为什么我的Android应用程序崩溃？

当我调试我的应用程序时，它崩溃了。 我收到消息“不幸的是XXX已停止错误”。 应用程序正在从SD读取文件

这是Logcat消息：

01-15 22:08:49.878  20190-20190/com.example.ReadFile I/System.out﹕ debugger has settled (1378)
01-15 22:08:49.962  20190-20209/com.example.ReadFile D/OpenGLRenderer﹕ Render dirty regions requested: true
01-15 22:08:49.966  20190-20190/com.example.ReadFile D/Atlas﹕ Validating map...
01-15 22:08:50.046  20190-20209/com.example.ReadFile I/OpenGLRenderer﹕ Initialized EGL, version 1.4
01-15 22:08:50.068  20190-20209/com.example.ReadFile D/OpenGLRenderer﹕ Enabling debug mode 0
01-15 22:08:50.070  20190-20209/com.example.ReadFile D/mali_winsys﹕ new_window_surface returns 0x3000
01-15 22:08:58.528  20190-20190/com.example.ReadFile I/Choreographer﹕ Skipped 129 frames!  The application may be doing too much work on its main thread.
01-15 22:09:11.207  20190-20198/com.example.ReadFile A/libc﹕ Fatal signal 11 (SIGSEGV), code 1, fault addr 0xdead1234 in tid 20198 (JDWP)

代码如下：

这是一项活动：

public class MyActivity extends Activity {

    private UdpClient mUdpClient;
    private TextView txtTest;
    private Button btnDisconnect;
    private Button btnConnect;

    /**
     * Called when the activity is first created.
     */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        txtTest = (TextView)findViewById(R.id.txtTest);
        btnConnect = (Button)findViewById(R.id.btnConnect);

        btnConnect.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                ConnectToServer();
            }
        });
    }

    private void ConnectToServer() {
        new ConnectTask().execute("");
    }
    public class ConnectTask extends AsyncTask<String, Bitmap, UdpClient> {
        @Override
        protected UdpClient doInBackground(String... message) {

            mUdpClient = new UdpClient(getApplicationContext());
            mUdpClient.run();
            return null;
        }

        @Override
        protected void onProgressUpdate(Bitmap... bitmap){
            super.onProgressUpdate(bitmap);
        }
    }
}

---

一旦我读取文件，程序就会崩溃。

在我看来，主CPU工作过度，换句话说，这是一个资源密集型的问题，例如，当一个文件停止响应并在windows中崩溃时，这基本上是一样的，试着优化它或分散线程。

Log说mUdpClient是空的。 在调用AsyncTask之前尝试初始化mUdpClient：

mUdpClient=新的UdpClient（getApplicationContext（））

---

还可以尝试将mUdpClient公开。

但这就是我正在做的。我正在使用AsyncTask调用serverpost崩溃的stacktrace。stacktrace在哪里？它在控制台中打印，没有stacktrace，我们是盲的！。如果您对这一行添加注释

ConnectToServer（）退出，然后再次运行应用程序？它位于扩展线程上。我正在读取的文件小于1MB。它们是文本文件，如果不是太多，你能上传apk到drop box并发布链接让我看一下吗？这是一个apk的链接：你使用的是哪个版本的SDK，目标是哪个版本？SDK-Android API 21，这是我在清单文件中的内容：所以AsyncTasks的缺点是它们不支持上下文更改（屏幕旋转和其他类似更改）。能否再次运行应用程序并确保旋转已关闭。在调用mUdpClient.run（）之前，是否可以添加断点以查看mUdpClient是否为null；
public class UdpClient {
    public static Context ctx;


    public UdpClient(Context context) {
        ctx = context;
    }

    public void run()
    {
        int valueIndex = R.raw.image_nearest;
        int imageXYs = R.raw.image_xy;

        String[] strNearestValue = this.ReadValueFile(valueIndex);
        String[] imageXY = ReadValueFile(imageXYs);

        int []nearestValue = new int[strNearestValue.length];

        int numOfPixel = imageXY.length;
        int []pixels = new int[numOfPixel];

        for(int i=0;i<imageXY.length;i++)
        {
            nearestValue[i] = Integer.parseInt(strNearestValue[i]);
            pixels[i]=GetXY(imageXY[i]);
        }
    }

    public static int GetXY(String xyRaw) {
        String[] xy = xyRaw.split(",");
        short xPixel = Short.parseShort(xy[0]);
        short yPixel = Short.parseShort(xy[1]);
        int pixelIndex = 800 * (yPixel - 1) + xPixel - 1;
        return pixelIndex;
    }


    private String[] ReadValueFile(int fileResourceID) {
        List<String> list = new ArrayList<String>();
        try(InputStream inputStream = ctx.getResources().openRawResource(fileResourceID);){
            try(BufferedReader br= new BufferedReader(new InputStreamReader(inputStream)))
            {
                String line;
                while ((line = br.readLine()) != null) {
                    list.add(line);
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return list.toArray(new String[list.size()]);
    }
}

01-15 22:02:00.884  19747-19847/? E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #1
    Process: com.example.ReadFile, PID: 19747
    java.lang.RuntimeException: An error occured while executing doInBackground()
            at android.os.AsyncTask$3.done(AsyncTask.java:300)
            at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
            at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
            at java.util.concurrent.FutureTask.run(FutureTask.java:242)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:818)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.example.ReadFile.UdpClient.run()' on a null object reference
            at com.example.ReadFile.MyActivity$ConnectTask.doInBackground(MyActivity.java:55)
            at com.example.ReadFile.MyActivity$ConnectTask.doInBackground(MyActivity.java:51)
            at android.os.AsyncTask$2.call(AsyncTask.java:288)
            at java.util.concurrent.FutureTask.run(FutureTask.java:237)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:818)
01-15 22:02:37.108  19870-19901/? E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #1
    Process: com.example.ReadFile, PID: 19870
    java.lang.RuntimeException: An error occured while executing doInBackground()
            at android.os.AsyncTask$3.done(AsyncTask.java:300)
            at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
            at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
            at java.util.concurrent.FutureTask.run(FutureTask.java:242)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:818)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.example.ReadFile.UdpClient.run()' on a null object reference
            at com.example.ReadFile.MyActivity$ConnectTask.doInBackground(MyActivity.java:55)
            at com.example.ReadFile.MyActivity$ConnectTask.doInBackground(MyActivity.java:51)
            at android.os.AsyncTask$2.call(AsyncTask.java:288)
            at java.util.concurrent.FutureTask.run(FutureTask.java:237)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:818)
01-15 22:08:16.826      399-442/? E/InputDispatcher﹕ channel '2f43cf57 com.example.ReadFile/com.example.ReadFile.MyActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
01-15 22:35:42.096      399-442/? E/InputDispatcher﹕ channel '23d7860 com.example.ReadFile/com.example.ReadFile.MyActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
01-15 22:58:22.366      399-442/? E/InputDispatcher﹕ channel '14d3e113 com.example.ReadFile/com.example.ReadFile.MyActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
01-15 23:02:44.483  21264-21272/com.example.ReadFile A/libc﹕ Fatal signal 11 (SIGSEGV), code 1, fault addr 0xdead1234 in tid 21272 (JDWP)
01-15 23:02:45.046      399-442/? E/InputDispatcher﹕ channel '16edc311 com.example.ReadFile/com.example.ReadFile.MyActivity (server)' ~ Channel is unrecoverably broken and will be disposed!