调用onCreate（）后，屏幕变黑

Question

调用onCreate（）方法后，我的模拟器和手机的屏幕变黑，之后的代码无法启动。它不会抛出任何错误，只是在OnCcreate方法的最后一行停止。我认为它在Actvity.java文件中停止。 log cat

02-10 14:00:08.660    2794-2794/com.flashcards.flashcards D/﹕ HostConnection::get() New Host Connection established 0x7ff02f1974a0, tid 2794
02-10 14:00:08.670    2794-2794/com.flashcards.flashcards D/Atlas﹕ Validating map...
02-10 14:00:08.710    2794-2813/com.flashcards.flashcards D/﹕ HostConnection::get() New Host Connection established 0x7ff02f197de0, tid 2813
02-10 14:00:08.740    2794-2813/com.flashcards.flashcards I/OpenGLRenderer﹕ Initialized EGL, version 1.4
02-10 14:00:08.780    2794-2813/com.flashcards.flashcards D/OpenGLRenderer﹕ Enabling debug mode 0
02-10 14:00:08.800    2794-2813/com.flashcards.flashcards W/EGL_emulation﹕ eglSurfaceAttrib not implemented
02-10 14:00:08.800    2794-2813/com.flashcards.flashcards W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0x7ff0398bed00, error=EGL_SUCCESS
02-10 14:00:10.030    2794-2813/com.flashcards.flashcards W/EGL_emulation﹕ eglSurfaceAttrib not implemented
02-10 14:00:10.030    2794-2813/com.flashcards.flashcards W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0x7ff02e6fa940, error=EGL_SUCCESS
02-10 14:00:10.260    2794-2813/com.flashcards.flashcards D/OpenGLRenderer﹕ endAllStagingAnimators on 0x7ff036d8dc00 (RippleDrawable) with handle     0x7ff02f1c15c0

有问题的方法

 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_card_question);
    try {
        FileInputStream fis = openFileInput("correct2.txt");
        //InputStreamReader isr = new InputStreamReader(fIn);
        StringBuffer sb = new StringBuffer();
        BufferedReader br = new BufferedReader(new InputStreamReader(fis));
        String strLine = null;
        int x = 0;


        while ((strLine = br.readLine()) != null) {
            arrayCorrect[x] = strLine;
            x++;

        }
        if(x>0&&arrayCorrect[x-1]!=null) {
            if (arrayCorrect[x - 1].equals("null") || arrayCorrect[x - 1].equals("")) {
                errorInTranscription();
            }
        }


        //Log.i("File Reading stuff", "success = " + "hell");

    } catch (IOException ioe) {//ioe.printStackTrace();
    }
    try {
        FileInputStream fis = openFileInput("incorrect2.txt");
        //InputStreamReader isr = new InputStreamReader(fIn);
        StringBuffer sb = new StringBuffer();
        BufferedReader br = new BufferedReader(new InputStreamReader(fis));
        String strLine = null;
        int x = 0;


        while ((strLine = br.readLine()) != null) {
            arrayIncorrect[x] = strLine;
            x++;

        }
        if(x>0&&arrayIncorrect[x-1]!=null) {
        if(arrayIncorrect[x].equals("null")||arrayIncorrect[x].equals("")){
            errorInTranscription();
        }}




    } catch (IOException ioe) {//ioe.printStackTrace();
    }
    int a=1;
}

它到达终点（int a = 1），但它只是停留在最后一个parathesis