Question

我有一个android小部件，每10分钟从服务器获取一次数据，并在屏幕上显示它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将事件处理程序添加到应用程序中的按钮非常容易，但是我找不到窗口小部件的示例我想帮助为小部件中的按钮单击添加一个功能。

Answer 1

以下是一个应该提供帮助的示例：

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);
    }
}

Answer 2

我发现了怎么做。
在＆gt;中向AndroidManifest.xml文件添加操作<receiver><intent-filter>代码：

<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，检查操作名称：

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

    }

Answer 3

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"));

也更喜欢网址：

How to correctly handle click events on Widget

如果您以不同的方式解决了这个问题，请将此作为答案提供

Answer 4

这是另一个有以下好处的答案：

它处理所有App Widget实例（用户可能在屏幕上有各种配置/大小的窗口小部件的多个实例）。所有实例的编码都是官方文档规定的内容。请参阅Guide > App Widgets > Using the AppWidgetProvider Class ，向下滚动到＆＃34; ExampleAppWidgetProvider＆＃34;的代码示例。
onReceive中的主力代码实际上调用了onUpdate（因此减少了代码重复）。
onUpdate(Context context)中的代码是一般化的，因此可以将其放入任何AppWidgetProvider子类中。

代码：

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

Widget update button example. Simple counting.

这基于@Kels，@ SharonHaimPour和@ Erti-ChrisEelmaa的getPendingSelfIntent作品。

它还建立在Android-er > 2010-10-19 > Update Widget in onReceive() method（不是我）的基础上，它演示了如何在App Widget实例的基础上从onReceive调用onUpdate。我将该代码编成通用并将其包装在callOnUpdate。

中

Answer 5

在 pendingIntent 中，我们还可以添加额外的属性 appWidgetId 以便稍后在 onReceive 中重用它来更新小部件点击的小部件实例

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>

Answer 6

我尝试了Sharon Haim Pour above建议的解决方案，但从未按过按钮就调用AppWidgetProvider类中的onReceive（）方法。

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 );

经过研究，我可以通过更新以下代码来解决问题：

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 );

别忘了放在下面：

appWidgetManager.updateAppWidget(appWidgetId, views);

Android小部件的按钮单击事件

6 个答案: