android意图传递参数返回结果（六）

例如，有两页a，b。

a参数传递到页面b页面，b后，将获得的参数的处理页，然后将结果传回与参数的页面a.

1.a主页MainActivity的代码类型，如以下：

    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() {
			
			@Override
			public 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);
    		}
    	}
    }
    

将參数a传入到b页面,onActivityResult函数处理将b页面传过来的參数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參数后，将c參数传入回来给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">			@Override
			public 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();
				}
			});

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