Intent object, intent

Intent object, intent

The Intent object represents an Intent in the Android system. The most important content is action and data. Data can be transmitted between activities through Intent objects: Intent objects are generated in A, data is stored in Intent objects using putExtra () methods, and Activity is started. getIntent () get the Intent object and use the getXXXExtra () series method to retrieve data from the Intent object

The putExtra () method has two parameters. The first parameter is the key (including the package name), and the second parameter is the value.

 

The returned value of getIntent () is the Intent object that started the Activity.

 

The getIntExtra () method also has two parameters. The first parameter is the key (including the package name), the second parameter is the default value, and the return result is the default value when the key does not exist. Other getXXXExtra () methods do not necessarily have default values.