Android Activity返回結果startActivityForResult函數

點擊第一個按鈕，然後再第二個頁面中輸入文字，就會在第一個的EditText中出現在第二個Activity中輸入的文字，、

代碼一看就能明白startActivityForResult函數

第一個Activity

3. import Android.app.Activity;
4. import android.content.Intent;
5. import android.os.Bundle;
6. import android.util.Log;
7. import android.view.View;
8. import android.view.View.OnClickListener;
9. import android.widget.Button;
10. import android.widget.EditText;
12. public class DataBackActivity extends Activity {
13. /** Called when the activity is first created. */
14. private static final int REQUESTCODE=1;
15. private Button button;
16. private EditText editText;
17. @Override
18. public void onCreate(Bundle savedInstanceState) {
19. super.onCreate(savedInstanceState);
20. setContentView(R.layout.main);
21. button=(Button) findViewById(R.id.button1);
22. editText=(EditText) findViewById(R.id.editText1);
23. button.setOnClickListener(new MyButtonLIstener());
24. }
25. class MyButtonLIstener implements OnClickListener{
27. @Override
28. public void onClick(View v) {
29. // TODO Auto-generated method stub
30. Intent intent=new Intent();
31. intent.setClass(DataBackActivity.this, To.class);
32. startActivityForResult(intent, REQUESTCODE);
33. }
34. }
35. /* (non-Javadoc)
36. * @see android.app.Activity#onActivityResult(int, int, android.content.Intent)
37. */
38. @Override
39. protected void onActivityResult(int requestCode, int resultCode, Intent data) {
40. // TODO Auto-generated method stub
41. if (requestCode==REQUESTCODE) {
42. switch (resultCode) {
43. case RESULT_OK:
44. String dateString=data.getExtras().getString("Da");
45. Log.i("----------->", dateString);
46. editText.setText(dateString);
47. break;
49. default:
50. break;
51. }
52. }
55. super.onActivityResult(requestCode, resultCode, data);
56. }
58. }

第二個Activity

1. package rw.data;
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 To extends Activity {
12. /** Called when the activity is first created. */
14. private Button button;
15. private EditText editText;
16. @Override
17. public void onCreate(Bundle savedInstanceState) {
18. super.onCreate(savedInstanceState);
19. setContentView(R.layout.to);
20. button=(Button) findViewById(R.id.button1);
21. editText=(EditText) findViewById(R.id.editText1);
22. button.setOnClickListener(new MyButtonLIstener());
23. }
24. class MyButtonLIstener implements OnClickListener{
26. @Override
27. public void onClick(View v) {
28. // TODO Auto-generated method stub
29. Intent intent=new Intent();
30. intent.putExtra("Da", editText.getText().toString());
31. To.this.setResult(RESULT_OK, intent);
32. To.this.finish();
33. }
34. }
35. }