Android编程技术基础第三次大作业

package vip.wfb.bigwork3;




import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.view.Window;
import android.view.WindowManager;


public class MainActivity extends Activity {


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//去除activity上边的框框
requestWindowFeature(Window.FEATURE_NO_TITLE);
//设置全屏显示
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);




new Handler().postDelayed(new Runnable() {
@Override
public void run() {
//第一个参数，当前上下文。第二个参数，计时结束之后开启的页面
Intent intent = new Intent(getApplicationContext(), DengluActivity.class);
startActivity(intent);
finish();
}
}, 3000);


}
}

package vip.wfb.bigwork3;




import android.app.Activity;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;


import androidx.appcompat.app.AlertDialog;


import java.util.HashMap;
import java.util.Map;


public class ZhuyeActivity extends Activity {
//声明组件
private TextView text;
private Button but_tuichu;
private Map map = new HashMap();


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//去掉顶部的小框框
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_zhuye);
//获取组件
but_tuichu = findViewById(R.id.but_tuichu);
text = findViewById(R.id.text_we);
//账号与人名对应
map.put("zhangsan", "张三");
map.put("lisi", "李四");
map.put("wangwu", "王五");
//获取用户登录的账号
final Intent intent = getIntent();
String name = intent.getStringExtra("name");
text.setText("欢迎您：" + map.get(name));
//创建单击监听
but_tuichu.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
new AlertDialog.Builder(ZhuyeActivity.this)
.setTitle("确认退出")
.setIcon(R.drawable.ic_launcher_foreground)
.setMessage("是否确认退出！")
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent intent1 = new Intent(getApplicationContext(), DengluActivity.class);
startActivity(intent1);
finish();
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(), "取消退出!", Toast.LENGTH_LONG).show();
}
})
.create()
.show();
}
});


}
}

package vip.wfb.bigwork3;




import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;


import java.util.HashMap;
import java.util.Map;
import java.util.Set;


public class DengluActivity extends Activity {
//声明组件
private Button but_denglu;
private EditText edit_name;
private EditText edit_pwd;
//定义业务逻辑所需要的变量
private Map<String, String> map = new HashMap<String, String>();
private String name;
private String pwd;
boolean isName = false;


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//去掉顶部的框框
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_denglu);
//获取组件
but_denglu = findViewById(R.id.but_denglu);
edit_name = findViewById(R.id.edit_name);
edit_pwd = findViewById(R.id.edit_pwd);
//储存账号密码
map.put("zhangsan", "123");
map.put("lisi", "456");
map.put("wangwu", "147");
//创建单击监听
but_denglu.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//获取用户输入的值
name = edit_name.getText().toString();
pwd = edit_pwd.getText().toString();
//判断是否有忘记输入的内容
if (name.equals("") || name == null) {
Toast.makeText(getApplicationContext(), "请输入账号！", Toast.LENGTH_LONG).show();
} else if (pwd.equals("") || pwd == null) {
Toast.makeText(getApplicationContext(), "请输入密码！", Toast.LENGTH_LONG).show();
} else {
//判断输入的账号是否存在
Set<String> set = map.keySet();
for (String st : set) {
if (st.equals(name)) {
isName = true;
}
}
if (isName) {
//判断密码输入是否正确
if (map.get(name).equals(pwd)) {
//账号密码都正确跳转界面
Intent intent = new Intent(getApplicationContext(), ZhuyeActivity.class);
intent.putExtra("name", name);
startActivity(intent);
finish();
} else {
Toast.makeText(getApplicationContext(), "密码错误！", Toast.LENGTH_LONG).show();
}
} else {
Toast.makeText(getApplicationContext(), "没有此账号！", Toast.LENGTH_LONG).show();
}
}
}
});


}
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/welcom"
android:orientation="vertical">



LinearLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">


<TextView
android:id="@+id/text_we"
android:layout_width="match_parent"
android:layout_height="60dp"
android:gravity="center_vertical"
android:background="#1EB9F2"
android:textColor="#ffffff"
android:textSize="30sp" >


<Button
android:id="@+id/but_tuichu"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="30dp"
android:layout_marginTop="90dp"
android:layout_marginRight="30dp"
android:background="#1EB9F2"
android:text="退出"
android:textColor="#ffffff"
android:textSize="30sp" >
LinearLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">


<ImageView
android:layout_width="match_parent"
android:layout_height="90dp"
android:layout_gravity="center"
android:layout_marginTop="60dp"
android:src="@drawable/qq" >


<EditText
android:id="@+id/edit_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_marginTop="20dp"
android:layout_marginRight="20dp"
android:hint="QQ账号/手机号/邮箱"
android:singleLine="true" >


<EditText
android:id="@+id/edit_pwd"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_marginTop="20dp"
android:layout_marginRight="20dp"
android:hint="密码"
android:inputType="textPassword"
android:singleLine="true" />


<Button
android:id="@+id/but_denglu"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="20dp"
android:background="#1EB9F2"
android:text="登录"
android:textColor="#ffffff"
android:textSize="20sp" />


LinearLayout>