RemoteViews<\/code><\/a> to display their user interface. RemoteViews<\/code><\/a> can be executed by another process with the same permissions as the original application. This way the Widget runs with the permissions of its defining application. This is form the official Android Documentation : ” RemoteView<\/code> is a\u00a0class that describes a view hierarchy that can be displayed in another process. The hierarchy is inflated from a layout resource file, and this class provides some basic operations for modifying the content of the inflated hierarchy.”<\/p>\nThe user interface of a \u00a0Widget is defined by an BroadcastReceiver<\/code><\/a>. This BroadcastReceiver<\/code> inflates the layout into the\u00a0RemoteViews<\/code> of the Widget. \u00a0Then\u00a0RemoteViews<\/code>\u00a0is delivered to Android, which updates the user interface at the home screen application.<\/p>\nWidgets have limited functionality and styles compared to Activities<\/a><\/code>. So you may need to thing some workarounds to do more complex stuff, like we want to do. And so to launch a pop up dialogue from our widget here’s what we do: When the widget is clicked we simply launch a new Activity<\/code> with android:theme=\"@android:style\/Theme.Dialog\"<\/code> property set in the configuration of the Activity<\/code> in AndroidManifest.xml<\/code>.<\/p>\nTo sum up the basic steps, we are going to:<\/p>\n
\n- Create an Android Widget.<\/li>\n
- Create an
Intent<\/a><\/code> that when sent to the BroadcastReceiver<\/code> it marks the launching of the new Activity.<\/li>\n- Register a
ClickListener<\/code> to the widget. Thus when the widget is pressed the above Intent<\/code> will be sent to the BroadcastReceiver<\/code>.<\/li>\n- When this
Intent<\/code> is received, a new Activity<\/code> that will look like a pop up dialog box, will be lauched.<\/li>\n<\/ul>\nLet’s see how it’s done.<\/p>\n
2. Create a new Android Widget<\/h1>\n
For this tutorial, we will use the following tools in a Windows 64-bit platform:<\/p>\n
\n- JDK 1.7<\/li>\n
- Eclipse 4.3 Kepler<\/li>\n
- Android SKD 4.3<\/li>\n<\/ol>\n
2.1 Create a new Android Project<\/h3>\n
Open Eclipse IDE and go to File -> New -> Project -> Android -> Android Application Project.<\/p>\n
![\"new-android-project\"](\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2013\/10\/new-android-project1.jpg\")
<\/a><\/p>\nYou have to specify the Application Name, the Project Name and the Package name in the appropriate text fields and then click Next.<\/p>\n
![\"new-android-appl\"](\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/new-android-appl.jpg\")
<\/a><\/p>\nIn the next window un check \u201cCreate activity\u201d option as we will create the PopUpActivity<\/code> later.<\/p>\n![\"configure-project-no-activity\"](\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/configure-project-no-activity.jpg\")
<\/a><\/p>\nClick “Finish”.<\/p>\n
2.2 Define a custom background shape for the widget<\/h3>\n
Go to the package explorer and open a \/res\/drawable-*<\/code> folders.<\/p>\n![\"drawable-folders\"](\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/drawable-folders.jpg\")
<\/a><\/p>\nRight Click on one of the folders (I’ve picked \/res\/drawble-hdpi<\/code>) -> New -> Other -> Android -> Android XML File<\/p>\n![\"new-xml-file\"](\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/new-xml-file.jpg\")
<\/a><\/p>\nFrom the “Root Element” list select shape and the give the file the name\u00a0custom_shape.xml:<\/code><\/p>\n![\"custom-xml-shape\"](\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/custom-xml-shape.jpg\")
