The startActivityForResult method is used to transmit data between two activities ., Startactivityresult

The startActivityForResult method is used to transmit data between two activities ., Startactivityresult

1 package com. example. testactivityresquest; 2 3 import android. app. activity; 4 import android. content. intent; 5 import android. OS. bundle; 6 import android. view. view; 7 import android. view. view. onClickListener; 8 import android. widget. button; 9 import android. widget. toast; 10 11 public class MainActivity extends Activity {12 13 @ Override14 protected void onCreate (Bundle savedInstanceState) {15 super. OnCreate (savedInstanceState); 16 setContentView (R. layout. activity_main); 17 18 Button btn = (Button) findViewById (R. id. button1); 19 btn. setOnClickListener (new OnClickListener () {20 21 @ Override22 public void onClick (View v) {23 24 Intent intent = new Intent (MainActivity. this, Activityb. class); 25 int [] nums = {15, 15}; 26 intent. putExtra (Changliang. KEY, nums); 27 // different from startActivity.. Returns a specific KEY value. 28 startActivityForResult (intent, Changliang. requestCode); 29 30} 31}); 32} 33 // data returned by Activityb obtain 34 @ Override35 protected void onActivityResult (int requestCode, int resultCode, intent data) {36 37 int s = data. getIntExtra (Changliang. activity_ B _KEY, 1); 38 39 Toast. makeText (getApplicationContext (), "the sum obtained by passing two numbers is:" + s, 1 ). show (); 40 41} 42 43}

1 package com. example. testactivityresquest; 2 3 import android. app. activity; 4 import android. content. intent; 5 import android. OS. bundle; 6 import android. view. view; 7 import android. view. view. onClickListener; 8 import android. widget. button; 9 import android. widget. toast; 10 11 public class Activityb extends Activity {12 13 @ Override14 protected void onCreate (Bundle savedInstanceState) {15 super. onCreate (savedInstanceState); 16 setContentView (R. layout. activityb); 17 18 Intent intent = this. getIntent (); 19 int [] n = intent. getIntArrayExtra (Changliang. KEY); 20 21 final int nums = n [0] + n [1]; 22 23 Toast. makeText (this, n [0] + "" + n [1], 1 ). show (); 24 25 Button btn = (Button) findViewById (R. id. button2); 26 btn. setOnClickListener (new OnClickListener () {27 28 @ Override29 public void onClick (View v) {30 31 Intent intent1 = new Intent (Activityb. this, MainActivity. class); 32 33 intent1.putExtra (Changliang. activity_ B _KEY, nums); 34 // import data to 35 Activityb Based on the intent event of the specific key value. this. setResult (Changliang. requestCode, intent1); 36 // return the main Activity37 Activityb. this. finish (); 38 39} 40}); 41} 42 43}

package com.example.testactivityresquest;public class Changliang {    public static final String KEY="key";public static final String Activity_b_KEY="key1";public static final int requestCode=1987;}

Xml file:

1 <RelativeLayout xmlns: android = "http://schemas.android.com/apk/res/android" 2 xmlns: tools = "http://schemas.android.com/tools" 3 android: layout_width = "match_parent" 4 android: layout_height = "match_parent" 5 android: background = "# ff0000"> 6 7 <Button 8 android: id = "@ + id/button1" 9 android: layout_width = "wrap_content" 10 android: layout_height = "wrap_content" 11 android: layout_alignParentTop = "true" 12 android: layout_centerHorizontal = "true" 13 android: layout_marginTop = "88dp" 14 android: text = "Start Activityb"/> 15 16 </RelativeLayout>

1 <? Xml version = "1.0" encoding = "UTF-8"?> 2 <LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android" 3 android: layout_width = "match_parent" 4 android: layout_height = "match_parent" 5 android: background = "#00ff00" 6 android: orientation = "vertical"> 7 8 <Button 9 android: id = "@ + id/button2" 10 android: layout_width = "wrap_content" 11 android: layout_height = "wrap_content" 12 android: text = "Return Activity"/> 13 14 </LinearLayout>

Do not forget to register activityb in AndroidManifast.

Run: