Android的发展:"螺纹与未捕获的异常&QUOT退出; [英] Android Development: "thread exiting with uncaught exception"

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问题描述

我想创造我的第一个Android应用程序(游戏),但我有一些困难的开始。

当我运行我的code我得到这个错误日志:

 二月五日至25日:41:51.022:WARN / dalvikvm(634):主题ID = 1:螺纹退出与未捕获的异常(组= 0x4001d800)
2月5日至二十五日:41:51.040:ERROR / AndroidRuntime(634):致命异常:主要
2月5日至二十五日:41:51.040:ERROR / AndroidRuntime(634):java.lang.RuntimeException的:无法启动的活动ComponentInfo {com.stickfigs.nmg / com.stickfigs.nmg.NMG}:显示java.lang.NullPointerException
2月5日至二十五日:41:51.040:ERROR / AndroidRuntime(634):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
2月5日至二十五日:41:51.040:ERROR / AndroidRuntime(634):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
2月5日至二十五日:41:51.040:ERROR / AndroidRuntime(634):在android.app.ActivityThread.access $ 2300(ActivityThread.java:125)
2月5日至二十五日:41:51.040:ERROR / AndroidRuntime(634):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:2033)
2月5日至二十五日:41:51.040:ERROR / AndroidRuntime(634):在android.os.Handler.dispatchMessage(Handler.java:99)
2月5日至二十五日:41:51.040:ERROR / AndroidRuntime(634):在android.os.Looper.loop(Looper.java:123)
2月5日至二十五日:41:51.040:ERROR / AndroidRuntime(634):在android.app.ActivityThread.main(ActivityThread.java:4627)
2月5日至二十五日:41:51.040:ERROR / AndroidRuntime(634):在java.lang.reflect.Method.invokeNative(本机方法)
2月5日至二十五日:41:51.040:ERROR / AndroidRuntime(634):在java.lang.reflect.Method.invoke(Method.java:521)
2月5日至二十五日:41:51.040:ERROR / AndroidRuntime(634):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:868)
2月5日至二十五日:41:51.040:ERROR / AndroidRuntime(634):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
2月5日至二十五日:41:51.040:ERROR / AndroidRuntime(634):在dalvik.system.NativeStart.main(本机方法)
2月5日至二十五日:41:51.040:ERROR / AndroidRuntime(634):由:显示java.lang.NullPointerException
2月5日至二十五日:41:51.040:ERROR / AndroidRuntime(634):在com.stickfigs.nmg.NMG.onCreate(NMG.java:32)
2月5日至二十五日:41:51.040:ERROR / AndroidRuntime(634):在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
2月5日至二十五日:41:51.040:ERROR / AndroidRuntime(634):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
2月5日至二十五日:41:51.040:ERROR / AndroidRuntime(634):11 ...更多
2月5日至二十五日:41:51.062:WARN / ActivityManager(59):强制整理活动com.stickfigs.nmg / .NMG
 

我认为这个问题是这样的线程与未捕获的异常退出的一部分,我不知道是什么的例外可能是或什么导致它。

下面是我的code:

NMGView.java:     包com.stickfigs.NMG;

 进口android.content.Context;
进口android.os.Bundle;
进口android.util.AttributeSet;
进口android.view.SurfaceHolder;
进口android.view.SurfaceView;

类NMGView扩展了SurfaceView实现SurfaceHolder.Callback {

    类NMGThread继承Thread {
        //状态跟踪常数
        公共静态最终诠释STATE_LOSE = 1;
        公共静态最终诠释STATE_PAUSE = 2;
        公共静态最终诠释STATE_READY = 3;
        公共静态最终诠释STATE_RUNNING = 4;
        公共静态最终诠释STATE_WIN = 5;

        / **游戏的状态。一位准备,跑,暂停,输或赢* /
        私人诠释方式;

        / **句柄,我们与之交互的面管理器对象* /
        私人SurfaceHolder surfaceHolder;

