Android应用程序意外停止

Question

当我尝试运行我的应用程序以查看它是否有效时，它崩溃并且只是说它停止工作。我的应用程序旨在检查当前的日期和时间，然后检查计划（数组），然后将文本字段更改为下一个渡轮的时间。至于我检查代码将做我想做的事情（我不知道肯定）。反正这是会话日志：

05-02 21:09:20.350: D/AndroidRuntime(935): Shutting down VM 
05-02 21:09:20.350: W/dalvikvm(935): threadid=1: thread exiting with uncaught exception (group=0xb4a85ba8) 
05-02 21:09:20.370: E/AndroidRuntime(935): FATAL EXCEPTION: main 
05-02 21:09:20.370: E/AndroidRuntime(935): Process: sep.justin.statenislandferry, PID: 935 
05-02 21:09:20.370: E/AndroidRuntime(935): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{sep.justin.statenislandferry/com.example.statenislandferry.MainActivity}: java.lang.NullPointerException 
05-02 21:09:20.370: E/AndroidRuntime(935):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2121) 
05-02 21:09:20.370: E/AndroidRuntime(935):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245) 
05-02 21:09:20.370: E/AndroidRuntime(935):  at android.app.ActivityThread.access$800(ActivityThread.java:135) 
05-02 21:09:20.370: E/AndroidRuntime(935):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 
05-02 21:09:20.370: E/AndroidRuntime(935):  at android.os.Handler.dispatchMessage(Handler.java:102) 
05-02 21:09:20.370: E/AndroidRuntime(935):  at android.os.Looper.loop(Looper.java:136) 
05-02 21:09:20.370: E/AndroidRuntime(935):  at android.app.ActivityThread.main(ActivityThread.java:5017) 
05-02 21:09:20.370: E/AndroidRuntime(935):  at java.lang.reflect.Method.invokeNative(Native Method) 
05-02 21:09:20.370: E/AndroidRuntime(935):  at java.lang.reflect.Method.invoke(Method.java:515) 
05-02 21:09:20.370: E/AndroidRuntime(935):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
05-02 21:09:20.370: E/AndroidRuntime(935):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
05-02 21:09:20.370: E/AndroidRuntime(935):  at dalvik.system.NativeStart.main(Native Method) 
05-02 21:09:20.370: E/AndroidRuntime(935): Caused by: java.lang.NullPointerException 
05-02 21:09:20.370: E/AndroidRuntime(935):  at android.app.Activity.findViewById(Activity.java:1884) 
05-02 21:09:20.370: E/AndroidRuntime(935):  at com.example.statenislandferry.MainActivity.<init>(MainActivity.java:22) 
05-02 21:09:20.370: E/AndroidRuntime(935):  at java.lang.Class.newInstanceImpl(Native Method) 
05-02 21:09:20.370: E/AndroidRuntime(935):  at java.lang.Class.newInstance(Class.java:1208) 
05-02 21:09:20.370: E/AndroidRuntime(935):  at android.app.Instrumentation.newActivity(Instrumentation.java:1061) 
05-02 21:09:20.370: E/AndroidRuntime(935):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2112) 
05-02 21:09:20.370: E/AndroidRuntime(935):  ... 11 more 

