Android app widget (3)

1. receive broadcasts from app Widgets

// The purpose of the file in androidmanifest. As long as there is an action that matches, the class inheriting appwidgetprovider will be called:

<Cycler Android: Name = "inherit the appwidgetprovider class">

<Intent-filter>

<Action Android: Name = "android. appwidget. Action. appwidget_updata"/>

</Intent-filter>

<Intent-filter>

<Action Android: Name = "Mars. appwidget03.update _ app_widget"/> // This is a custom action

</Intent-filter>

<Meta-data Android: Name = "android. appwidget. provider"

Android: Resource = "@ XML/example_appwidget_info"/>

</Cycler>

// The process of inheriting the appwidgetprovider class in the Code is as follows:

　　　　　A.In the update method

Intent intent = new intent ();

Intent. setaction ("Mars. appwidget03.update _ app_widget ");

Use the getbroadcast method to obtain the pendingintent object

Pendingintent = pendingintent. getbroadcast (contect, 0, intent object, 0 );

B.Then, the onreciever method receives the broadcast sent by step.

　　　　

2. Update the widget status in the app widget.

Public void onreceive (context, intent ){

String action = intent. getaction ();

If (Action = "Mars. appwidget03.update _ app_widget "){

Remoteviews = new remoteviews (context. getpackage, R. layout. example_appwidget );

// Modify the image

Remoteviews. setimageviewresource (R. Id. imageid, R. drawable. Ku );

Remoteviews. Settextviewtext (R. Id. widgettextid ,"");

// Obtain the appwidgetmanager object

Appwidgetmanager = appwidgetmanager. getinstance (context );

// Componentname refers to the entire app widget control, while remoteviews refers to the controls in the app widget.

Componentname = new componentname (context, exampleappwidgetprovider. Class );

// Update the appwidget

Appwidgetmanager. updateappwidget (componentname, remoteviews );

}

// Else statement is required. Otherwise, other functions such as onupdate and onenable will not be called.

Else {

Super onreceive (context, intent );

}

}