        公共NMGThread(SurfaceHolder surfaceHolderc,上下文contextc){
            //获取句柄一些重要对象
            surfaceHolder = surfaceHolderc;
            上下文= contextc;

        }

        / **
         *恢复从指示捆绑游戏状态。通常情况下调用时
         *该项活动已经previously后恢复
         *销毁。
         *
         *参数savedState包包含了比赛状态
         * /
        市民同步无效restoreState(包savedState){
            同步(surfaceHolder){
                的setState(STATE_PAUSE);
                }
        }

        / **
         *设置游戏模式。也就是说,我们是否正在运行,暂停,在
         *故障状态,在胜利的状态,等等。
         *
         * @参数模式STATE_之一*常量
         * @参数消息字符串添加到屏幕或空
         * /
        公共无效的setState(INT MODEC){
            同步(surfaceHolder){
                模式= MODEC;
            }
        }
    }

    @覆盖
    公共无效surfaceChanged(SurfaceHolder持有人,INT格式,诠释的宽度,
            INT高度){
        // TODO自动生成方法存根

    }

    @覆盖
    公共无效surfaceCreated(SurfaceHolder持有者){
        // TODO自动生成方法存根

    }

    @覆盖
    公共无效surfaceDestroyed(SurfaceHolder持有者){
        // TODO自动生成方法存根

    }

    / **手柄的应用程序上下文,用于如获取可绘制。 * /
    私人上下文的背景下;

    / **实际绘制动画*线程/
    私人NMGThread线;

    公共NMGView(上下文的背景下,ATTRS的AttributeSet){
        超(背景下,ATTRS);

        //注册在听到关于改变我们的表面我们的利益
        SurfaceHolder支架= getHolder();
        holder.addCallback(本);

        //只有创建线程;它开始于surfaceCreated()
        线程=新NMGThread(架,背景);

        setFocusable(真正的); //确保我们获得的重要事件
    }

    / **
     *获取相应于该LunarView动画线程。
     *
     返回:动画线程
     * /
    公共NMGThread getThread(){
        返回线程;
    }
}
 

NMG.java:

 包com.stickfigs.nmg;

进口android.app.Activity;
进口android.os.Bundle;
进口android.util.Log;
进口android.view.Window;

进口com.stickfigs.nmg.NMGView.NMGThread;

公共类NMG延伸活动{
    / **第一次创建活动时调用。 * /

    / **的句柄实际上运行该动画的线程。 * /
    私人NMGThread nMGThread;

    / **手柄在其中游戏运行视图。 * /
    私人NMGView nMGView;

    @覆盖
    公共无效的onCreate(包savedInstanceState){
        super.onCreate(savedInstanceState);

        //关闭窗口的标题栏
        // TODO关闭状态栏
        requestWindowFeature(Window.FEATURE_NO_TITLE);

        //告诉系统来使用我们的XML文件中定义的布局
        的setContentView(R.layout.nmg_layout);

        //获取句柄LunarView从XML,它LunarThread
        nMGView =(NMGView)findViewById(R.id.nmg);
        nMGThread = nMGView.getThread();

        如果(savedInstanceState == NULL){
            //我们刚刚推出:成立一个新的游戏
            nMGThread.setState(NMGThread.STATE_READY);
            Log.w(this.getClass()的getName(),SIS为空);
        } 其他 {
            //我们正在恢复:恢复previous游戏
            nMGThread.restoreState(savedInstanceState);
            Log.w(this.getClass()的getName(),SIS为非空);
        }
    }
}
 

更新:这是我的R.java和nmg_layout.xml:

R.java:     包com.stickfigs.nmg;

 公共final类环R {
    公共静态final类ATTR {
    }
    公共静态final类绘制{
        公共静态最终诠释图标= 0x7f020000;
    }
    公共静态最后的类ID {
        公共静态最终诠释NMG = 0x7f050000;
    }
    公共静态最后的客舱布局{
        公共静态最终诠释nmg_layout = 0x7f030000;
    }
    公共静态final类的字符串{
        公共静态最终诠释APP_NAME = 0x7f040001;
        公共静态最终诠释你好= 0x7f040000;
    }
}
 

nmg_layout.xml:

