线程

package com.hanqi.zuoye;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;

import java.util.Random;

public class xianchengActivity extends AppCompatActivity {

    Button bt;
    Random r=new Random();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_xiancheng);
        bt=(Button)findViewById(R.id.bt);
    }

    public void bt1(View v){
        for( int i=0;i<10;i++){

            new Thread(

            ){
                @Override
                public void run() {
                    try {
                        Thread.sleep(r.nextInt(1000));
                       }
                    catch (Exception e){

                    }
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            bt.setText("城市1");
                        }
                    });

                    return;
                }
            }.start();
            new Thread(){
                @Override
                public void run() {

                    try {
                        Thread.sleep(r.nextInt(1000));
                    }
                    catch (Exception e){

                    } runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            bt.setText("城市2");
                        }
                    });

                    return;
                }
            }.start();
        }
    }
}