android实现登录注册界面

1. 创建一个androidstudio工程

• 在drawable中添加
  

main_left:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
        <stroke
            android:width="1dp"
            android:color="@color/orange">

        </stroke>
    <corners
        android:bottomLeftRadius="20dp"
        android:topLeftRadius="20dp">

    </corners>
</shape>

main_right:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
        <stroke
            android:width="1dp"
            android:color="@color/orange">

        </stroke>
    <corners
        android:bottomRightRadius="20dp"
        android:topRightRadius="20dp">

    </corners>
</shape>

• 在activity_main中完成基本布局代码
  
  ``

``

2. 完成登录后界面和注册时界面

• activity_login
  

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".LoginActivity"
    android:orientation="vertical"
    android:padding="10dp">

    <TextView
        android:id="@+id/tv_login_1"
        android:layout_width="match_parent"
        android:layout_height="80dp"
        android:text="登录后界面"
        android:gravity="center"
        android:textSize="30sp"
        android:background="#feeeee"
        android:layout_margin="20dp"/>

</LinearLayout>

• activity_register
  

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".RegisterActivity"
    android:orientation="vertical"
    android:padding="10dp">

    <TextView
        android:id="@+id/tv_register_1"
        android:layout_width="match_parent"
        android:layout_height="80dp"
        android:text="注册界面"
        android:gravity="center"
        android:textSize="30sp"
        android:background="#ff8ff3"
        android:layout_margin="20dp"/>
    <EditText
        android:id="@+id/et_register_1"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:hint="用户名"
        android:textSize="18sp"
        android:textColor="@color/black"
        android:layout_margin="20dp" />
    <EditText
        android:id="@+id/et_register_2"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:hint="设置密码"
        android:textSize="18sp"
        android:textColor="@color/black"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:inputType="textPassword"/>
    <EditText
        android:id="@+id/et_register_3"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:hint="确认密码"
        android:textSize="18sp"
        android:textColor="@color/black"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:inputType="textPassword"
        android:layout_marginTop="20dp"/>



        <Button
            android:id="@+id/btn_register_1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="提交"
            android:layout_marginTop="20dp"
            />



</LinearLayout>

3. 其次完成MainActivity和RegisterActivity的代码

• 先在网上下载两个小眼睛完成输入密码后点击后查看密码插入到res-mipmap

• MainActivity

```
package com.example.activity;

import androidx.appcompat.app.AppCompatActivity;

import android.annotation.SuppressLint;
import android.content.Intent;
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.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    //声明控件
    private Button mBtn_main_1;
    private Button mBtn_main_2;
    private EditText mEt_username1;
    private EditText mEt_password1;
    private Object vi;
    private boolean hide = true;
    private ImageView eye;

    @SuppressLint("MissingInflatedId")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        //找到控件
       mBtn_main_1 = findViewById(R.id.btn_main_1);
        mBtn_main_2 = findViewById(R.id.btn_main_2);
        mEt_username1 = findViewById(R.id.et_username1);
        mEt_password1 = findViewById(R.id.et_password1);
        eye = findViewById(R.id.eye);
        eye.setImageResource(R.mipmap.close);
        eye.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                    switch (view.getId()) {
                            case R.id.eye:
                                if (hide == true) {
                                    eye.setImageResource(R.mipmap.open);
                                    HideReturnsTransformationMethod method = HideReturnsTransformationMethod.getInstance();

                                    mEt_password1.setTransformationMethod(method);
                                    boolean b = hide == false;
                                } else {
                                    eye.setImageResource(R.mipmap.close);
                                    TransformationMethod method = PasswordTransformationMethod.getInstance();
                                    mEt_password1.setTransformationMethod(method);
                                    boolean b = hide == true;
                                }
                                int index = mEt_password1.getText().toString().length();
                                mEt_password1.setSelection(index);
                                break;
                        }
                    }
        });

        /*mBtn_main_1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MainActivity.this,LoginActivity.class);
                startActivity(intent);
            }
        });*/
        mBtn_main_1.setOnClickListener(this);
        mBtn_main_2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MainActivity.this,RegisterActivity.class);


                startActivity(intent);
            }
        });



    }


    public void onClick(View view) {
        //从RegisterActivity中带过来的用户名和密码
        Intent intent = getIntent();
        String name = intent.getStringExtra("username");
        String pass = intent.getStringExtra("password");
        //从本界面activity_main中获取输入的用户名和密码
        String username1 = mEt_username1.getText().toString();
        String password1 = mEt_password1.getText().toString();
        Intent intent1 = null;
        if (username1.equals(name) && password1.equals(pass)){
            intent1 = new Intent(MainActivity.this,LoginActivity.class);
            startActivity(intent1);
        }else {

        }
    }
}
```

• RegisterACtivity

package com.example.activity;

import androidx.appcompat.app.AppCompatActivity;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class RegisterActivity extends AppCompatActivity {
    private Button mBtn_register_1;



    @SuppressLint("MissingInflatedId")

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

        mBtn_register_1 = findViewById(R.id.btn_register_1);
        mBtn_register_1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(RegisterActivity.this, MainActivity.class);
                //利用方法生成用户名和密码
                intent.putExtra("username","abc");
                intent.putExtra("password","12");
                startActivity(intent);
            }
        });
    }
}