Redirect Intent Bundle for Android screens

The screen is implemented by an activity. The screen is independent of each other, and the jump relationship between the screens is implemented by Intent.

Inter-screen jump is divided into the following categories:

1. Screen 1 Jump directly to screen 2

Intent intent = new Intent ();

Intent. setClass (screen 1 activity name. this, screen 2 activity name. class );

StartActivity (intent );

Finish (); // ends the current activity

2. Screen 1 jump to screen 2 with Parameters

Use Bundle to pass parameters.

Example: guessing games

Interface:

Important code:

The computer selection is random. The basic idea of this contact is that the three options are replaced by three numbers, so that the computer can generate a random number, different results are generated based on different numbers.

Public void onClick (View v ){

Switch (radioGroup. getCheckedRadioButtonId ()){

Case R. id. stone:

Player = 0;

Break;

Case R. id. scissors:

Player = 1;

Break;

Case R. id. textile:

Player = 2;

Break;

Default:

Toast. makeText (MainActivity. this, "select", Toast. LENGTH_LONG). show ();

Break;

}

Skip ();

}

// Page Jump

Private void skip (){

Intent intent = new Intent ();

Intent. setClass (MainActivity. this, ResultMainActivity. class );

Bundle bundle = new Bundle ();

Bundle. putInt ("player", player );

Bundle. putInt ("computer", new Random (). nextInt (3 ));

Intent. putExtra ("result", bundle );

StartActivity (intent );

}

After the jump, you must accept the parameters:

Bundle bundle = this. getIntent (). getBundleExtra ("result ");

Int playerInt = bundle. getInt ("player ");

Int computerInt = bundle. getInt ("computer ");

Complete guessing game code:

Activity_first.xml code

     
          
          
           
           
       
      
  
 Activity_second.xml code

     
  
 FirstActivity. java code package com. example. caiquangame; import java. util. random; import android. OS. bundle; import android. app. activity; import android. content. intent; import android. view. view; import android. view. view. onClickListener; import android. widget. button; import android. widget. radioGroup; import android. widget. toast; import android. support. v4.app. navUtils; public class firstActivity extends Activity {private Button chuquan; private RadioGroup quans; private int player; @ Override public void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_first); setTitle ("guessing game"); chuquan = (Button) findViewById (R. id. chuquan); chuquan. setOnClickListener (mChuQuanListener); quans = (RadioGroup) findViewById (R. id. quans);} private OnClickListener mChuQuanListener = new OnClickListener () {@ Overridepublic void onClick (View arg0) {// TODO Auto-generated method stubswitch (quans. getCheckedRadioButtonId () {case R. id. shitou: player = 0; break; case R. id. jiandao: player = 1; break; case R. id. bu: player = 2; break; default: Toast. makeText (firstActivity. this, "select", Toast. LENGTH_LONG ). show (); break;} // pass the value to secondActivityskip () ;}}; private void skip () {Intent intent = new Intent (); intent. setClass (firstActivity. this, secondActivity. class); Bundle bundle = new Bundle (); bundle. putInt ("player", player); bundle. putInt ("computer", new Random (). nextInt (3); intent. putExtra ("result", bundle); startActivity (intent );}}

SecondActivity. java code

Package com. example. caiquangame; import android. OS. bundle; import android. app. activity; import android. view. menu; import android. view. menuItem; import android. widget. textView; import android. widget. toast; import android. support. v4.app. navUtils; public class secondActivity extends Activity {private TextView TV; @ Override public void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_second); setTitle ("result"); TV = (TextView) findViewById (R. id. show); Bundle bundle = this. getIntent (). getBundleExtra ("result"); int playerInt = bundle. getInt ("player"); int computerInt = bundle. getInt ("computer"); TV. setText ("guessing Result \ n"); TV. append ("your choice:"); intChangeString (playerInt); TV. append ("Computer Selection:"); intChangeString (computerInt); TV. append ("Result:"); if (playerInt = 0) {if (computerInt = 0) {TV. append ("Draw");} else if (computerInt = 1) {TV. append ("you are the winner");} else {TV. append ("computer is the winner") ;}} else if (playerInt = 1) {if (computerInt = 0) {TV. append ("computer is the winner");} else if (computerInt = 1) {TV. append ("Draw");} else {TV. append ("you are the winner") ;}} else {if (computerInt = 0) {TV. append ("you are the winner");} else if (computerInt = 1) {TV. append ("computer is the winner");} else {TV. append ("Draw") ;}} private void intChangeString (int n) {switch (n) {case 0: TV. append ("Stone \ n"); break; case 1: TV. append ("Scissors \ n"); break; case 2: TV. append ("cloth \ n"); break; default: Toast. makeText (secondActivity. this, "error", Toast. LENGTH_LONG ). show (); break ;}}}

3. Jump to screen 2 from Screen 1, return value to screen 1 after execution of screen 2 (with return value jump)

Reference sample program: ReceiveResult (ApiDemo => App => Activity => ReceiveResult)

Important code:

// Adjust Screen 1 to screen 2

Intent intent = new Intent (Forward. this, ForwardTargetActivity. class );

StartActivityForResult (intent, GET_CODE );

// Set the return value on screen 2

SetResult (RESULT_ OK, (new Intent (). setAction ("Violet! "));

Finish ();

// Get the content returned from screen 2 on screen 1

@ Override

Protected void onActivityResult (int RequestCode, int ResultCode, Intent data)

{

If (RequestCode = GET_CODE)

{

If (ResultCode = RESULT_CANCELED)

{

Edit. append ("canceled! ");

}

Else

{

Edit. append ("(okay ");

Edit. append (Integer. toString (ResultCode ));

Edit. append (")");

}

If (data! = Null)

{

Edit. append (data. getAction ());

}

}

Edit. append ("\ n ");

}