通知与服务——服务Service——服务的绑定与解绑&延迟绑定服务与解绑服务

悠悠 2023-09-28 16:32 141阅读 0赞

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布局：

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代码：

package com.example.myapplication;
    
    import androidx.appcompat.app.AppCompatActivity;
    
    import android.content.ComponentName;
    import android.content.Context;
    import android.content.Intent;
    import android.content.ServiceConnection;
    import android.os.Bundle;
    import android.os.IBinder;
    import android.util.Log;
    import android.view.View;
    import android.widget.TextView;
    
    public class MainActivity8 extends AppCompatActivity implements View.OnClickListener
    {
    
        private static final String TAG = "BindImmediateActivity";
        private static TextView tv_immediate; // 声明一个文本视图对象
        private Intent mIntent; // 声明一个意图对象
        private static String mDesc; // 日志描述
    
    
        @Override
        protected void onCreate(Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main8);
    
    
            tv_immediate = findViewById(R.id.tv_immediate);
    
    
            findViewById(R.id.btn_start_bind).setOnClickListener(this);
            findViewById(R.id.btn_unbind).setOnClickListener(this);
    
    
            mDesc = "";
    
            // 创建一个通往立即绑定服务的意图
            mIntent = new Intent(this, com.example.myapplication.BindImmediateService.class);
        }
    
        @Override
        public void onClick(View v)
        {
            if (v.getId() == R.id.btn_start_bind)     // 点击了绑定服务按钮
            {
                // 绑定服务。如果服务未启动，则系统先启动该服务再进行绑定
                boolean bindFlag = bindService(mIntent, mFirstConn, Context.BIND_AUTO_CREATE);
                Log.d(TAG, "bindFlag=" + bindFlag);
            }
            else if (v.getId() == R.id.btn_unbind)    // 点击了解绑服务按钮
            {
                if (mBindService != null)
                {
                    // 解绑服务。如果先前服务立即绑定，则此时解绑之后自动停止服务
                    unbindService(mFirstConn);
                    mBindService = null;
                }
            }
        }
    
        public static void showText(String desc)
        {
            if (tv_immediate != null)
            {
                mDesc = String.format("%s%s %s\n", mDesc, DateUtil.getNowDateTime("HH:mm:ss"), desc);
                tv_immediate.setText(mDesc);
            }
        }
    
        private com.example.myapplication.BindImmediateService mBindService; // 声明一个服务对象
    
        private ServiceConnection mFirstConn = new ServiceConnection()
        {
    
            // 获取服务对象时的操作
            public void onServiceConnected(ComponentName name, IBinder service)
            {
                // 如果服务运行于另外一个进程，则不能直接强制转换类型，否则会报错
                mBindService = ((com.example.myapplication.BindImmediateService.LocalBinder) service).getService();
                Log.d(TAG, "onServiceConnected");
            }
    
            // 无法获取到服务对象时的操作
            public void onServiceDisconnected(ComponentName name)
            {
                mBindService = null;
                Log.d(TAG, "onServiceDisconnected");
            }
        };
    
    }

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BindImmediateService

package com.example.myapplication;
    
    import android.app.Service;
    import android.content.Intent;
    import android.os.Binder;
    import android.os.IBinder;
    import android.util.Log;
    
    public class BindImmediateService extends Service
    {
        private static final String TAG = "BindImmediateService";
        private final IBinder mBinder = new LocalBinder(); // 创建一个粘合剂对象
    
        // 定义一个当前服务的粘合剂，用于将该服务黏到活动页面的进程中
        public class LocalBinder extends Binder
        {
            public BindImmediateService getService()
            {
                return BindImmediateService.this;
            }
        }
    
        private void refresh(String text)
        {
            Log.d(TAG, text);
            MainActivity8.showText(text);
        }
    
    
        @Override
        public void onCreate() { // 创建服务
            super.onCreate();
            refresh("onCreate");
        }
    
    
        @Override
        public void onDestroy() { // 销毁服务
            super.onDestroy();
            refresh("onDestroy");
        }
    
    
        @Override
        public IBinder onBind(Intent intent) { // 绑定服务。返回该服务的粘合剂对象
            Log.d(TAG, "绑定服务开始旅程！");
            refresh("onBind");
            return mBinder;
        }
    
