使用phonegap构建一个启动后台服务的应用程序，并在后台服务中调用一个以json格式提取所有用户联系人的方法。
以下是我测试的代码：
http://code.tutsplus.com/tutorials/build-a-contacts-application-with-jquery-mobile-the-android-sdk-part-1--mobile-5727
以下代码：
public static String getAllContactDisplaysJSON(ContentResolver contentResolver){
// Obtain all ContactDisplay objects from database and sort them
ArrayList<ContactDisplay> list = getAllContactDisplays(contentResolver);
Collections.sort(list);
// Populate the data structure consisting of ContactList-ContactGroup-ContactDisplay objects
// Start with initializing some variables
ContactList contactList = new ContactList();
String key = "";
ArrayList<ContactDisplay> values = new ArrayList<ContactDisplay>();
ContactGroup group = null;
StringWriter writer = new StringWriter();
// Process the list ContactDisplay objects to construct the data structure
if(list != null && !list.isEmpty()){
for(ContactDisplay display:list){
if(!display.getKey().equals(key)){
if(values.size() > 0){
group = new ContactGroup();
group.setKey(key);
group.setValues(values);
contactList.getContacts().add(group);
}
key = display.getKey();
values = new ArrayList<ContactDisplay>();
}
values.add(display);
}
// Add the last group
if(values.size() > 0){
group = new ContactGroup();
group.setKey(key);
group.setValues(values);
contactList.getContacts().add(group);
}
}else{
return EMPTY_CONTACT_LIST;
}
// We have the data structure of ContactList-ContactGroup-ContactDisplay objects where
// contactList is the root level element. Write it to a JSON formatted string using
// org.codehaus.jackson.map.ObjectMapper.
try{
ObjectMapper mapper = new ObjectMapper();
mapper.writeValue(writer, contactList);
}catch(Exception e){
return EMPTY_CONTACT_LIST;
}
return writer.toString();
}
从另一个类调用时：
protected JSONObject initialiseLatestResult() {
// TODO Auto-generated method stub
final String ContactData = ContactUtility.getAllContactDisplaysJSON(getContentResolver());
return null;
}
我在logcat中遇到以下错误：
03-01 07:55:25.289: E/AndroidRuntime(11022): FATAL EXCEPTION: main
03-01 07:55:25.289: E/AndroidRuntime(11022): java.lang.RuntimeException: Unable to create service com.mycontacts.MyService: java.lang.NullPointerException
03-01 07:55:25.289: E/AndroidRuntime(11022): at android.app.ActivityThread.handleCreateService(ActivityThread.java:1966)
03-01 07:55:25.289: E/AndroidRuntime(11022): at android.app.ActivityThread.access$2500(ActivityThread.java:117)
03-01 07:55:25.289: E/AndroidRuntime(11022): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:996)
03-01 07:55:25.289: E/AndroidRuntime(11022): at android.os.Handler.dispatchMessage(Handler.java:99)
03-01 07:55:25.289: E/AndroidRuntime(11022): at android.os.Looper.loop(Looper.java:130)
03-01 07:55:25.289: E/AndroidRuntime(11022): at android.app.ActivityThread.main(ActivityThread.java:3735)
03-01 07:55:25.289: E/AndroidRuntime(11022): at java.lang.reflect.Method.invokeNative(Native Method)
03-01 07:55:25.289: E/AndroidRuntime(11022): at java.lang.reflect.Method.invoke(Method.java:507)
03-01 07:55:25.289: E/AndroidRuntime(11022): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
03-01 07:55:25.289: E/AndroidRuntime(11022): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:662)
03-01 07:55:25.289: E/AndroidRuntime(11022): at dalvik.system.NativeStart.main(Native Method)
03-01 07:55:25.289: E/AndroidRuntime(11022): Caused by: java.lang.NullPointerException
03-01 07:55:25.289: E/AndroidRuntime(11022): at android.content.ContextWrapper.getContentResolver(ContextWrapper.java:90)
03-01 07:55:25.289: E/AndroidRuntime(11022): at com.mycontacts.NativeServices.SendPushMsg(NativeServices.java:68)
03-01 07:55:25.289: E/AndroidRuntime(11022): at com.mycontacts.MyService.initialiseLatestResult(MyService.java:63)
03-01 07:55:25.289: E/AndroidRuntime(11022): at com.red_folder.phonegap.plugin.backgroundservice.BackgroundService.initialiseService(BackgroundService.java:299)
03-01 07:55:25.289: E/AndroidRuntime(11022): at com.red_folder.phonegap.plugin.backgroundservice.BackgroundService.onCreate(BackgroundService.java:129)
