android intent 跳转

1、不须要返回值的跳转

Intent intent=new Intent();

intent.setClass(目前的acitivy.this, 目标activity.class);

startActivity(intent);

 

2、须要返回值的跳转

Intent intent=new Intent();

intent.setClass(目前的acitivy.this, 目标activity.class);

startActivity(intent);

startActivityForResult(intent, 状态值（int类型）);

状态值做为接受目标返回值的验证。

requestCode 接收返回的状态值

resultCode ：RESULT_OK  RESULT_CANCELED 能够本身赋值，按返回键时，系统默认赋值为：RESULT_CANCELED

目标activity 关闭才能返回请求activity

例如：

  一、请求页面

public class MainActivy extends Activity {
   
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Intent intent=new Intent();
        intent.setClass(MainActivy.this, ReceiveMSG.class);
        startActivityForResult(intent, 0);      
    }

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode==0) {
            if (resultCode==RESULT_OK) {
                Toast.makeText(this, "Send SMS RESULT_OK", Toast.LENGTH_SHORT).show();
            }else if (resultCode==RESULT_CANCELED) {
                Toast.makeText(this, "result cancel", Toast.LENGTH_SHORT).show();
            }else {
                Toast.makeText(this, resultCode, Toast.LENGTH_SHORT).show();
            }
        }else {
            Toast.makeText(this, "requsetcode not 0", Toast.LENGTH_SHORT).show();
        }
       
    }
}

二、接收返回值界面

public class ReceiveMSG extends Activity{

   protected void onCreate(Bundle savedInstanceState) {       // TODO Auto-generated method stub       super.onCreate(savedInstanceState);               ReceiveMSG.this.setResult(RESULT_OK);       this.finish();          }}