Android接收多页面回传值startActivityForResult(发送请求) onActivityResult(接收结果).docx

Android接受多页面回传值startActivityForResult和onActivityResult详解方法：startActivityForResult(发送请求)，setResult(回传结果); onActivityResult(接收结果)startActivityForResult顾名思义为：为了获取结果开启activity页面，所以，和startActivity不同的是，startActivity新开的页面，回传值不能关闭新开的页面，同时，不能用于同一个页面接收多个页面传回来的值。startActivityForResult(intent, 2);里面包括了，请求码2，也就是有个带着requestCode指令2到intent这个新页面去拿值，只要intent这个页面回传时：用setResult(3,intentMain);回传到需要取值的页面，也就是带着3这个resultCode回传回刚才的intentMain页面，回传后，随便可以关闭这个新开intent的页面也是可以的。这样结果就回到需要值的那个intentMain页面上了。然后,回传到了intentMain这个页面上的值，需要获取，怎么获取呢？这时：用onActivityResult（这个是继承Activity，所覆盖的方法）protected void onActivityResult(int requestCode, int resultCode, Intent data) switch(requestCode)case 1: Bundle bundle = data.getExtras();System.out.println(requestCode:+requestCode);System.out.println(resultCode:+resultCode);System.out.println(A页面：+bundle.getString(name_1);break;case 2:System.out.println(requestCode:+requestCode);System.out.println(resultCode:+resultCode);System.out.println(B页面：+data.getStringExtra(name_2);break;default:break;这样就可以接收完成需要的值了下面举个例子：MainActivity(主页面：需要接收A和B页面值的主页):public class MainActivity extends Activityprivate TextView get_data;Overridepublic void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState);this.setContentView(R.layout.activity_main);get_data = (TextView)findViewById(R.id.get_data);protected void onActivityResult(int requestCode, int resultCode, Intent data) switch(requestCode)case 1: if(resultCode=3)Bundle bundle = data.getExtras();System.out.println(requestCode:+requestCode);System.out.println(resultCode:+resultCode);System.out.println(A页面：+bundle.getString(name_1);get_data.setText(bundle.getString(name_1);break;case 2:System.out.println(requestCode:+requestCode);System.out.println(resultCode:+resultCode);System.out.println(B页面：+data.getStringExtra(name_2);get_data.setText(data.getStringExtra(name_2);break;default:get_data.setText(没有传成功);break;public void open_A(View v)Intent intent = new Intent(this,A.class);startActivityForResult(intent, 1);public void open_B(View v)Intent intent = new Intent(this,B.class);startActivityForResult(intent, 2);A.java(A页面)public class A extends Activityprivate EditText a_post_data;Overridepublic void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState);this.setContentView(R.layout.a);a_post_data = (EditText)findViewById(R.id.a_post_data);public void return_main_a(View v)Intent intent = new Intent(this,MainActivity.class);String name_1 = a_post_data.getText().toString();Bundle bundle = new Bundle();bundle.putString(name_1, name_1);intent.putExtras(bundle);setResult(3, intent);this.finish();B.java(B页面)public class B extends Activityprivate EditText b_post_data;Overridepublic void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState);this.setContentView(R.layout.b);b_post_data = (EditText)findViewById(R.id.b_post_data);public void return_main_b(View v)Intent intent = new Intent(this,MainActivity.class);String name_2 = b_post_data.getText().toString();intent.putExtra(name_2, name_2);setResult(RESULT_OK, intent);其中：A页面中的resultCode为3；B页面中的resultCode为RESULT_OK；RE