更改背景颜色崩溃应用

时间：2017-07-28 08:06:46

标签： java android

这个功能正在崩溃我的应用程序，我不知道为什么。 

    public void whileLoopForChange(){
    while (gameRunning = true){
        View someView = findViewById(R.id.screen);
        final View root = someView.getRootView();
        Random rand = new Random();
        final int value = rand.nextInt(15);
        if(lvl<10){
            new Timer().schedule(new TimerTask() {
                @Override
                public void run() {
                    if(value == 1){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Red));
                        currentColor = "red";
                    }else if(value == 2){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Pink));
                        currentColor = "pink";
                    }else if(value == 3){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Orange));
                        currentColor = "orange";
                    }else if(value == 4){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Blue));
                        currentColor = "blue";
                    }else if(value == 5){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Green));
                        currentColor = "green";
                    }else if(value == 6){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.White));
                        currentColor = "white";
                    }else if(value == 7){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Black));
                        currentColor = "black";
                    }else if(value == 8){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Salmon));
                        currentColor = "salmon";
                    }else if(value == 9){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Violet));
                        currentColor = "violet";
                    }else if(value == 10){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Cyan));
                        currentColor = "cyan";
                    }else if(value == 11){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.DarkGray));
                        currentColor = "darkgray";
                    }else if(value == 12){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Gray));
                        currentColor = "gray";
                    }else if(value == 13){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Chocolate));
                        currentColor = "chocolate";
                    }else if(value == 14){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Silver));
                        currentColor = "silver";
                    }
                }
            }, 1000);
        }else if(lvl<15 && lvl>9) {
            new Timer().schedule(new TimerTask() {
                @Override
                public void run() {
                    if(value == 1){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Red));
                        currentColor = "red";
                    }else if(value == 2){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Pink));
                        currentColor = "pink";
                    }else if(value == 3){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Orange));
                        currentColor = "orange";
                    }else if(value == 4){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Blue));
                        currentColor = "blue";
                    }else if(value == 5){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Green));
                        currentColor = "green";
                    }else if(value == 6){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.White));
                        currentColor = "white";
                    }else if(value == 7){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Black));
                        currentColor = "black";
                    }else if(value == 8){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Salmon));
                        currentColor = "salmon";
                    }else if(value == 9){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Violet));
                        currentColor = "violet";
                    }else if(value == 10){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Cyan));
                        currentColor = "cyan";
                    }else if(value == 11){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.DarkGray));
                        currentColor = "darkgray";
                    }else if(value == 12){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Gray));
                        currentColor = "gray";
                    }else if(value == 13){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Chocolate));
                        currentColor = "chocolate";
                    }else if(value == 14){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Silver));
                        currentColor = "silver";
                    }
                }
            }, 750);
        }else if(lvl<20 && lvl>14){
            new Timer().schedule(new TimerTask() {
                @Override
                public void run() {
                    if(value == 1){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Red));
                        currentColor = "red";
                    }else if(value == 2){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Pink));
                        currentColor = "pink";
                    }else if(value == 3){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Orange));
                        currentColor = "orange";
                    }else if(value == 4){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Blue));
                        currentColor = "blue";
                    }else if(value == 5){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Green));
                        currentColor = "green";
                    }else if(value == 6){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.White));
                        currentColor = "white";
                    }else if(value == 7){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Black));
                        currentColor = "black";
                    }else if(value == 8){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Salmon));
                        currentColor = "salmon";
                    }else if(value == 9){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Violet));
                        currentColor = "violet";
                    }else if(value == 10){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Cyan));
                        currentColor = "cyan";
                    }else if(value == 11){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.DarkGray));
                        currentColor = "darkgray";
                    }else if(value == 12){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Gray));
                        currentColor = "gray";
                    }else if(value == 13){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Chocolate));
                        currentColor = "chocolate";
                    }else if(value == 14){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Silver));
                        currentColor = "silver";
                    }
                }
            }, 600);
        }else if(lvl<30 && lvl>19){
            new Timer().schedule(new TimerTask() {
                @Override
                public void run() {
                    if(value == 1){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Red));
                        currentColor = "red";
                    }else if(value == 2){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Pink));
                        currentColor = "pink";
                    }else if(value == 3){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Orange));
                        currentColor = "orange";
                    }else if(value == 4){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Blue));
                        currentColor = "blue";
                    }else if(value == 5){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Green));
                        currentColor = "green";
                    }else if(value == 6){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.White));
                        currentColor = "white";
                    }else if(value == 7){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Black));
                        currentColor = "black";
                    }else if(value == 8){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Salmon));
                        currentColor = "salmon";
                    }else if(value == 9){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Violet));
                        currentColor = "violet";
                    }else if(value == 10){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Cyan));
                        currentColor = "cyan";
                    }else if(value == 11){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.DarkGray));
                        currentColor = "darkgray";
                    }else if(value == 12){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Gray));
                        currentColor = "gray";
                    }else if(value == 13){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Chocolate));
                        currentColor = "chocolate";
                    }else if(value == 14){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Silver));
                        currentColor = "silver";
                    }
                }
            }, 550);
        }else if(lvl<50 && lvl>29){
            new Timer().schedule(new TimerTask() {
                @Override
                public void run() {
                    if(value == 1){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Red));
                        currentColor = "red";
                    }else if(value == 2){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Pink));
                        currentColor = "pink";
                    }else if(value == 3){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Orange));
                        currentColor = "orange";
                    }else if(value == 4){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Blue));
                        currentColor = "blue";
                    }else if(value == 5){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Green));
                        currentColor = "green";
                    }else if(value == 6){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.White));
                        currentColor = "white";
                    }else if(value == 7){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Black));
                        currentColor = "black";
                    }else if(value == 8){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Salmon));
                        currentColor = "salmon";
                    }else if(value == 9){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Violet));
                        currentColor = "violet";
                    }else if(value == 10){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Cyan));
                        currentColor = "cyan";
                    }else if(value == 11){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.DarkGray));
                        currentColor = "darkgray";
                    }else if(value == 12){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Gray));
                        currentColor = "gray";
                    }else if(value == 13){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Chocolate));
                        currentColor = "chocolate";
                    }else if(value == 14){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Silver));
                        currentColor = "silver";
                    }
                }
            }, 500);
        }else if(lvl<49){
            new Timer().schedule(new TimerTask() {
                @Override
                public void run() {
                    if(value == 1){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Red));
                        currentColor = "red";
                    }else if(value == 2){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Pink));
                        currentColor = "pink";
                    }else if(value == 3){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Orange));
                        currentColor = "orange";
                    }else if(value == 4){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Blue));
                        currentColor = "blue";
                    }else if(value == 5){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Green));
                        currentColor = "green";
                    }else if(value == 6){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.White));
                        currentColor = "white";
                    }else if(value == 7){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Black));
                        currentColor = "black";
                    }else if(value == 8){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Salmon));
                        currentColor = "salmon";
                    }else if(value == 9){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Violet));
                        currentColor = "violet";
                    }else if(value == 10){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Cyan));
                        currentColor = "cyan";
                    }else if(value == 11){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.DarkGray));
                        currentColor = "darkgray";
                    }else if(value == 12){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Gray));
                        currentColor = "gray";
                    }else if(value == 13){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Chocolate));
                        currentColor = "chocolate";
                    }else if(value == 14){
                        root.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.Silver));
                        currentColor = "silver";
                    }
                }
            }, 350);
        }
    }