    
        @Override
        public void onRebind(Intent intent) { // 重新绑定服务
            super.onRebind(intent);
            refresh("onRebind");
        }
    
    
        @Override
        public boolean onUnbind(Intent intent) { // 解绑服务
            Log.d(TAG, "绑定服务结束旅程！");
            refresh("onUnbind");
            return true; // 返回false表示只能绑定一次，返回true表示允许多次绑定
        }
    
    }

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DateUtil

package com.example.myapplication;
    
    import android.annotation.SuppressLint;
    import android.text.TextUtils;
    
    import java.text.SimpleDateFormat;
    import java.util.Calendar;
    import java.util.Date;
    
    @SuppressLint("SimpleDateFormat")
    public class DateUtil
    {
        // 获取当前的日期时间
        public static String getNowDateTime(String formatStr)
        {
            String format = formatStr;
            if (TextUtils.isEmpty(format))
            {
                format = "yyyyMMddHHmmss";
            }
            SimpleDateFormat sdf = new SimpleDateFormat(format);
            return sdf.format(new Date());
        }
    
        // 获取当前的时间
        public static String getNowTime()
        {
            SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
            return sdf.format(new Date());
        }
    
        // 获取当前的时间(精确到毫秒)
        public static String getNowTimeDetail() 
        {
            SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss.SSS");
            return sdf.format(new Date());
        }
    
        public static String getNowDate() 
        {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
            return sdf.format(new Date());
        }
    
        public static String getDate(Calendar calendar) 
        {
            Date date = calendar.getTime();
            // 创建一个日期格式化的工具
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            // 将当前日期时间按照指定格式输出格式化后的日期时间字符串
            return sdf.format(date);
        }
    
        public static String getMonth(Calendar calendar)
        {
            Date date = calendar.getTime();
            // 创建一个日期格式化的工具
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
            // 将当前日期时间按照指定格式输出格式化后的日期时间字符串
            return sdf.format(date);
        }
    
        public static Date formatString(String strTime) 
        {
            Date date = new Date();
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            try {
                date = sdf.parse(strTime);
            } catch (Exception e) {
                e.printStackTrace();
            }
            return date;
        }
    
    }

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布局：

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代码：

package com.example.myapplication;
    
    import androidx.appcompat.app.AppCompatActivity;
    
    import android.content.ComponentName;
    import android.content.Context;
    import android.content.Intent;
    import android.content.ServiceConnection;
    import android.os.Bundle;
    import android.os.IBinder;
    import android.util.Log;
    import android.view.View;
    import android.widget.TextView;
    
    public class MainActivity9 extends AppCompatActivity implements View.OnClickListener
    {
    
        private static final String TAG = "BindDelayActivity";
        private static TextView tv_delay;
        private Intent mIntent; // 声明一个意图对象
        private static String mDesc;
    
    
        @Override
        protected void onCreate(Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main9);
    
    
    
            tv_delay = findViewById(R.id.tv_delay);
    
            findViewById(R.id.btn_start).setOnClickListener(this);
            findViewById(R.id.btn_bind).setOnClickListener(this);
            findViewById(R.id.btn_unbind).setOnClickListener(this);
            findViewById(R.id.btn_stop).setOnClickListener(this);
    
            mDesc = "";
    
            // 创建一个通往延迟绑定服务的意图
            mIntent = new Intent(this, BindDelayService.class);
        }
    
        @Override
        public void onClick(View v)
        {
            if (v.getId() == R.id.btn_start)  // 点击了开始服务按钮
            {
                startService(mIntent); // 启动服务
            }
            else if (v.getId() == R.id.btn_bind)   // 点击了绑定服务按钮
            {
                boolean bindFlag = bindService(mIntent, mFirstConn, Context.BIND_AUTO_CREATE); // 绑定服务
                Log.d(TAG, "bindFlag=" + bindFlag);
            }
            else if (v.getId() == R.id.btn_unbind)  // 点击了解绑服务按钮
            {
                if (mBindService != null)
                {
                    unbindService(mFirstConn); // 解绑服务
                    mBindService = null;
                }
            } else if (v.getId() == R.id.btn_stop)   // 点击了停止服务按钮
            {
                stopService(mIntent); // 停止服务
            }
        }
    
