Question

For me I have a button widget with a button that is just suppose to launch a helloworld activity when I click it. I’ve tried following many posts online including this one, and yet the problem still there. I press the button, nothing happens. I am working on version 2.3 of android. Can someone point out what I am doing wrong?

My widget:

public class IconWidgetProvider extends AppWidgetProvider {

    @Override
    public void onUpdate(final Context context, final AppWidgetManager appWidgetManager, final int[] appWidgetIds) {
        final int N = appWidgetIds.length;

        for (int i=0; i<N; i++) {
            final Intent intent = new Intent(Intent.ACTION_MAIN, null);
            intent.addCategory(Intent.CATEGORY_LAUNCHER);
            // first param is app package name, second is package.class of the main activity
            final ComponentName cn = new ComponentName("com.followup","com.followup.FollowUpActivity");
            intent.setComponent(cn);
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            final PendingIntent myPI = PendingIntent.getActivity(context, 0, intent, 0);

            final RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.icon_widget_layout);


            views.setOnClickPendingIntent(R.id.image_in_widget, myPI);

            final AppWidgetManager mgr = AppWidgetManager.getInstance(context);             mgr.updateAppWidget(cn, views);
        }
    }

}

homescreeniconinfo.xml

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:minWidth="146dip"
    android:minHeight="72dip"
    android:updatePeriodMillis="0"
    android:initialLayout="@layout/icon_widget_layout"  >
</appwidget-provider>

icon_widget_layout.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal">


    <Button android:name="@+id/image_in_widget"
        android:contentDescription="@string/iconDescription"
        android:layout_width="0dp"
        android:layout_height="fill_parent"
        android:layout_weight=".50"
        android:clickable="true"
        />

</LinearLayout>

mainifest:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.followup"
    android:versionCode="1"
    android:versionName="1.0" >
.
.
.
<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" >
    .
            .
            .
    <!-- Home icon widget -->
    <receiver android:name="IconWidgetProvider" 
              android:label="@string/app_name"
              android:icon="@drawable/ic_launcher">
        <intent-filter>
            <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
        </intent-filter>
        <meta-data 
            android:name="android.appwidget.provider"
            android:resource="@xml/homescreeniconinfo" />
    </receiver>

        <activity
            android:name=".FollowUpActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>

</manifest>

Answer 1

Have you tried adding the event handler to your button?
Perhaps I’m confused here as it’s been a while since I actually did some intense android programming, but from what I understand, this is what I’ve done to call an intent from another one in the past…

<Button android:name="@+id/image_in_widget"
        android:contentDescription="@string/iconDescription"
        android:layout_width="0dp"
        android:layout_height="fill_parent"
        android:layout_weight=".50"
        android:clickable="true"
        android:onClick="onClickFunction"
        />

Paying extra attention to

android:onClick="onClickFunction"

Where “onClickFunction” would be a written method somewhere in your code that gets called when the button is clicked

public void onClickFunction(View view){ 
    //stuff to do on click
}

EDIT
This is ripped straight from the HelloWorld android tutorial which I have compiled and successfully run on my 2.3 Android Phone in the past
this is the xml

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/button_send"
    android:onClick="sendMessage" />

this is in the main .java file

/* called when the user clicks a button */
public void sendMessage(View view)
{
    Intent intent = new Intent(this, DisplayMessageActivity.class);
    EditText editText = (EditText)findViewById(R.id.edit_message);
    String message = editText.getText().toString();
    intent.putExtra(EXTRA_MESSAGE, message);
    startActivity(intent);
}

DisplayMessageActivity.class is the class that is essentially a new application (from your case I believe you want it to be a Hello World app)

so you would make an XML for that called application and change/rewrite the DisplayMessageActivity class to do whatever “HelloWorld”-ey stuff you want…