我如何在 UI 中显示字符限制以及为用户数字化了多少？ Android Java

Question

我该怎么做？我的意思是显示字符限制以及输入文本中有多少数字。

Answer 1

您可以使用 TextInputLayout 来实现：

app:counterEnabled="true"
app:counterMaxLength="250"

例子

<android.support.design.widget.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:counterEnabled="true"
app:counterMaxLength="250">

   <EditText
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:maxLength="250" />

</android.support.design.widget.TextInputLayout>

Answer 2

实现它看起来像这样：

private TextView mTextView;
private EditText mEditText;
private final TextWatcher mTextEditorWatcher = new TextWatcher() {
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }

        public void onTextChanged(CharSequence s, int start, int before, int count) {
           //This sets a textview to the current length
           mTextView.setText(String.valueOf(s.length()));
        }

        public void afterTextChanged(Editable s) {
        }
};

然后您必须将编辑文本设置为侦听器：

mEditText.addTextChangedListener(mTextEditorWatcher);

然后在布局中将您的编辑文本包裹在以下 TextInputLayout 中：

<android.support.design.widget.TextInputLayout
    android:id="@+id/textContainer"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:counterEnabled="true"
    app:counterMaxLength="20"
    >
    <EditText
        android:id="@+id/text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Text Hint"
        />
</android.support.design.widget.TextInputLayout>

祝你好运:)

Answer 3

您只需在 xml、

中使用 TextInputLayout 小部件即可完成此任务

<android.support.design.widget.TextInputLayout 
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:counterEnabled="true"
    app:counterMaxLength="50">

       <EditText
           android:layout_width="match_parent"
           android:layout_height="wrap_content"
           android:maxLength="50" />

</android.support.design.widget.TextInputLayout>

这里counterEnabled是开启计数器，counterMaxLength设置计数器的最大量程

虽然 maxLength 在 EditText 中设置了最大字符数，但可以在您的 EditText 中输入。

Answer 4

你可以TextInputLayout which is support character counting functionality. Here, I have mentioned full description on how to implement TextInputLayout with TextInputEditText

字符计数器

Character Counter is a feature used by quite a few applications. (Remember Twitter character limit?). Set app:counterEnabled to true and app:counterMaxLength with the maximum number of characters you want in the TextInputLayout. Character Counter is by default displayed below the EditText (bottom-right) and while writing this tutorial, there’s no way to change the position, yet. Styling the counter is similar to styling the hint text. app:counterTextAppearance is the attribute used this time. We’ve added the following style inside the styles.xml file in our project.

<style name="CounterText" parent="TextAppearance.Design.Counter">
        <item name="android:textSize">16sp</item>
        <item name="android:textColor">@color/my_pink</item>
    </style>

下面的 xml 代码来自 activity_main.xml 布局，并且具有带有默认字符计数器和自定义字符计数器的 EditText 字段。

 <android.support.design.widget.TextInputLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="@dimen/activity_horizontal_margin"
            app:counterEnabled="true"
            app:counterMaxLength="5"
            app:hintTextAppearance="@style/HintText">

            <android.support.design.widget.TextInputEditText
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="Character Counter Limit 10" />

        </android.support.design.widget.TextInputLayout>

上面代码的输出如下。

我如何在 UI 中显示字符限制以及为用户数字化了多少？ Android Java

How can I show in UI the limit of character and how much was digited for the user? Android Java

java

xml

android

charactercount

android-textwatcher