Use of Android Startactivityforresult

use of Android startactivityforresult           Androidbuttonstringclass Tasks

The main role of Startactivityforresult in Android is:

A-activity needs to perform some data operations in B-activtiy, and B-activity will return the results of the operation data to A-activtiy

See Effect

Look at the code

[Java]View Plaincopyprint?

2. Package sn.len.actres;
6. Import android.app.Activity;
8. Import android.content.Intent;
10. Import Android.os.Bundle;
12. Import Android.view.View;
14. Import Android.view.View.OnClickListener;
16. Import Android.widget.Button;
18. Import Android.widget.TextView;
22. Public class Activityresultdemoactivity extends Activity
24. {
26. private Button Button_start_task;
28. private TextView Textview_result;
30. @Override
32. public void OnCreate (Bundle savedinstancestate)
34. {
36. super.oncreate (savedinstancestate);
38. Setcontentview (R.layout.main);
40. button_start_task= (Button) Findviewbyid (r.id.button_start_task);
42. textview_result= (TextView) Findviewbyid (R.id.textview_result);
44. Button_start_task.setonclicklistener (new Button_start_task_listener ());
46. }
48. private class Button_start_task_listener implements Onclicklistener
50. {
52. public void OnClick (View v)
54. {
56. Intent intent=New Intent (activityresultdemoactivity. This,simpletaskactivity.  class);
58. //Key points come on, use Startactivityforresult to start
60. Startactivityforresult (Intent, 100);
62. }
64. }
66. /** 
68. * Carbon Onactivityresult, this method
70. * It's not going to happen until after the simpletaskactivity.
72. */
74. @Override
76. protected void Onactivityresult (int requestcode, int resultcode, Intent data)
78. {
80. //Can be operated according to multiple request codes
82. if (20==resultcode)
84. {
86. String Bookname=data.getextras (). GetString ("BookName");
88. String Booksale=data.getextras (). GetString ("Booksale");
90. Textview_result.settext ("book Name:" +bookname+"book price" +booksale+"Yuan");
92. }
94. Super.onactivityresult (Requestcode, ResultCode, data);
96. }
98. }  

Package Sn.len.actres;import Android.app.activity;import Android.content.intent;import android.os.Bundle;import Android.view.view;import Android.view.view.onclicklistener;import Android.widget.button;import Android.widget.textview;public class Activityresultdemoactivity extends Activity{private Button button_start_task; Private TextView textview_result; @Overridepublic void OnCreate (Bundle savedinstancestate) {super.oncreate ( Savedinstancestate); Setcontentview (R.layout.main); button_start_task= (Button) Findviewbyid (R.id.button_start_ Task); textview_result= (TextView) Findviewbyid (R.id.textview_result); Button_start_task.setonclicklistener (New Button_ Start_task_listener ());} Private class Button_start_task_listener implements Onclicklistener{public void OnClick (View v) {Intent intent=new Intent (Activityresultdemoactivity.this,simpletaskactivity.class);//The key point is coming, Use Startactivityforresult to start startactivityforresult (intent, 100);}} /** * Replication Onactivityresult, this method * is to wait until the simpletaskactivity point after the submission will not be executed */@Overrideprotected void Onactivityresult (int requestcode, int resultcode, Intent data) {//can be manipulated according to multiple request codes if (20==resultcode ) {String Bookname=data.getextras (). getString ("BookName"); String Booksale=data.getextras (). getString ("Booksale"); Textview_result.settext ("Book Name:" +bookname+ "book Price" +booksale+ "Yuan");} Super.onactivityresult (Requestcode, ResultCode, data);}}

Task Processing Class

[Java]View Plaincopyprint?

2. Package sn.len.actres;
6. Import android.app.Activity;
8. Import android.content.Intent;
10. Import Android.os.Bundle;
12. Import Android.view.View;
14. Import Android.view.View.OnClickListener;
16. Import Android.widget.Button;
18. Import Android.widget.EditText;
22. Public class Simpletaskactivity extends Activity
24. {
26. private EditText Edittext_bookname;
28. private EditText Edittext_booksale;
30. private Button Button_task_fulfill;
34. @Override
36. protected void OnCreate (Bundle savedinstancestate)
38. {
40. super.oncreate (savedinstancestate);
42. Setcontentview (r.layout.main2);
46. Edittext_bookname= (EditText) Findviewbyid (r.id.edittext_bookname);
48. Edittext_booksale= (EditText) Findviewbyid (R.id.edittext_booksale);
50. Button_task_fulfill= (Button) Findviewbyid (R.id.button_task_fulfill);
52. Button_task_fulfill.setonclicklistener (new Button_task_fulfill_listener ());
54. }
56. private class Button_task_fulfill_listener implements Onclicklistener
58. {
60. public void OnClick (View v)
62. {
64. String Str_bookname=edittext_bookname.gettext (). toString ();
66. String Str_booksale=edittext_booksale.gettext (). toString ();
70. //Judge empty, I will not judge ....
72. Intent data=New Intent ();
74. Data.putextra ("BookName", str_bookname);
76. Data.putextra ("Booksale", Str_booksale);
78. //Request code can be set by itself, here
80. Setresult (data);
82. //Shut down the activity
84. Finish ();
86. }
88. }
90. }

Use of Android Startactivityforresult