城市线程练习题

随便选择两个城市作为预选旅游目标。实现两个独立的线程分别显示10次城市名，每次显示后休眠一段随机时间(1000ms以内)，哪个先显示完毕，就决定去哪个城市。分别用Runnable接口和Thread类实现。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.wang.xuexi.TestActivity4"
    android:orientation="vertical">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="开始"
        android:id="@+id/bt_1"
        android:onClick="bt_OnClick"/>

</LinearLayout>

package com.example.wang.xuexi;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.support.annotation.RequiresPermission;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.util.Random;

public class TestActivity4 extends AppCompatActivity {

    Button bt_1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test4);

        bt_1=(Button)findViewById(R.id.bt_1);

    }

    Random random=new Random();

    public void bt_OnClick(View v) {

        for (int i=0;i<10;i++)
        {
            new Thread(){
                @Override
                public void run() {
                    try{

                        Thread.sleep(random.nextInt(2000));
                    }catch (Exception e){

                    }
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {

                            bt_1.setText("济南");
                        }
                    });
                    return;
                }
            }.start();

            new Thread(new Runnable() {
                @Override
                public void run() {
                    try {
                        Thread.sleep(random.nextInt(2000));
                    }catch (Exception e){

                    }
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {

                            bt_1.setText("淄博");
                        }
                    });
                    return;
                }
            }).start();
        }

    }
}