問題描述

我對 TextWatcher 了解一些，但它會在您輸入的每個字符上觸發.我想要一個在用戶完成編輯時觸發的監聽器.是否可以?同樣在 TextWatcher 中，我得到了一個 Editable 的實例，但我需要一個 EditText 的實例.我怎么得到它?

I know a little bit about TextWatcher but that fires on every character you enter. I want a listener that fires whenever the user finishes editing. Is it possible? Also in TextWatcher I get an instance of Editable but I need an instance of EditText. How do I get that?

EDIT:第二個問題更重要.請回答.

EDIT: the second question is more important. Please answer that.

推薦答案

首先，如果 EditText 失去焦點或用戶按下完成按鈕(這取決于您的實施以及最適合您的方式).其次，只有將 EditText 聲明為實例對象，才能在 TextWatcher 中獲取 EditText 實例.即使您不應該在 TextWatcher 中編輯 EditText，因為它不安全.

First, you can see if the user finished editing the text if the EditText loses focus or if the user presses the done button (this depends on your implementation and on what fits the best for you). Second, you can't get an EditText instance within the TextWatcher only if you have declared the EditText as an instance object. Even though you shouldn't edit the EditText within the TextWatcher because it is not safe.

為了能夠將 EditText 實例放入您的 TextWatcher 實現中，您應該嘗試這樣的操作:

To be able to get the EditText instance into your TextWatcher implementation, you should try something like this:

public class YourClass extends Activity {

    private EditText yourEditText;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);
        yourEditText = (EditText) findViewById(R.id.yourEditTextId);

        yourEditText.addTextChangedListener(new TextWatcher() {

            public void afterTextChanged(Editable s) {

                // you can call or do what you want with your EditText here

                // yourEditText... 
            }

            public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

            public void onTextChanged(CharSequence s, int start, int before, int count) {}
        });
    }
}

請注意，上面的示例可能有一些錯誤，但我只是想向您展示一個示例.

Note that the above sample might have some errors but I just wanted to show you an example.

這篇關于android edittext onchange 監聽器的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！