android如何获取电话联系人列表，我这样写错在哪

private ReadNameAndNum rnan;
private Thread t1 ;
@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    callView=View.inflate(this, R.layout.call, null);
    callViewLayer=new LockUtil(this);
    callViewLayer.setLockView(callView);
    callViewLayer.lock();
    callView.findViewById(R.id.callBack).setOnClickListener(this);

    rnan=new ReadNameAndNum();
    t1=new Thread(rnan);
    t1.start();


}
class ReadNameAndNum implements Runnable{
    ContentResolver cr= getContentResolver();
    Cursor c=cr.query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null);
    @Override
    public void run() {
        System.out.println(">>>>>RUN");
        while (c.moveToNext()) {
            int nameFieldColumnIndex= c.getColumnIndex(PhoneLookup.DISPLAY_NAME);
            String contact=c.getString(nameFieldColumnIndex);

            int numberFieldColumnIndex=c.getColumnIndex(PhoneLookup.NUMBER);
            String number=c.getString(numberFieldColumnIndex);

            System.out.println(">>>>>"+contact+">>>>"+number);
        }
        c.close();
    }}

```报错日志
     20:35.177: I/System.out(19335): >>>>>onStart
     03-06 13:20:35.177: I/System.out(19335): >>>>>onResume
      03-06 13:20:37.027: I/System.out(19335): >>>>CallClick
     03-06 13:20:57.297: W/ServiceManager(19335): Permission failure: android.p   ermission.READ_CONTACTS from uid=10104 pid=19335
     03-06 13:20:57.297: E/CheckPermission(19335): Permission Denial: can't read contacts pid=19335, uid=10104
     03-06 13:20:57.307: I/System.out(19335): >>>>>CAllonStart
     03-06 13:20:57.307: I/System.out(19335): >>>>>CAllonResume
     03-06 13:20:57.317: I/System.out(19335): >>>>>RUN
    03-06 13:20:57.317: W/dalvikvm(19335): threadid=16: thread exiting with uncaught exception (group=0x41697898)
     03-06 13:20:57.327: E/AndroidRuntime(19335): FATAL EXCEPTION: Thread-1466
     03-06 13:20:57.327: E/AndroidRuntime(19335): java.lang.NullPointerException
     03-06 13:20:57.327: E/AndroidRuntime(19335):   at com.example.deng_00_lock.AtyCall$ReadNameAndNum.run(AtyCall.java:42)
     03-06 13:20:57.327: E/AndroidRuntime(19335):   at java.lang.Thread.run(Thread.java:841)
     03-06 13:20:57.397: I/Choreographer(19335): Skipped 1207 frames!  The application may be doing too much work on its main thread.

读取权限我也加了，但仍不成功，这里我开了一个线程