java项目一次执行所有操作
我正在做一个安卓simon says应用程序，我正在启动循环， 在这个例子中，我定义了它，所以它会点亮4种颜色，因为有数字点亮相应数字的数组有4个单元格长
不幸的是，它同时点亮了所有的颜色，你无法区分顺序，我试图弄清楚为什么会这样，以及我如何让它同时点亮一种颜色这是我的主要活动和java Cals的代码
以下是活动：
package com.gabie212.simonsays;
import 安卓.content.Context;
import 安卓.content.Intent;
import 安卓.support.v7.app.AppCompatActivity;
import 安卓.os.Bundle;
import 安卓.view.View;
import 安卓.widget.Button;
import 安卓.widget.Toast;
import java.util.ArrayList;
public class GameActivity extends AppCompatActivity implements View.OnClickListener {
private int i = 0;
private Thread t = new Thread();
private Button greenButton;
private Button redButton;
private Button blueButton;
private Button yellowButton;
private Button startButton;
private ArrayList<Integer> randomColors = new ArrayList<Integer>();
private ArrayList<Integer> userColors = new ArrayList<Integer>();
private GameManger gm;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
gm = new GameManger(this);
setContentView(R.layout.activity_game);
greenButton = (Button) findViewById(R.id.btnGreen);
redButton = (Button) findViewById(R.id.btnRed);
blueButton = (Button) findViewById(R.id.btnBlue);
yellowButton = (Button) findViewById(R.id.btnYellow);
startButton = (Button) findViewById(R.id.btnStart);
startButton.setOnClickListener(this);
greenButton.setOnClickListener(this);
redButton.setOnClickListener(this);
blueButton.setOnClickListener(this);
yellowButton.setOnClickListener(this);
}
@Override
public void onClick(View v) {
int num;
for (i=0;i<3;i++) {
num = gm.getColor(4);
randomColors.add(num);
}
安卓.os.Handler handler = new 安卓.os.Handler();
//TODO if the start button is pressed multiple times simultaneously it starts the lightup loop multiple times simultaneously
if (v.getId() == startButton.getId()) {
for (i = 0; i < randomColors.size(); i++) //light up loop
{
switch (randomColors.get(i)) {
case 1:
greenButton.setBackgroundResource(R.drawable.greenlightup);
handler.postDelayed(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
greenButton.setBackgroundResource(R.drawable.green);
}
}, 2000);
break;
case 2:
redButton.setBackgroundResource(R.drawable.redlightup);
handler.postDelayed(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
redButton.setBackgroundResource(R.drawable.red);
}
}, 2000);
break;
case 3:
blueButton.setBackgroundResource(R.drawable.bluelightup);
handler.postDelayed(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
blueButton.setBackgroundResource(R.drawable.blue);
}
}, 2000);
break;
case 4:
yellowButton.setBackgroundResource(R.drawable.yellowlightup);
handler.postDelayed(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
yellowButton.setBackgroundResource(R.drawable.yellow);
}
}, 2000);
break;
}
}
/*
for(i=0;i<randomColors.size();i++)
{
if(v.getId()==greenButton.getId())
{
userColors.add(1);
}
else
{
if(v.getId()==redButton.getId()){
userColors.add(2);
}
else
{
if(v.getId()==blueButton.getId())
{
userColors.add(3);
}
else
{
userColors.add(4);
}
}
}
}
for(i=0;i<randomColors.size();i++)
{
if(randomColors.get(i) != userColors.get(i))
{
Intent i = new Intent( GameActivity.this, GameOverActivity.class);
startActivity(i);
}
}
*/
}
}
}
这是java类：
package com.gabie212.simonsays;
import java.util.Random;
/**
* Created by Ronit on 21/02/2018.
*/
public class GameManger {
private GameActivity gActivity;
static Random rnd = new Random();
public GameManger(GameActivity mA)
{
this.gActivity =mA;
}
public int getColor(int size)
{
return rnd.nextInt(4)+1;
}
}
我遇到的问题是这一部分：
int num;
for (i=0;i<3;i++) {
num = gm.getColor(4);
randomColors.add(num);
}
安卓.os.Handler handler = new 安卓.os.Handler();
//TODO if the start button is pressed multiple times simultaneously it starts the lightup loop multiple times simultaneously
if (v.getId() == startButton.getId()) {
for (i = 0; i < randomColors.size(); i++) //light up loop
{
switch (randomColors.get(i)) {
case 1:
greenButton.setBackgroundResource(R.drawable.greenlightup);
handler.postDelayed(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
greenButton.setBackgroundResource(R.drawable.green);
}
}, 2000);
break;
case 2:
redButton.setBackgroundResource(R.drawable.redlightup);
handler.postDelayed(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
redButton.setBackgroundResource(R.drawable.red);
}
}, 2000);
break;
case 3:
blueButton.setBackgroundResource(R.drawable.bluelightup);
handler.postDelayed(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
blueButton.setBackgroundResource(R.drawable.blue);
}
}, 2000);
break;
case 4:
yellowButton.setBackgroundResource(R.drawable.yellowlightup);
handler.postDelayed(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
yellowButton.setBackgroundResource(R.drawable.yellow);
}
}, 2000);
break;
}
正如我提到的，它一次点亮4个按钮，而不是按顺序点亮，我使用的睡眠功能不起作用，我使用的延迟磨似乎也不起作用，我如何使它按顺序点亮颜色（我认为它使用睡眠功能，但我不确定）
# 1 楼答案
我认为问题在于，您要同时启动多个协程（在for循环中）。我猜您对Runnable接口不是很熟悉：每次运行Runnable时，它都与主进程并行运行，这意味着无论发生什么，代码都会继续运行
它运行
并设置一个计时器来运行延迟方法。但是当这个方法在等待时，等待循环继续进行
被执行等等。这就是为什么你的按钮（几乎）同时被涂上颜色。你延迟的方法几乎同时开火