Android中根据EditText中的文本启用和禁用Button [英] Enable and disable Button according to the text in EditText in Android

问题描述

如果 EditText 中的单词少于 3 个单词，我想通过 Button 禁用，如果 EditText 中的单词超过 3 个单词，那么我想启用它以便它可以被点击.

I want to disable by Button if the words in the EditText is less than 3 words, and if the words in the EditText are more than 3 words then I want to enable it so that it can get Clicked.

有人可以帮我吗?

推荐答案

你必须将 addTextChangedListener 加入你的 EditText

You have to addTextChangedListener to your EditText

像这样:

yourEditText.addTextChangedListener(new TextWatcher() {
      @Override
      public void afterTextChanged(Editable arg0) {
         enableSubmitIfReady();
      }

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

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

在那个方法中，你应该这样做:

In that method, you should do like this:

 public void enableSubmitIfReady() {

    boolean isReady = yourEditText.getText().toString().length() > 3;    
    yourbutton.setEnabled(isReady);
  }

希望有帮助.

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