android 图书管理系统源码

【实例简介】Android项目源码大学生毕设图书管理系统

【实例截图】

【核心代码】

package com.baizhi;

import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.baizhi.util.MySQLiteHelper;

public class MainActivity extends Activity {

	private EditText username, password;
	private Button login;
	private TextView tvRegister,tvAdmin;
	private String vip;

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

		init();
		login.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View arg0) {

				if (checkDate()) {
					if (UserLoginCheck(username.getText().toString().trim(),
							password.getText().toString().trim())) {
						/*Toast.makeText(MainActivity.this, "登录成功",
								Toast.LENGTH_SHORT).show();*/
						Intent intent = new Intent(MainActivity.this,
								CategoryActivity.class);
						intent.putExtra("name",username.getText().toString().trim());
						intent.putExtra("password", password.getText().toString().trim());
						intent.putExtra("vip", vip);
						startActivity(intent);
					} else {
						Toast.makeText(MainActivity.this, "账号或密码错误",
								Toast.LENGTH_SHORT).show();
					}
				} else {
					Toast.makeText(MainActivity.this, "请输入账号和密码",
							Toast.LENGTH_SHORT).show();
				}
			}
		});

		tvRegister.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View arg0) {
				Intent intent = new Intent(MainActivity.this,
						RegisterActivity.class);
				startActivity(intent);
			}
		});
		
		tvAdmin.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View arg0) {
				Intent intent = new Intent(MainActivity.this,
						AdminActivity.class);
				startActivity(intent);
			}
		});

	}

	private void init() {
		username = (EditText) findViewById(R.id.et_username);
		password = (EditText) findViewById(R.id.et_password);
		login = (Button) findViewById(R.id.bt_login);
		tvRegister = (TextView) findViewById(R.id.tv_register);
		tvAdmin = (TextView)findViewById(R.id.tv_guanliyuan);
	}

	private boolean checkDate() {
		String usernameStr = username.getText().toString().trim();
		String passwordStr = password.getText().toString().trim();
		if (!usernameStr.equals("") && !passwordStr.equals("")) {
			return true;
		} else {
			return false;
		}
	}

	private boolean UserLoginCheck(String username, String password) {
		// 创建SQLiteOpenHelpter对象
		MySQLiteHelper helper = new MySQLiteHelper(MainActivity.this,
				"baizhi.db", null, 1);
		// 获得getWritableDatabase()方法进行增，删，改
		SQLiteDatabase database = helper.getWritableDatabase();
		String sql = "select * from user where u_name like ? and u_password like ?";
		Cursor cursor = database.rawQuery(sql, new String[] { username,
				password });
		boolean moveToNext = cursor.moveToNext();
		if (moveToNext) {
			vip = cursor.getString(cursor.getColumnIndex("u_vip"));
		}
		return moveToNext;
	}
}