This article analyzes the life cycle of Widget in Android development. Share it for your reference, as follows:
Widget is a desktop widget in Android. When creating it, you must inherit the AppWidgetProvider. AppWidgetProvider is actually a type of Receiver inheriting the BroadcastReceiver. Widget has the following life cycle methods:
1.onEnabled method: This method is called when the Widget is created for the first time and is called only once. Initialized data and service operations are often placed in this method.
2.onReceive method: The OnReceive method of BroadcastReceiver, but the difference here is that when a widget operation is received, the OnReceive method is called first, and then the relevant operation method is related. This is also easy to understand. Widget is a small control running in a desktop application. When your application needs to call Widget, it needs to send a broadcast event to call it.
3.onUpdate: Methods called by Widget when updated at a fixed time.
4.onDeleted: Methods called when Widget is deleted.
5.onDisabled: The method used for the Widget is deleted is the called method, which is opposite to the onEnabled method.
Examples and comments:
package ;
import ;
import ;
import ;
import ;
/**
* Update the interface at a fixed time according to the configuration file
* Minimum value Half an hour 1800000 milliseconds
* onRecevie -> onUpdate
*
*
* Note that the widget component is not realistic in our application
* Apps displayed on desktop
* Different desktops The creation and destruction of corresponding callback events may not be possible
* android luncher/htc sentence/miui/360 desktop/awt/qq desktop/....
*
*
*/
public class MyWidget extends AppWidgetProvider {
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
(context, intent);
("onReceive");
}
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int[] appWidgetIds) {
("onUpdate");
(context, appWidgetManager, appWidgetIds);
}
@Override
public void onDeleted(Context context, int[] appWidgetIds) {
// TODO Auto-generated method stub
("onDeleted");
(context, appWidgetIds);
//When a widget is deleted, the ondelete method will be executed }
@Override
public void onEnabled(Context context) {
// TODO Auto-generated method stub
("onEnabled");
// The method of executing the widget when it was first created // Initialize the widget data operation and enable the backend (context);
}
@Override
public void onDisabled(Context context) {
// TODO Auto-generated method stub
(context);
("onDisabled");
// When all widgets are deleted, execute ondisable(); // Stop the service we have enabled // Delete junk files Temporary files }
}
For more information about Android related content, please check out the topic of this site:Android development introduction and advanced tutorial》、《Android communication methods summary》、《Summary of the usage of basic Android components》、《Android View View Tips Summary》、《Android layout layout tips summary"and"Android control usage summary》
I hope this article will be helpful to everyone's Android programming design.