 < XML版本=1.0编码=UTF-8&GT?;
<的FrameLayout的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
    机器人:layout_width =FILL_PARENT
    机器人:layout_height =FILL_PARENT>

    < com.stickfigs.nmg.NMGView
      机器人:ID =@ + ID / NMG
      机器人:layout_width =FILL_PARENT
      机器人:layout_height =FILL_PARENT/>
< /的FrameLayout>
 

解决方案

如果你通过堆栈跟踪,你会看到一个引发的......行(有时不止一个)。这些的最后一个是重要的。它说,有上NMG.java行32空指针异常。那行,并收到线,分别是:

  nMGView =(NMGView)findViewById(R.id.nmg);
nMGThread = nMGView.getThread();
 

显然,id为 R.id.nmg 无视图在布局 R.layout.nmg_layout 。那是什么导致你的问题。

I'm trying to create my first Android App (a game) but I'm having some difficulties getting started.

When I run my code I get this error log:

05-25 02:41:51.022: WARN/dalvikvm(634): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
05-25 02:41:51.040: ERROR/AndroidRuntime(634): FATAL EXCEPTION: main
05-25 02:41:51.040: ERROR/AndroidRuntime(634): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.stickfigs.nmg/com.stickfigs.nmg.NMG}: java.lang.NullPointerException
05-25 02:41:51.040: ERROR/AndroidRuntime(634):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
05-25 02:41:51.040: ERROR/AndroidRuntime(634):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
05-25 02:41:51.040: ERROR/AndroidRuntime(634):     at android.app.ActivityThread.access$2300(ActivityThread.java:125)
05-25 02:41:51.040: ERROR/AndroidRuntime(634):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
05-25 02:41:51.040: ERROR/AndroidRuntime(634):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-25 02:41:51.040: ERROR/AndroidRuntime(634):     at android.os.Looper.loop(Looper.java:123)
05-25 02:41:51.040: ERROR/AndroidRuntime(634):     at android.app.ActivityThread.main(ActivityThread.java:4627)
05-25 02:41:51.040: ERROR/AndroidRuntime(634):     at java.lang.reflect.Method.invokeNative(Native Method)
05-25 02:41:51.040: ERROR/AndroidRuntime(634):     at java.lang.reflect.Method.invoke(Method.java:521)
05-25 02:41:51.040: ERROR/AndroidRuntime(634):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
05-25 02:41:51.040: ERROR/AndroidRuntime(634):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
05-25 02:41:51.040: ERROR/AndroidRuntime(634):     at dalvik.system.NativeStart.main(Native Method)
05-25 02:41:51.040: ERROR/AndroidRuntime(634): Caused by: java.lang.NullPointerException
05-25 02:41:51.040: ERROR/AndroidRuntime(634):     at com.stickfigs.nmg.NMG.onCreate(NMG.java:32)
05-25 02:41:51.040: ERROR/AndroidRuntime(634):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
05-25 02:41:51.040: ERROR/AndroidRuntime(634):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
05-25 02:41:51.040: ERROR/AndroidRuntime(634):     ... 11 more
05-25 02:41:51.062: WARN/ActivityManager(59):   Force finishing activity com.stickfigs.nmg/.NMG

I think the problem is this "thread exiting with uncaught exception" part, I have no idea what the exception could be or what's causing it.

Here is my code:

NMGView.java: package com.stickfigs.NMG;

import android.content.Context;
import android.os.Bundle;
import android.util.AttributeSet;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

class NMGView extends SurfaceView implements SurfaceHolder.Callback {

    class NMGThread extends Thread {
        //State-tracking constants
        public static final int STATE_LOSE = 1;
        public static final int STATE_PAUSE = 2;
        public static final int STATE_READY = 3;
        public static final int STATE_RUNNING = 4;
        public static final int STATE_WIN = 5;

        /** The state of the game. One of READY, RUNNING, PAUSE, LOSE, or WIN */
        private int mode;