<\/a><\/p>\nNow, open that file and paste the following code , describing the layout of a simple shape.<\/p>\n
custom_shape.xml:<\/span><\/em><\/p>\n<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n<shape xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"\r\n android:shape=\"rectangle\" >\r\n\r\n <gradient\r\n android:angle=\"90\"\r\n android:endColor=\"#333\"\r\n android:startColor=\"#333\" \/>\r\n\r\n <corners\r\n android:bottomLeftRadius=\"2dp\"\r\n android:bottomRightRadius=\"2dp\"\r\n android:topLeftRadius=\"2dp\"\r\n android:topRightRadius=\"2dp\" \/>\r\n\r\n <stroke\r\n android:width=\"2dp\"\r\n android:color=\"#333\" \/>\r\n\r\n<\/shape><\/pre>\n2.3 Define a simple layout for the widget<\/h3>\n
Navigate to res\/layout<\/code> folder on the Package Explorer. Right Click on the folder -> New -> Other -> Android -> Android XML Layout File. Create the file \u00a0with name widget_layout<\/code>.<\/p>\n![\"widget-layout\"](\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/widget-layout.jpg\")
<\/a> <\/div> <\/div><\/p>\nAnd paste the following code:<\/p>\n
widget_layout.xml<\/code>:<\/span><\/em><\/p>\n<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n<LinearLayout xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"\r\n android:id=\"@+id\/linearLayout\"\r\n android:layout_width=\"match_parent\"\r\n android:layout_height=\"match_parent\"\r\n android:layout_margin=\"8dip\"\r\n android:background=\"@drawable\/custom_shape\" >\r\n\r\n <TextView\r\n android:id=\"@+id\/myText\"\r\n style=\"@android:style\/TextAppearance.Medium\"\r\n android:layout_width=\"match_parent\"\r\n android:layout_height=\"match_parent\"\r\n android:layout_gravity=\"center\"\r\n android:layout_margin=\"4dip\"\r\n android:gravity=\"center_horizontal|center_vertical\"\r\n android:text=\"Press Me\"\r\n android:textColor=\"#FFF\" >\r\n\r\n <\/TextView>\r\n\r\n<\/LinearLayout><\/pre>\n2.4 Create the AppWidgetProvider<\/code> XML description file.<\/h3>\nGo to File -> New -> Other -> Android -> Android XML File. From the “Resource Type” list select “AppWidget Provider” and name the file widget_provider.xml.<\/code><\/p>\n![\"new-widget-provider\"](\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/new-widget-provider.jpg\")
<\/a><\/p>\nYou will find the file under the newly created \/res\/xml<\/code> folder:<\/p>\n![\"new-folder\"](\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/new-folder.jpg\")
<\/a><\/p>\nOpen the file and paste the following code, which is basically meta data for the AppWidgetProvider.<\/code><\/p>\nwidget_provider.xml:<\/span><\/em><\/p>\n<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n<appwidget-provider xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"\r\n android:initialLayout=\"@layout\/widget_layout\"\r\n android:minHeight=\"50dp\"\r\n android:minWidth=\"120dp\" >\r\n\r\n<\/appwidget-provider><\/pre>\n2.5 Create the AppWidgetProvider<\/code> class<\/h3>\nNow create a new class that extends AppWidgetProvider<\/code>, under com.javacodegeeks.android.androidwidgetdialog<\/code> package. This will be the BroadcastReceiver<\/code> of the widget.