监听内容变化 TextWatcher @功能 [MD]
| 我的GitHub | 我的博客 | 我的微信 | 我的邮箱 |
|---|---|---|---|
| baiqiantao | baiqiantao | bqt20094 | baiqiantao@sina.com |
目录
监听多个 TextView 内容变化
使用示例
TextWatcherUtils.addTextChangedListener(isAllNotEmpty -> btnLogin.setEnabled(isAllNotEmpty), etCode, etPhone);
/**
* Desc：用于监听多个 TextView 的内容变化，常用于判断在登录注册时同时判断多个 EditText 是否都有输入内容，以判断是否允许点击下一步
*/
public class TextWatcherUtils {
public interface OnTextChangedListener {
void onTextChanged(boolean isAllNotEmpty);
}
public static void addTextChangedListener(OnTextChangedListener listener, TextView... tvs) {//可变参数
if (listener == null || tvs == null || tvs.length == 0) return;
for (TextView textView : tvs) {
textView.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
listener.onTextChanged(isAllTextViewNotEmpty(tvs));
}
});
}
}
private static boolean isAllTextViewNotEmpty(TextView[] tvs) {
for (TextView tv : tvs) {
if (TextUtils.isEmpty(tv.getText())) {
return false;
}
}
return true;
}
}
监听多个 TextView 内容变化：增强版
使用示例
TextWatcherUtils.addTextChangedListener(isAllMatch -> btnNext.setEnabled(isAllMatch),
new TextView[]{etCode, etPhone, etPassword},
new int[]{TextWatcherUtils.TYPE_NOT_EMPTY, TextWatcherUtils.TYPE_PHONE, TextWatcherUtils.TYPE_PASSWORD});
public class TextWatcherUtils {
public interface OnTextChangedListener {
void onTextChanged(boolean isAllMatch);
}
public static void addTextChangedListener(OnTextChangedListener listener, TextView[] tvs, int[] inputTypes) {//验证是否符合正则
if (listener == null || tvs == null || inputTypes == null || tvs.length != inputTypes.length || tvs.length == 0) return;
for (TextView textView : tvs) {
textView.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
boolean isAllMatch = isAllMatch(tvs, inputTypes);
listener.onTextChanged(isAllMatch);
}
});
}
}
public static void addTextChangedListener(OnTextChangedListener listener, TextView... tvs) {//可变参数
if (listener == null || tvs == null || tvs.length == 0) return;
for (TextView textView : tvs) {
textView.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
listener.onTextChanged(isAllTextViewNotEmpty(tvs));
}
});
}
}
private static boolean isAllTextViewNotEmpty(TextView[] tvs) {
for (TextView tv : tvs) {
if (TextUtils.isEmpty(tv.getText())) {
return false;
}
}
return true;
}
private static boolean isAllMatch(TextView[] tvs, int[] inputTypes) {
for (int i = 0; i < tvs.length; i++) {
//逐个判断是否符合对应的正则表达式，这里采用的是通过指定类型来判断，你也可以采取通过制定整治表达式来判断
CharSequence text = tvs[i].getText();
switch (inputTypes[i]) {
case TYPE_NOT_EMPTY:
if (TextUtils.isEmpty(text)) return false;//为空
break;
case TYPE_PHONE:
if (!RegUtils.isPhoneNumber(text)) return false;//不符合手机号规则
break;
case TYPE_PASSWORD:
if (!RegUtils.isPassword(text)) return false;//不符合密码规则
break;
}
}
return true;
}
public static final int TYPE_NOT_EMPTY = 0;
public static final int TYPE_PHONE = 1;
public static final int TYPE_PASSWORD = 2;
}
仿QQ、微信、钉钉的@功能
功能
- 如果增加或减少或替换后改变的文本以
@结尾，则弹出选择成员界面 - 如果在【某个昵称之间】增加或减少或替换了一些字符，则在
@列表中去除此昵称 - 如果是在紧挨着某个昵称之后减少了一些字符，则删除掉文本框中的此昵称，并在
@列表中去除此昵称
public class MainActivity extends Activity {
private ArrayList<String> selectedIds = new ArrayList<>();
private ArrayList<SimpleBean> indexs = new ArrayList<SimpleBean>();
private EditText et;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
et = new EditText(this);
setContentView(et);
et.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
//This method is called to notify you that,
// within [s], the [count] characters beginning at [start] are about to be replaced by new text with length [after].
// It is an error to attempt to make changes to s from this callback.
