android密码框右侧显示小眼睛

不知道为什么android 资料好少啊,一艘都2012-2015年的居多....这是为什么呢?

实现效果

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ffffff"
    android:orientation="vertical" >




    <LinearLayout

        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:padding="12dp" >

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <EditText
                android:paddingTop="10dp"
                android:background="@drawable/selector_sign"
                android:id="@+id/et_usertel"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_centerInParent="true"
                android:hint="@string/editText_phont"
                android:inputType="phone"
                android:paddingLeft="90dp"
                android:singleLine="true"
                android:textColorHint="#DDDDDD"
                android:textSize="16sp" />

            <EditText
                android:id="@+id/edt_chosed_country_num"
                android:layout_width="60dp"
                android:layout_height="wrap_content"
                android:layout_alignLeft="@id/et_usertel"
                android:layout_centerVertical="true"
                android:layout_marginLeft="10dp"
                android:background="@color/white"
                android:inputType="number"
                android:maxLength="5"
                android:text="+86"
                android:textColor="#353535"
                android:textSize="16sp" />
        </RelativeLayout>

        <LinearLayout
            android:id="@+id/linear_password_code"
            android:visibility="visible"
            android:layout_marginTop="10dp"
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content" >

                <EditText
                    android:background="@drawable/selector_sign"
                    android:id="@+id/et_password"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_centerInParent="true"
                    android:paddingTop="10dp"
                    android:hint="@string/editText_code"
                    android:paddingLeft="90dp"
                    android:singleLine="true"
                    android:textColorHint="#DDDDDD"
                    android:textSize="16sp" />

                <Button
                    android:id="@+id/bu_register_code"
                    android:layout_width="wrap_content"
                    android:layout_height="40dp"
                    android:layout_alignRight="@+id/et_password"
                    android:layout_marginRight="2dp"
                    android:background="@drawable/shape_border_color_primary_sign"
                    android:text="@string/verification_code"
                    android:textColor="@drawable/selector_text_color_primary"
                    android:textSize="16sp" />
                <!--  <View
                      android:layout_marginTop="1dp"
                      android:layout_alignBottom="@+id/bu_code"
                      android:layout_width="290dp"
                      android:layout_height="1dp"
                      android:background="@color/light_grey"/>-->

            </RelativeLayout>


        </LinearLayout>

        <LinearLayout
            android:id="@+id/password_liner"
            android:visibility="gone"
            android:layout_marginTop="10dp"
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content" >

                <EditText
                    android:background="@drawable/selector_sign"
                    android:id="@+id/et_password_code"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_centerInParent="true"
                    android:paddingTop="10dp"
                    android:hint="请输入密码登录"
                    android:paddingLeft="90dp"
                    android:singleLine="true"
                    android:textColorHint="#DDDDDD"
                    android:inputType="textPassword"
                    android:textSize="16sp" />

                <ImageView
                    android:id="@+id/imageView"
                    android:layout_width="20dp"
                    android:layout_height="20dp"
                    android:layout_alignParentRight="true"
                    android:layout_margin="10dp" />
            </RelativeLayout>


        </LinearLayout>


        <Button
            android:textColor="@color/background"
            android:layout_marginTop="10dp"
            android:background="@drawable/shape_color_primary"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="登录"/>


        <LinearLayout
            android:layout_marginTop="2dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <TextView
                android:textStyle="bold"
                android:gravity="center"
                android:text="使用密码登录 >"
                android:id="@+id/tv_register_login_password"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />
        </LinearLayout>

    </LinearLayout>


</LinearLayout>

//主要代码如下 

  <LinearLayout
            android:id="@+id/password_liner"
            android:visibility="gone"
            android:layout_marginTop="10dp"
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content" >

                <EditText
                    android:background="@drawable/selector_sign"
                    android:id="@+id/et_password_code"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_centerInParent="true"
                    android:paddingTop="10dp"
                    android:hint="请输入密码登录"
                    android:paddingLeft="90dp"
                    android:singleLine="true"
                    android:textColorHint="#DDDDDD"
                    android:inputType="textPassword"
                    android:textSize="16sp" />

