android意图传参返回结果（六）

例如有两个页面a，b。a页面传参数到b页面，b页面将获得到的参数处理后，再将结果用参数传回来给页面a.

1.a页面的主要MainActivity类的代码如下：

    private Button button;    private EditText result;    private final static int REQUESTCODE = 1;

    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);                setContentView(R.layout.activity_main);        button = (Button)this.findViewById(R.id.button1);        result = (EditText)this.findViewById(R.id.result);                button.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stub

Intent intent = new Intent(MainActivity.this,OtherActivity.class);intent.putExtra("a", "true");startActivityForResult(intent,REQUESTCODE);}});            }

<pre name="code" class="html">    @Override    protected void onActivityResult(int requestCode,int resultCode,Intent data){    super.onActivityResult(requestCode, resultCode, data);    if(resultCode == 2){    if(requestCode == REQUESTCODE){

                        <span style="font-family: Arial, Helvetica, sans-serif;">String c= intent.getStringExtra("c");</span>    result.setText(c);    }    }    }    

将参数a传入到b页面,onActivityResult函数处理将b页面传过来的参数c

<span style="font-family: Arial, Helvetica, sans-serif;"></span>

<span style="font-family: Arial, Helvetica, sans-serif;">2.OtherActivity.java函数处理a参数后，将c参数传入回来给a页面. 在b页面的onCreate里面处理</span>

<span style="font-family: Arial, Helvetica, sans-serif;"></span><pre name="code" class="html">   <pre name="code" class="html">@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stub        Intent intent = getIntent();        String a = intent.getStringExtra("a");        String c;        if(a=="true"){        c = "It is True";        }else{        c = "It is false";        }        Intent newIntent = new Intent();newIntent.putExtra("c", c);setResult(2,intent);finish();}});