<\/p>\nAndroidWidget.java:<\/span><\/em><\/p>\npackage com.javacodegeeks.android.androidwidgetdialog;\r\n\r\nimport android.app.PendingIntent;\r\nimport android.appwidget.AppWidgetManager;\r\nimport android.appwidget.AppWidgetProvider;\r\nimport android.content.ComponentName;\r\nimport android.content.Context;\r\nimport android.content.Intent;\r\nimport android.widget.RemoteViews;\r\n\r\npublic class AndroidWidget extends AppWidgetProvider {\r\n\r\n\tprivate static final String SHOW_POPUP_DIALOG_ACTION = \"com.javacodegeeks.android.showpopupdialog\";\r\n\r\n\t@Override\r\n\tpublic void onUpdate(Context context, AppWidgetManager appWidgetManager,\r\n\t\t\tint[] appWidgetIds) {\t\r\n\r\n\t\tComponentName thisWidget = new ComponentName(context,\r\n\t\t\t\tAndroidWidget.class);\r\n\r\n\t\t\/\/ Obtain all instances of our widget\r\n\t\t\/\/ Remember that you can have as many instances of the same widget as you want on the home screen \r\n\r\n\t\tint[] allWidgetInstancesIds = appWidgetManager.getAppWidgetIds(thisWidget);\r\n\t\tfor (int widgetId : allWidgetInstancesIds) {\r\n\r\n\t\t\tRemoteViews remoteViews = new RemoteViews(context.getPackageName(),\r\n\t\t\t\t\tR.layout.widget_layout);\r\n\r\n\t\t\t\/\/ Create an intent that when received will launch the PopUpActivity\r\n\t\t\tIntent intent = new Intent(context, AndroidWidget.class);\r\n\t\t\tintent.setAction(SHOW_POPUP_DIALOG_ACTION);\r\n\r\n\t\t\tPendingIntent pendingIntent = PendingIntent.getBroadcast(context,\r\n\t\t\t\t\t0, intent, PendingIntent.FLAG_UPDATE_CURRENT);\r\n\r\n\t\t\t\/\/ Set up the onClickListener of the widget\r\n\t\t\t\/\/ Now, when the widget is pressed the pendingIntent will be sent\r\n\r\n\t\t\tremoteViews.setOnClickPendingIntent(R.id.myText, pendingIntent);\r\n\r\n\t\t\tappWidgetManager.updateAppWidget(widgetId, remoteViews);\r\n\r\n\t\t}\r\n\r\n\t\tsuper.onUpdate(context, appWidgetManager, appWidgetIds);\r\n\r\n\t}\r\n\r\n\t@Override\r\n\tpublic void onReceive(final Context context, Intent intent) {\r\n\r\n\t\t\/\/ If the intent is the one that we've defined to launch the pop up dialog\r\n\t\t\/\/ then create and launch the PopUpActivity\r\n\t\tif (intent.getAction().equals(SHOW_POPUP_DIALOG_ACTION)) {\r\n\r\n\t\t\tIntent popUpIntent = new Intent(context, PopUpActivity.class);\r\n\t\t\tpopUpIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);\r\n\t\t\tcontext.startActivity(popUpIntent);\r\n\r\n\t\t}\r\n\r\n\t\tsuper.onReceive(context, intent);\r\n\r\n\t}\r\n\r\n}<\/pre>\nAs you can see we use a PendingIntent<\/a><\/code> instance. A PendingIntent<\/code> is a description of an Intent and target action to perform with it. When you give a PendingIntent<\/code> to another application, you are granting it the right to perform the operation you have specified with the same permissions and identity. And thus, you should be careful about how you use the PendingIntent<\/code>. In this example we’ve obtained the PendingIntent<\/code> instance calling getBroadcast<\/code> method. This method will retrieve a PendingIntent<\/code> that will perform a broadcast, like calling Context.sendBroadcast()<\/code>.<\/p>\nNow the flow of the execution goes like this:<\/p>\n
\n- As defined, the
onUpdate<\/code> method is executed only once, when the widget is installed on the home screen. You can set up a time interval to execute the onUpdate<\/code> method by defining the android:updatePeriodMillis<\/code> property on the widget_provider.xml<\/code> file. So when, onUpdate<\/code> method is executed, first we retrieve all the instance ids of the widget that the user has installed on the home screen.<\/li>\n- Then we create a new
Intent<\/code> with action com.javacodegeeks.android.showpopupdialog<\/code>. Retrieve a new broadcasting PendingIntent<\/code><\/li>\n- Register an
OnClickPendingIntent<\/code> listener to the RemoteView<\/code> of each widget.<\/li>\n- Now when the user clicks on the Widget, the
Intent<\/code> with action com.javacodegeeks.android.showpopupdialog<\/code> will be broadcast. This is the Intent created in line 32 of the above code (used also to create the PendingIntent<\/code> instance).<\/li>\n- The Intent will be received and the
