Android:可点击的 ImageView 小部件

Question

我想制作一个非常简单的小部件:

它必须只包含一个 ImageView

1) 在传入的短信中它应该改变图像

2)点击它也应该改变图像

我尝试使用 ImageButton 实现它但失败了:在接收到的短信事件中更改图像时出现问题:新图像的缩放比例错误。

无论如何，现在我想制作一个没有其他任何东西的 ImageView。

问题是我无法处理 onClick 事件:

我有一个正在运行的服务，它应该处理所有事件:收到短信并点击:

小部件提供者:

public class MyWidgetProvider extends AppWidgetProvider {
    @Override
    public void onDisabled(Context context) {
        context.stopService(new Intent(context, UpdateService.class));
        super.onDisabled(context);
    }

    @Override
    public void onEnabled(Context context) {
        super.onEnabled(context);
        Intent intent = new Intent(context, UpdateService.class);
        context.startService(intent);
    }

    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager,
                     int[] appWidgetIds) {
        super.onUpdate(context, appWidgetManager, appWidgetIds);
        for (int i = 0; i < appWidgetIds.length; i++) {
            int appWidgetId = appWidgetIds[i];

            RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.main);
            Intent widgetClickIntent = new Intent(context, UpdateService.class);
            widgetClickIntent.setAction(UpdateService.ACTION_ON_CLICK);
            PendingIntent pendingIntentViewClick = PendingIntent.getService(context, 0, widgetClickIntent, 0);
            remoteViews.setOnClickPendingIntent(R.id.widget_imageview, pendingIntentViewClick);
            appWidgetManager.updateAppWidget(appWidgetId, remoteViews);
        }
    }
}

服务:

public class UpdateService extends Service {
    static final String ACTION_SMS_RECEIVED = "android.provider.Telephony.SMS_RECEIVED";
    static final String ACTION_ON_CLICK = "android.MyWidget.ACTION_ON_CLICK";

    private final static IntentFilter intentFilter;

    static {
        intentFilter = new IntentFilter();
        intentFilter.addAction(ACTION_SMS_RECEIVED);
        intentFilter.addAction(ACTION_ON_CLICK);
    }


    public final BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            final String action = intent.getAction();

            if (action.equals(ACTION_SMS_RECEIVED)) {
                reactOnSms(context);
            }
            if (action.equals(ACTION_ON_CLICK)) {
                onCLick(context);
            }
        }
    };

    @Override
    public void onCreate() {
        super.onCreate();
        registerReceiver(broadcastReceiver, intentFilter);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        unregisterReceiver(broadcastReceiver);
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    private void reactOnSms(Context context) {
        // doSomething
    }

    public void onCLick(Context context) {
        // doSomething
    }

list :

    <receiver a:name="..."...>
        <intent-filter>
            <action a:name="android.provider.Telephony.SMS_RECEIVED"/>
            <action a:name="android.MyWidget.ACTION_ON_CLICK"/>
        </intent-filter>
        <meta-data a:name="android.appwidget.provider"
                   a:resource="@xml/my_widget_provider_info"/>
    </receiver>
    <service a:name=".UpdateService"
            a:label="UpdateService">

        <intent-filter>
            <action a:name="android.provider.Telephony.SMS_RECEIVED"/>
            <action a:name="android.MyWidget.ACTION_ON_CLICK"/>
        </intent-filter>
    </service>

我试过这个 Clickable widgets in android

Answer 1

我找到了解决方案。

对于那些阅读了这个问题的人，我深表歉意。里面的代码太多了，我明白了。

问题在于 UpdateService 不是广播 Intent 的真正处理程序。 BroadcastReceiver 的匿名实现完成了所有工作。

所以问题出在这段代码中(widgetProvider):

@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
                 int[] appWidgetIds) {
    super.onUpdate(context, appWidgetManager, appWidgetIds);
    for (int i = 0; i < appWidgetIds.length; i++) {
        int appWidgetId = appWidgetIds[i];

        RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.main);
        // wrong:
        // Intent widgetClickIntent = new Intent(context, UpdateService.class);
        // widgetClickIntent.setAction(UpdateService.ACTION_ON_CLICK);
        // PendingIntent pendingIntentViewClick = PendingIntent.getService(context, 0, widgetClickIntent, 0);
        // correct:
        Intent widgetClickIntent = new Intent(UpdateService.ACTION_ON_CLICK);
        PendingIntent pendingIntentViewClick = PendingIntent.getBroadcast(context, 0, widgetClickIntent, 0);
        ///////
        remoteViews.setOnClickPendingIntent(R.id.widget_imageview, pendingIntentViewClick);
        appWidgetManager.updateAppWidget(appWidgetId, remoteViews);
    }
}