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监听内容变化 TextWatcher @功能

摘要：
监听多个TextView的内容变化使用示例TextWatcherUtils.addTextChangedListener(isAllNotEmpty->btnLogin.setEnabled(isAllNotEmpty),etCode,etPhone);x1TextWatcherUtils.addTextChangedListener(isAllNotEmpty->btnLogin.setEnab

监听多个TextView的内容变化

使用示例
TextWatcherUtils.addTextChangedListener(isAllNotEmpty -> btnLogin.setEnabled(isAllNotEmpty), etCode, etPhone);
x
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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
 *
 * @author 白乾涛 <p>
 * @tag 内容变化<p>
 * @date 2018/5/22 22:01 <p>
 */
public class TextWatcherUtils {
	public interface OnTextChangedListener {
		void onTextChanged(boolean isAllNotEmpty);
	}
	public static void addTextChangedListener(OnTextChangedListener listener, TextView... tvs) {
		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) {
					if (listener != null) {
						listener.onTextChanged(isAllTextViewNotEmpty(tvs));
					}
				}
			});
		}
	}
	private static boolean isAllTextViewNotEmpty(TextView[] tvs) {
		for (TextView tv : tvs) {
			if (TextUtils.isEmpty(tv.getText())) {
				return false;
			}
		}
		return true;
	}
}
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1
/**
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 * 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
3
 *
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 * @author 白乾涛 <p>
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 * @tag 内容变化<p>
6
 * @date 2018/5/22 22:01 <p>
7
 */
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public class TextWatcherUtils {
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    public interface OnTextChangedListener {
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        void onTextChanged(boolean isAllNotEmpty);
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    }
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    public static void addTextChangedListener(OnTextChangedListener listener, TextView... tvs) {
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        for (TextView textView : tvs) {
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            textView.addTextChangedListener(new TextWatcher() {
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                @Override
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                public void beforeTextChanged(CharSequence s, int start, int count, int after) {
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                }
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                @Override
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                public void onTextChanged(CharSequence s, int start, int before, int count) {
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                }
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                @Override
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                public void afterTextChanged(Editable s) {
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                    if (listener != null) {
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                        listener.onTextChanged(isAllTextViewNotEmpty(tvs));
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                    }
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                }
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            });
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        }
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    }
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    private static boolean isAllTextViewNotEmpty(TextView[] tvs) {
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        for (TextView tv : tvs) {
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            if (TextUtils.isEmpty(tv.getText())) {
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                return false;
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            }
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        }
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        return true;
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    }
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}

