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  • Android中TextView输入字数统计和限制 & [转]一篇

    对安卓控件的不熟悉真的是很浪费时间,之前还弄个函数来实现,花不少时间,后来发觉,xml里面设置一个android:maxLength="8"就够了。
    ===================

    这里转一篇函数实现的,Android中TextView输入字数统计和限制: (转自:http://lishuaishuai.iteye.com/blog/1128230)

    在Android开发应用的时候,文本编辑框中最多输入140个字,经常会显示还剩多少字以限制用户输入的字数,

      EditText content;//定义一个文本输入框

          TextView hasnum;// 用来显示剩余字数

          int num = 140;//限制的最大字数

      content = (EditText) findViewById(R.id.et_content);

          hasnumTV = (TextView) findViewById(R.id.tv_num);

          hasnumTV.setText(num+"");

      下面为EditText文本框添加监听

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

                      public void beforeTextChanged(CharSequence s, int start, int count, int after) {


                  }

              public void onTextChanged(CharSequence s, int start, int before, int count) {
                       temp = s;
                  }

                                     

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

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  • 原文地址:https://www.cnblogs.com/lionfight/p/2802537.html
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