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Activity跳转与返回

两个 Activity 跳转，都是在第一个 Activity 调用 startActivity() 方法启动第二个 Activity ，然后在第二个 Activity 调用 Context.finish() 方法实现返回到第一个 Activity 。但是有的时候业务需求很复杂，从第二个 Activity 返回到第一个 Activity 时候，需要再次处理某些事情时就要使用 startActivityForResult() 方法启动第二个 Activity 了，并在第一个 Activity 中重写 onActivityResult() 方法。

@Override

public void onCreate(Bundle savedInstanceState) {

          super.onCreate(savedInstanceState);

          setContentView(R.layout.main);

          btnLogin = (Button) findViewById(R.id.btnLogin);

          userid = (EditText) findViewById(R.id.userid);

          pwd = (EditText) findViewById(R.id.password);

          btnLogin.setOnClickListener(new View.OnClickListener() {

                   @Override

                   public void onClick(View v) {

                             if (userid.getText().toString().equals("tony")

                                               && pwd.getText().toString().equals("1")) {

                                      Intent it = new Intent(LoginActivity.this,

                                                         SuccessActivity.class);

                                      it.putExtra("userid", userid.getText().toString());

                                      startActivityForResult(it, 1);

                             } else {

                                      Intent it = new Intent(LoginActivity.this,

                                                         FailureActivity.class);

                                      startActivityForResult(it, 2);

                             }

                   }

          });

}

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

          switch (requestCode) {

          case 1:

                   // 登录成功之后返回的。

                   Log.v(TAG, "from success activity return. resultCode=" + resultCode);

                   break;

          case 2:

                   // 登录失败之后返回的。

                   Log.v(TAG, "from failure activity return. resultCode=" + resultCode);

          }

          super.onActivityResult(requestCode, resultCode, data);

}

}

成功屏幕 SuccessActivity