                <ImageView
                    android:id="@+id/imageView"
                    android:layout_width="20dp"
                    android:layout_height="20dp"
                    android:layout_alignParentRight="true"
                    android:layout_margin="10dp" />
            </RelativeLayout>


        </LinearLayout>

重要代码 

    private boolean isHideFirst = true;// 输入框密码是否是隐藏的，默认为true



   if (isHideFirst == true) {
                        imageView.setImageResource(R.drawable.open);
                        //密文
                        HideReturnsTransformationMethod method1 = HideReturnsTransformationMethod.getInstance();
                        et_password_code.setTransformationMethod(method1);
                        isHideFirst = false;
                    } else {
                        imageView.setImageResource(R.drawable.close);
                        //密文
                        TransformationMethod method = PasswordTransformationMethod.getInstance();
                        et_password_code.setTransformationMethod(method);
                        isHideFirst = true;

                    }
                    // 光标的位置  
                    int index = et_password_code.getText().toString().length();
                    et_password_code.setSelection(index);

// 

package com.ynrd.entrepreneur.activity;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.text.method.HideReturnsTransformationMethod;
import android.text.method.PasswordTransformationMethod;
import android.text.method.TransformationMethod;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

import com.ynrd.entrepreneur.R;
import com.ynrd.entrepreneur.utils.CountDownTimerUtils;

public class RegisterActivity extends BaseCommonActivity implements View.OnClickListener {

    private Button bu_register_code;
    private TextView tv_register_login_password;
    private boolean isHideFirst = true;// 输入框密码是否是隐藏的，默认为true
    private boolean isFirst = true;// 是否密码登录,默认是验证码登录

    private ImageView imageView;
    private EditText et_password_code;
    private LinearLayout linear_password_code,password_liner;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register);
    }

    @Override
    protected void initViews() {
        super.initViews();
        //获取验证码
        bu_register_code = findViewById(R.id.bu_register_code);
        tv_register_login_password = findViewById(R.id.tv_register_login_password);
        imageView =  findViewById(R.id.imageView);
        et_password_code = findViewById(R.id.et_password_code);
        linear_password_code = findViewById(R.id.linear_password_code);
        password_liner = findViewById(R.id.password_liner);
    }

    @Override
    protected void initListeners() {
        super.initListeners();
        bu_register_code.setOnClickListener(this);
        tv_register_login_password.setOnClickListener(this);
        imageView.setOnClickListener(this);
        imageView.setImageResource(R.drawable.close);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.bu_register_code:
                //验证码方法 后期调用服务器
                CountDownTimerUtils mCountDownTimerUtils = new CountDownTimerUtils(bu_register_code, 30000, 1000);
                mCountDownTimerUtils.start();
                break;
            case R.id.tv_register_login_password:
                if (isFirst == true){
                    //切换成密码登录
                    linear_password_code.setVisibility(View.GONE);
                    password_liner.setVisibility(View.VISIBLE);
                    tv_register_login_password.setText("使用短信验证码登录 >");
                    isFirst = false;
                }else{
                    //切换成验证码登录
                    linear_password_code.setVisibility(View.VISIBLE);
                    password_liner.setVisibility(View.GONE);
                    tv_register_login_password.setText("使用密码登录 >");
                    isFirst = true;
                }
                break;
            case R.id.imageView:
                    if (isHideFirst == true) {
                        imageView.setImageResource(R.drawable.open);
                        //密文
                        HideReturnsTransformationMethod method1 = HideReturnsTransformationMethod.getInstance();
                        et_password_code.setTransformationMethod(method1);
                        isHideFirst = false;
                    } else {
                        imageView.setImageResource(R.drawable.close);
                        //密文
                        TransformationMethod method = PasswordTransformationMethod.getInstance();
                        et_password_code.setTransformationMethod(method);
                        isHideFirst = true;

                    }
                    // 光标的位置  
                    int index = et_password_code.getText().toString().length();
                    et_password_code.setSelection(index);
                break;
        }
    }
}

本文地址：https://blog.csdn.net/qq_29072049/article/details/108829453