Android Service组件部署服务端

最新推荐文章于 2021-05-25 20:46:18 发布

Wicd

最新推荐文章于 2021-05-25 20:46:18 发布

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本文链接：https://blog.youkuaiyun.com/Wicd123/article/details/80772594

本文介绍了一种基于Android平台的服务器-客户端模式APP的构建思路。通过部署Service组件作为服务器端，使用SQLite进行数据存储，并通过AIDL实现客户端与服务器端的数据交互。

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2018/6/22 CZ 13:45 c.~

Android

最近在构想，在Android下，如何去完成一个APP，它具有服务器-客户端模式。

服务器上运行SQLite，客户端通过远程访问去获取SQLite数据,进行一系列的访问，增删改查操作。

构想过程:

1.部署服务器模式。使用Android自带的Service组件，可以提供远程服务。

2.部署客户端。使用ServiceConnection 去实现Service的回调Onbind()的方法。

具体过程:

1.Service

在部署服务端时，遇到了几个问题。

1.Service是什么。

是android模式下自带的四大组件之一。它跟进程类似。一旦创建，不去销毁，就会一直运行在android的后台。

2.如何创建service

class MyService extends Service{}     //继承Service即可

3.如何开启service

------------开启service有两种方法

-----------1.BindService()//unbind（）

bindService 可以使Activity和Service进行数据交换，通信等远程操作。

                bindservice(intent,serviceConnection,int falgs)  //一般多用于隐式意图

----------2. StartService()//stopservice（）

              startservice（intent）//无法进行通信及数据交换

4.activity界面和Remote-service之间是如何进行交互的

private ServiceConnection connection =new ServiceConnection() {
		
		@Override
		public void onServiceDisconnected(ComponentName name) {
			// TODO 解除连接的操作
			//mBound=false;
		}
		
		@Override
		public void onServiceConnected(ComponentName name, IBinder service) {
			// TODO 获取远程Service
			Log.d("Client-Service","onServiceConnected");
			ist=IStudent.Stub.asInterface(service);
			Log.d("ist","学生对象的内存地址="+ist);
		}
	};

Service---MainActivity部署直接贴代码

public class MainActivity extends Activity implements OnClickListener{
    
	Button btn1;
	Button btn2;
	IStudent ist;
	boolean mBound=false;
	IStudentImpl iStudentImpl;
	public static Context context;
	//public static SQLiteCreateHelper helper;
	
	private ServiceConnection connection = new ServiceConnection() {
		
		@Override
		public void onServiceDisconnected(ComponentName name) {
			// TODO Auto-generated method stub
			mBound=false;
		}
		
		@Override
		public void onServiceConnected(ComponentName name, IBinder service) {
			// TODO Auto-generated method stub
			Log.i("studentInfo","onServiceConnected");
			ist=IStudent.Stub.asInterface(service);
			Log.i("studentInfo","学生对象内存地址="+ist);	
			try {
				//SQLiteCreateHelper helper =new SQLiteCreateHelper(MainActivity.this);
				//sqL.getWritableDatabase();
				
        		boolean b =ist.selectID("0112");
        		Log.d("个人密码:","是否正确="+b);
			} catch (Exception e) {
				// TODO: handle exception
				e.printStackTrace();
			}
			mBound=true;
		}
	};
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		btn1=(Button)findViewById(R.id.button1);
		btn2=(Button)findViewById(R.id.button2);
		
		btn1.setOnClickListener(this);
		btn2.setOnClickListener(this);
		context=MainActivity.this;
	}
	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		switch (v.getId()) {
		case R.id.button1:
			      Intent intent = new Intent(MainActivity.this,MyService.class);
			      bindService(intent, connection, BIND_AUTO_CREATE);
			break;
		case R.id.button2:
			if(mBound)
			{
				unbindService(connection);
				mBound=false;
			}
			break;
		default:
			break;
		}
	}
}

Service-SQLite部署//贴代码

public class SQLiteCreateHelper extends SQLiteOpenHelper{
    
	public static Cursor cursor;
	public SQLiteCreateHelper(Context context) {
		super(context,"subject1.db",null,5);
		// TODO Auto-generated constructor stub
	}

	@Override
	public void onCreate(SQLiteDatabase db) {
		// TODO Auto-generated method stub
		ContentValues values=new ContentValues();
		onOpen(db);
		String sysName="root";
		String sysID="0112";
		String sysPosition="秘书";
		String syspassword="123456";
		values.put("stuID", sysID);
		values.put("stuName", sysName);
		values.put("stuPosition", sysPosition);
		values.put("stupassword", syspassword);
		
