Android 为日历实例设置硬代码值后出现空指针异常

我正在使用android服务开发android

推送通知

当我从
日期选择器
中选择日期/月/年时，它就像一个符咒（请参见下面的代码）。但是，当我试图用
硬代码
值设置
日历实例
时，它会给我一个空指针异常

我是如何尝试的：

private ScheduleClient scheduleClient;

private SharedPreferences prefs; 
private String prefName = "userPrefs";
private static final String TITLE_KEY = "title"; 

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

    // Create a new service client and bind our activity to this service
    scheduleClient = new ScheduleClient(this);
    scheduleClient.doBindService();


    t1 = (TextView) findViewById(R.id.txt);
    nofitication();
}

private void nofitication(){

    Calendar c = Calendar.getInstance();
    c.clear();
    int year = 2014;
    int month = 3;
    int day = 21;
    c.set(year, month, day); 


    prefs = getSharedPreferences(prefName, MODE_PRIVATE); 
    SharedPreferences.Editor editor = prefs.edit(); 

    //---save the values in the EditText view to preferences--- 
     editor.putString(TITLE_KEY,"Muneeb's Notification"); 
     //---saves the values--- 
     editor.commit(); 

        scheduleClient.setAlarmForNotification(c);

//     Toast.makeText(this, "Notification set for: "+ day +"/"+ (month+1) +"/"+ year, Toast.LENGTH_SHORT).show();

}

scheduleClient.setAlarmForNotification(c);

我为此尝试了两种方法，但从这两种方法中我都得到了一个例外

1。方法

    Calendar c = Calendar.getInstance();
    c.clear();
    int year = 2014;
    int month = 3;
    int day = 21;
    c.set(year, month, day); 

    Calendar c = Calendar.getInstance();
    Calendar dt = Calendar.getInstance();
    dt.clear();
    dt.set(c.get(Calendar.YEAR), c.get(Calendar.MONTH), c.get(Calendar.DATE));

2。方法

    Calendar c = Calendar.getInstance();
    c.clear();
    int year = 2014;
    int month = 3;
    int day = 21;
    c.set(year, month, day); 

    Calendar c = Calendar.getInstance();
    Calendar dt = Calendar.getInstance();
    dt.clear();
    dt.set(c.get(Calendar.YEAR), c.get(Calendar.MONTH), c.get(Calendar.DATE));

main活动：

private ScheduleClient scheduleClient;

private SharedPreferences prefs; 
private String prefName = "userPrefs";
private static final String TITLE_KEY = "title"; 

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

    // Create a new service client and bind our activity to this service
    scheduleClient = new ScheduleClient(this);
    scheduleClient.doBindService();


    t1 = (TextView) findViewById(R.id.txt);
    nofitication();
}

private void nofitication(){

    Calendar c = Calendar.getInstance();
    c.clear();
    int year = 2014;
    int month = 3;
    int day = 21;
    c.set(year, month, day); 


    prefs = getSharedPreferences(prefName, MODE_PRIVATE); 
    SharedPreferences.Editor editor = prefs.edit(); 

    //---save the values in the EditText view to preferences--- 
     editor.putString(TITLE_KEY,"Muneeb's Notification"); 
     //---saves the values--- 
     editor.commit(); 

        scheduleClient.setAlarmForNotification(c);

//     Toast.makeText(this, "Notification set for: "+ day +"/"+ (month+1) +"/"+ year, Toast.LENGTH_SHORT).show();

}

scheduleClient.setAlarmForNotification(c);

此行出现错误：

private ScheduleClient scheduleClient;

private SharedPreferences prefs; 
private String prefName = "userPrefs";
private static final String TITLE_KEY = "title"; 

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

    // Create a new service client and bind our activity to this service
    scheduleClient = new ScheduleClient(this);
    scheduleClient.doBindService();


    t1 = (TextView) findViewById(R.id.txt);
    nofitication();
}

private void nofitication(){

    Calendar c = Calendar.getInstance();
    c.clear();
    int year = 2014;
    int month = 3;
    int day = 21;
    c.set(year, month, day); 


    prefs = getSharedPreferences(prefName, MODE_PRIVATE); 
    SharedPreferences.Editor editor = prefs.edit(); 

