Добавить событие календаря в Android - Android

Question

Я совершенно новый в разработке приложений для Android, я пытаюсь разработать приложение, которое добавит событие в мой Android-телефон. вот код, который я пробовал:

Проблема. Мое приложение получает сбой.

AddCalendarEventTestAction.java

package com.app.mytestapp; 

import android.content.ContentResolver; 
import android.content.ContentValues; 
import android.content.Context; 
import android.database.Cursor; 
import android.provider.CalendarContract; 
import android.util.Log; 

import java.util.Calendar; 
import java.util.HashMap; 
import java.util.TimeZone; 
public class AddCalendarEventTestAction { 
    String[] CALENDAR_QUERY_COLUMNS = { "_id", "name", "visible", "ownerAccount" }; 
    CalendarContract contract; 
    String eventStartTitle = "POST Test"; 
    int eventStartYear; 
    Context contx; 

    public AddCalendarEventTestAction() 
    { 
    } 


    private void addEvent() 
    { 
     Calendar localCalendar1 = Calendar.getInstance(); 
     localCalendar1.set(2015, 3, 4, 1, 40); 
     // localCalendar1.set(this.eventStartYear, this.eventStartMonth, this.eventStartDate, this.eventStartHour, this.eventStartMinute); 
     Calendar localCalendar2 = Calendar.getInstance(); 
     localCalendar2.set(2015, 3, 4, 3, 45); 
     ContentResolver localContentResolver = contx.getContentResolver(); 
     Log.d("Test",CalendarContract.Calendars.CONTENT_URI.toString()); 
     Cursor localCursor = localContentResolver.query(CalendarContract.Calendars.CONTENT_URI, CALENDAR_QUERY_COLUMNS, null, null, null); 
     Log.d("Test","Calendar cursor = " + localCursor); 
     if (localCursor.moveToNext()) 
     { 
      localCursor.getString(0); 
      localCursor.getString(1); 
      if (!localCursor.getString(2).equals("0")); 
      for (boolean bool = true; ; bool = false) 
      { 
       Boolean.valueOf(bool); 
       String str = localCursor.getString(3); 
       Log.d("Test","Found calendar " + str); 
       break; 
      } 
     } 
     TimeZone timeZone = TimeZone.getDefault(); 
     ContentValues localContentValues = new ContentValues(); 
     localContentValues.put(CalendarContract.Events.CALENDAR_ID, Integer.valueOf(1)); 
     localContentValues.put(CalendarContract.Events.TITLE, this.eventStartTitle); 
     localContentValues.put(CalendarContract.Events.DTSTART, localCalendar1.getTimeInMillis()); 
     localContentValues.put(CalendarContract.Events.EXDATE, localCalendar2.getTimeInMillis()); 
     localContentValues.put(CalendarContract.Events.EVENT_TIMEZONE, timeZone.getID()); 
     Integer.parseInt(localContentResolver.insert(CalendarContract.Events.CONTENT_URI, localContentValues).getLastPathSegment()); 
    } 


    public void start() 
    { 
     addEvent(); 
    } 
} 

MainActivity.java

package com.app.mytestapp; 

import android.support.v7.app.ActionBarActivity; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.telephony.SmsManager; 
import android.view.View; 

import java.util.ArrayList; 


public class MainActivity extends ActionBarActivity { 

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


    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.menu_main, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 
     // as you specify a parent activity in AndroidManifest.xml. 
     int id = item.getItemId(); 

     //noinspection SimplifiableIfStatement 
     if (id == R.id.action_settings) { 
      return true; 
     } 

     return super.onOptionsItemSelected(item); 
    } 

     public void performAction(View view) 
     { 
      AddCalendarEventTestAction calobj = new AddCalendarEventTestAction(); 
      calobj.start(); 

     } 

} 

Menifest.xml

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.app.mytestapp" > 



    <application 
     android:allowBackup="true" 
     android:icon="@mipmap/ic_launcher" 
     android:label="@string/app_name" 
     android:theme="@style/AppTheme" > 
     <activity 
      android:name=".MainActivity" 
      android:label="@string/app_name" > 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 
    </application> 
    <uses-permission android:name="android.permission.SEND_SMS"> 
    </uses-permission> 
    <uses-permission android:name="android.permission.RECEIVE_SMS"> 
    </uses-permission> 
    <uses-permission android:name="android.permission.READ_CALENDAR" /> 
    <uses-permission android:name="android.permission.WRITE_CALENDAR" /> 

</manifest> 

Logcat:

java.lang.IllegalStateException: Could not execute method of the activity 
      at android.view.View$1.onClick(View.java:3823) 
      at android.view.View.performClick(View.java:4438) 
      at android.view.View$PerformClick.run(View.java:18439) 
      at android.os.Handler.handleCallback(Handler.java:733) 
      at android.os.Handler.dispatchMessage(Handler.java:95) 
      at android.os.Looper.loop(Looper.java:136) 
      at android.app.ActivityThread.main(ActivityThread.java:5034) 
      at java.lang.reflect.Method.invokeNative(Native Method) 
      at java.lang.reflect.Method.invoke(Method.java:515) 
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602) 
      at dalvik.system.NativeStart.main(Native Method) 
    Caused by: java.lang.reflect.InvocationTargetException 
      at java.lang.reflect.Method.invokeNative(Native Method) 
      at java.lang.reflect.Method.invoke(Method.java:515) 
      at android.view.View$1.onClick(View.java:3818) 
            at android.view.View.performClick(View.java:4438) 
            at android.view.View$PerformClick.run(View.java:18439) 
            at android.os.Handler.handleCallback(Handler.java:733) 
            at android.os.Handler.dispatchMessage(Handler.java:95) 
            at android.os.Looper.loop(Looper.java:136) 
            at android.app.ActivityThread.main(ActivityThread.java:5034) 
            at java.lang.reflect.Method.invokeNative(Native Method) 
            at java.lang.reflect.Method.invoke(Method.java:515) 
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602) 
            at dalvik.system.NativeStart.main(Native Method) 
    Caused by: java.lang.NullPointerException 
      at com.app.mytestapp.AddCalendarEventTestAction.addEvent(AddCalendarEventTestAction.java:38) 
      at com.app.mytestapp.AddCalendarEventTestAction.start(AddCalendarEventTestAction.java:68) 
      at com.app.mytestapp.MainActivity.performAction(MainActivity.java:48) 
            at java.lang.reflect.Method.invokeNative(Native Method) 
            at java.lang.reflect.Method.invoke(Method.java:515) 
            at android.view.View$1.onClick(View.java:3818) 
            at android.view.View.performClick(View.java:4438) 
            at android.view.View$PerformClick.run(View.java:18439) 
            at android.os.Handler.handleCallback(Handler.java:733) 
            at android.os.Handler.dispatchMessage(Handler.java:95) 
            at android.os.Looper.loop(Looper.java:136) 
            at android.app.ActivityThread.main(ActivityThread.java:5034) 
            at java.lang.reflect.Method.invokeNative(Native Method) 
            at java.lang.reflect.Method.invoke(Method.java:515) 
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602) 
            at dalvik.system.NativeStart.main(Native Method 

Answer 1

Найденный Решение: Я не инициализирует контекст, что и послужило причиной мое приложение получало аварии. Только что добавленный ниже код

Context mycontx; 

    public AddCalendarEventTestAction(Context contx) 
    { 
     mycontx =contx; 
    }