修改Android 的EditText的密码视觉回显

Change EditText password mask character to asterisk (*)

如果EditText的inputType的类型如果为textPassword，那么输入键盘输入字符时，视觉效果是会把最后输入的字符明文显示出来的。

如果录屏或者截屏，那么则会把密码记录下来，带来安全隐患。

解决方案

<EditText    android:id="@+id/passWordEditText"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:gravity="center"    android:inputType="textPassword"    android:password="true"/>

EditText edittext = (EditText)findViewById(R.id.passWordEditText);edittext.setTransformationMethod(new AsteriskPasswordTransformationMethod());

public class AsteriskPasswordTransformationMethod 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        }    }};