移动应用程序设计基础——用户登录实验

短命女 2023-10-01 13:13 32阅读 0赞

## **《移动应用程序设计基础》实 验 报 告（二）** ##

### **实验名称：** ###

用户登录实验

### **所使用的工具软件及环境：** ###

JDK1.8，Android Studio

### **一、实验目的：** ###

本实验通过实现用户登录界面，使得学员能进一步加深和掌握Android的常用基本控件使用，包括：TextView，EditView、CheckBox、Button、ImageView以及ProgressBar等。

### **二、实验内容：** ###

1.  构建登录界面布局login.xml，放置各类按钮，如下图；
2.  ![915d10a862a9416e96675f439b4b71b0.png][]
3.  编写Activity代码LoginActivity.java,实现EditView的username、password和CheckBox的issaved控件发现取得；
4.  编写进度条ProgressBar的界面布局progress.xml,放置水平进度条，设置最大值属性为100；
5.  编写ProgressActivity.java代码，通过线程和Handler模拟实现ProgressBar的进度条的进度值变动，每100毫秒增加1；
6.  点击Submit按钮，页面跳转到进度条界面，进度条启动，当进度值达到最大（100）时，关闭进度条，并将用户名（username）信息返回登录页面，通过Toast弹出信息框提示登录成功或失败原因。
7.  提示：页面跳转可以使用startActivityForResult方法，返回结果可以覆写onActivityResult方法，设置返回值可以使用setResult方法。
8.  实验结果
9.  ![dc3c08fb093348e697822eabe79f0773.png][]![8c5919adfed84b27a0927c3c53fcf3f8.png][]

### **三、源代码** ###

//activity_main.xml
    
    <?xml version="1.0" encoding="utf-8"?>
    <androidx.constraintlayout.widget.ConstraintLayout 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=".MainActivity"><![CDATA[
    
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            tools:layout_editor_absoluteX="162dp"
            tools:layout_editor_absoluteY="80dp">
        ]]>
    
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">
    
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="72dp"
                android:orientation="horizontal"></LinearLayout>
    
            <LinearLayout
                android:id="@+id/linearLayout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical">
    
                <LinearLayout
                    android:layout_width="323dp"
                    android:layout_height="153dp"
                    android:orientation="horizontal">
    
                    <LinearLayout
                        android:layout_width="85dp"
                        android:layout_height="match_parent"
                        android:orientation="vertical"></LinearLayout>
    
                    <ImageView
                        android:id="@+id/imageView"
                        android:layout_width="wrap_content"
                        android:layout_height="149dp"
                        app:srcCompat="@drawable/logo"
                        tools:ignore="MissingConstraints" />
                </LinearLayout>
    
                <FrameLayout
                    android:layout_width="375dp"
                    android:layout_height="75dp">
    
                </FrameLayout>
    
                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="102dp"
                    android:orientation="horizontal">
    
                    <FrameLayout
                        android:layout_width="101dp"
                        android:layout_height="match_parent">
    
                    </FrameLayout>
    
                    <TextView
                        android:id="@+id/textView2"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="SYSTEM LOGIN"
                        android:textSize="30sp"
                        tools:ignore="MissingConstraints" />
                </LinearLayout>
    
            </LinearLayout>
    
            <LinearLayout
                android:layout_width="407dp"
                android:layout_height="138dp"
                android:orientation="vertical"
                tools:ignore="MissingConstraints">
    
                <LinearLayout
                    android:layout_width="381dp"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal">
    
                    <LinearLayout
                        android:layout_width="45dp"
                        android:layout_height="match_parent"
                        android:orientation="horizontal"></LinearLayout>
    
                    <TextView
                        android:id="@+id/textView3"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="Username:"
                        android:textSize="20dp"
                        tools:ignore="MissingConstraints"
                        tools:layout_editor_absoluteX="16dp"
                        tools:layout_editor_absoluteY="481dp" />
    
                    <EditText
                        android:id="@+id/usename_edtxt"
                        android:layout_width="244dp"
                        android:layout_height="wrap_content"
                        android:drawablePadding="12dp"
                        android:gravity="center|left"
                        android:hint="请输入用户名"
                        android:textColorHint="@android:color/darker_gray"
                        android:textSize="24sp"
                        tools:ignore="MissingConstraints" />
                </LinearLayout>
    
                <LinearLayout
                    android:layout_width="382dp"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal">
    
                    <LinearLayout
                        android:layout_width="45dp"
                        android:layout_height="match_parent"
                        android:orientation="horizontal"></LinearLayout>
    
                    <TextView
                        android:id="@+id/textView4"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="Password:"
                        android:textSize="20dp"
                        tools:ignore="MissingConstraints"
                        tools:layout_editor_absoluteX="16dp"
                        tools:layout_editor_absoluteY="538dp" />
    
