RxAndroid 的示例

最新推荐文章于 2021-11-30 15:49:19 发布

翻译最新推荐文章于 2021-11-30 15:49:19 发布 · 8.5k 阅读

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#RxAndroid Lambda

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本文通过具体示例介绍RxJava在Android开发中的使用方法，包括观察文本变化、验证输入合法性及更新UI等操作，展示了如何利用RxJava简化异步编程。

原文地址：

http://sglora.com/android-tutorial-sobre-rxjava-i-lo-basico/

https://ykode.github.io/2015/02/20/android-frp-rxjava-retrolambda.html

getUserName().subscribe(
  // On Next
  mUserNameTextView::setText,  
  // OnError
  throwable -> Log.e(TAG, throwable.getMessage(), throwable),
  // OnComplete
  () -> mLoadingProgressBar.setVisibility(View.GONE)
);

getUser()
    .subscribeOn(Schedulers.io())
    .observeOn(AndroidSchedulers.mainThread())
    .subscribe(user -> Log.d(TAG, "User = " + user),
               error -> Log.e(TAG, error.getMessage(), error),
               () -> Log.d(TAG, "Complete") );

附带Java8 lambda 语法 http://zh.lucida.me/blog/java-8-lambdas-insideout-language-features/

protected void onStart() {
  super.onStart();

  Observable<OnTextChangeEvent> userNameText = 
    WidgetObservable.text((EditText) findViewById(R.id.edtUserName));

  userNameText.subscribe( e -> Log.d("[Rx]", e.text().toString()));
}

 @Override
    protected void onStart() {
        super.onStart();

        final Pattern emailPattern = Pattern.compile(
                "^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@"
                + "[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$"); // ..... [1]

        EditText unameEdit = (EditText) findViewById(R.id.edtUserName);
        EditText emailEdit = (EditText) findViewById(R.id.edtEmail);

        Observable<Boolean> userNameValid = WidgetObservable.text(unameEdit) //  [2]
                .map(e -> e.text())
                .map(t -> t.length() > 4);                                     

        Observable<Boolean> emailValid = WidgetObservable.text(emailEdit) 
                .map(e -> e.text())
                .map(t -> emailPattern.matcher(t).matches());

        emailValid.map(b -> b ? Color.BLACK : Color.RED)
                .subscribe( color -> emailEdit.setTextColor(color));     // ... [3]

        userNameValid.map( b -> b ? Color.BLACK : Color.RED)
                .subscribe( color -> userNameEdit.setTextColor(color));  


    }

Button registerButton = (Button) findViewById(R.id.buttonRegister);

Observable<Boolean> registerEnabled = 
  Observable.combineLatest(userNameValid, emailValid, (a,b) -> a && b);
registerEnabled.subscribe( enabled -> registerButton.setEnabled(enabled));

emailValid.doOnNext( b -> Log.d("[Rx]", "Email " + (b ? "Valid" : "Invalid")))
  .map(b -> b ? Color.BLACK : Color.RED)
  .subscribe(color -> emailEdit.setTextColor(color));

userNameValid.doOnNext( b -> Log.d("[Rx]", "Uname " + (b ? "Valid" : "Invalid")))
  .map(b -> b ? Color.BLACK : Color.RED)
  .subscribe(color -> userNameEdit.setTextColor(color));

// and the registerenabled

registerEnabled.doOnNext( b -> Log.d("[Rx]", "Button " + (b ? "Enabled" : "Disabled")))
  .subscribe( enabled -> registerButton.setEnabled(enabled));

emailValid.distinctUntilChanged()
  .doOnNext( b -> Log.d("[Rx]", "Email " + (b ? "Valid" : "Invalid")))
  .map(b -> b ? Color.BLACK : Color.RED)
  .subscribe(color -> emailEdit.setTextColor(color));

userNameValid.distinctUntilChanged()
  .doOnNext( b -> Log.d("[Rx]", "Uname " + (b ? "Valid" : "Invalid")))
  .map(b -> b ? Color.BLACK : Color.RED)
  .subscribe(color -> userNameEdit.setTextColor(color));

// and registerEnabled

registerEnabled.distinctUntilChanged()
  .doOnNext( b -> Log.d("[Rx]", "Button " + (b ? "Enabled" : "Disabled")))
  .subscribe( enabled -> registerButton.setEnabled(enabled));

github https://github.com/ykode/RxSample