TextWatcher 用于多个 EditText

问题描述

我想为多个EditText 字段实现TextWatcher 接口.目前我正在使用:

I want to implement the TextWatcher interface for more than one EditText fields. Currently I am using :

text1.addTextChangedListener(this);
text2.addTextChangedListener(this);

然后覆盖我的 Activity 中的方法:

then overriding the methods in my Activity:

public void afterTextChanged(Editable s) {}

public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
public void onTextChanged(CharSequence s, int start, int before, int count) 
{
 // do some operation on text of text1 field
 // do some operation on text of text2 field 
}

但是这工作正常，但我正在寻找其他方法，以便我可以明确识别 SoftKeyboard 当前关注的 EditText 字段.

However this is working fine but I'm looking for other ways so that I can explicitly identify that in which EditText field the SoftKeyboard is currently focused.

推荐答案

@Sebastian Roth 的回答中建议的解决方案不是一些 EditTexts 的 TextWatcher 实例.对于 n EditTexts，它是一个类和该类的 n 个实例.

Suggested solution in @Sebastian Roth's answer is not one instance of TextWatcher for some EditTexts. It is one class and n instances of that class for n EditTexts.

每个 EditText 都有自己的 Spannable.TextWatcher 的事件有这个 Spannable 作为 s 参数.我检查他们的 hashCode (每个对象的唯一 ID).myEditText1.getText() 返回 Spannable.因此，如果 myEditText1.getText().hashCode() 等于 s.hashCode() 这意味着 s 属于 myEditText1

Each EditText has its own Spannable. TextWatcher's events has this Spannable as s parameter. I check their hashCode (unique Id of each object). myEditText1.getText() returns that Spannable. So if the myEditText1.getText().hashCode() equals with s.hashCode() it means that s belongs to myEditText1

因此，如果您想为某些 EditTexts 提供一个 TextWatcher 实例，您应该使用这个:

So if you want to have one instance of TextWatcher for some EditTexts you should use this:

private TextWatcher generalTextWatcher = new TextWatcher() {    

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

        if (myEditText1.getText().hashCode() == s.hashCode())
        {
            myEditText1_onTextChanged(s, start, before, count);
        }
        else if (myEditText2.getText().hashCode() == s.hashCode())
        {
            myEditText2_onTextChanged(s, start, before, count);
        }
    }

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

        if (myEditText1.getText().hashCode() == s.hashCode())
        {
            myEditText1_beforeTextChanged(s, start, count, after);
        }
        else if (myEditText2.getText().hashCode() == s.hashCode())
        {
            myEditText2_beforeTextChanged(s, start, count, after);
        }
    }

    @Override
    public void afterTextChanged(Editable s) {
        if (myEditText1.getText().hashCode() == s.hashCode())
        {
            myEditText1_afterTextChanged(s);
        }
        else if (myEditText2.getText().hashCode() == s.hashCode())
        {
            myEditText2_afterTextChanged(s);
        }
    }

};

和

myEditText1.addTextChangedListener(generalTextWatcher);
myEditText2.addTextChangedListener(generalTextWatcher);

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