Android 从PendingEvent.getActivity获取空指针异常

我试图通过单击一个按钮来添加一个挂起的意图来实现报警，但我在“android:app.pendingent.getActivity（pendingent.java:257）”和“android:app.pendingent.getActivity（pendingent.java:224）”上得到一个空指针异常

这是我的代码，点击“添加”按钮可以创建挂起的意图

public class DisplayAlertMessage extends Activity {
private int mYear, mMonth, mDay, mHour, mMinute;
private long alarm_time;
    private int rem = 0;
    private String date,time;
    private String lists1[] = new String[10];
static final int DATE_DIALOG_ID = 999;

@SuppressLint("InflateParams") 
public void displayAlertDialog(LayoutInflater inflater,final MainActivity obj,final MainActivity obj1,final Context con) {
    /** This intent invokes the activity DemoActivity, which in turn opens the AlertDialog window */
    final Intent in = new Intent("com.example.todotry_1.demoactivity");
     final View alertLayout = inflater.inflate(R.layout.layout_custom_dialog, null);
     final EditText Note = (EditText) alertLayout.findViewById(R.id.Note);
     final EditText Lists = (EditText) alertLayout.findViewById(R.id.Lists);
     final TextView Remind = (TextView) alertLayout.findViewById(R.id.Remind);
     final TextView Time = (TextView) alertLayout.findViewById(R.id.Time);
     final TextView Date = (TextView) alertLayout.findViewById(R.id.Date);
     final TextView Timeval = (TextView) alertLayout.findViewById(R.id.Timeval);
     final TextView Dateval = (TextView) alertLayout.findViewById(R.id.Dateval);
     final ImageView iv=(ImageView) alertLayout.findViewById(R.id.img);
     i=iv;
     AlertDialog.Builder alert = new AlertDialog.Builder(obj,R.style.DialogTheme);
     Remind.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View v) {
               Log.d("onCLICK","REMIND");
               Toast.makeText(con, "REMIND CLICKED", Toast.LENGTH_SHORT).show();
               Remind.setVisibility(View.GONE);
               Time.setVisibility(View.VISIBLE);
               Date.setVisibility(View.VISIBLE);
               rem = 1;
               Time.setOnClickListener(new OnClickListener() {
                @Override
                            public void onClick(View v) {
                            final Calendar c = Calendar.getInstance();
                                mHour = c.get(Calendar.HOUR_OF_DAY);
                                mMinute = c.get(Calendar.MINUTE);

                                // Launch Time Picker Dialog
                                TimePickerDialog tpd = new TimePickerDialog(obj,new TimePickerDialog.OnTimeSetListener() 
                                {

                                            @Override
                                            public void onTimeSet(TimePicker view, int hourOfDay,int minute) {
                                             // Display Selected time in textbox
                                            Timeval.setVisibility(View.VISIBLE);
                                                Timeval.setText(hourOfDay + ":" + minute);
                                            }
                                        }, mHour, mMinute, false);
                                    tpd.show();
                                    time = mHour+":"+mMinute;
                            }
                    });
               Date.setOnClickListener(new OnClickListener() {
                            @Override
                            public void onClick(View v) {
                            final Calendar c = Calendar.getInstance();
                                mYear = c.get(Calendar.YEAR);
                                mMonth = c.get(Calendar.MONTH);
                                mDay = c.get(Calendar.DAY_OF_MONTH);

                            // Launch Date Picker Dialog
                            DatePickerDialog dpd = new DatePickerDialog(obj,new DatePickerDialog.OnDateSetListener() {
                @Override
                                        public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
                                            // Display Selected date in textbox
                                        Dateval.setVisibility(View.VISIBLE);
                                            Dateval.setText(dayOfMonth + "-"+ (monthOfYear + 1) + "-" + year);
                }
                                    }, mYear, mMonth, mDay);
                                dpd.show();
                                date = mDay+"-"+mMonth+"-"+mYear;
                            }
                    });
               GregorianCalendar calendar = new GregorianCalendar(mYear,mMonth,mDay, mHour, mMinute);
               alarm_time = calendar.getTimeInMillis();
           }
        });


     alert.setTitle("ADD NOTE");
     alert.setView(alertLayout);
     alert.setCancelable(false);
     alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {

     @Override
     public void onClick(DialogInterface dialog, int which) {
     Toast.makeText(con, "Cancel clicked", Toast.LENGTH_SHORT).show();
     }
     });

     alert.setPositiveButton("ADD", new DialogInterface.OnClickListener() {

     @Override
     public void onClick(DialogInterface dialog, int which) {
     // code for matching password
     String note = Note.getText().toString();
     String lists = Lists.getText().toString() + '\n';

     int l=lists.length();
     int i=0;
     String one="";
     char q;
     String main1="";
     int count = 0,j=0;
     for (i=0;i<l;i++)
     {
         q=lists.charAt(i);
         if(q!='\n' )
             one += q;
         else
         { 
             Log.d("the string",":" + one);
             //Toast.makeText(getBaseContext(), "Words " + one , Toast.LENGTH_SHORT).show();
             main1 += count + " : " + one;
             lists1[j++] = one;
             one=""; 
         }
         count++;
     }
     Log.d("DISplay","111before finish add");
     if((date == null)^(time == null))
     {
         Toast.makeText(con, "Enter both date and time to set alarm", Toast.LENGTH_SHORT).show();
     }
     else{
     TaskDBHelper ob = new TaskDBHelper(obj1);
     SQLiteDatabase sqlDB = ob.getWritableDatabase();
     if((date != null)&(time != null))
     {
         String f1 = String.format("INSERT INTO prioritised (task,date,time,ringtone,done,Hidden) VALUES('"+note+"','"+date+"','"+time+"','"+""+"',0,"+MainActivity.getStat()+")");
         sqlDB.execSQL(f1);
         if((j!=0)&(main1!="\n") )
         {
             int id=0;
             Cursor cursor = sqlDB.rawQuery("SELECT _id from prioritised where task = '"+note+"'",null);

             if (cursor != null) {
                    try {
                        if (cursor.moveToFirst()) {
                            id = cursor.getInt(0);
                        }
                    } finally {
                        cursor.close();
                    }
                }
             Log.d("Prio"," "+id);
             String add;
             for(int k=0;k<j;k++)
             {
                 add = String.format("INSERT INTO sublistprioritised (_id1,sublist,done,hidden) VALUES("+id+",'"+lists1[k]+"',0,"+MainActivity.getStat()+")");
                 sqlDB.execSQL(add);
             }

         }

            /** Creating a Pending Intent */
            Context x=getBaseContext();
                            int requestID = (int) System.currentTimeMillis();
            PendingIntent operation = PendingIntent.getActivity(x, requestID, in,Intent.FLAG_ACTIVITY_NEW_TASK);

            /** Getting a reference to the System Service ALARM_SERVICE */
            AlarmManager alarmManager = (AlarmManager) x.getSystemService(ALARM_SERVICE);

            /** Setting an alarm, which invokes the operation at alart_time */
                    alarmManager.set(AlarmManager.RTC_WAKEUP  , alarm_time , operation);
                    /** Alert is set successfully */
                    Toast.makeText(x, "Alarm is set successfully",Toast.LENGTH_SHORT).show();
     }
     else{
     String f2 = String.format("INSERT INTO unprioritised (task,done,Hidden) VALUES('"+note+"',0,"+MainActivity.getStat()+")");
     sqlDB.execSQL(f2);
     if((j!=0)&(main1!="\n") )
     {
         int id=0;
         Cursor cursor = sqlDB.rawQuery("SELECT _id from unprioritised where task = '"+note+"'",null);
         if (cursor != null) {
                try {
                    if (cursor.moveToFirst()) {
                        id = cursor.getInt(0);
                    }
                } finally {
                    cursor.close();
                }
            }
         String add;
         for(int k=0;k<j;k++)
         {
             add = String.format("INSERT INTO sublistunprioritised (_id1,sublist,done,Hidden) VALUES("+id+",'"+lists1[k]+"',0,"+MainActivity.getStat()+")");
             sqlDB.execSQL(add);
         }

     }
     }
     }
     }
     });
     AlertDialog dialog = alert.create();
     dialog.show();
     }
}

更新日志：

04-02 15:59:03.140: E/AndroidRuntime(1880): android.database.sqlite.SQLiteConstraintException: columns _id1, sublist are not unique (code 19)
04-02 15:59:03.140: E/AndroidRuntime(1880): at android.database.sqlite.SQLiteConnection.nativeExecuteForChangedRowCount(Native Method)
04-02 15:59:03.140: E/AndroidRuntime(1880): at android.database.sqlite.SQLiteConnection.executeForChangedRowCount(SQLiteConnection.java:734)
04-02 15:59:03.140: E/AndroidRuntime(1880): at android.database.sqlite.SQLiteSession.executeForChangedRowCount(SQLiteSession.java:754)
04-02 15:59:03.140: E/AndroidRuntime(1880): at android.database.sqlite.SQLiteStatement.executeUpdateDelete(SQLiteStatement.java:64)
04-02 15:59:03.140: E/AndroidRuntime(1880): at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1674)
04-02 15:59:03.140: E/AndroidRuntime(1880): at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1603)
04-02 15:59:03.140: E/AndroidRuntime(1880): at com.example.todotry_1.DisplayAlertMessage$4.onClick(DisplayAlertMessage.java:236)
04-02 15:59:03.140: E/AndroidRuntime(1880): at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166)
04-02 15:59:03.140: E/AndroidRuntime(1880): at android.os.Handler.dispatchMessage(Handler.java:102)
04-02 15:59:03.140: E/AndroidRuntime(1880): at android.os.Looper.loop(Looper.java:136)
04-02 15:59:03.140: E/AndroidRuntime(1880): at android.app.ActivityThread.main(ActivityThread.java:5017)
04-02 15:59:03.140: E/AndroidRuntime(1880): at java.lang.reflect.Method.invokeNative(Native Method)
04-02 15:59:03.140: E/AndroidRuntime(1880): at java.lang.reflect.Method.invoke(Method.java:515)
04-02 15:59:03.140: E/AndroidRuntime(1880): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
04-02 15:59:03.140: E/AndroidRuntime(1880): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
04-02 15:59:03.140: E/AndroidRuntime(1880): at dalvik.system.NativeStart.main(Native Method)

