在android上發生崩潰

我的所有代碼都正常工作，直到我試圖添加日期。當我這樣做時，應用程序在啓動時崩潰。以下是我迄今爲止：在android上發生崩潰

activity_main.xml中：

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

<!-- Header --> 



<TextView 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:background="#000000" 
    android:textColor="#FFFFFF" 
    android:gravity="center" 
    android:layout_marginTop="20dp" 
    android:id="@+id/Header" 
    android:text="" 
/> 

<!-- Name --> 

<TextView 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:layout_marginLeft="50dp" 
    android:id="@+id/Name" 
    android:text="" 
/> 

<!-- Project Name --> 

<TextView 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:layout_marginLeft="50dp" 
    android:id="@+id/ProjectName" 
    android:text=""  
/> 

<!-- Digital Clock --> 

<DigitalClock 
    android:id="@+id/DigitalClock" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_marginLeft="50dp" 
    android:text="" 
/> 

<!-- Calendar --> 

<TextView 
    android:id="@+id/stringCalendar" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_marginLeft="50dp" 
    android:text="" 
/> 

<!-- End of Program --> 

<TextView 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:textColor="#FFFFFF" 
    android:background="#000000" 
    android:gravity="center" 
    android:id="@+id/EndOfProgram" 
    android:text="" 
/> 

</LinearLayout>

MainActivity.java：

package com.example.d1project1; 

import java.util.Calendar; 

import android.os.Bundle; 
import android.app.Activity; 
import android.widget.DigitalClock; 

import android.widget.TextView; 

@SuppressWarnings({ "deprecation", "unused" }) 
public class MainActivity extends Activity { 
    //Declare GUI objects 

    TextView stringHeader; 
    TextView stringName;   
    TextView stringProject; 
    TextView digitalClock1; 
    TextView stringEnd; 

    TextView stringCalendar; 
    TextView stringDisplay; 
    DigitalClock DigitalClock; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     Init_GUI(); 
     DigitalClock(); 
     Nonevent_Event(); 
    } 

    private void DigitalClock() { 
     //DigitalClock 
     DigitalClock = (DigitalClock)findViewById(R.id.DigitalClock); 
    } 
    private void Nonevent_Event() { 
     String stringDate = ""; 

     Date_Class.date_time(stringCalendar); 

     stringCalendar.setText(stringDate); 
    } 

    //method to link GUI items to code 
    private void Init_GUI() { 
     stringHeader = (TextView)findViewById(R.id.Header); 
     stringName = (TextView)findViewById(R.id.Name); 
     stringProject = (TextView)findViewById(R.id.ProjectName); 
     stringEnd = (TextView)findViewById(R.id.EndOfProgram); 

     stringHeader.setText("Day 1 Project 1 - Travis Finlan"); 
     stringName.setText("Travis Finlan"); 
     stringProject.setText("Day 1 Project 1"); 
     stringEnd.setText("End of Program"); 
    } 
}

Date_Class.java：

另外，如果你看到任何錯誤，請讓我知道。我似乎無法弄清楚爲什麼它會一直撞在我身上。我只是想讓它顯示當前日期以及當前時間。我必須擁有非實例化類中的所有方法，因此必須將其拉下。