仿QQ、微信、钉钉的@功能 案例

功能
1、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
2、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
3、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;
      }
   }
}
x
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public class MainActivity extends Activity {
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  private ArrayList<String> selectedIds = new ArrayList<>();
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  private ArrayList<SimpleBean> indexs = new ArrayList<SimpleBean>();
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  private EditText et;
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  protected void onCreate(Bundle savedInstanceState) {
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   super.onCreate(savedInstanceState);
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   et = new EditText(this);
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   setContentView(et);
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   et.addTextChangedListener(new TextWatcher() {
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     @Override
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     public void beforeTextChanged(CharSequence s, int start, int count, int after) {
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      //This method is called to notify you that,
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      // within [s], the [count] characters beginning at [start] are about to be replaced by new text with length [after].
16
      // It is an error to attempt to make changes to s from this callback.
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      //Log.i("bqt", "【beforeTextChanged】" + s + "  " + start + "  " + after + "  " + count);
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     }
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     @Override
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     public void onTextChanged(CharSequence s, int start, int before, int count) {
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      //This method is called to notify you that,
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      //within [s], the [count] characters beginning at [start] have just replaced old text that had length [before].
24
      //It is an error to attempt to make changes to [s] from this callback.
25
      //在s中，从start位置开始，有before个字符被count个字符【替换】了
26
      //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
27
      //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
28
29
      //*************************************************测试代码*****************************************
30
      Log.i("bqt", "【onTextChanged】" + s + "  " + start + "  " + before + "  " + count);
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      if (before == 0) Log.i("bqt", "【直接增加了一些字符】" + start + " " + count + " " + before);
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      else {//替换或减少了一些字符
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        if (count - before > 0) Log.i("bqt", "【替换后增加了一些字符】" + start + " " + count + " " + before);
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        else if (count - before == 0) Log.i("bqt", "【替换后字符个数没有变】" + start + " " + count + " " + before);
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        else {
36
         if (count == 0) Log.i("bqt", "【直接减少了一些字符】" + start + " " + count + " " + before);
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         else Log.i("bqt", "【替换后减少了一些字符】" + start + " " + count + " " + before);
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        }
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       }
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      //***********************************************@逻辑代码*******************************************
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      if (before != 0 && count - before < 0) {//如果是减少了一些字符
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        for (final SimpleBean sbean : indexs) {
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         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
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           if (selectedIds != null) selectedIds.remove(sbean.userAlias);//如果是的话，在@列表中去除此昵称
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           Log.i("bqt", "【删除掉文本框中的此昵称】");
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           et.postDelayed(new Runnable() {
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            @Override
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            public void run() {
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              et.getEditableText().replace(sbean.start, sbean.end, "");//删除掉文本框中的此昵称
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             }
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           }, 100);
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          }
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        }
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       }
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      for (SimpleBean sbean : indexs) {
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        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
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         Log.i("bqt", "【在某个昵称之间_替换_了一些字符】" + sbean.start + " " + start + " " + sbean.end);
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         if (selectedIds != null) selectedIds.remove(sbean.userAlias);//如果是的话，在@列表中去除此昵称
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        }
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       }
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      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
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        showSingleChoiceDialog();
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       }
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     }
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     @Override
70
     public void afterTextChanged(Editable s) {
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      //Log.i("bqt", "【afterTextChanged】" + s.toString());
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      indexs.clear();//先清空
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      //当输入内容后把所有信息封装起来
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      if (selectedIds != null && selectedIds.size() > 0) {
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        for (String userAlias : selectedIds) {
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         String newUserAlias = "@" + userAlias;
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         int startIndex = et.getText().toString().indexOf(newUserAlias);//注意。这里把@加进去了
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         int endIndex = startIndex + newUserAlias.length();
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         indexs.add(new SimpleBean(userAlias, startIndex, endIndex));
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         Log.i("bqt", userAlias + "的【边界值】" + startIndex + "  " + endIndex);
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        }
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        Log.i("bqt", "【选择的id有：】" + Arrays.toString(selectedIds.toArray(new String[selectedIds.size()])));
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       }
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     }
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    });
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  }
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  //单选对话框
89
  public void showSingleChoiceDialog() {
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   final String[] items = {"白乾涛", "包青天", "baiqiantao"};
91
   AlertDialog dialog = new AlertDialog.Builder(this)//
92
       .setTitle("请选择")//
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       .setPositiveButton("确定", null).setNegativeButton("取消", null)
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       .setSingleChoiceItems(items, -1, new DialogInterface.OnClickListener() {
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        public void onClick(DialogInterface dialog, int which) {
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         if (selectedIds == null) selectedIds = new ArrayList<>();
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         selectedIds.add(items[which]);//先把选择的内容存起来再更改EditText中的内容
98
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         //先把选择的内容存起来再更改EditText中的内容，顺序不能反
100
         int index = et.getSelectionStart();//获取光标所在位置
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         et.getEditableText().insert(index, items[which] + " ");//在光标所在位置插入文字
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         dialog.dismiss();
103
        }
104
       })
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       .create();
106
   dialog.show();
107
  }
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  static class SimpleBean {
110
   public int start;
111
   public int end;
112
   public String userAlias;
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   public SimpleBean(String userAlias, int start, int end) {
115
     this.userAlias = userAlias;
116
     this.start = start;
117
     this.end = end;
118
    }
119
  }
120
}

2018-5-22

来自为知笔记(Wiz)

浏览：246 | 发布日期：

免责声明：文章转载自《监听内容变化 TextWatcher @功能》仅用于学习参考。如对内容有疑问，请及时联系本站处理。

上篇无法识别的属性“targetFramework”的解决方法hello MemSQL 入门安装演示样例下篇

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