onReceive<\/code> will be executed. If the Intent<\/code> received has com.javacodegeeks.android.showpopupdialog<\/code> action the PopUpActivity<\/code> class will be launched.<\/li>\n<\/ol>\nNow let’s see the code of the\u00a0PopUpActivity.<\/code><\/p>\n3. Create the\u00a0PopUpActivity<\/code><\/h1>\nPopUpActivity<\/code> is a simple Activity<\/code> class that will be launched as a Dialogue box.<\/p>\nGo to the Package Explorer and Right click on the com.javacodegeeks.android.androidwidgetdialog<\/code> package -> New -> Other -> Android -> Android Activity.<\/p>\n![\"new-activity\"](\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/new-activity.jpg\")
<\/a><\/p>\nSet the name to “PopUpActivity”. As you can see the layout file of this activity will be automatically created with name “activity_pop_up.xml”.<\/p>\n
![\"new-pop-up-activity\"](\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/new-pop-up-activity.jpg\")
<\/a><\/p>\nTo set the layout of the activity open \/res\/layout\/activity_pop_up.xml<\/code> file and paste the following code.<\/p>\nactivity_pop_up.xml:<\/span><\/em><\/p>\n<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n<LinearLayout xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"\r\n xmlns:tools=\"http:\/\/schemas.android.com\/tools\"\r\n android:layout_width=\"220dp\"\r\n android:layout_height=\"wrap_content\" \r\n android:gravity=\"center_horizontal\"\r\n android:orientation=\"vertical\" >\r\n\r\n <TextView\r\n android:id=\"@+id\/mytxt\"\r\n android:layout_width=\"fill_parent\"\r\n android:layout_height=\"wrap_content\"\r\n android:layout_marginBottom=\"10dp\"\r\n android:layout_marginLeft=\"0dp\"\r\n android:layout_marginRight=\"0dp\"\r\n android:layout_marginTop=\"5dp\"\r\n android:gravity=\"center_horizontal\"\r\n android:textColor=\"#FFF\"\r\n android:textSize=\"13sp\" \/>\r\n\r\n <Button\r\n android:id=\"@+id\/closBtn\"\r\n android:layout_width=\"wrap_content\"\r\n android:layout_height=\"wrap_content\"\r\n android:text=\"Close\" \/>\r\n\r\n<\/LinearLayout><\/pre>\nThis is the code of the PopUpActivity<\/code> class.<\/p>\nPopUpActivity.java:<\/span><\/em><\/p>\npackage com.javacodegeeks.android.androidwidgetdialog;\r\n\r\nimport java.util.Random;\r\n\r\nimport android.app.Activity;\r\nimport android.os.Bundle;\r\nimport android.view.Menu;\r\nimport android.view.View;\r\nimport android.view.View.OnClickListener;\r\nimport android.view.Window;\r\nimport android.widget.Button;\r\nimport android.widget.TextView;\r\n\r\npublic class PopUpActivity extends Activity {\r\n\r\n\t@Override\r\n\tprotected void onCreate(Bundle savedInstanceState) {\r\n\t\tsuper.onCreate(savedInstanceState);\r\n\t\trequestWindowFeature(Window.FEATURE_NO_TITLE);\r\n\t\tsetContentView(R.layout.activity_pop_up);\r\n\r\n\t\tString dialogText = \"Dialog Box : \" + (new Random().nextInt(100));\r\n\t\tTextView txt = (TextView) findViewById(R.id.mytxt);\r\n\t\ttxt.setText(dialogText);\r\n\r\n\t\tButton dismissbutton = (Button) findViewById(R.id.closBtn);\r\n\t\tdismissbutton.setOnClickListener(new OnClickListener() {\r\n\t\t\t@Override\r\n\t\t\tpublic void onClick(View v) {\r\n\t\t\t\tPopUpActivity.this.finish();\r\n\t\t\t}\r\n\t\t});\r\n\t}\r\n\r\n}<\/pre>\nNothing spacial in the above code. We simple set the value of the mytxt<\/code> TextView<\/code>. And we register a ClickListener<\/code> for the dismiss button. When the button is pressed the PopUpActivity<\/code> will be terminated.