logcat的信息

02-19 17:02:17.785: DEBUG/AndroidRuntime(2095): >>>>>>>>>>>>>> AndroidRuntime START <<<<<<<<<<<<<< 
02-19 17:02:17.785: DEBUG/AndroidRuntime(2095): CheckJNI is ON 
02-19 17:02:17.885: DEBUG/AndroidRuntime(2095): --- registering native functions --- 
02-19 17:02:17.915: INFO/jdwp(2095): Ignoring second debugger -- accepting and dropping 
02-19 17:02:18.305: DEBUG/AndroidRuntime(2095): Shutting down VM 
02-19 17:02:18.305: DEBUG/dalvikvm(2095): Debugger has detached; object registry had 1 entries 
02-19 17:02:18.327: INFO/AndroidRuntime(2095): NOTE: attach of thread 'Binder Thread #3' failed 
02-19 17:02:18.635: DEBUG/AndroidRuntime(2103): >>>>>>>>>>>>>> AndroidRuntime START <<<<<<<<<<<<<< 
02-19 17:02:18.635: DEBUG/AndroidRuntime(2103): CheckJNI is ON 
02-19 17:02:18.736: DEBUG/AndroidRuntime(2103): --- registering native functions --- 
02-19 17:02:18.755: INFO/jdwp(2103): Ignoring second debugger -- accepting and dropping 
02-19 17:02:19.175: INFO/ActivityManager(59): Starting activity: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.example.d1project1/.MainActivity } 
02-19 17:02:19.195: INFO/ActivityManager(59): Start proc com.example.d1project1 for activity com.example.d1project1/.MainActivity: pid=2109 uid=10036 gids={} 
02-19 17:02:19.225: DEBUG/AndroidRuntime(2103): Shutting down VM 
02-19 17:02:19.225: DEBUG/dalvikvm(2103): Debugger has detached; object registry had 1 entries 
02-19 17:02:19.275: INFO/dalvikvm(2103): JNI: AttachCurrentThread (from ???.???) 
02-19 17:02:19.275: INFO/AndroidRuntime(2103): NOTE: attach of thread 'Binder Thread #3' failed 
02-19 17:02:19.365: INFO/jdwp(2109): Ignoring second debugger -- accepting and dropping 
02-19 17:02:19.679: INFO/System.out(2109): Current time => Wed Feb 19 17:02:19 CST 2014 
02-19 17:02:19.686: DEBUG/AndroidRuntime(2109): Shutting down VM 
02-19 17:02:19.686: WARN/dalvikvm(2109): threadid=1: thread exiting with uncaught exception (group=0x4001d800) 
02-19 17:02:19.696: ERROR/AndroidRuntime(2109): FATAL EXCEPTION: main 
02-19 17:02:19.696: ERROR/AndroidRuntime(2109): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.d1project1/com.example.d1project1.MainActivity}: java.lang.NullPointerException 
02-19 17:02:19.696: ERROR/AndroidRuntime(2109):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 
02-19 17:02:19.696: ERROR/AndroidRuntime(2109):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 
02-19 17:02:19.696: ERROR/AndroidRuntime(2109):  at android.app.ActivityThread.access$2300(ActivityThread.java:125) 
02-19 17:02:19.696: ERROR/AndroidRuntime(2109):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 
02-19 17:02:19.696: ERROR/AndroidRuntime(2109):  at android.os.Handler.dispatchMessage(Handler.java:99) 
02-19 17:02:19.696: ERROR/AndroidRuntime(2109):  at android.os.Looper.loop(Looper.java:123) 
02-19 17:02:19.696: ERROR/AndroidRuntime(2109):  at android.app.ActivityThread.main(ActivityThread.java:4627) 
02-19 17:02:19.696: ERROR/AndroidRuntime(2109):  at java.lang.reflect.Method.invokeNative(Native Method) 
02-19 17:02:19.696: ERROR/AndroidRuntime(2109):  at java.lang.reflect.Method.invoke(Method.java:521) 
02-19 17:02:19.696: ERROR/AndroidRuntime(2109):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
02-19 17:02:19.696: ERROR/AndroidRuntime(2109):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
02-19 17:02:19.696: ERROR/AndroidRuntime(2109):  at dalvik.system.NativeStart.main(Native Method) 
02-19 17:02:19.696: ERROR/AndroidRuntime(2109): Caused by: java.lang.NullPointerException 
02-19 17:02:19.696: ERROR/AndroidRuntime(2109):  at com.example.d1project1.MainActivity.Nonevent_Event(MainActivity.java:44) 
02-19 17:02:19.696: ERROR/AndroidRuntime(2109):  at com.example.d1project1.MainActivity.onCreate(MainActivity.java:32) 
02-19 17:02:19.696: ERROR/AndroidRuntime(2109):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
02-19 17:02:19.696: ERROR/AndroidRuntime(2109):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 
02-19 17:02:19.696: ERROR/AndroidRuntime(2109):  ... 11 more 
02-19 17:02:19.706: WARN/ActivityManager(59): Force finishing activity com.example.d1project1/.MainActivity 
02-19 17:02:19.706: WARN/ActivityManager(59): Force finishing activity com.android.mms/.ui.ConversationList 
02-19 17:02:20.206: WARN/ActivityManager(59): Activity pause timeout for HistoryRecord{4a4c5dd0 com.example.d1project1/.MainActivity} 
02-19 17:02:24.827: INFO/Process(2109): Sending signal. PID: 2109 SIG: 9 
02-19 17:02:24.846: INFO/ActivityManager(59): Process com.example.d1project1 (pid 2109) has died. 
02-19 17:02:26.416: DEBUG/dalvikvm(233): GC_EXPLICIT freed 4119 objects/277728 bytes in 123ms 
02-19 17:02:31.137: WARN/ActivityManager(59): Activity destroy timeout for HistoryRecord{4a4c5dd0 com.example.d1project1/.MainActivity} 
02-19 17:02:39.466: DEBUG/SntpClient(59): request time failed: java.net.SocketException: Address family not supported by protocol

來源

2014-02-19 Travis

請發佈logcat的輸出以便我們可以看到崩潰的原因。 – Ameen

@Ameen我如何得到logcat的輸出？我進去了，那裏什麼都沒有。 – Travis

通常，您的IDE（Eclipse，Android Studio等）爲您打印logcat輸出。您也可以通過adb命令手動獲取它，請參閱http://developer.android.com/tools/help/logcat.html – Ameen

你從來沒有在MainActivity類設置字段stringCalendar。因此，您從此行獲得NullPointerException：

stringCalendar.setText(stringDate);

來源

2014-02-19 22:31:10 Henry

在android上發生崩潰

回答

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