基于Android平台的图书管理系统的制作（1）

  1 package com.example.administrator.library1;
  2 
  3 import android.content.Intent;
  4 import android.support.v7.app.AppCompatActivity;
  5 import android.os.Bundle;
  6 import android.view.Menu;
  7 import android.view.MenuItem;
  8 import android.view.View;
  9 import android.widget.Button;
 10 import android.widget.Toast;
 11 
 12 import org.litepal.LitePal;
 13 /*------
 14    郭志---18年暑假
 15  */
 16 
 17 public class MainActivity extends AppCompatActivity {
 18 
 19     private Button button_introduce,button_information,button_ranking,button_newBooks,button_register_student,button_blacklist;
 20     @Override
 21     public boolean onCreateOptionsMenu(Menu menu) {
 22         getMenuInflater().inflate(R.menu.main,menu);
 23         return true;
 24     }
 25 
 26     @Override
 27     public boolean onOptionsItemSelected(MenuItem item) {
 28         switch (item.getItemId())
 29         {
 30             case R.id.student_id:
 31                 Intent intent_student=new Intent(MainActivity.this,Login_student.class);
 32                 startActivity(intent_student);
 33                 break;
 34             /*case R.id.teacher_id:
 35                 Intent intent_teacher=new Intent(MainActivity.this,Login_teacher.class);
 36                 startActivity(intent_teacher);
 37                 break;*/
 38             case R.id.staff_id:
 39                 Intent intent_staff=new Intent(MainActivity.this,Login_staff.class);
 40                 startActivity(intent_staff);
 41                 break;
 42         }
 43         return true;
 44     }
 45 
 46     @Override
 47     protected void onCreate(Bundle savedInstanceState) {
 48         super.onCreate(savedInstanceState);
 49         setContentView(R.layout.activity_main);
 50         button_introduce=findViewById(R.id.introduce_id);
 51         button_register_student=findViewById(R.id.registerStudent_id);
 52         button_blacklist=findViewById(R.id.blacklist_id);
 53         button_information=findViewById(R.id.news_id);
 54         button_ranking=findViewById(R.id.ranking_id);
 55         button_newBooks=findViewById(R.id.newBook_id);
 56 
 57         button_introduce.setOnClickListener(new View.OnClickListener() {
 58             @Override
 59             public void onClick(View view) {
 60                 Intent intent=new Intent(MainActivity.this,Introduction.class);
 61                 startActivity(intent);
 62                 finish();
 63             }
 64         });
 65         button_register_student.setOnClickListener(new View.OnClickListener() {
 66             @Override
 67             public void onClick(View view) {
 68                 Intent intent=new Intent(MainActivity.this,Register_student.class);
 69                 startActivity(intent);
 70                 finish();
 71             }
 72         });
 73         button_blacklist.setOnClickListener(new View.OnClickListener() {
 74             @Override
 75             public void onClick(View view) {
 76                 Intent intent=new Intent(MainActivity.this,Blacklist.class);
 77                 startActivity(intent);
 78                 finish();
 79             }
 80         });
 81         button_information.setOnClickListener(new View.OnClickListener() {
 82             @Override
 83             public void onClick(View view) {
 84                 Intent intent=new Intent(MainActivity.this,News.class);
 85                 startActivity(intent);
 86                 finish();
 87             }
 88         });
 89         button_ranking.setOnClickListener(new View.OnClickListener() {
 90             @Override
 91             public void onClick(View view) {
 92                 Intent intent=new Intent(MainActivity.this,Ranking.class);
 93                 startActivity(intent);
 94                 finish();
 95             }
 96         });
 97         button_newBooks.setOnClickListener(new View.OnClickListener() {
 98             @Override
 99             public void onClick(View view) {
100                 Intent intent=new Intent(MainActivity.this,New_Books.class);
101                 startActivity(intent);
102                 finish();
103             }
104         });
105 
106     }
107 }

MainActivity.java