchWidget;

            remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget_layout);
            watchWidget = new ComponentName(context, Widget.class);

            remoteViews.setTextViewText(R.id.sync_button, "TESTING");

            appWidgetManager.updateAppWidget(watchWidget, remoteViews);

        }
    }

    protected PendingIntent getPendingSelfIntent(Context context, String action) {
        Intent intent = new Intent(context, getClass());
        intent.setAction(action);
        return PendingIntent.getBroadcast(context, 0, intent, 0);
    }
}
于 2013-05-29T13:05:36.723 回答
49

我发现了如何做到这一点。在 >标记 中
向文件添加操作：AndroidManifest.xml<receiver><intent-filter>

<action android:name="MY_PACKAGE_NAME.WIDGET_BUTTON" />

在提供程序中添加一个与操作名称匹配的常量： 

public static String WIDGET_BUTTON = "MY_PACKAGE_NAME.WIDGET_BUTTON";

在onUpdate()方法中添加与操作匹配的待处理意图：

Intent intent = new Intent(WIDGET_BUTTON);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
views.setOnClickPendingIntent(R.id.MY_BUTTON_ID, pendingIntent );

最后，在 onRecieve() 方法中，检查动作名称：

 if (WIDGET_BUTTON.equals(intent.getAction())) {
//your code here

    }
于 2013-02-18T09:10:23.177 回答
12

这是另一个具有以下好处的答案：

  • 它处理所有 App Widget 实例（用户可能在您的屏幕上有多个不同配置/大小的小部件实例）。所有实例的编码都是官方文档规定的。请参阅指南 > 应用小部件 > 使用 AppWidgetProvider 类，向下滚动到“ExampleAppWidgetProvider”的代码示例。
  • onReceive实际调用中的主力代码onUpdate（因此您可以减少代码重复）。
  • 中的代码onUpdate(Context context)是通用的，因此可以将其放入任何 AppWidgetProvider 子类中。

编码：

public class MyWidget extends AppWidgetProvider {

    private static final String ACTION_UPDATE_CLICK = 
              "com.example.myapp.action.UPDATE_CLICK";

    private static int mCount = 0;

    private static String getMessage() {
        return String.valueOf(mCount++);
    }

    private PendingIntent getPendingSelfIntent(Context context, String action) {
        // An explicit intent directed at the current class (the "self").
        Intent intent = new Intent(context, getClass());
        intent.setAction(action);
        return PendingIntent.getBroadcast(context, 0, intent, 0);
    }

    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager,
                         int[] appWidgetIds) {
        super.onUpdate(context, appWidgetManager, appWidgetIds);

        String message = getMessage();

        // Loop for every App Widget instance that belongs to this provider.
        // Noting, that is, a user might have multiple instances of the same
        // widget on
        // their home screen.
        for (int appWidgetID : appWidgetIds) {
            RemoteViews remoteViews = new RemoteViews(context.getPackageName(),
                                                      R.layout.my_widget);

            remoteViews.setTextViewText(R.id.textView_output, message);
            remoteViews.setOnClickPendingIntent(R.id.button_update,
                                                getPendingSelfIntent(context,
                                                           ACTION_UPDATE_CLICK)
            );

            appWidgetManager.updateAppWidget(appWidgetID, remoteViews);

        }
    }

    /**
     * A general technique for calling the onUpdate method,
     * requiring only the context parameter.
     *
     * @author John Bentley, based on Android-er code.
     * @see <a href="http://android-er.blogspot.com
     * .au/2010/10/update-widget-in-onreceive-method.html">
     * Android-er > 2010-10-19 > Update Widget in onReceive() method</a>
     */
    private void onUpdate(Context context) {
        AppWidgetManager appWidgetManager = AppWidgetManager.getInstance
                (context);

        // Uses getClass().getName() rather than MyWidget.class.getName() for
        // portability into any App Widget Provider Class
        ComponentName thisAppWidgetComponentName =
                new ComponentName(context.getPackageName(),getClass().getName()
        );
        int[] appWidgetIds = appWidgetManager.getAppWidgetIds(
                thisAppWidgetComponentName);
        onUpdate(context, appWidgetManager, appWidgetIds);
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        super.onReceive(context, intent);

        if (ACTION_UPDATE_CLICK.equals(intent.getAction())) {
            onUpdate(context);
        }
    }

}

小部件看起来像这样

小部件更新按钮示例。 简单计数。

这建立在getPendingSelfIntent@Kels、@SharonHaimPour 和@Erti-ChrisEelmaa 的工作之上。

它还建立在Android-er > 2010-10-19 > Update Widget in onReceive() 方法（不是我）的基础上，其中演示了如何在 App Widget 实例基础上从 onReceive 调用 onUpdate。我使该代码通用并将其包装在callOnUpdate.

