1. 程式人生 > >實驗五 使用執行緒(系統時間校驗版)

實驗五 使用執行緒(系統時間校驗版)

實驗五 使用執行緒

實驗目的

熟悉和掌握Android執行緒的使用

實驗要求

  1. 完成一個秒錶,具備啟停功能,正確使用工作執行緒完成介面重新整理
  2. 分析秒錶的計時是否準確,原因是什麼,如何保證秒錶計時準確

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工程程式碼

專案工程結構圖
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MainActivity:

package com.example.wyx.exp_52;

import android.app.Activity;
import android.content.
Intent; import android.os.Handler; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; public class MainActivity extends AppCompatActivity { private static Handler handle = new Handler
(); private static long third; static TextView hour; static TextView minute; static TextView miao; Button start; Button stop; Button qingling; public static void Update(long ms){ third=ms; handle.post(RefreshLable); } private static Runnable RefreshLable=
new Runnable(){ @Override public void run(){ //hour.setText(String.valueOf(first)); //minute.setText(String.valueOf(second));4 //miao.setText(String.valueOf(third)); if(third<6000) { if(third<100) miao.setText(Long.toString(third)); else{ miao.setText(Long.toString(third%100)); minute.setText(Long.toString(third/100)); } //數字轉換字串 } else { hour.setText(Long.toString(third/6000)); minute.setText(Long.toString((third%6000)/100)); miao.setText(Long.toString((third%6000)%100)); } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); hour=(TextView)findViewById(R.id.textView2); minute=(TextView)findViewById(R.id.textView4); miao=(TextView)findViewById(R.id.textView6); qingling=(Button)findViewById(R.id.button4); start=(Button)findViewById(R.id.button5); stop=(Button)findViewById(R.id.button6); final Intent serviceIntent=new Intent(this,MainService.class); qingling.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { stopService(serviceIntent); hour.setText("00"); minute.setText("00"); miao.setText("00"); } }); start.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { startService(serviceIntent); } }); stop.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { stopService(serviceIntent); } }); } }

MainService:

package com.example.wyx.exp_52;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import java.util.Calendar;
import java.util.Date;

public class MainService extends Service {
    private Thread workthread;
    private long ms,ms0;
    private int ts1,ts2;
    private boolean isstart=false;


    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        workthread  = new Thread(null,backgroundWork,"workthread");

    }

    @Override
    public void onStart(Intent intent, int startId) {
        super.onStart(intent, startId);
        if(!workthread.isAlive()){
            workthread.start();
            /*Calendar cal=Calendar.getInstance();
            min=cal.get(Calendar.MINUTE);
            s=cal.get(Calendar.SECOND);
            ms=cal.get(Calendar.MILLISECOND);*/
            ms=System.currentTimeMillis();



        }
    }



    @Override
    public void onDestroy() {
        super.onDestroy();
        workthread.interrupt();
    }

    private Runnable backgroundWork =new Runnable() {
        @Override
        public void run() {
            try {
            while(!workthread.interrupted())
            {
                   // Calendar cal=Calendar.getInstance();
                    //int min0=Math.abs(cal.get(Calendar.MINUTE)-min);
                    //int s0=Math.abs(cal.get(Calendar.SECOND)-s);
                    //int ms0=Math.abs(cal.get(Calendar.MILLISECOND)-ms)/10;

                    ms0=(System.currentTimeMillis()-ms)/10;


                    /*if(s0!=ts2) {
                        ts1 = ts2;
                        ts2 = s0;
                        if(ts2<ts1){
                            ts1=ts1;
                        }
                    }*/


                    //int ms0=Math.abs(cal.get(Calendar.MILLISECOND)-ms)/10;
                    MainActivity.Update(ms0);
                    Thread.sleep(10);
            }
            } catch (InterruptedException e) {
                    e.printStackTrace();
                }


        }
    };
/*
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        if (!workthread.isAlive()) {
            workthread.start();
            Calendar cal = Calendar.getInstance();
            min = cal.get(Calendar.MINUTE);
            s = cal.get(Calendar.SECOND);
            ms = cal.get(Calendar.MILLISECOND);

        }
        return START_STICKY;
    }*/
}

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">


    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="25dp"
            android:text="秒錶"
            android:textColor="#000000"
            android:textSize="30dp"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBaseline="@+id/textView3"
            android:layout_alignBottom="@+id/textView3"
            android:layout_toStartOf="@+id/textView3"
            android:text="00"
            android:textColor="#000000"
            android:textSize="30dp"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/textView4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/textView"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="14dp"
            android:text="00"
            android:textColor="#000000"
            android:textSize="30dp"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/textView6"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBaseline="@+id/textView5"
            android:layout_alignBottom="@+id/textView5"
            android:layout_toEndOf="@+id/textView5"
            android:text="00"
            android:textColor="#000000"
            android:textSize="30dp"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/textView3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBaseline="@+id/textView4"
            android:layout_alignBottom="@+id/textView4"
            android:layout_toStartOf="@+id/textView4"
            android:text=":"
            android:textColor="#000000"
            android:textSize="30dp"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/textView5"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBaseline="@+id/textView4"
            android:layout_alignBottom="@+id/textView4"
            android:layout_toEndOf="@+id/textView4"
            android:text=":"
            android:textColor="#000000"
            android:textSize="30dp"
            android:textStyle="bold" />

        <LinearLayout
            android:layout_width="230dp"
            android:layout_height="60dp"
            android:layout_below="@+id/textView2"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="17dp"
            android:orientation="horizontal">

            <Button
                android:id="@+id/button4"
                android:layout_width="70dp"
                android:layout_height="wrap_content"
                android:text="清零"
                android:textSize="20dp"/>

            <Button
                android:id="@+id/button5"
                android:layout_width="70dp"
                android:layout_height="wrap_content"
                android:layout_marginLeft="10dp"
                android:text="計時"
                android:textSize="20dp"/>

            <Button
                android:id="@+id/button6"
                android:layout_width="70dp"
                android:layout_height="wrap_content"
                android:layout_marginLeft="10dp"
                android:text="停止"
                android:textSize="20dp"/>

        </LinearLayout>


    </RelativeLayout>
</LinearLayout>


AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.wyx.exp_52">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <service
            android:name=".MainService"
            android:enabled="true"
            android:exported="true"></service>
    </application>

</manifest>

實現效果

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