                    <EditText
                        android:id="@+id/password_edtxt"
                        android:layout_width="272dp"
                        android:layout_height="55dp"
                        android:drawablePadding="12dp"
                        android:gravity="center|left"
                        android:hint="请输入密码"
                        android:inputType="textPassword"
                        android:textColorHint="@android:color/darker_gray"
                        android:textSize="24sp"
                        tools:ignore="MissingConstraints"
                        tools:layout_editor_absoluteX="117dp"
                        tools:layout_editor_absoluteY="523dp" />
    
                </LinearLayout>
    
                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:orientation="horizontal">
    
                    <LinearLayout
                        android:layout_width="262dp"
                        android:layout_height="match_parent"
                        android:orientation="horizontal">
    
                    </LinearLayout>
    
                    <CheckBox
                        android:id="@+id/save_password_checkBox"
                        android:layout_width="346dp"
                        android:layout_height="match_parent"
                        android:text="Save Password" />
    
                </LinearLayout>
    
            </LinearLayout>
    
            <LinearLayout
                android:layout_width="387dp"
                android:layout_height="wrap_content"
                android:orientation="vertical">
    
                <LinearLayout
                    android:layout_width="183dp"
                    android:layout_height="15dp"
                    android:orientation="horizontal">
    
                </LinearLayout>
    
                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:orientation="horizontal">
    
                    <LinearLayout
                        android:layout_width="39dp"
                        android:layout_height="70dp"
                        android:orientation="vertical">
    
                    </LinearLayout>
    
                    <Button
                        android:id="@+id/submit_button"
                        android:layout_width="335dp"
                        android:layout_height="wrap_content"
                        android:backgroundTint="@color/black"
                        android:text="submit" />
                </LinearLayout>
    
            </LinearLayout>
    
        </LinearLayout>
    
    
    </androidx.constraintlayout.widget.ConstraintLayout>

//MainActivity.java 
    
    package com.example.login;
    
    import androidx.appcompat.app.AppCompatActivity;
    
    import android.content.Context;
    import android.content.Intent;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.Button;
    import android.widget.CheckBox;
    import android.widget.EditText;
    
    public class MainActivity extends AppCompatActivity {
    
        static public EditText usenameEdtxt,passwordEdtxt;
        static public CheckBox savePasswordCheckBox;
        public Button submitButton;
        public Boolean Selectcheckbox;
        static public String select;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            usenameEdtxt=(EditText)findViewById(R.id.usename_edtxt);
            passwordEdtxt=(EditText)findViewById(R.id.password_edtxt);
            savePasswordCheckBox=(CheckBox)findViewById(R.id.save_password_checkBox);
            submitButton=(Button)findViewById(R.id.submit_button);
            //登录按钮监控
            submitButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    String usename=usenameEdtxt.getText().toString();
                    String password=passwordEdtxt.getText().toString();
    
                    if(usename.isEmpty()){
                        usenameEdtxt.setError("用户名不能为空");
                        usenameEdtxt.requestFocus();
                        return;
                    }
                    if(password.isEmpty()){
                        passwordEdtxt.setError("密码不能为空");
                        passwordEdtxt.requestFocus();
                        return;
                    }
                    if(usename.length()>0&&password.length()>0){
    
                        Selectcheckbox=savePasswordCheckBox.isChecked();
                        if(Selectcheckbox)select="已勾选";
                        else select="未勾选";
    
                        Intent it=new Intent();
                        Context packageContext;
                        it.setClass(MainActivity.this, ProgressActivity.class);
                        MainActivity.this.startActivity(it);
    
                    }
    
                }
    
            });
    
    
        }
    }

// progress.xml
    
    
    
    <?xml version="1.0" encoding="utf-8"?>
        <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
            xmlns:tools="http://schemas.android.com/tools"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            tools:context=".ProgressActivity">
    
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="76dp"
            android:orientation="vertical">
    
        </LinearLayout>
    
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="169dp"
            android:orientation="horizontal">
    
            <LinearLayout
                android:layout_width="45dp"
                android:layout_height="match_parent"
                android:orientation="vertical">
    
            </LinearLayout>
    
            <ProgressBar
                android:id="@+id/horizontal_pbar"
                style="?android:attr/progressBarStyleHorizontal"
                android:layout_width="322dp"
                android:layout_height="97dp"
                android:max="100" />
        </LinearLayout>
    
    
    
