如何在 android 中增加 inputType 密码点的大小

Question

我有一个 EditText，其 inputType 是 numberPassword。我想更改替换文本的点大小。就我的目的而言，它很小（android 默认值）。我想增加点的大小。我怎样才能做到这一点？

Answer 1

尝试用这个 ascii 码替换星号。
⚫ - ⚫ - 中号黑圈 ⬤ - ⬤ - 黑色大圆圈

What would be the Unicode character for big bullet in the middle of the character?

 public class MyPasswordTransformationMethod extends PasswordTransformationMethod {
    @Override
    public CharSequence getTransformation(CharSequence source, View view) {
        return new PasswordCharSequence(source);
    }

    private class PasswordCharSequence implements CharSequence {
        private CharSequence mSource;
        public PasswordCharSequence(CharSequence source) {
            mSource = source; // Store char sequence
        }
        public char charAt(int index) {
            return '*'; // This is the important part
        }
        public int length() {
            return mSource.length(); // Return default
        }
        public CharSequence subSequence(int start, int end) {
            return mSource.subSequence(start, end); // Return default
        }
    }
}; 

text.setTransformationMethod(new MyPasswordTransformationMethod());

Answer 2

提供的解决方案只奏效了一半，问题是转换会将文本直接转换为“*”，而预期的行为是在输入新字符后或几秒钟后隐藏字符，因此用户有机会在隐藏之前看到真正的字符。如果你想保持默认行为，你应该这样做：

/**
 * A transformation to increase the size of the dots displayed in the text.
 */
private object BiggerDotPasswordTransformationMethod : PasswordTransformationMethod() {

    override fun getTransformation(source: CharSequence, view: View): CharSequence {
        return PasswordCharSequence(super.getTransformation(source, view))
    }

    private class PasswordCharSequence(
        val transformation: CharSequence
    ) : CharSequence by transformation {
        override fun get(index: Int): Char = if (transformation[index] == DOT) {
            BIGGER_DOT
        } else {
            transformation[index]
        }
    }

    private const val DOT = '\u2022'
    private const val BIGGER_DOT = '●'
}

这会将原始点替换为您想要的任何字符。

Answer 3

试试这个

<com.google.android.material.textfield.TextInputLayout
            android:id="@+id/etPasswordLayout"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            app:passwordToggleEnabled="true">

            <com.google.android.material.textfield.TextInputEditText
                android:layout_width="match_parent"
                android:layout_height="60dp"
                android:text="password"
                android:padding="0dp"
                android:textSize="40dp"
                android:background="@color/white"
                android:inputType="textPassword" />

        </com.google.android.material.textfield.TextInputLayout>

Answer 4

kotlin 中要简单得多。您不需要创建单独的 class 来覆盖单个方法。在科特林中，你可以这样做：

val passwordTransformation =  object: PasswordTransformationMethod() {
                    override fun getTransformation(
                        source: CharSequence?,
                        view: View?
                    ): CharSequence {
                        return super.getTransformation(source, view).replace(Regex("\u2022"), "●")
                    }
                }

这样使用：

textView?.transformationMethod = passwordTransformation

如何在 android 中增加 inputType 密码点的大小

How to increase inputType password dot size in android

android

android-edittext

android-inputtype