首先看结构 这个结构由三部分组成：

startActivityForResult

onActivityResult()

setResult()

这个三个函数构成

具体的参数就不写了 应该能知道。

注意的是调用setResult之后必须调用finish()不然的话 是不会跳转的

调用setResult的时候直接调用即将回跳的函数的

onActivityResult() 然后在调用该函数的onrestart onstart onresume  如果你在每个setResult后下finish方法 那么该activity直接调用destory方法。

第一个activity

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Log.v("startforrequest", "onCreate:"+this.getLocalClassName());
        Button bt=(Button)findViewById(R.id.bt);
        bt.setOnClickListener(new OnClickListener(){

@Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    Intent intent=new Intent(StartForResultTest.this,StartForResultTest1.class);
    startActivityForResult(intent, 0);
   }});
    }

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
     // TODO Auto-generated method stub
     super.onActivityResult(requestCode, resultCode, data);
     Log.v("startforrequest", "onActivityResult: "+requestCode+" : "+resultCode);
    }

第二个activity

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main1);
        Log.v("startforrequest", "onCreate:"+this.getLocalClassName());
        Button bt=(Button)findViewById(R.id.bt);
        bt.setOnClickListener(new OnClickListener(){

@Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    Intent intent=new Intent(StartForResultTest1.this,StartForResultTest2.class);
    startActivityForResult(intent, 1);
   }});
    }

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
     // TODO Auto-generated method stub
     super.onActivityResult(requestCode, resultCode, data);
     Intent intent=new Intent(this,StartForResultTest.class);
     setResult(1, intent);
     finish();
     Log.v("startforrequest", "onActivityResult: "+requestCode+" : "+resultCode);
    }

第三个也就是最后一个activity

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main2);
        Log.v("startforrequest", "onCreate:"+this.getLocalClassName());
        Button bt=(Button)findViewById(R.id.bt);
        bt.setOnClickListener(new OnClickListener(){

@Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    Intent intent=new Intent(StartForResultTest2.this,StartForResultTest1.class);
       setResult(2, intent);
       finish();
   }});
    }

那么当跳转到最后一个的时候 回直接调回第一个activity 调用restart start resume方法之后

再destory 最后一个 倒数第二个..

/

startActivityForResult Demo

startActivityForResult(Itent intent, int requestCode)用来唤起一个Activity。利用这个方法，前一个Activity1便会有一个等待次Activity2的返回，返回时响应onActivityResult(int requestCode, int resultCode, Intent data)方法。
  Demo如下：
  第一个activity

Java代码  

1. package com.kevin.intent;
2. import android.app.Activity;
3. import android.content.Intent;
4. import android.os.Bundle;
5. import android.view.View;
6. import android.view.View.OnClickListener;
7. import android.widget.Button;
8. import android.widget.EditText;
9. public class Main extends Activity implements OnClickListener{
10. private Button btn_transfer;
11. private EditText et_name;
12. private int requestCode = 1;
13. /** Called when the activity is first created. */
14. @Override
15. public void onCreate(Bundle savedInstanceState) {
16. super.onCreate(savedInstanceState);
17. setContentView(R.layout.main);
18. btn_transfer = (Button) findViewById(R.id.button1);
19. et_name = (EditText) findViewById(R.id.editText1);
20. btn_transfer.setOnClickListener(this);
21. }
22. @Override
23. protected void onActivityResult(int requestCode, int resultCode, Intent data) {
24. System.out.println("requestCode--->" + requestCode);
25. // resultCode是第二个Activity返回过来的值
26. switch (resultCode) {
27. case RESULT_OK:
28. // 获取Bundle对象
29. Bundle returnedBundle = data.getExtras();
30. String returnedName = returnedBundle.getString("name");
31. et_name.setText(returnedName);
32. break;
33. default:
34. break;
35. }
36. }
37. @Override
38. public void onClick(View v) {
39. // 取得et_name的值
40. String name = et_name.getText().toString();
41. Bundle bundle = new Bundle();
42. bundle.putString("name", name);
43. Intent intent = new Intent();
44. intent.setClass(this, Activity_1.class);
45. intent.putExtras(bundle);
46. // 启动Activity_1
47. startActivityForResult(intent, requestCode);
48. }
49. }

package com.kevin.intent;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 Main extends Activity implements OnClickListener{private Button btn_transfer;private EditText et_name;private int requestCode = 1;/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);btn_transfer = (Button) findViewById(R.id.button1);et_name = (EditText) findViewById(R.id.editText1);btn_transfer.setOnClickListener(this);}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {System.out.println("requestCode--->" + requestCode);// resultCode是第二个Activity返回过来的值switch (resultCode) {case RESULT_OK:// 获取Bundle对象Bundle returnedBundle = data.getExtras();String returnedName = returnedBundle.getString("name");et_name.setText(returnedName);break;default:break;}}@Overridepublic void onClick(View v) {// 取得et_name的值String name = et_name.getText().toString();Bundle bundle = new Bundle();bundle.putString("name", name);Intent intent = new Intent();intent.setClass(this, Activity_1.class);intent.putExtras(bundle);        // 启动Activity_1startActivityForResult(intent, requestCode);}}

跳转后的activity

Java代码  

1. package com.kevin.intent;
2. import android.app.Activity;
3. import android.content.Intent;
4. import android.os.Bundle;
5. import android.view.View;
6. import android.view.View.OnClickListener;
7. import android.widget.Button;
8. import android.widget.TextView;
9. public class Activity_1 extends Activity implements OnClickListener{
10. private Button btn_return;
11. private TextView textView;
12. private Intent intent;
13. /** Called when the activity is first created. */
14. @Override
15. public void onCreate(Bundle savedInstanceState) {
16. super.onCreate(savedInstanceState);
17. setContentView(R.layout.activity1);
18. intent = this.getIntent();
19. Bundle bundle = intent.getExtras();
20. String name = bundle.getString("name");
21. System.out.println("name --- >" + name);
22. textView = (TextView) findViewById(R.id.tv_receivedname);
23. textView.setText("传过来的name值为: " + name);
24. btn_return = (Button) findViewById(R.id.btn_return);
25. btn_return.setOnClickListener(this);
26. }
27. @Override
28. public void onClick(View v) {
29. // 点击返回按钮后，设置返回值
30. setResult(RESULT_OK, intent);
31. this.finish();
32. }
33. }

package com.kevin.intent;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 Activity_1 extends Activity implements OnClickListener{private Button btn_return;private TextView textView;private Intent intent;/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity1);intent = this.getIntent();Bundle bundle = intent.getExtras();String name = bundle.getString("name");System.out.println("name --- >" + name);textView = (TextView) findViewById(R.id.tv_receivedname);textView.setText("传过来的name值为: " + name);btn_return = (Button) findViewById(R.id.btn_return);btn_return.setOnClickListener(this);}@Overridepublic void onClick(View v) {// 点击返回按钮后，设置返回值setResult(RESULT_OK, intent);this.finish();}
}