更新：

05-02 22:05:02.090: W/ResourceType(824): No package identifier when getting value for resource number 0x00000406 
05-02 22:05:02.090: D/AndroidRuntime(824): Shutting down VM 
05-02 22:05:02.100: W/dalvikvm(824): threadid=1: thread exiting with uncaught exception (group=0xb4a2dba8) 
05-02 22:05:02.110: E/AndroidRuntime(824): FATAL EXCEPTION: main 
05-02 22:05:02.110: E/AndroidRuntime(824): Process: sep.justin.statenislandferry, PID: 824 
05-02 22:05:02.110: E/AndroidRuntime(824): java.lang.RuntimeException: Unable to start activity ComponentInfo{sep.justin.statenislandferry/com.example.statenislandferry.MainActivity}: android.content.res.Resources$NotFoundException: String resource ID #0x406 
05-02 22:05:02.110: E/AndroidRuntime(824):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195) 
05-02 22:05:02.110: E/AndroidRuntime(824):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245) 
05-02 22:05:02.110: E/AndroidRuntime(824):  at android.app.ActivityThread.access$800(ActivityThread.java:135) 
05-02 22:05:02.110: E/AndroidRuntime(824):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 
05-02 22:05:02.110: E/AndroidRuntime(824):  at android.os.Handler.dispatchMessage(Handler.java:102) 
05-02 22:05:02.110: E/AndroidRuntime(824):  at android.os.Looper.loop(Looper.java:136) 
05-02 22:05:02.110: E/AndroidRuntime(824):  at android.app.ActivityThread.main(ActivityThread.java:5017) 
05-02 22:05:02.110: E/AndroidRuntime(824):  at java.lang.reflect.Method.invokeNative(Native Method) 
05-02 22:05:02.110: E/AndroidRuntime(824):  at java.lang.reflect.Method.invoke(Method.java:515) 
05-02 22:05:02.110: E/AndroidRuntime(824):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
05-02 22:05:02.110: E/AndroidRuntime(824):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
05-02 22:05:02.110: E/AndroidRuntime(824):  at dalvik.system.NativeStart.main(Native Method) 
05-02 22:05:02.110: E/AndroidRuntime(824): Caused by: android.content.res.Resources$NotFoundException: String resource ID #0x406 
05-02 22:05:02.110: E/AndroidRuntime(824):  at android.content.res.Resources.getText(Resources.java:244) 
05-02 22:05:02.110: E/AndroidRuntime(824):  at android.widget.TextView.setText(TextView.java:3888) 
05-02 22:05:02.110: E/AndroidRuntime(824):  at com.example.statenislandferry.MainActivity.onCreate(MainActivity.java:18) 
05-02 22:05:02.110: E/AndroidRuntime(824):  at android.app.Activity.performCreate(Activity.java:5231) 
05-02 22:05:02.110: E/AndroidRuntime(824):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
05-02 22:05:02.110: E/AndroidRuntime(824):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159) 
05-02 22:05:02.110: E/AndroidRuntime(824):  ... 11 more 
05-02 22:05:06.750: I/Process(824): Sending signal. PID: 824 SIG: 9 

这是代码：

public class MainActivity extends Activity { 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    TextView ferryTime = (TextView)findViewById(R.id.ferrytime); 
    ferryTime.setText(convert()); 
} 
static int[] satTimes = new int[] {10,50}; 
static int[] sunTimes = new int[] {10,50}; 
static int[] weekTimes = new int[] {0,30,100,200,300,400,500,530,600,620,640,700,715,730,745,800,815,830,845,900,930,1000,1030,1100,1130,1200,1230,1300,1330,1400,1430,1500,1530,1550,1610,1630,1650,1710,1730,1745,1800,1815,1830,1845,1900,1930,2000,2030,2100,2130,2200,2230,2300,2330}; 

static Calendar rightNow = Calendar.getInstance(); 

public static String checkdate(){ 

    if(rightNow.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY){ 
     return "saturday"; 
    }else if (rightNow.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY){ 
     return "sunday"; 
    } else { 
     return "weekday"; 
    } 
} 

public static int getTime(){ 
    int time = rightNow.get(Calendar.HOUR_OF_DAY) * 100; 
    time = time + rightNow.get(Calendar.MINUTE); 
    return time; 
} 

public static int checkTime(){ 
    String today = checkdate(); 

    if (today == "saturday"){ 
     for(int i = 1; i <= satTimes.length; i ++){ 
      if(satTimes[i] > getTime()){ 
       return satTimes[i]; 
      } 
     } 
    } else if (today == "sunday"){ 
     for(int i = 1; i <= sunTimes.length; i ++){ 
      if(sunTimes[i] > getTime()){ 
       return sunTimes[i]; 
      } 
     }   
    } else if (today == "weekday") { 
     for(int i = 1; i <= weekTimes.length; i ++){ 
      if(weekTimes[i] > getTime()){ 
       return weekTimes[i]; 
      } 

     }   
    } 
    return 0; 
} 

public static int timeLeft(){ 
    int actualTime = getTime(); 
    int ferryTime = checkTime(); 
    return actualTime - ferryTime; 
} 

public static int convert(){ 
    int ferrytime = checkTime(); 
    if (ferrytime > 1200){ 
     return ferrytime - 1200; 
    }else{ 
     return ferrytime; 
    } 
} 
} 

编辑：我已经固定的位置后，更新了log初始化TextView ferrytime。

Answer 1

您正在初始化TextView ferryTime以外的onCreate方法。当您致电ferryTime.setText()时，您将获得NullPointerException。其移动到onCreate这样的：

protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    TextView ferryTime = (TextView)findViewById(R.id.ferrytime); 
    ferryTime.setText(convert()); 
} 

的[上的NullPointerException findViewById（）在机器人]