android之startActivityForResult的使用

在Android中startActivityForResult主要作用就是:

A-Activity需要在B-Activtiy中执行一些数据操作，而B-Activity又要将，执行操作数据的结果返回给A-Activtiy

//看效果

//看代码

[java] view plain copy

1. packagejason.actres;
3. importandroid.app.Activity;
4. importandroid.content.Intent;
5. importandroid.os.Bundle;
6. importandroid.view.View;
7. importandroid.view.View.OnClickListener;
8. importandroid.widget.Button;
9. importandroid.widget.TextView;
11. publicclassActivityResultDemoActivityextendsActivity
12. {
13. privateButtonbutton_start_task;
14. privateTextViewTextView_result;
15. @Override
16. publicvoidonCreate(BundlesavedInstanceState)
17. {
18. super.onCreate(savedInstanceState);
19. setContentView(R.layout.main);
20. button_start_task=(Button)findViewById(R.id.button_start_task);
21. TextView_result=(TextView)findViewById(R.id.TextView_result);
22. button_start_task.setOnClickListener(newbutton_start_task_Listener());
23. }
24. privateclassbutton_start_task_ListenerimplementsOnClickListener
25. {
26. publicvoidonClick(Viewv)
27. {
28. Intentintent=newIntent(ActivityResultDemoActivity.this,SimpleTaskActivity.class);
29. //关键点来了，使用startActivityForResult来启动
30. startActivityForResult(intent,100);
31. }
32. }
33. /**
34. *复写onActivityResult，这个方法
35. *是要等到SimpleTaskActivity点了提交过后才会执行的
36. */
37. @Override
38. protectedvoidonActivityResult(intrequestCode,intresultCode,Intentdata)
39. {
40. //可以根据多个请求代码来作相应的操作
41. if(20==resultCode)
42. {
43. Stringbookname=data.getExtras().getString("bookname");
44. Stringbooksale=data.getExtras().getString("booksale");
45. TextView_result.setText("书籍名称:"+bookname+"书籍价钱"+booksale+"元");
46. }
47. super.onActivityResult(requestCode,resultCode,data);
48. }
49. }

//任务处理类

[java] view plain copy

1. packagejason.actres;
3. importandroid.app.Activity;
4. importandroid.content.Intent;
5. importandroid.os.Bundle;
6. importandroid.view.View;
7. importandroid.view.View.OnClickListener;
8. importandroid.widget.Button;
9. importandroid.widget.EditText;
11. publicclassSimpleTaskActivityextendsActivity
12. {
13. privateEditTextEditText_bookname;
14. privateEditTextEditText_booksale;
15. privateButtonButton_task_fulfill;
17. @Override
18. protectedvoidonCreate(BundlesavedInstanceState)
19. {
20. super.onCreate(savedInstanceState);
21. setContentView(R.layout.main2);
23. EditText_bookname=(EditText)findViewById(R.id.EditText_bookname);
24. EditText_booksale=(EditText)findViewById(R.id.EditText_booksale);
25. Button_task_fulfill=(Button)findViewById(R.id.Button_task_fulfill);
26. Button_task_fulfill.setOnClickListener(newButton_task_fulfill_Listener());
27. }
28. privateclassButton_task_fulfill_ListenerimplementsOnClickListener
29. {
30. publicvoidonClick(Viewv)
31. {
32. Stringstr_bookname=EditText_bookname.getText().toString();
33. Stringstr_booksale=EditText_booksale.getText().toString();
35. //判断空，我就不判断了。。。。
36. Intentdata=newIntent();
37. data.putExtra("bookname",str_bookname);
38. data.putExtra("booksale",str_booksale);
39. //请求代码可以自己设置，这里设置成20
40. setResult(20,data);
41. //关闭掉这个Activity
42. finish();
43. }
44. }
45. }