android edittext在输入手机号码的时候自动添加分隔符

短命女 2022-08-27 01:11 300阅读 0赞

在输入框输入手机号码，例如13800138000，变成3-4-4的格式

当输入138后面的0的时候，自动添加一个"-"，变成138-0的格式；  
当输入到138-0013后面的8的时候，自动变成138-0013-8000的格式。

在网上看到有人提出该问题，在此我就给出解答：

package com.example.edittest;
    
    import android.app.Activity;
    import android.os.Bundle;
    import android.text.Editable;
    import android.text.TextWatcher;
    import android.util.Log;
    import android.view.Menu;
    import android.widget.EditText;
    
    public class MainActivity extends Activity implements TextWatcher {
    	private static final String TAG = "MainActivity";
    
    	private static final char SEPARATOR = '-';
    	private static final int FIRST_SEPARATOR_POSITION = 3;
    	private static final int SECOND_SEPARATOR_POSITION = 7;
    
    	private EditText mPhoneNumberET;
    
    	@Override
    	protected void onCreate(Bundle savedInstanceState) {
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.activity_main);
    
    		mPhoneNumberET = (EditText) findViewById(R.id.edit);
    		mPhoneNumberET.addTextChangedListener(this);
    	}
    
    	@Override
    	public boolean onCreateOptionsMenu(Menu menu) {
    		// Inflate the menu; this adds items to the action bar if it is present.
    		getMenuInflater().inflate(R.menu.main, menu);
    		return true;
    	}
    
    	@Override
    	public void afterTextChanged(Editable aEditable) {
    		Log.d(TAG, "afterTextChanged: " + aEditable.toString());
    	}
    
    	@Override
    	public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    		Log.d(TAG, "beforeTextChanged: " + s + ", " + start + ", " + after + ", " + count);
    	}
    
    	@Override
    	public void onTextChanged(CharSequence s, int start, int before, int count) {
    		Log.d(TAG, "onTextChanged: " + s + ", " + start + ", " + before + ", " + count);
    
    		Editable phoneNumberEditable = mPhoneNumberET.getEditableText();
    
    		if (before == 1) {
    			if ((start == FIRST_SEPARATOR_POSITION) || (start == (SECOND_SEPARATOR_POSITION + 1))) {
    				return;
    			}
    		}
    
    		switch (parsePhoneNumber(phoneNumberEditable.toString())) {
    		case 1:
    			int oneInvalidSeparatorIndex = getOneInvalidSeparatorIndex(phoneNumberEditable.toString());
    			phoneNumberEditable.delete(oneInvalidSeparatorIndex, oneInvalidSeparatorIndex + 1);//删除该“-”
    			break;
    
    		case 2:
    			phoneNumberEditable.insert(FIRST_SEPARATOR_POSITION, String.valueOf(SEPARATOR));
    			break;
    
    		case 3:
    			phoneNumberEditable.insert(SECOND_SEPARATOR_POSITION + 1, String.valueOf(SEPARATOR));
    			break;
    
    		case 4:
    			phoneNumberEditable.delete(phoneNumberEditable.length() - 1, phoneNumberEditable.length());
    			break;
    
    		case -1:
    		case 0:
    		default:
    			break;
    		}
    	}
    
    	/*
    	 * -1. Invalid.
    	 * 
    	 * 0. Formatted.
    	 * 
    	 * 1. Not formatted cause one index at least is a separator, except index 3
    	 * and index 7.
    	 * 
    	 * 2. Not formatted cause index 3 isn't a separator.
    	 * 
    	 * 3. Not formatted cause index 7 isn't a separator.
    	 * 
    	 * 4. Not formatted cause has a separator in the tail.
    	 */
    	private int parsePhoneNumber(String phoneNumber) {
    		if (phoneNumber == null) {
    			return -1;
    		}
    
    		if (getOneInvalidSeparatorIndex(phoneNumber) != -1) {//除index = 3和8是“-”以外，其他位置有“-”时，按1处理
    			return 1;
    		}
    
    		if ((phoneNumber.length() > FIRST_SEPARATOR_POSITION)//字符数超3个，同时index=3的字符不是“-”，则按2来处理
    				&& (phoneNumber.charAt(FIRST_SEPARATOR_POSITION) != SEPARATOR)) {
    			return 2;
    		}
    		if ((phoneNumber.length() > (SECOND_SEPARATOR_POSITION + 1))//字符数超8个，同时index=8的字符不是“-”，则按3来处理
    				&& (phoneNumber.charAt(SECOND_SEPARATOR_POSITION + 1) != SEPARATOR)) {
    			return 3;
    		}
    
    //		if ((phoneNumber.length() == (FIRST_SEPARATOR_POSITION + 1))
    //				|| (phoneNumber.length() == (SECOND_SEPARATOR_POSITION + 1 + 1))) {
    //			return 4;
    //		}
    		if(phoneNumber.length()>13)//超过长度，按4处理
    		{
    			return 4;
    		}
    
    		return 0;
    	}
    
    	/**
    	 * 除index = 3和8是“-”以外，其他位置有“-”时，返回该index
    	 * @param phoneNumber
    	 * @return
    	 */
    	
    	private int getOneInvalidSeparatorIndex(String phoneNumber) {
    		if (phoneNumber == null) {
    			return -1;
    		}
    
    		for (int index = 0; index < phoneNumber.length(); index++) {
    			if ((index == FIRST_SEPARATOR_POSITION) || (index == (SECOND_SEPARATOR_POSITION + 1))) {
    				continue;
    			}
    
    			if (phoneNumber.charAt(index) == SEPARATOR) {
    				return index;
    			}
    		}
    
    		return -1;
    	}
    }

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