    //---save the values in the EditText view to preferences--- 
     editor.putString(TITLE_KEY,"Muneeb's Notification"); 
     //---saves the values--- 
     editor.commit(); 

        scheduleClient.setAlarmForNotification(c);

//     Toast.makeText(this, "Notification set for: "+ day +"/"+ (month+1) +"/"+ year, Toast.LENGTH_SHORT).show();

}

scheduleClient.setAlarmForNotification(c);

当我运行带有硬代码值的代码时，带有的
c
将始终变为null.（参见下图）


logcat

    04-21 10:07:39.430: E/AndroidRuntime(4721): FATAL EXCEPTION: main
04-21 10:07:39.430: E/AndroidRuntime(4721): Process: com.example.customnotification, PID: 4721
04-21 10:07:39.430: E/AndroidRuntime(4721): java.lang.RuntimeException: Unable to start activity ComponentInfo    {com.example.customnotification/com.example.customnotification.TestingActivity}: java.lang.NullPointerException
04-21 10:07:39.430: E/AndroidRuntime(4721):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2596)
04-21 10:07:39.430: E/AndroidRuntime(4721):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2653)
04-21 10:07:39.430: E/AndroidRuntime(4721):     at android.app.ActivityThread.access$800(ActivityThread.java:156)
04-21 10:07:39.430: E/AndroidRuntime(4721):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1355)
04-21 10:07:39.430: E/AndroidRuntime(4721):     at android.os.Handler.dispatchMessage(Handler.java:102)
04-21 10:07:39.430: E/AndroidRuntime(4721):     at android.os.Looper.loop(Looper.java:157)
04-21 10:07:39.430: E/AndroidRuntime(4721):     at android.app.ActivityThread.main(ActivityThread.java:5872)
04-21 10:07:39.430: E/AndroidRuntime(4721):     at java.lang.reflect.Method.invokeNative(Native Method)
04-21 10:07:39.430: E/AndroidRuntime(4721):     at java.lang.reflect.Method.invoke(Method.java:515)
04-21 10:07:39.430: E/AndroidRuntime(4721):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1069)
04-21 10:07:39.430: E/AndroidRuntime(4721):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:885)
04-21 10:07:39.430: E/AndroidRuntime(4721):     at dalvik.system.NativeStart.main(Native Method)
04-21 10:07:39.430: E/AndroidRuntime(4721): Caused by: java.lang.NullPointerException
04-21 10:07:39.430: E/AndroidRuntime(4721):     at services.ScheduleClient.setAlarmForNotification(ScheduleClient.java:62)
04-21 10:07:39.430: E/AndroidRuntime(4721):     at com.example.customnotification.TestingActivity.nofitication(TestingActivity.java:56)
04-21 10:07:39.430: E/AndroidRuntime(4721):     at com.example.customnotification.TestingActivity.onCreate(TestingActivity.java:31)
04-21 10:07:39.430: E/AndroidRuntime(4721):     at android.app.Activity.performCreate(Activity.java:5312)
04-21 10:07:39.430: E/AndroidRuntime(4721):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1111)
04-21 10:07:39.430: E/AndroidRuntime(4721):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2552)
04-21 10:07:39.430: E/AndroidRuntime(4721):     ... 11 more

尚未绑定服务时，无法设置日历。
你应该听我说

在您的具体示例中，您应该在ScheduleClient.java:47中设置日历
这是连接服务和设置日历的时刻

类似于（ScheduleClient.java）的内容：

}
您的屏幕截图没有真正显示
c
为
null
。相反，
Exception e
为
null
。您可以发布
setAlarmForNotification（）
的代码吗？另外，为
NullPointerException
发布日志猫。现在我已经上传了日志猫，请检查日志猫。@AndrewT。谢谢你的回复
setAlarmForNotification
是服务类中的函数。
由以下原因引起：java.lang.NullPointerException at services.ScheduleClient.setAlarmForNotification（ScheduleClient.java:62）
。如果可能，检查并将代码张贴在
ScheduleClient
mBoundService.setAlarm（c）内的第62行这是ScheduleClient.class中的行号62