Android 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 plaincopyprint?

1. package sn.len.actres;
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.TextView;
11. public class ActivityResultDemoActivityextends Activity
12. {
13. private Button button_start_task;
14. private TextView TextView_result;
15. @Override
16. public void onCreate(Bundle savedInstanceState)
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(new button_start_task_Listener());
23. }
24. private class button_start_task_Listenerimplements OnClickListener
25. {
26. public void onClick(View v)
27. {
28. Intent intent=new Intent(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. protected void onActivityResult(int requestCode,int resultCode, Intent data)
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. String bookname=data.getExtras().getString("bookname");
44. String booksale=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. }

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);//关键点来了，使用startActivityForResult来启动startActivityForResult(intent, 100);}}/** * 复写onActivityResult，这个方法 * 是要等到SimpleTaskActivity点了提交过后才会执行的 */@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data){//可以根据多个请求代码来作相应的操作if(20==resultCode){String bookname=data.getExtras().getString("bookname");String booksale=data.getExtras().getString("booksale");TextView_result.setText("书籍名称:"+bookname+"书籍价钱"+booksale+"元");}super.onActivityResult(requestCode, resultCode, data);}}

//任务处理类

[java] view plaincopyprint?

1. package sn.len.actres;
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.EditText;
11. public class SimpleTaskActivityextends Activity
12. {
13. private EditText EditText_bookname;
14. private EditText EditText_booksale;
15. private Button Button_task_fulfill;
17. @Override
18. protected void onCreate(Bundle savedInstanceState)
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(new Button_task_fulfill_Listener());
27. }
28. private class Button_task_fulfill_Listenerimplements OnClickListener
29. {
30. public void onClick(View v)
31. {
32. String str_bookname=EditText_bookname.getText().toString();
33. String str_booksale=EditText_booksale.getText().toString();
35. //判断空，我就不判断了。。。。
36. Intent data=new Intent();
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. }

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.EditText;public class SimpleTaskActivity extends Activity{private EditText EditText_bookname;private EditText EditText_booksale;private Button Button_task_fulfill;@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.main2);EditText_bookname=(EditText) findViewById(R.id.EditText_bookname);EditText_booksale=(EditText) findViewById(R.id.EditText_booksale);Button_task_fulfill=(Button) findViewById(R.id.Button_task_fulfill);Button_task_fulfill.setOnClickListener(new Button_task_fulfill_Listener());}private class Button_task_fulfill_Listener implements OnClickListener{public void onClick(View v){String str_bookname=EditText_bookname.getText().toString();String str_booksale=EditText_booksale.getText().toString();//判断空，我就不判断了。。。。Intent data=new Intent();data.putExtra("bookname", str_bookname);data.putExtra("booksale", str_booksale);//请求代码可以自己设置，这里设置成20setResult(20, data);//关闭掉这个Activityfinish();}}}