Android登录的简单处理

public class GoLoginUtil {

 public static final String CLASSNAME = "className";

 public static final int CODE_LOGIN = 1; // 登录成功回调 用于onActivityForResult 判断


 /**
  * 登录成功之后，通过 activityResult 回调到当前界面
  *
  * @param activity
  * @param intent
  * @param requestCode
  */
 private static void startActivity(Activity activity, Intent intent, int requestCode) {
  if (requestCode == -1) {
   String targetClass = intent.getComponent().getClassName(); // 目标类
   intent.putExtra(CLASSNAME, targetClass);
  }
  intent.setClass(activity, LoginActivity.class); // 跳转重定向到登录界面
  activity.startActivityForResult(intent, requestCode);
 }


 /**
  * 登录成功之后，直接跳转目标 Activity
  *
  * @param activity
  * @param intent
  */
 public static void startActivity(Activity activity, Intent intent) {
  startActivity(activity, intent, -1);
 }

 /**
  * 登录成功回调到当前界面
  * 使用 onActivityResult 方法接收， requestCode = CODE_LOGIN
  *
  * @param activity
  * @param intent
  */
 public static void startActivityForResult(Activity activity, Intent intent) {
  startActivity(activity, intent, CODE_LOGIN);
 }

}

public class IntentUtil {

 public static boolean isLogin; // 模拟获取当前用户登录状态。

 /**
  * 需要登录判断
  *
  * @param activity
  * @param clazz
  * @param bundle
  */
 public static void startToLogin(Activity activity, Class clazz, Bundle bundle) {
  Intent intent = new Intent(activity, clazz);
  if (bundle != null) {
   intent.putExtras(bundle);
  }
  if (isLogin) {
   activity.startActivity(intent);
  } else {
   GoLoginUtil.startActivity(activity, intent);
  }
 }

 /**
  * 登录成功会有回调
  * requestCode = Contants.CODE_LOGIN
  *
  * @param activity
  * @param bundle
  */
 public static void startToLoginResult(Activity activity, Bundle bundle) {
  Intent intent = new Intent();
  if (bundle != null) {
   intent.putExtras(bundle);
  }
  GoLoginUtil.startActivityForResult(activity, intent);
 }
}

public class LoginActivity extends FragmentActivity {

 private String targetClass;

 @Override
 protected void onCreate(@Nullable Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_login);
  targetClass = getIntent().getStringExtra(GoLoginUtil.CLASSNAME); // 目标跳转类


 }

 public void onLoginClick(View view) {
  // 模拟登录成功操作
  if (!TextUtils.isEmpty(targetClass)) {
   // 这里就是执行继续跳转操作
   try {
    Class clazz = Class.forName(targetClass);
    getIntent().setClass(this, clazz);
    startActivity(getIntent());
    finish();
   } catch (ClassNotFoundException e) {
    e.printStackTrace();
   }
  } else {
   // 这里是登录成功，回调到之前界面 onActivityForResult()中 方法可根据自己需求处理。。
   setResult(RESULT_OK);
   finish();
  }
 }
}

/**
  * 登录跳转
  *
  * @param view
  */
 public void onClick1(View view) {
  Bundle bundle = new Bundle();
  bundle.putString("content", et_content.getText().toString());
  IntentUtil.startToLogin(this, LoginSuccessActivity.class, bundle);
 }

 /**
  * 登录回调
  *
  * @param view
  */
 public void onClick2(View view) {
  if (!IntentUtil.isLogin) {
   IntentUtil.startToLoginResult(this, null);
  } else {
   tv_text.setText("登录成功");
  }
 }

 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  if (resultCode != RESULT_OK) {
   return;
  }
  if (requestCode == CODE_LOGIN) {
   tv_text.setText("登录成功");
  }
 }