根据这个来源，如果你已经将你的项目迁移到AndroidX，那么你可以替换

编译”com.android.support:设计:24.2.0”

与

实现“com.google.android.material:材料:1.0.0”

然后你所要做的就是把下面的代码放到你的布局文件中:

<com.google.android.material.textfield.TextInputLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:passwordToggleEnabled="true"
    android:hint="@string/hint_text">

  <com.google.android.material.textfield.TextInputEditText
      android:layout_width="match_parent"
      android:layout_height="wrap_content"/>

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

关于材质TextInputLayout的更多信息可以在这里找到。

对于这个源码，建议从Android支持库迁移到AndroidX:

AndroidX is the open-source project that the Android team uses to develop, test, package, version and release libraries within Jetpack. AndroidX is a major improvement to the original Android Support Library. Like the Support Library, AndroidX ships separately from the Android OS and provides backwards-compatibility across Android releases. AndroidX fully replaces the Support Library by providing feature parity and new libraries. In addition AndroidX includes the following features: All packages in AndroidX live in a consistent namespace starting with the string androidx. The Support Library packages have been mapped into corresponding androidx.* packages. For a full mapping of all the old classes and build artifacts to the new ones, see the Package Refactoring page. Unlike the Support Library, AndroidX packages are separately maintained and updated. The androidx packages use strict Semantic Versioning starting with version 1.0.0. You can update AndroidX libraries in your project independently. All new Support Library development will occur in the AndroidX library. This includes maintenance of the original Support Library artifacts and introduction of new Jetpack components.

private boolean isPasswordVisible;

private TextInputEditText firstEditText;

...

firstEditText = findViewById(R.id.et_first);

...

    private void togglePassVisability() {
    if (isPasswordVisible) {
        String pass = firstEditText.getText().toString();
        firstEditText.setTransformationMethod(PasswordTransformationMethod.getInstance());
        firstEditText.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);
        firstEditText.setText(pass);
        firstEditText.setSelection(pass.length());           
    } else {
        String pass = firstEditText.getText().toString();
        firstEditText.setTransformationMethod(HideReturnsTransformationMethod.getInstance());
        firstEditText.setInputType(InputType.TYPE_CLASS_TEXT);
        firstEditText.setText(pass);
        firstEditText.setSelection(pass.length());
    }
    isPasswordVisible= !isPasswordVisible;
}

首先，这是屏幕加载图像矢量资产可见性

点击它将改变这个图像的可见性关闭

以上密码开关代码(xml代码)

<androidx.constraintlayout.widget.ConstraintLayout
    android:id="@+id/laypass"
    android:layout_width="330dp"
    android:layout_height="50dp"
    android:layout_marginTop="24dp"
    app:layout_constraintEnd_toEndOf="@+id/editText3"
    app:layout_constraintStart_toStartOf="@+id/editText3"
    app:layout_constraintTop_toBottomOf="@+id/editText3">

    <EditText
        android:id="@+id/edit_password"
        style="@style/EditTextTheme"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/round"
        android:drawableLeft="@drawable/ic_password"
        android:drawablePadding="10dp"
        android:ems="10"
        android:hint="Password"
        android:inputType="textPassword"
        android:paddingLeft="10dp"
        android:paddingRight="15dp"
        android:textColor="@color/cyan92a6"
        android:textColorHint="@color/cyan92a6"
        android:textCursorDrawable="@null"
        android:textSize="18sp"
        />

    <ImageView
        android:id="@+id/show_pass_btn"
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:layout_marginEnd="8dp"
        android:alpha=".5"
        android:onClick="ShowHidePass"
        android:padding="5dp"
        android:src="@drawable/ic_visibility"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="@+id/laypass"
        app:layout_constraintTop_toTopOf="@+id/edit_password" /> 
 </androidx.constraintlayout.widget.ConstraintLayout>

按钮操作的Java代码

public void ShowHidePass(View view) {

    if(view.getId()==R.id.show_pass_btn){
        if(edit_password.getTransformationMethod().equals(PasswordTransformationMethod.getInstance())){
            ((ImageView)(view)).setImageResource(R.drawable.ic_visibility_off);
            //Show Password
            edit_password.setTransformationMethod(HideReturnsTransformationMethod.getInstance());
        }
        else{
            ((ImageView)(view)).setImageResource(R.drawable.ic_visibility);
            //Hide Password
            edit_password.setTransformationMethod(PasswordTransformationMethod.getInstance());
        }
    }
}

我所做的是

创建一个编辑文本视图和一个普通文本视图 通过使用约束布局使它们相互重叠(就像Facebook应用登录屏幕一样) 将onClickListener附加到普通文本视图，以便它相应地改变编辑文本视图的输入类型(可见/不可见)

你可以看看这个视频，了解更详细的步骤和解释https://youtu.be/md3eVaRzdIM

希望能有所帮助。

只需在Xml文件中创建一个复选框

然后简单的用Java代码编写这个函数

checkbox = findViewById(R.id.checkbox);
        checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked){

                if (isChecked) {
                    password.setTransformationMethod(null);
                }
                else{
                    password.setTransformationMethod(new PasswordTransformationMethod());
                }
            }

        });

似乎input_layout。isPasswordVisibilityToggleEnabled = true已弃用。在我的例子中，我在Kotlin中这样做:

input_edit_text.inputType = TYPE_CLASS_TEXT or TYPE_TEXT_VARIATION_PASSWORD
input_layout.endIconMode = END_ICON_PASSWORD_TOGGLE

其中input_edit_text是com.google.android.material.textfield.TextInputEditText, input_layout是com.google.android.material.textfield.TextInputLayout。当然，你应该导入这些asl:

import android.text.InputType.TYPE_CLASS_TEXT
import android.text.InputType.TYPE_TEXT_VARIATION_PASSWORD
import com.google.android.material.textfield.TextInputLayout.END_ICON_PASSWORD_TOGGLE

My可以自定义图标提供的方法如下:

 input_layout.endIconDrawable = ...
 input_layout.setEndIconOnClickListener {  }
 input_layout.setEndIconOnLongClickListener(...)