private ListView lv_contact;    private List<HashMap<String, String>> contactList = new ArrayList<HashMap<String, String>>();    private MyAdapter mAdapter;    private Handler mHandler = new Handler() {        @Override        public void handleMessage(Message msg) {            //8,填充数据适配器            mAdapter = new MyAdapter();            lv_contact.setAdapter(mAdapter);        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_contact_list);        initUI();        initData();    }    class MyAdapter extends BaseAdapter{        @Override        public int getCount() {            return contactList.size();        }        @Override        public HashMap<String, String> getItem(int i) {            return contactList.get(i);        }        @Override        public long getItemId(int i) {            return i;        }        @Override        public View getView(int i, View view, ViewGroup viewGroup) {            View v = View.inflate(getApplicationContext(), R.layout.listview_contact_item, null);            TextView tv_name = (TextView)v.findViewById(R.id.tv_name);            TextView tv_phone = (TextView)v.findViewById(R.id.tv_phone);            tv_name.setText(getItem(i).get("name"));            tv_phone.setText(getItem(i).get("phone"));            return v;        }    }    /**     *  获取联系人数据的方法     */    private void initData() {        //因为读取系统联系人,可能是一个耗时操作,放置到子线程中处理        new Thread(){            public void run(){                //1,获取内容解析器对象                ContentResolver contentResolver = getContentResolver();                //2,做查询系统联系人数据库表过程(读取联系人权限)                Cursor cursor = contentResolver.query(                        Uri.parse("content://com.android.contacts/raw_contacts"),                        new String[]{"contact_id"},                        null, null, null);                contactList.clear();                //3,循环游标,直到没有数据为止                while (cursor.moveToNext()){                    String id = cursor.getString(0);                    //4,根据用户唯一性id值,查询data表和mimetype表生成的视图,获取data以及mimetype字段                    Cursor indexCursor = contentResolver.query(                            Uri.parse("content://com.android.contacts/data"),                            new String[]{"data1","mimetype"},                            "raw_contact_id = ?", new String[]{id}, null);                    //5,循环获取每一个联系人的电话号码以及姓名,数据类型                    HashMap<String, String> hashMap = new HashMap<String, String>();                    while (indexCursor.moveToNext()){                        String data = indexCursor.getString(0);                        String type = indexCursor.getString(1);                        //6,区分类型去给hashMap填充数据                        if(type.equals("vnd.android.cursor.item/phone_v2")) {                            //数据非空判断                            if(!TextUtils.isEmpty(data)) {                                hashMap.put("phone", data);                            }                        }else if(type.equals("vnd.android.cursor.item/name")) {                            if(!TextUtils.isEmpty(data)) {                                hashMap.put("name", data);                            }                        }                    }                    indexCursor.close();                    contactList.add(hashMap);                }                cursor.close();                //7,消息机制,发送一个空的消息,告知主线程可以去使用子线程已经填充好的数据集合                mHandler.sendEmptyMessage(0);            }        }.start();    }

    private void initUI() {        lv_contact = (ListView) findViewById(R.id.lv_contact);        lv_contact.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {                //1,获取点中条目的索引指向集合中的对象                if(mAdapter != null) {                    HashMap<String, String> hashMap = mAdapter.getItem(i);                    //2,获取当前条目指向集合对应的电话号码                    String phone =  hashMap.get("phone");                    //3,此电话号码需要给第三个导航界面使用                    //4,在结束此界面回到前一个导航界面的时候,需要将数据返回过去                    Intent intent = new Intent();                    intent.putExtra("phone", phone);                    setResult(0, intent);                    finish();                }            }        });    }

    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        if(data != null) {            //1,返回到当前界面的时候,接受结果的方法            String phone = data.getStringExtra("phone");            //2,将特殊字符过滤(中划线转换成空字符串)            phone = phone.replace("-", "").replace(" ", "").trim();            et_phone_number.setText(phone);            //3,存储联系人至sp中            SpUtil.putString(getApplicationContext(), ConstantValue.CONTACT_PHONE, phone);        }        super.onActivityResult(requestCode, resultCode, data);    }

    private void initUI() {        //显示电话号码的输入框        et_phone_number = (EditText)findViewById(R.id.et_phone_number);        //获取联系人电话号码回显过程        String contact_phone = SpUtil.getString(this, ConstantValue.CONTACT_PHONE, "");        et_phone_number.setText(contact_phone);        bt_select_number = (Button) findViewById(R.id.bt_select_number);       //点击选择联系人的对话框        bt_select_number.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Intent intent = new Intent(getApplicationContext(), ContactListActivity.class);                startActivityForResult(intent, 0);            }        });    }