<\/p>\n4. AndroidManifest.xml<\/code> Configuration<\/h1>\nThis is a very important step of the tutorial. Open AndroidManifest.xml<\/code> file and paste the following code:<\/p>\nAndroidManifest.xml:<\/span><\/em><\/p>\n<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n<manifest xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"\r\n package=\"com.javacodegeeks.android.androidwidgetdialog\"\r\n android:versionCode=\"1\"\r\n android:versionName=\"1.0\" >\r\n\r\n <uses-sdk\r\n android:minSdkVersion=\"8\"\r\n android:targetSdkVersion=\"18\" \/>\r\n\r\n <application\r\n android:allowBackup=\"true\"\r\n android:icon=\"@drawable\/ic_launcher\"\r\n android:label=\"@string\/app_name\"\r\n android:theme=\"@style\/AppTheme\" >\r\n\r\n <receiver\r\n android:name=\".AndroidWidget\"\r\n android:icon=\"@drawable\/ic_launcher\"\r\n android:label=\"Android Custom Widget\" >\r\n <intent-filter>\r\n <action android:name=\"com.javacodegeeks.android.showpopupdialog\" \/>\r\n <action android:name=\"android.appwidget.action.APPWIDGET_UPDATE\" \/>\r\n <\/intent-filter>\r\n\r\n <meta-data\r\n android:name=\"android.appwidget.provider\"\r\n android:resource=\"@xml\/widget_provider\" \/>\r\n <\/receiver>\r\n\r\n <activity\r\n android:name=\"com.javacodegeeks.android.androidwidgetdialog.PopUpActivity\"\r\n android:label=\"@string\/title_activity_pop_up\"\r\n android:theme=\"@android:style\/Theme.Dialog\" >\r\n <\/activity>\r\n <\/application>\r\n\r\n<\/manifest><\/pre>\nAs you can see we’ve set up a receiver, that registers our code>AppWidgetProvider for our application, that can receive broadcasts<\/p>\n
\n- <action android:name=”com.javacodegeeks.android.showpopupdialog” \/><\/li>\n
- <action android:name=”android.appwidget.action.APPWIDGET_UPDATE” \/><\/li>\n<\/ol>\n
The first one is the Intent that we’ve registered ourselves. The second one is an Intent send by Android. We also provide the meta data to the the AppWidgetProvider<\/code>, pointing to the widget_provider.xml<\/code> resource file we’ve created earlier.<\/p>\nThe important bit is in line 34, where we define the theme of the application as android:theme=\"@android:style\/Theme.Dialog\"<\/code>. This will create an activity with a pop up dialogue theme<\/p>\nLet’s see how it looks like on the emulator.<\/p>\n
5. Run the Apllication<\/h1>\n
When your run the application and the emulator launches go to the Apps button on the home screen :<\/p>\n
![\"main-screen\"](\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/main-screen.jpg\")
<\/a><\/p>\nThe tap on “Widgets”. Drag and drop your Widget to the home screen<\/p>\n
![\"widgets\"](\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/widgets.jpg\")
<\/a><\/p>\nHere it is:<\/p>\n
![\"widget-onscreen\"](\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/widget-onscreen.jpg\")
<\/a><\/p>\nNow when you click on the Widget:<\/p>\n
![\"dialog\"](\"http:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/dialog.jpg\")
<\/a><\/p>\nThat’s it.<\/p>\n
Download the Eclipse Project<\/h3>\n
This was an Android example on how to create\u00a0Modal dialog (popup) from Android widget. Download the Eclipse Project of this tutorial:\u00a0AndroidWidgetDialog.zip<\/a>
\n<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"In this example we are going to see \u00a0how you can create an Android widget in the home screen that can open a pop up dialogue box. As you know, Android Widgets are small applications that can basically do two things. Launch a new Activity when pressed, or display information that get updated at a …<\/p>\n","protected":false},"author":7,"featured_media":46,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-12800","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-android-core"],"yoast_head":"\n
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