android如何在edittext中制作文本完全固定的行 [英] android how to make text in an edittext exactly fixed lines

问题描述

我想让 use 只输入 5 行，我试过了

I want to allow use to enter just 5 lines, I tried this

<EditText
    android:layout_below="@+id/tv_signup_descriptionError"
    android:id="@+id/et_signup_description"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="5dip"
    android:hint="@string/et_hint_enterDescription"
    android:singleLine="false"
    android:lines="5"
    android:gravity="top"
    android:scrollHorizontally="false"
    android:inputType="textMultiLine" 
    android:maxLines="5"/>

但我仍然可以在第五行之后按 Enter

but still I can press Enter after the fifth line

推荐答案

你不能使用任何 XML 属性来做到这一点.

You cannot do that using any XML attributes.

maxlines代表EditText的最大高度，不是输入行数.

maxlines represents the maximum height of the EditText and not the number of input lines.

但是，您可以实现自己的代码来检查行数.

You can however implement your own code to check for the number of lines.

以下是不是我自己的代码，而是取自 这个答案.

mEditText.setOnKeyListener(new View.OnKeyListener() {

        @Override
        public boolean onKey(View v, int keyCode, KeyEvent event) {

            // if enter is pressed start calculating
            if (keyCode == KeyEvent.KEYCODE_ENTER
                    && event.getAction() == KeyEvent.ACTION_UP) {

                // get EditText text
                String text = ((EditText) v).getText().toString();

                // find how many rows it cointains
                editTextRowCount = text.split("\n").length;

                // user has input more than limited - lets do something
                // about that
                if (editTextRowCount >= 7) {

                    // find the last break
                    int lastBreakIndex = text.lastIndexOf("
");

                    // compose new text
                    String newText = text.substring(0, lastBreakIndex);

                    // add new text - delete old one and append new one
                    // (append because I want the cursor to be at the end)
                    ((EditText) v).setText("");
                    ((EditText) v).append(newText);

                }
            }

            return false;
        }

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