---

这里似乎没有必要调用

getBaseContext（）

，而且您可能不想使用

currentTimeMillis（）

作为请求代码，以防需要取消

pendingEvent

：

/** Creating a Pending Intent */
            //Context x=getBaseContext();
            //int requestID = (int) System.currentTimeMillis();

            PendingIntent operation = null;
            //Make sure nothing is null for debugging purposes
            if (con == null){
                Log.e("onCLICK","con is null");
            }
            else if (in == null){
                Log.e("onCLICK","in is null");
            }
            else{
                operation = PendingIntent.getActivity(con, 0, in,PendingIntent.FLAG_UPDATE_CURRENT);
            }

            if (operation != null){
               /** Getting a reference to the System Service ALARM_SERVICE */
               AlarmManager alarmManager = (AlarmManager) con.getSystemService(ALARM_SERVICE);

               /** Setting an alarm, which invokes the operation at alart_time */
                alarmManager.set(AlarmManager.RTC_WAKEUP  , alarm_time , operation);
                /** Alert is set successfully */
                Toast.makeText(con, "Alarm is set successfully",Toast.LENGTH_SHORT).show();

            }

请看这篇文章，并举一些例子：

编辑：我刚刚将PendingEvent代码放入AndroidStudio，它给了我以下消息：

必须是一个或多个：PendingIntent.FLAG_one_SHOT， PendingEvent.FLAG_否_创建，PendingEvent.FLAG_取消_当前， pendingent.FLAG\u UPDATE\u CURRENT，Intent.FILL\u IN\u ACTION， 数据中的Intent.FILL，类别中的Intent.FILL， 组件中的Intent.FILL\u，包中的Intent.FILL\u， Intent.FILL\u在\u源\u边界中，Intent.FILL\u在\u选择器中， Intent.FILL_IN_CLIP_DATA less。。。（Ctrl+F1）报告两种类型的 问题：提供错误类型的资源标识符。对于 例如，当调用Resources.getString（int-id）时，您应该 传递R.string.something，而不是R.drawable.something。通过 方法的常数错误，该方法需要一组特定的 常数。例如，调用View#setLayoutDirection时 参数必须是android.view.view.LAYOUT\u DIRECTION\u LTR或 android.view.view.LAYOUT\u DIRECTION\u RTL

---

查看此处要使用的有效标志的更多信息。

logcat数据将更有用。.编辑：从PendingEvent.java添加到问题行224的logcat数据是“公共静态PendingEvent getBroadcast（上下文上下文、int请求代码、意图、int标志）”下面的方法更让我困惑，因为它没有被调用。看起来您试图在表中为主键插入重复的值。看这里：看起来PendingEvent代码现在正在运行。尝试卸载/重新安装，并查看第一次运行时是否出现数据库错误。@DanielNugent谢谢。成功了…谢谢你的回复。嘿，你能重新发布链接作为例子吗？其意图在android清单中声明。@user3528608它是

demoactivity

还是

demoactivity

？嗯，如果这就是动作，那么与意图过滤器相关联的活动是什么？我懂了。那可能没问题。尝试添加代码，确保在使用之前没有任何内容为null，然后查看是否找到任何内容。可能是您的

上下文

为空。

/** Creating a Pending Intent */
            //Context x=getBaseContext();
            //int requestID = (int) System.currentTimeMillis();

            PendingIntent operation = null;
            //Make sure nothing is null for debugging purposes
            if (con == null){
                Log.e("onCLICK","con is null");
            }
            else if (in == null){
                Log.e("onCLICK","in is null");
            }
            else{
                operation = PendingIntent.getActivity(con, 0, in,PendingIntent.FLAG_UPDATE_CURRENT);
            }

            if (operation != null){
               /** Getting a reference to the System Service ALARM_SERVICE */
               AlarmManager alarmManager = (AlarmManager) con.getSystemService(ALARM_SERVICE);

               /** Setting an alarm, which invokes the operation at alart_time */
                alarmManager.set(AlarmManager.RTC_WAKEUP  , alarm_time , operation);
                /** Alert is set successfully */
                Toast.makeText(con, "Alarm is set successfully",Toast.LENGTH_SHORT).show();

            }