在android中使用可绘制的图标显示和隐藏密码

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <EditText
        android:id="@+id/passwordEditText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="textPassword" />

    <ImageView
        android:id="@+id/showHidePasswordImageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@id/passwordEditText"
        android:layout_alignEnd="@id/passwordEditText"
        android:padding="8dp"
        android:src="@drawable/ic_password_hide" />

</RelativeLayout>

EditText passwordEditText = findViewById(R.id.passwordEditText);
ImageView showHidePasswordImageView = findViewById(R.id.showHidePasswordImageView);

showHidePasswordImageView.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        if (passwordEditText.getInputType() == InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD) {
            passwordEditText.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);
            showHidePasswordImageView.setImageResource(R.drawable.ic_password_hide);
        } else {
            passwordEditText.setInputType(InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);
            showHidePasswordImageView.setImageResource(R.drawable.ic_password_show);
        }
        passwordEditText.setSelection(passwordEditText.getText().length()); // 保持光标在末尾
    }
});

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/ic_password_hide_enabled" android:state_enabled="true" />
    <item android:drawable="@drawable/ic_password_hide_disabled" android:state_enabled="false" />
</selector>

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/ic_password_show_enabled" android:state_enabled="true" />
    <item android:drawable="@drawable/ic_password_show_disabled" android:state_enabled="false" />
</selector>