        /** Handle to the surface manager object we interact with */
        private SurfaceHolder surfaceHolder;

        public NMGThread(SurfaceHolder surfaceHolderc, Context contextc) {
            // get handles to some important objects
            surfaceHolder = surfaceHolderc;
            context = contextc;

        }

        /**
         * Restores game state from the indicated Bundle. Typically called when
         * the Activity is being restored after having been previously
         * destroyed.
         * 
         * @param savedState Bundle containing the game state
         */
        public synchronized void restoreState(Bundle savedState) {
            synchronized (surfaceHolder) {
                setState(STATE_PAUSE);
                }
        }

        /**
         * Sets the game mode. That is, whether we are running, paused, in the
         * failure state, in the victory state, etc.
         * 
         * @param mode one of the STATE_* constants
         * @param message string to add to screen or null
         */
        public void setState(int modec) {
            synchronized (surfaceHolder) {
                mode = modec;
            }
        }
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width,
            int height) {
        // TODO Auto-generated method stub

    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        // TODO Auto-generated method stub

    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        // TODO Auto-generated method stub

    }

    /** Handle to the application context, used to e.g. fetch Drawables. */
    private Context context;

    /** The thread that actually draws the animation */
    private NMGThread thread;

    public NMGView(Context context, AttributeSet attrs) {
        super(context, attrs);

        // register our interest in hearing about changes to our surface
        SurfaceHolder holder = getHolder();
        holder.addCallback(this);

        // create thread only; it's started in surfaceCreated()
        thread = new NMGThread(holder, context);

        setFocusable(true); // make sure we get key events
    }

    /**
     * Fetches the animation thread corresponding to this LunarView.
     * 
     * @return the animation thread
     */
    public NMGThread getThread() {
        return thread;
    }
}

NMG.java:

package com.stickfigs.nmg;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Window;

import com.stickfigs.nmg.NMGView.NMGThread;

public class NMG extends Activity {
    /** Called when the activity is first created. */

    /** A handle to the thread that's actually running the animation. */
    private NMGThread nMGThread;

    /** A handle to the View in which the game is running. */
    private NMGView nMGView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        //Turn off the window's title bar
        // TODO Turn off the status bar
        requestWindowFeature(Window.FEATURE_NO_TITLE);

        // tell system to use the layout defined in our XML file
        setContentView(R.layout.nmg_layout);

        // get handles to the LunarView from XML, and its LunarThread
        nMGView = (NMGView) findViewById(R.id.nmg);
        nMGThread = nMGView.getThread();

        if (savedInstanceState == null) {
            // we were just launched: set up a new game
            nMGThread.setState(NMGThread.STATE_READY);
            Log.w(this.getClass().getName(), "SIS is null");
        } else {
            // we are being restored: resume a previous game
            nMGThread.restoreState(savedInstanceState);
            Log.w(this.getClass().getName(), "SIS is nonnull");
        }
    }
}

UPDATE: Here is my R.java and nmg_layout.xml:

R.java: package com.stickfigs.nmg;

public final class R {
    public static final class attr {
    }
    public static final class drawable {
        public static final int icon=0x7f020000;
    }
    public static final class id {
        public static final int nmg=0x7f050000;
    }
    public static final class layout {
        public static final int nmg_layout=0x7f030000;
    }
    public static final class string {
        public static final int app_name=0x7f040001;
        public static final int hello=0x7f040000;
    }
}

nmg_layout.xml:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <com.stickfigs.nmg.NMGView
      android:id="@+id/nmg"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"/>
</FrameLayout>

解决方案

If you look through the stack trace, you will see a "Caused by..." line (sometimes more than one). The last one of those is the important one. It says that there was a null pointer exception on line 32 of NMG.java. That line, and the line before it, are:

nMGView = (NMGView) findViewById(R.id.nmg);
nMGThread = nMGView.getThread();

Evidently, no view with id R.id.nmg is in layout R.layout.nmg_layout. That's what's causing your problem.

这篇关于Android的发展:&QUOT;螺纹与未捕获的异常&QUOT退出;的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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