当我删除该功能并调用它时，该应用程序运行正常。 我是新手Android但有java经验。 在默认情况下在该方法中出现的所有内容之后，对onCreate方法的调用。 我没有在布局xml文件中放任何东西，除了onCreate在我的主要活动中我没有其他功能。

编辑1：删除计时器会使应用程序崩溃。如何将代码函数替换为使代码运行一段时间的东西？

编辑2： Logcat：---------崩溃的开始 07-28 15：15：37.259 32203-32203 /？ E / AndroidRuntime：致命异常：主要                                                    过程：io.eliot.colorstop，PID：32203                                                    java.lang.RuntimeException：无法启动活动ComponentInfo {io.eliot.colorstop / io.eliot.colorstop.MainActivity}：java.lang.NullPointerException：尝试调用虚拟方法'android.view.View android.view.View。对空引用引用的getRootView（）'                                                        在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2984）                                                        在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:3045）                                                        在android.app.ActivityThread.-wrap14（ActivityThread.java）                                                        在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1642）                                                        在android.os.Handler.dispatchMessage（Handler.java:102）                                                        在android.os.Looper.loop（Looper.java:154）                                                        在android.app.ActivityThread.main（ActivityThread.java:6776）                                                        at java.lang.reflect.Method.invoke（Native Method）                                                        在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:1520）                                                        在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:1410）                                                     引起：java.lang.NullPointerException：尝试在空对象引用上调用虚方法'android.view.View android.view.View.getRootView（）'                                                        at io.eliot.colorstop.MainActivity.whileLoopF​​orChange（MainActivity.java:34）                                                        在io.eliot.colorstop.MainActivity.onCreate（MainActivity.java:29）                                                        在android.app.Activity.performCreate（Activity.java:6955）                                                        在android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1126）                                                        在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2927）                                                        在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:3045）                                                        在android.app.ActivityThread.-wrap14（ActivityThread.java）                                                        在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1642）                                                        在android.os.Handler.dispatchMessage（Handler.java:102）                                                        在android.os.Looper.loop（Looper.java:154）                                                        在android.app.ActivityThread.main（ActivityThread.java:6776）                                                        at java.lang.reflect.Method.invoke（Native Method）                                                        在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:1520）                                                        在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:1410）

在阅读logcat之后，似乎它获得了崩溃它的根视图。

1 个答案:

答案 0 :(得分：2)

Timer在新线程中运行代码。使用runOnUiThread函数

runOnUiThread(new Runnable() {

                    @Override
                    public void run() {
                        //Your code here.
                    }
                });
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