1.
dialEtBox.addTextChangedListener(new PhoneNumberWatcher());
2.
class PhoneNumberWatcher implements TextWatcher {
// 为什么会执行两次
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
System.out.println("beforeTextChanged--"
+ dialEtBox.getText().toString());
}
public void onTextChanged(CharSequence s, int start, int before,
int count) {
System.out.println("onTextChanged--"
+ dialEtBox.getText().toString());
}
public void afterTextChanged(Editable s) {
System.out.println("afterTextChanged--"
+ dialEtBox.getText().toString());
}
}
问题不是出自上面,而是,文本框中的文字改变的时候
public void updateEditText(String inputNumber)
{
String newNumber = dialEtBox.getText().append(inputNumber).toString();//问题所在!
dialEtBox.setText(newNumber);
}
改变EditText调用的是上面的方法
当执行
dialEtBox.getText().append(inputNumber)
实际上这里就已经执行了一次TextWatcher!!!
dialEtBox.setText(newNumber);
又执行了一次
需要注意的是:
dialEtBox.getText();返回的不是String,而是一个Editable对象
要将这个对象toString()之后再append内容!
改为这样就好了:
String newNumber =new StringBuilder(dialEtBox.getText().toString()).append(inputNumber).toString();
注意:先将EditText中的内容转为字符串dialEtBox.getText().toString()
,而不是仅仅dialEtBox.getText();
,这样返回的是一个Editable对象,对这个对象的append会内TextWatcher接收到!
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