        public static void showText(String desc)
        {
            if (tv_delay != null)
            {
                mDesc = String.format("%s%s %s\n", mDesc, DateUtil.getNowDateTime("HH:mm:ss"), desc);
                tv_delay.setText(mDesc);
            }
        }
    
        private BindDelayService mBindService; // 声明一个服务对象
    
        private ServiceConnection mFirstConn = new ServiceConnection()
        {
    
            // 获取服务对象时的操作
            public void onServiceConnected(ComponentName name, IBinder service)
            {
                // 如果服务运行于另外一个进程，则不能直接强制转换类型，否则会报错
                mBindService = ((BindDelayService.LocalBinder) service).getService();
                Log.d(TAG, "onServiceConnected");
            }
    
            // 无法获取到服务对象时的操作
            public void onServiceDisconnected(ComponentName name)
            {
                mBindService = null;
                Log.d(TAG, "onServiceDisconnected");
            }
        };
    
    }

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BindDelayService

package com.example.myapplication;
    
    import android.app.Service;
    import android.content.Intent;
    import android.os.Binder;
    import android.os.IBinder;
    import android.util.Log;
    
    public class BindDelayService extends Service
    {
        private static final String TAG = "BindDelayService";
        private final IBinder mBinder = new LocalBinder(); // 创建一个粘合剂对象
    
        // 定义一个当前服务的粘合剂，用于将该服务黏到活动页面的进程中
        public class LocalBinder extends Binder
        {
            public BindDelayService getService()
            {
                return BindDelayService.this;
            }
        }
    
        private void refresh(String text)
        {
            Log.d(TAG, text);
            MainActivity9.showText(text);
        }
    
        @Override
        public void onCreate()   // 创建服务
        {
            super.onCreate();
            refresh("onCreate");
        }
    
        @Override
        public void onDestroy()         // 销毁服务
        {
            super.onDestroy();
            refresh("onDestroy");
        }
    
        @Override
        public IBinder onBind(Intent intent)  // 绑定服务。返回该服务的粘合剂对象
        {
            Log.d(TAG, "绑定服务开始旅程！");
            refresh("onBind");
            return mBinder;
        }
    
        @Override
        public void onRebind(Intent intent)    // 重新绑定服务
        {
            super.onRebind(intent);
            refresh("onRebind");
        }
    
        @Override
        public boolean onUnbind(Intent intent)   // 解绑服务
        {
            Log.d(TAG, "绑定服务结束旅程！");
            refresh("onUnbind");
            return true; // 返回false表示只能绑定一次，返回true表示允许多次绑定
        }
    
    }

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DateUtil

package com.example.myapplication;
    
    import android.annotation.SuppressLint;
    import android.text.TextUtils;
    
    import java.text.SimpleDateFormat;
    import java.util.Calendar;
    import java.util.Date;
    
    @SuppressLint("SimpleDateFormat")
    public class DateUtil
    {
        // 获取当前的日期时间
        public static String getNowDateTime(String formatStr)
        {
            String format = formatStr;
            if (TextUtils.isEmpty(format))
            {
                format = "yyyyMMddHHmmss";
            }
            SimpleDateFormat sdf = new SimpleDateFormat(format);
            return sdf.format(new Date());
        }
    
        // 获取当前的时间
        public static String getNowTime()
        {
            SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
            return sdf.format(new Date());
        }
    
        // 获取当前的时间(精确到毫秒)
        public static String getNowTimeDetail()
        {
            SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss.SSS");
            return sdf.format(new Date());
        }
    
        public static String getNowDate()
        {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
            return sdf.format(new Date());
        }
    
        public static String getDate(Calendar calendar)
        {
            Date date = calendar.getTime();
            // 创建一个日期格式化的工具
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            // 将当前日期时间按照指定格式输出格式化后的日期时间字符串
            return sdf.format(date);
        }
    
        public static String getMonth(Calendar calendar)
        {
            Date date = calendar.getTime();
            // 创建一个日期格式化的工具
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
            // 将当前日期时间按照指定格式输出格式化后的日期时间字符串
            return sdf.format(date);
        }
    
        public static Date formatString(String strTime)
        {
            Date date = new Date();
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            try {
                date = sdf.parse(strTime);
            } catch (Exception e) {
                e.printStackTrace();
            }
            return date;
        }
    
    }

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