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,填充數據適配器      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;    }  }  /**   * 獲取聯系人數據的方法   */  private void initData() {    //因為讀取系統聯系人,可能是一個耗時操作,放置到子線程中處理    new Thread(){      public void run(){        //1,獲取內容解析器對象        ContentResolver contentResolver = getContentResolver();        //2,做查詢系統聯系人數據庫表過程(讀取聯系人權限)        Cursor cursor = contentResolver.query(            Uri.parse("content://com.android.contacts/raw_contacts"),            new String[]{"contact_id"},            null, null, null);        contactList.clear();        //3,循環游標,直到沒有數據為止        while (cursor.moveToNext()){          String id = cursor.getString(0);          //4,根據用戶唯一性id值,查詢data表和mimetype表生成的視圖,獲取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,循環獲取每一個聯系人的電話號碼以及姓名,數據類型          HashMap<String, String> hashMap = new HashMap<String, String>();          while (indexCursor.moveToNext()){            String data = indexCursor.getString(0);            String type = indexCursor.getString(1);            //6,區分類型去給hashMap填充數據            if(type.equals("vnd.android.cursor.item/phone_v2")) {              //數據非空判斷              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,消息機制,發送一個空的消息,告知主線程可以去使用子線程已經填充好的數據集合        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,獲取點中條目的索引指向集合中的對象        if(mAdapter != null) {          HashMap<String, String> hashMap = mAdapter.getItem(i);          //2,獲取當前條目指向集合對應的電話號碼          String phone = hashMap.get("phone");          //3,此電話號碼需要給第三個導航界面使用          //4,在結束此界面回到前一個導航界面的時候,需要將數據返回過去          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,返回到當前界面的時候,接受結果的方法      String phone = data.getStringExtra("phone");      //2,將特殊字符過濾(中劃線轉換成空字符串)      phone = phone.replace("-", "").replace(" ", "").trim();      et_phone_number.setText(phone);      //3,存儲聯系人至sp中      SpUtil.putString(getApplicationContext(), ConstantValue.CONTACT_PHONE, phone);    }    super.onActivityResult(requestCode, resultCode, data);  }

  private void initUI() {    //顯示電話號碼的輸入框    et_phone_number = (EditText)findViewById(R.id.et_phone_number);    //獲取聯系人電話號碼回顯過程    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);    //點擊選擇聯系人的對話框    bt_select_number.setOnClickListener(new View.OnClickListener() {      @Override      public void onClick(View view) {        Intent intent = new Intent(getApplicationContext(), ContactListActivity.class);        startActivityForResult(intent, 0);      }    });  }