		// TODO Auto-generated method stub
		//学生信息表,
		db.execSQL("create table stuInfo ( stuID varchar(20) primary key,"+"stuName varchar(20) not null,"
		+"stuPosition varchar(50) not null,"+"stupassword varchar(15) not null);");
		//教师信息表
		db.execSQL("create table teachInfo (teaID varchar(20) not null primary key ,"+"teaName varchar(20) not null ,"
		+"teaPosition varchar(50) not null,"+"teapassword varchar(15) not null);");
		//管理员信息表
		db.execSQL("create table sysInfo (  sysID varchar(20) primary key ,"+"sysName varchar(20) not null ,"
		+"sysPosition varchar(50) not null,"+"syspassword varchar(15) not null);");
		//课程表信息
		db.execSQL("create table subject ( subID varchar(15) primary key ,"+"subName varchar(25) not null,"+"subTotalStu integer );");
		//学生选课表+成绩+课堂评价+出勤情况
		db.execSQL("create table stuSelectSub ( stuID varchar(20) not null,"+"subID varchar(15) not null,"+"subName varchar(25) not null,"
		+"stuPosition varchar(50) not null,"+"commandS1 integer ,"+"commandS2 integer ,"+"commandS3 integer,"+"commandS4 integer,"+"workScroe integer ,"
		+"totduty integer not null,"+"subevalute varchar(20) not null,FOREIGN KEY(stuID) REFERENCES stuInfo(stuID),FOREIGN KEY(subID) REFERENCES subject(subID));");
		db.execSQL("create table stuInfo2 (stuID varchar(20) primary key,"+"Nicheng varchar(20) not null,"
		+"personInfo varchar(50) not null);");
		db.execSQL("create table teaInfo2 (teaID varchar(20) primary key,"+"Nicheng varchar(20) not null,"
				+"personInfo varchar(50) not null);");
		db.insert("stuInfo",null, values);
	}

	@Override
	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
		// TODO Auto-generated method stub
		db.execSQL("alter table person add account varchar(20)");
	}
}

Service-Dataservice部署//

public class MyService extends Service{
     
	public static  SQLiteCreateHelper helper;//全局变量，如果不创建，会导致在访问数据库时，无法操作
	IStudentImpl istu = new IStudentImpl();
	@Override
	public IBinder onBind(Intent intent) {
		// TODO Auto-generated method stub
		helper=new SQLiteCreateHelper(MainActivity.context);
		return istu;
	}

	@Override
	public void onCreate() {
		// TODO Auto-generated method stub
		super.onCreate();
		Log.d("Server-Service","onCreate");
	}

	@Override
	public int onStartCommand(Intent intent, int flags, int startId) {
		// TODO Auto-generated method stub
		Log.d("Server-Service","onStartCommand");
		return super.onStartCommand(intent, flags, startId);
	}

	@Override
	public void onDestroy() {
		// TODO Auto-generated method stub
		Log.d("Server-Service","onDestroy");
		super.onDestroy();
	}

	@Override
	public boolean onUnbind(Intent intent) {
		// TODO Auto-generated method stub
		Log.d("Server-Service","onUnbind");
		return super.onUnbind(intent);
	}
    
}

AIDL 接口

package com.example.servicetest01;//包名一定要跟原本的包名一样，否则gen无法自动生成.Java文件

interface IStudent{
   boolean selectID(String id);
   String selectPass(String id);
}

IStudentImpl 具体实现接口类

public class IStudentImpl extends IStudent.Stub{
     
	//private  SQLiteCreateHelper helper;
	private Context context;
	//private Cursor cursor;
	public IStudentImpl()
	{    
		System.out.println("数据库连接成功");
		//this.helper=MyService.helper;
		this.context=MainActivity.context;
	}	
	@Override
	public boolean selectID(String id) throws RemoteException {
		// TODO Auto-generated method stub
		    SQLiteDatabase db=MyService.helper.getWritableDatabase();
		    SQLiteCreateHelper.cursor=db.rawQuery("select stuID from stuInfo where stuID=?",new String[]{id});
	       boolean result=SQLiteCreateHelper.cursor.moveToNext();
	       SQLiteCreateHelper.cursor.close();
	       db.close();
	       return result;
	}
	@Override
	public String selectPass(String id) throws RemoteException {
		// TODO Auto-generated method stub
		String pass="";
		SQLiteDatabase db=MyService.helper.getWritableDatabase();
		SQLiteCreateHelper.cursor=db.rawQuery("select stupassword from stuInfo where stuID=?", new String[]{id});
		if(SQLiteCreateHelper.cursor==null)
		{
			Toast.makeText(context, "无数据", Toast.LENGTH_LONG).show();
		}
		else {
			while(SQLiteCreateHelper.cursor.moveToNext())
			{
				pass = SQLiteCreateHelper.cursor.getString(SQLiteCreateHelper.cursor.getColumnIndex("stupassword"));
			}
		}	
		SQLiteCreateHelper.cursor.close();
		db.close();
		return pass;
	}
}

！！！！！！！！！！！！！！！！最后注册清单一定要写！！！！！！！！！！！！！！！！

<service android:name=".MyService">
            <intent-filter >
                <action android:name="com.example.servicetest01.MyService"/>//设置action可以使其他app也能调用此Impl
            </intent-filter>
        </service>

//服务端部署完成

//关于AIDL在下一篇详讲