03-01 07:55:25.289: E/AndroidRuntime(11022): at android.app.ActivityThread.handleCreateService(ActivityThread.java:1956)
03-01 07:55:25.289: E/AndroidRuntime(11022): ... 10 more
03-01 07:55:25.299: E/AndroidRuntime(11022): [Blue Error Handler] Make Debugging Report file for main
03-01 07:55:25.299: E/AndroidRuntime(11022): java.lang.RuntimeException: Unable to create service com.mycontacts.MyService: java.lang.NullPointerException
03-01 07:55:25.299: E/AndroidRuntime(11022): at android.app.ActivityThread.handleCreateService(ActivityThread.java:1966)
03-01 07:55:25.299: E/AndroidRuntime(11022): at android.app.ActivityThread.access$2500(ActivityThread.java:117)
03-01 07:55:25.299: E/AndroidRuntime(11022): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:996)
03-01 07:55:25.299: E/AndroidRuntime(11022): at android.os.Handler.dispatchMessage(Handler.java:99)
03-01 07:55:25.299: E/AndroidRuntime(11022): at android.os.Looper.loop(Looper.java:130)
03-01 07:55:25.299: E/AndroidRuntime(11022): at android.app.ActivityThread.main(ActivityThread.java:3735)
03-01 07:55:25.299: E/AndroidRuntime(11022): at java.lang.reflect.Method.invokeNative(Native Method)
03-01 07:55:25.299: E/AndroidRuntime(11022): at java.lang.reflect.Method.invoke(Method.java:507)
03-01 07:55:25.299: E/AndroidRuntime(11022): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
03-01 07:55:25.299: E/AndroidRuntime(11022): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:662)
03-01 07:55:25.299: E/AndroidRuntime(11022): at dalvik.system.NativeStart.main(Native Method)
03-01 07:55:25.299: E/AndroidRuntime(11022): Caused by: java.lang.NullPointerException
03-01 07:55:25.299: E/AndroidRuntime(11022): at android.content.ContextWrapper.getContentResolver(ContextWrapper.java:90)
03-01 07:55:25.299: E/AndroidRuntime(11022): at com.mycontacts.NativeServices.SendPushMsg(NativeServices.java:68)
03-01 07:55:25.299: E/AndroidRuntime(11022): at com.mycontacts.MyService.initialiseLatestResult(MyService.java:63)
03-01 07:55:25.299: E/AndroidRuntime(11022): at com.red_folder.phonegap.plugin.backgroundservice.BackgroundService.initialiseService(BackgroundService.java:299)
03-01 07:55:25.299: E/AndroidRuntime(11022): at com.red_folder.phonegap.plugin.backgroundservice.BackgroundService.onCreate(BackgroundService.java:129)
03-01 07:55:25.299: E/AndroidRuntime(11022): at android.app.ActivityThread.handleCreateService(ActivityThread.java:1956)
03-01 07:55:25.299: E/AndroidRuntime(11022): ... 10 more
03-01 07:55:32.529: I/BackgroundService(11063): Service creating
03-01 07:55:32.529: I/BackgroundService(11063): Initialising the service
03-01 07:55:32.529: W/dalvikvm(11063): threadid=1: thread exiting with uncaught exception (group=0x4017f560)
03-01 07:55:32.529: E/AndroidRuntime(11063): FATAL EXCEPTION: main
03-01 07:55:32.529: E/AndroidRuntime(11063): java.lang.RuntimeException: Unable to create service com.mycontacts.MyService: java.lang.NullPointerException
03-01 07:55:32.529: E/AndroidRuntime(11063): at android.app.ActivityThread.handleCreateService(ActivityThread.java:1966)
03-01 07:55:32.529: E/AndroidRuntime(11063): at android.app.ActivityThread.access$2500(ActivityThread.java:117)
03-01 07:55:32.529: E/AndroidRuntime(11063): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:996)
03-01 07:55:32.529: E/AndroidRuntime(11063): at android.os.Handler.dispatchMessage(Handler.java:99)
03-01 07:55:32.529: E/AndroidRuntime(11063): at android.os.Looper.loop(Looper.java:130)
03-01 07:55:32.529: E/AndroidRuntime(11063): at android.app.ActivityThread.main(ActivityThread.java:3735)
03-01 07:55:32.529: E/AndroidRuntime(11063): at java.lang.reflect.Method.invokeNative(Native Method)
03-01 07:55:32.529: E/AndroidRuntime(11063): at java.lang.reflect.Method.invoke(Method.java:507)
03-01 07:55:32.529: E/AndroidRuntime(11063): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
