TextWatcher的使用

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实现接口的三个方法

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)

package com.example.androidtest;import android.os.Bundle;import android.app.Activity;import android.widget.EditText;import android.text.TextWatcher;import android.text.Editable;import java.text.NumberFormat;public class MainActivity extends Activity {EditText mText;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);             mText = new EditText(this);        setContentView(mText);    }    }class CurrencyTextWatcher implements TextWatcher{boolean mEditing;public CurrencyTextWatcher(){mEditing = false;}public synchronized void afterTextChanged(Editable s){if (!mEditing) {mEditing = true;String digits = s.toString().replace("\\D", "");NumberFormat nf = NumberFormat.getCurrencyInstance();try {String formmated = nf.format(Double.parseDouble(digits) / 100);s.replace(0, s.length(), formmated);} catch (NumberFormatException e) {s.clear();}mEditing = false;}}public void beforeTextChanged(CharSequence s, int start, int count, int after) { }    public void onTextChanged(CharSequence s, int start, int before, int count) { }}

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