//Log.i("bqt", "【beforeTextChanged】" + s + " " + start + " " + after + " " + count);
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
//This method is called to notify you that,
//within [s], the [count] characters beginning at [start] have just replaced old text that had length [before].
//It is an error to attempt to make changes to [s] from this callback.
//在s中，从start位置开始，有before个字符被count个字符【替换】了
//s 表示改变后输入框中的字符串，start 表示内容是从哪个位置(从0开始)开始改变的
//如果before!=0，代表字符被替换了(可能增加了也可能减少了)；如果before=0，可以确定是增加了count个字符
//*************************************************测试代码*****************************************
Log.i("bqt", "【onTextChanged】" + s + " " + start + " " + before + " " + count);
if (before == 0) Log.i("bqt", "【直接增加了一些字符】" + start + " " + count + " " + before);
else {//替换或减少了一些字符
if (count - before > 0) Log.i("bqt", "【替换后增加了一些字符】" + start + " " + count + " " + before);
else if (count - before == 0) Log.i("bqt", "【替换后字符个数没有变】" + start + " " + count + " " + before);
else {
if (count == 0) Log.i("bqt", "【直接减少了一些字符】" + start + " " + count + " " + before);
else Log.i("bqt", "【替换后减少了一些字符】" + start + " " + count + " " + before);
}
}
//***********************************************@逻辑代码*******************************************
if (before != 0 && count - before < 0) {//如果是减少了一些字符
for (final SimpleBean sbean : indexs) {
if (start == sbean.end || start == sbean.end - 1) {//如果是在某个昵称之后减少了一些字符
if (selectedIds != null) selectedIds.remove(sbean.userAlias);//如果是的话，在@列表中去除此昵称
Log.i("bqt", "【删除掉文本框中的此昵称】");
et.postDelayed(new Runnable() {
@Override
public void run() {
et.getEditableText().replace(sbean.start, sbean.end, "");//删除掉文本框中的此昵称
}
}, 100);
}
}
}
for (SimpleBean sbean : indexs) {
if (start > sbean.start && start < sbean.end) {//是否在【某个昵称之间】增加或减少或替换了一些字符
Log.i("bqt", "【在某个昵称之间_替换_了一些字符】" + sbean.start + " " + start + " " + sbean.end);
if (selectedIds != null) selectedIds.remove(sbean.userAlias);//如果是的话，在@列表中去除此昵称
}
}
if (start + count - 1 >= 0 && s.toString().charAt(start + count - 1) == '@') {//如果增加或减少或替换后改变的文本以@结尾
showSingleChoiceDialog();
}
}
@Override
public void afterTextChanged(Editable s) {
//Log.i("bqt", "【afterTextChanged】" + s.toString());
indexs.clear();//先清空
//当输入内容后把所有信息封装起来
if (selectedIds != null && selectedIds.size() > 0) {
for (String userAlias : selectedIds) {
String newUserAlias = "@" + userAlias;
int startIndex = et.getText().toString().indexOf(newUserAlias);//注意。这里把@加进去了
int endIndex = startIndex + newUserAlias.length();
indexs.add(new SimpleBean(userAlias, startIndex, endIndex));
Log.i("bqt", userAlias + "的【边界值】" + startIndex + " " + endIndex);
}
Log.i("bqt", "【选择的id有：】" + Arrays.toString(selectedIds.toArray(new String[selectedIds.size()])));
}
}
});
}
//单选对话框
public void showSingleChoiceDialog() {
final String[] items = {"白乾涛", "包青天", "baiqiantao"};
AlertDialog dialog = new AlertDialog.Builder(this)//
.setTitle("请选择")//
.setPositiveButton("确定", null).setNegativeButton("取消", null)
.setSingleChoiceItems(items, -1, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
if (selectedIds == null) selectedIds = new ArrayList<>();
selectedIds.add(items[which]);//先把选择的内容存起来再更改EditText中的内容
//先把选择的内容存起来再更改EditText中的内容，顺序不能反
int index = et.getSelectionStart();//获取光标所在位置
et.getEditableText().insert(index, items[which] + " ");//在光标所在位置插入文字
dialog.dismiss();
}
})
.create();
dialog.show();
}
static class SimpleBean {
public int start;
public int end;
public String userAlias;
public SimpleBean(String userAlias, int start, int end) {
this.userAlias = userAlias;
this.start = start;
this.end = end;
}
}
}
2016-11-29
本文来自博客园，作者：白乾涛，转载请注明原文链接：https://www.cnblogs.com/baiqiantao/p/6114787.html
