Android小部件的按钮单击事件

Question

我有一个android小部件,每隔10分钟从服务器获取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功能.

Answer 1

这是一个应该帮助的例子:

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);
    }
}

Answer 2

我发现了怎么做.在> 标记中
向AndroidManifest.xml文件添加操作<receiver><intent-filter>:

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

在提供程序中添加与操作名称匹配的常量:

public static String WIDGET_BUTTON = "MY_PACKAGE_NAME.WIDGET_BUTTON";

在该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

这是另一个答案,具有以下好处:

• 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.请参阅指南>应用程序窗口小部件>使用AppWidgetProvider类,向下滚动到"ExampleAppWidgetProvider"的代码示例.
• onReceive实际调用的主力代码onUpdate(因此减少了代码重复).
• 代码输入onUpdate(Context context)是通用的,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

这建立在getPendingSelfIntent@Kels,@ SharonHaimPour和@ Erti-ChrisEelmaa 的工作之上.

它还基于Android-er> 2010-10-19> onReceive()方法(而不是我)中的Update Widget构建,其中演示了如何在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callOnUpdate.

Answer 4

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"));

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