在您的xml文件中插入edittext,
<EditText
android:id="@+id/passWordEditText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:inputType="textPassword"/>
然后你的类文件继续从edittext获取findViewById并为此实现,
EditText edittext = (EditText)findViewById(R.id.passWordEditText);
edittext.setTransformationMethod(new AsteriskPasswordTransformationMethod());
并且这个类为此实现,
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
}
}
};
如果您的代码是 Kotlin,那么您必须制作单独的 java 文件,然后您必须将 java 与 kotlin 代码一起使用。