Android Intent (initially enters intent)

In a project, it is composed of multiple Activity programs. At this time, communication between these Activity programs is required, and communication between these activities is completed by Intent. Intent operation method supported by the Activity program

No.	Method	Type	Description
1	Public void startActivity (Intent intent)	Normal	Start an Activity and transmit data through Intent
2	Public void startActivityForResult (Intent intent, int requestCode)	Normal	Start and receive data from another Activity program. onActivityResult () can be triggered only when requestCode is greater than 0 ()
3	Public Intent getIntent ()	Normal	Returns the Intent of the current Activity.
4	Protected void onActivityResult (int requestCode, int resultCode, Intent data)	Normal	This method is used to process the return operation when Intent data is returned.
5	Public void finish ()	Normal	When this method is called, the previous Activity program is returned and the onActivityResult () method is automatically called.
6	Public final Cursor managedQuery (Uri uri, String [] projection, String selection, String [] selectionArgs, String sortOrder)	Normal	Processing the returned Cursor result set

The XML configuration file box JAVA file is as follows:

 
 
  
? The layout manager height is the screen height.
  ? Display text by default
  ? The component height is the text height.
 

Public class Send extends Activity {private Button mybut = null; // Button component private TextView msg = null; // Text Component @ Overridepublic void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); super. setContentView (R. layout. send_main); // default layout manager this. mybut = (Button) super. findViewById (R. id. mybut); // get the component this. msg = (TextView) super. findViewById (R. id. msg); // obtain the component this. mybut. setOnClickListener (New OnClickListenerImpl (); // defines the Click Event} private class OnClickListenerImpl implements OnClickListener {@ Overridepublic void onClick (View view) {Intent it = new Intent (Send. this, Receive. class); // instantiate Intentit. putExtra ("myinfo", "I plan to plan the utilities"); // Send additional information. this. startActivityForResult (it, 1); // start Activity }}@ Overrideprotected void onActivityResult (int requestCode, int resultCode, Intent data) {switch ( ResultCode) {// determine the operation type case RESULT_ OK: // The msg operation is successful. setText ("Returned content:" + data. getStringExtra ("retmsg"); break; case RESULT_CANCELED: // cancel the msg operation. setText ("Operation canceled. "); Break; default: break ;}}}

 
 
  
? The layout manager height is the screen height.
  ? The component height is the text height.
  ? Display text by default
 

Public class Receive extends Activity {private TextView show = null; // private Button retbut = null for the text display component; // Button component @ Overridepublic void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); super. setContentView (R. layout. receive_main); // call the default layout manager this. show = (TextView) super. findViewById (R. id. show); // obtain the component this. retbut = (Button) super. findViewById (R. id. retbut); // get the component Intent it = super. getIntent (); // get the IntentString info = it. getStringExtra ("myinfo"); // get the additional information for this setting. show. setText (info); // sets the text display information this. retbut. setOnClickListener (new OnClickListenerImpl (); // set listener} private class OnClickListenerImpl implements OnClickListener {@ Overridepublic void onClick (View view View) {Receive. this. getIntent (). putExtra ("retmsg", "HAHAHA"); // return information // set the status of the returned data, RESULT_ OK and Send. receive. this. setResult (RESULT_ OK, Receive. this. getIntent (); Receive. this. finish (); // end Intent }}}