Android实现限制EditText输入文字的数量

2022-08-25 08:45:44

一：声明控件。
      TextView hasnumTV;

      TextView hasnum;// 用来显示剩余字数

      int num = 50;// 限制的最大字数

二：主要的方法：

            hasnumTV = (TextView) findViewById(R.id.tv_num);
            hasnumTV.setText("限" + num + "" + "字以内");

            editText.addTextChangedListener(new TextWatcher() {
                     private CharSequence temp;
                     private int selectionStart;
                     private int selectionEnd;

                     @Override
                     public void onTextChanged(CharSequence s, int start, int before,
                                    int count) {
                     }

                     public void beforeTextChanged(CharSequence s, int start, int count,
                                    int after) {
                              temp = s;
                     }

                     public void afterTextChanged(Editable s) {
                              // TODO Auto-generated method stub
                              int number = num - s.length();
                              hasnumTV.setText("剩余" + "" + number + "个字");
                              selectionStart = editText.getSelectionStart();
                              selectionEnd = editText.getSelectionEnd();
                              if (temp.length() > num) {
                                    s.delete(selectionStart - 1, selectionEnd);
                                    int tempSelection = selectionEnd;
                                    editText.setText(s);
                                    editText.setSelection(tempSelection);// 设置光标在最后
                              }
                     }
            });

主要的效果是做到了输入的限制文字

Android实现限制EditText输入文字的数量,布布扣,bubuko.com

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