[移动开发]Android Studio 输入密码显示密码

package com.example.android0908;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.Toast;

import javax.microedition.khronos.egl.EGLDisplay;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.llinearlayout92902);
        initWidget();

    }
    private void initWidget()
    {
        Toast toast;
        toast = Toast.makeText(this,"helloworld",Toast.LENGTH_LONG);
        toast.show();

        ImageButton but;
        but=(ImageButton) findViewById(R.id.but1);
        but.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                EditText et1;
                et1 = (EditText)findViewById(R.id.et1);
                String mima = et1.getText().toString();

                EditText et2;
                et2 = (EditText)findViewById(R.id.et2);
                et2.setText(mima);

            }
        });

    }
}

<?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:orientation="vertical"
    android:background="#00B7FF">
<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">
    <EditText
        android:id="@+id/et1"
        android:layout_width="256dp"
        android:layout_height="wrap_content"
        android:hint="请输入密码:"
        android:password="true" />
</LinearLayout>
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
    <EditText
        android:id="@+id/et2"
        android:layout_width="258dp"
        android:layout_height="wrap_content"
        android:hint="您输入的密码为" />

        <ImageButton
            android:id="@+id/but1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#26FF00"
            android:src="@drawable/eyes"
            android:textSize="10dp" />
    </LinearLayout>
</LinearLayout>

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