多线程——异步服务IntentService

秒速五厘米 2023-09-28 16:33 121阅读 0赞

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布局：

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代码：

package com.example.myapplication;
    
    import android.annotation.SuppressLint;
    import android.content.Intent;
    import android.os.Bundle;
    import android.os.Handler;
    import android.os.Looper;
    import android.view.View;
    import android.widget.TextView;
    import androidx.appcompat.app.AppCompatActivity;
    
    
    @SuppressLint("SetTextI18n")
    public class MainActivity extends AppCompatActivity implements View.OnClickListener
    
    {
        private TextView tv_intent;
        private Handler mHandler = new Handler(Looper.myLooper()); // 声明一个处理器对象
    
        @Override
        protected void onCreate(Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
    
            tv_intent = findViewById(R.id.tv_intent);
    
            findViewById(R.id.btn_intent).setOnClickListener(this);
    
            mHandler.postDelayed(mService, 100); // 延迟100毫秒后启动异步任务
        }
    
        @Override
        public void onClick(View v)
        {
            if (v.getId() == R.id.btn_intent)
            {
                tv_intent.setText(DateUtil.getNowTime() + " 您轻轻点了一下下(异步服务正在运行，不影响您在界面操作)");
            }
        }
    
        private Runnable mService = new Runnable()
        {
            @Override
            public void run()
            {
                // 构建通往异步服务的意图
                Intent intent = new Intent(MainActivity.this, AsyncService.class);
                startService(intent); // 启动意图设定的异步服务
            }
        };
    
    }

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AsyncService

package com.example.myapplication;
    
    import android.content.Intent;
    import android.app.IntentService;
    import android.util.Log;
    
    public class AsyncService extends IntentService
    {
        private static final String TAG = "AsyncService";
    
        public AsyncService()
        {
            super("com.example.chapter11.service.AsyncService");
        }
    
        // onStartCommand运行于主线程
        public int onStartCommand(Intent intent, int flags, int startid)
        {
            Log.i(TAG, "onStartCommand");
            // 试试在onStartCommand里面沉睡，页面按钮是不是无法点击了？
    //        try {
    //            Thread.sleep(30*1000);
    //        } catch (InterruptedException e) {
    //            e.printStackTrace();
    //        }
            return super.onStartCommand(intent, flags, startid);
        }
    
        // onHandleIntent运行于分线程
        protected void onHandleIntent(Intent intent)
        {
            Log.d(TAG, "begin onHandleIntent");
            // 在onHandleIntent这里执行耗时任务，不会影响页面的处理
            try
            {
                Thread.sleep(30 * 1000);
            }
            catch (InterruptedException e)
            {
                e.printStackTrace();
            }
            Log.d(TAG, "end onHandleIntent");
        }
    
    }

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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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