03-01 07:55:32.529: E/AndroidRuntime(11063): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:662)
03-01 07:55:32.529: E/AndroidRuntime(11063): at dalvik.system.NativeStart.main(Native Method)
03-01 07:55:32.529: E/AndroidRuntime(11063): Caused by: java.lang.NullPointerException
03-01 07:55:32.529: E/AndroidRuntime(11063): at android.content.ContextWrapper.getContentResolver(ContextWrapper.java:90)
03-01 07:55:32.529: E/AndroidRuntime(11063): at com.mycontacts.NativeServices.SendPushMsg(NativeServices.java:68)
03-01 07:55:32.529: E/AndroidRuntime(11063): at com.mycontacts.MyService.initialiseLatestResult(MyService.java:63)
03-01 07:55:32.529: E/AndroidRuntime(11063): at com.red_folder.phonegap.plugin.backgroundservice.BackgroundService.initialiseService(BackgroundService.java:299)
03-01 07:55:32.529: E/AndroidRuntime(11063): at com.red_folder.phonegap.plugin.backgroundservice.BackgroundService.onCreate(BackgroundService.java:129)
03-01 07:55:32.529: E/AndroidRuntime(11063): at android.app.ActivityThread.handleCreateService(ActivityThread.java:1956)
03-01 07:55:32.529: E/AndroidRuntime(11063): ... 10 more
03-01 07:55:32.529: E/AndroidRuntime(11063): [Blue Error Handler] Make Debugging Report file for main
03-01 07:55:32.529: E/AndroidRuntime(11063): java.lang.RuntimeException: Unable to create service com.mycontacts.MyService: java.lang.NullPointerException
03-01 07:55:32.529: E/AndroidRuntime(11063): at android.app.ActivityThread.handleCreateService(ActivityThread.java:1966)
03-01 07:55:32.529: E/AndroidRuntime(11063): at android.app.ActivityThread.access$2500(ActivityThread.java:117)
03-01 07:55:32.529: E/AndroidRuntime(11063): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:996)
03-01 07:55:32.529: E/AndroidRuntime(11063): at android.os.Handler.dispatchMessage(Handler.java:99)
03-01 07:55:32.529: E/AndroidRuntime(11063): at android.os.Looper.loop(Looper.java:130)
03-01 07:55:32.529: E/AndroidRuntime(11063): at android.app.ActivityThread.main(ActivityThread.java:3735)
03-01 07:55:32.529: E/AndroidRuntime(11063): at java.lang.reflect.Method.invokeNative(Native Method)
03-01 07:55:32.529: E/AndroidRuntime(11063): at java.lang.reflect.Method.invoke(Method.java:507)
03-01 07:55:32.529: E/AndroidRuntime(11063): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
03-01 07:55:32.529: E/AndroidRuntime(11063): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:662)
03-01 07:55:32.529: E/AndroidRuntime(11063): at dalvik.system.NativeStart.main(Native Method)
03-01 07:55:32.529: E/AndroidRuntime(11063): Caused by: java.lang.NullPointerException
03-01 07:55:32.529: E/AndroidRuntime(11063): at android.content.ContextWrapper.getContentResolver(ContextWrapper.java:90)
03-01 07:55:32.529: E/AndroidRuntime(11063): at com.mycontacts.NativeServices.SendPushMsg(NativeServices.java:68)
03-01 07:55:32.529: E/AndroidRuntime(11063): at com.mycontacts.MyService.initialiseLatestResult(MyService.java:63)
03-01 07:55:32.529: E/AndroidRuntime(11063): at com.red_folder.phonegap.plugin.backgroundservice.BackgroundService.initialiseService(BackgroundService.java:299)
03-01 07:55:32.529: E/AndroidRuntime(11063): at com.red_folder.phonegap.plugin.backgroundservice.BackgroundService.onCreate(BackgroundService.java:129)
03-01 07:55:32.529: E/AndroidRuntime(11063): at android.app.ActivityThread.handleCreateService(ActivityThread.java:1956)
03-01 07:55:32.529: E/AndroidRuntime(11063): ... 10 more
Android（Java）新手，所以我真的不明白发生了什么
答案 0 :(得分：1)
您可以通过我的代码获取您的联系人姓名和电话号码，如果您想获取图片然后告诉您可以将所有数据保存到对象arraylist并显示到自定义适配器
try {
Cursor phones = getContentResolver().query(
ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
null, null, null, null);
while (phones.moveToNext()) {
//you can define String name and phone number globally use
String name = phones
.getString(phones
.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
Log.d("NAME", name);
String phoneNumber = phones
.getString(phones
.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
}
}
phones.close();
} catch (Exception e) {
}