    </LinearLayout>

// ProgressActivity.java
    
    package com.example.login;
    
    
    import android.os.Bundle;
    import android.os.Handler;
    import android.view.Gravity;
    import android.view.View;
    import android.widget.Button;
    import android.widget.ProgressBar;
    import android.widget.Toast;
    
    import androidx.appcompat.app.AppCompatActivity;
    
    public class ProgressActivity extends AppCompatActivity {
    
    
        //MainActivity mainActivity=new MainActivity();
    
        private ProgressBar mProgress;
        private Handler mHandler = new Handler();
        public String a="admin";
        private Boolean FLAG=true;
        private Button startpbarbtn;
        //private TextView cBoxStateTxt;
        int mProgressStatus=0;
        protected void onCreate(Bundle icicle) {
            super.onCreate(icicle);
            setContentView(R.layout.progress);
    
    
            mProgress = (ProgressBar) findViewById(R.id.horizontal_pbar);
            //设置监听按钮
            //startpbarbtn = (Button)findViewById(R.id.start_pbar_btn);
            //设置监视内容
                    //监听
            new Thread(new Runnable() {
                public void run() {
                    //推荐使用标志位使其不执行代码，不推荐使用true
                    while (FLAG) {
                        mProgressStatus = addNum();
                        // 更新进度条
                        // post方法推送一个Runnable到Handler，可以在此更新UI
                        mHandler.post(new Runnable() {
                            public void run() {
                                if (mProgressStatus < 100) {
                                    mProgress.setProgress(mProgressStatus);
                                    mProgressStatus++;
                                }
                                //执行完成后隐藏进度条并将标志设置为false
                                else {
                                    mProgress.setVisibility(View.INVISIBLE);
                                    FLAG = false;
    
                                    if(MainActivity.usenameEdtxt.getText().toString().equals(a)&&
                                            MainActivity.passwordEdtxt.getText().toString().equals(a)) {
                                        Toast toast = Toast.makeText(getApplicationContext(),
                                                "登录成功Usename："+MainActivity.usenameEdtxt.getText().toString()+
                                                        "\nPassword："+MainActivity.passwordEdtxt.getText().toString()+
                                                "\ncheckbox状态："+MainActivity.select,
    
                                                Toast.LENGTH_LONG);
                                        toast.setGravity(Gravity.CENTER, 0, 0);
                                        toast.show();
    
                                    }
                                    else{
                                        Toast toast = Toast.makeText(getApplicationContext(),
                                                "登录失败Usename："+MainActivity.usenameEdtxt.getText().toString()+
                                                        "\nPassword："+MainActivity.passwordEdtxt.getText().toString()+
                                                "\ncheckbox状态："+MainActivity.select,
                                                Toast.LENGTH_LONG);
                                        toast.setGravity(Gravity.CENTER, 0, 0);
                                        toast.show();
    
                                    }
    
                                    finish();
                                }
    
                            }
    
                        });
                    }
    
                }
    
                private int addNum() {
    
                    try {
                        Thread.sleep(100);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    return mProgressStatus;
                }
    
            }).start();
    
    
    
            //cBoxStateTxt.setText("CheckBox状态:    "+mainActivity.select);
    
        }
    }

### **四、实验结果测试** ###

![1cd6dab6982643fda3d0a8efb2252ec0.png][]

![a0a8678333b44cde8185f6f88e60c890.png][]

![12ebf63b75bd4b9c860ffaad65e863fa.png][]

![9e346d38648a4c1a9addaed9099d2a77.png][]

![7992ce3ab65c49149ffb14a509065a75.png][]

**此时输入设置好的username和password，勾选或不勾选save password，点击submit按钮会跳转到进度条界面，进度条满后会返回界面，出现登录成功还有输入的username和password且save password的勾选状态的小提示。同时如果输入错误的username和password会出现登录错误还有其他部分的小提示。**

### 五、**收获与体会** ###

通过此次实验，使得更能进一步加深和掌握Android的常用基本控件使用，对基本控件有了基本的认识，而且对以前的知识有了进一步的复习与巩固，对今后android的app制作有了较大的进步与学习。

[915d10a862a9416e96675f439b4b71b0.png]: https://img-blog.csdnimg.cn/915d10a862a9416e96675f439b4b71b0.png
[dc3c08fb093348e697822eabe79f0773.png]: https://img-blog.csdnimg.cn/dc3c08fb093348e697822eabe79f0773.png
[8c5919adfed84b27a0927c3c53fcf3f8.png]: https://img-blog.csdnimg.cn/8c5919adfed84b27a0927c3c53fcf3f8.png
[1cd6dab6982643fda3d0a8efb2252ec0.png]: https://img-blog.csdnimg.cn/1cd6dab6982643fda3d0a8efb2252ec0.png
[a0a8678333b44cde8185f6f88e60c890.png]: https://img-blog.csdnimg.cn/a0a8678333b44cde8185f6f88e60c890.png
[12ebf63b75bd4b9c860ffaad65e863fa.png]: https://img-blog.csdnimg.cn/12ebf63b75bd4b9c860ffaad65e863fa.png
[9e346d38648a4c1a9addaed9099d2a77.png]: https://img-blog.csdnimg.cn/9e346d38648a4c1a9addaed9099d2a77.png
[7992ce3ab65c49149ffb14a509065a75.png]: https://img-blog.csdnimg.cn/7992ce3ab65c49149ffb14a509065a75.png