thread - race

RaceActivity.java

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package com.example.teacher.threadproj;

import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.SeekBar;

import com.example.teacher.threadproj.threads.HorseRunnable;

public class RaceActivity extends AppCompatActivity {

    Context context;

    SeekBar seekHorse1;
    SeekBar seekHorse2;

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

        setPointer();
    }

    private void setPointer() {
        context = this;

        seekHorse1 = findViewById(R.id.seek1);
        seekHorse2 = findViewById(R.id.seek2);

        Thread horseThread1 = new Thread(new HorseRunnable(context,seekHorse1,1));
        Thread horseThread2 = new Thread(new HorseRunnable(context,seekHorse2,2));

        horseThread1.start();
        horseThread2.start();
    }
}



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HorseRunnable.java
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package com.example.teacher.threadproj.threads;

import android.content.Context;
import android.os.Handler;
import android.widget.SeekBar;
import android.widget.Toast;

import java.util.Random;

/**
 * Created by teacher on 23/05/2018.
 */

public class HorseRunnable implements Runnable {

    private Context context;
    private SeekBar seekBar;
    private int id;

    public HorseRunnable(Context context,SeekBar seekBar, int id){
        this.context = context;
        this.seekBar = seekBar;
        this.id = id;

        this.seekBar.setProgress(0);
        this.seekBar.setMax(15);
    }

    @Override
    public void run() {

        for(int i=0; i<=seekBar.getMax(); i+=1){
            try {
                Thread.sleep(new Random().nextInt(500)+100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            seekBar.setProgress(i);
        }

        // android.os.Handler
        Handler handler = new Handler(context.getMainLooper());
        // handler can post code to execute on the ui thread. we get the ui thread by sending context.getMainLooper - the main (ui) thread

        // post notifies a thread that there is extra code to execute
        handler.post(new Runnable() {
            @Override
            public void run() {
                Toast.makeText(context, "horse number "+id+" finished", Toast.LENGTH_SHORT).show();

            }
        });

    }
}



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


    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/myRaceTtl"
        android:textAlignment="center"
        android:textSize="@dimen/ttl"/>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:layout_margin="@dimen/seekMargin"
        >


        <SeekBar
            android:layout_weight="1"
            android:id="@+id/seek1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:progress="0"
            android:max="100"
            />

        <SeekBar
            android:layout_weight="1"
            android:id="@+id/seek2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:progress="0"
            android:max="100"
            />



    </LinearLayout>

</LinearLayout>