于 2014-07-22T02:48:26.603 回答
10 
protected PendingIntent getPendingSelfIntent(Context context, String action) {
    Intent intent = new Intent(context, getClass());
    intent.setAction(action);
    return PendingIntent.getBroadcast(context, 0, intent, 0);
}

views.setOnClickPendingIntent(R.id.Timm, getPendingSelfIntent(context,
                              "ham"));

也更喜欢 URL ：

如何正确处理 Widget 上的点击事件

如果您以其他方式解决了它，请提供此作为答案

于 2013-02-10T13:14:06.997 回答
1

在 中pendingIntent，我们还可以放置额外的属性appWidgetId以便稍后重用它onReceive来更新小部件单击的小部件实例

class ExampleAppWidgetProvider : AppWidgetProvider() {

    override fun onUpdate(context: Context, appWidgetManager: AppWidgetManager, appWidgetIds: IntArray {

        appWidgetIds.forEach { appWidgetId ->
            Log.e("TAG", "onUpdate $appWidgetId")
            val pendingRefreshClickIntent: PendingIntent = Intent(context, javaClass).let {
                it.action = ACTION_REFRESH_CLICK
                it.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId)
                return@let PendingIntent.getBroadcast(
                    context,
                    appWidgetId, // click in all instances widget will work well (base on Alireza Mirian comment in the top answer)
                    it,
                    PendingIntent.FLAG_UPDATE_CURRENT
                )
            }

            val views = RemoteViews(
                context.packageName,
                R.layout.example_appwidget
            )
            views.setOnClickPendingIntent(R.id.button_refresh, pendingRefreshClickIntent)

            appWidgetManager.updateAppWidget(appWidgetId, views)
        }
    }

    override fun onReceive(context: Context?, intent: Intent?) {
        super.onReceive(context, intent)
        Log.i("TAG", "onReceive " + intent?.action)

        if (intent?.action == ACTION_REFRESH_CLICK) {
            val appWidgetId = intent.extras?.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID) ?: return
            Log.i("TAG", "onReceive appWidgetId $appWidgetId")

            val appWidgetManager = AppWidgetManager.getInstance(context)
            val views = RemoteViews(context!!.packageName, R.layout.example_appwidget)

            views.setTextViewText(R.id.text_data, "a " + (Math.random() * 9).roundToInt())
            appWidgetManager.updateAppWidget(appWidgetId, views)
        }
    }

    companion object {
        private const val ACTION_REFRESH_CLICK =  "com.example.androidwidgetbuttonclick.action.ACTION_REFRESH_CLICK"
    }
}

小部件初始布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <TextView
        android:id="@+id/text_data"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="AA"
        android:textSize="20sp" />

    <Button
        android:id="@+id/button_refresh"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Refresh" />
</LinearLayout>
于 2021-02-17T03:47:53.743 回答
0

我尝试了上面Sharon Haim Pour 建议的解决方案，但我在 AppWidgetProvider 类中的 onReceive() 方法从未在按钮按下时被调用。

Intent intent = new Intent(WIDGET_BUTTON);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, 
PendingIntent.FLAG_UPDATE_CURRENT);
views.setOnClickPendingIntent(R.id.MY_BUTTON_ID, pendingIntent );

经过一番研究，我可以通过更新代码来解决问题，如下所示：

Intent intent = new Intent(context, MY_APPWIDGETPROVIDER_CLASS.class);
intent.setAction(WIDGET_BUTTON);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, 
PendingIntent.FLAG_UPDATE_CURRENT);
views.setOnClickPendingIntent(R.id.MY_BUTTON_ID, pendingIntent );

不要忘记在下面放：

appWidgetManager.updateAppWidget(appWidgetId, views);
于 2020-09-28T04:15:47.960 回答
0

与此处使用的其他答案不同onReceive()，我发现在onUpdate().

官方的 Android codelab Advanced Android 02.1: App widgets提供了这个解决方案。Java 中的示例代码。在这里，我介绍了 Kotlin 中的解决方案。

class MyAppWidgetProvider : AppWidgetProvider() {

    override fun onUpdate(
        context: Context?,
        appWidgetManager: AppWidgetManager?,
        appWidgetIds: IntArray?
    ) {
        appWidgetIds?.forEach { appWidgetId ->
            val views = RemoteViews(
                context?.packageName,
                R.layout.appwidget
            )
            // Coroutine to perform background IO task.
            GlobalScope.launch(Dispatchers.IO) {
                // Suspend function.
                val apiData = Api.retrofitService.getData()
                updateWidgetUI(views, apiData)
                context?.let {
                    views.setOnClickPendingIntent(
                        R.id.widget_button,
                        getUpdatePendingIntent(it, appWidgetId)
                    )
                }
                appWidgetManager?.updateAppWidget(appWidgetId, views)
            }
        }
    }

    private fun updateWidgetUI(views: RemoteViews, apiData: ApiData){
        views.apply {
            setTextViewText(R.id.widget_value_textview, apiData.value)
            setTextViewText(
                R.id.widget_last_updated_value_textview,
                DateFormat.getTimeInstance(DateFormat.MEDIUM).format(Date())
            )
        }
    }

    private fun getUpdatePendingIntent(context: Context, appWidgetId: Int): PendingIntent {
        val intent = Intent(context, MyAppWidgetProvider::class.java).also {
            it.action = AppWidgetManager.ACTION_APPWIDGET_UPDATE
            // It's very important to use intArrayOf instead of arrayOf,
            // as a primitive int array is expected.
            it.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, intArrayOf(appWidgetId))
        }
        // Set the immutability flag for Android 12.
        val flags = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            PendingIntent.FLAG_IMMUTABLE or PendingIntent.FLAG_UPDATE_CURRENT
        } else {
            PendingIntent.FLAG_UPDATE_CURRENT
        }
        return PendingIntent.getBroadcast(
            context,
            appWidgetId,
            intent,
            flags
        )
    }
// No need for onReceive().
}

这里的关键是使用内置AppWidgetManager.ACTION_APPWIDGET_UPDATE操作而不是自定义操作。

于 2021-09-05T14:08:15.773 回答