AndroidFragment实现底部通知栏

<&＃63;xml version="1.0" encoding="utf-8"&＃63;>






  
  
  

public class MainActivity extends AppCompatActivity {

  private Button btn_contact;
  private Button btn_disc;
  private Button btn_me;
  private Button btn_msg_list;
  private FragmentManager fragmentManager;
  private MsgListFragment msgListFragment;
  private ContactFragment contactFragment;
  private DiscoveryFragment discoveryFragment;
  private MeFragment meFragment;

  private final int STATE_MSG =1;
  private final int STATE_CON =2;
  private final int STATE_DIS =3;
  private final int STATE_ME =4;
  private int currentState;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    initView();
    initData();
    chageButtonColor(currentState,STATE_MSG);
  }

  private void initData() {
    fragmentManager = getFragmentManager();
    switchFragment(this.STATE_MSG);
  }

  private void initView() {
    btn_cOntact= (Button) findViewById(R.id.btn_contact);
    btn_disc = (Button) findViewById(R.id.btn_disc);
    btn_me = (Button) findViewById(R.id.btn_me);
    btn_msg_list = (Button) findViewById(R.id.btn_msg_list);
  }

  public void click(View view) {

    switch (view.getId()){
      case R.id.btn_msg_list:

        switchFragment(this.STATE_MSG);
        break;
      case R.id.btn_contact:
        switchFragment(this.STATE_CON);
        break;

      case R.id.btn_disc:
        switchFragment(this.STATE_DIS);
        break;
      case R.id.btn_me:
        switchFragment(this.STATE_ME);
        break;
    }
  }

  private void switchFragment(int toState) {

    if (toState == currentState)
      return;
    chageButtonColor(currentState,toState);
    this.currentState=toState;

    FragmentTransaction transaction = this.fragmentManager.beginTransaction();

    Fragment fragment=msgListFragment;
    switch (toState){
      case STATE_DIS:
        if (discoveryFragment == null)
          discoveryFragment= new DiscoveryFragment();
        fragment= discoveryFragment;
        break;
      case STATE_ME:
        if (meFragment == null)
          meFragment= new MeFragment();
        fragment= meFragment;
        break;
      case STATE_CON:
        if (cOntactFragment== null)
          cOntactFragment= new ContactFragment();
        fragment= contactFragment;
        break;
      case STATE_MSG:
        if (msgListFragment == null)
          msgListFragment= new MsgListFragment();
        fragment= msgListFragment;
        break;
    }
    transaction.replace(R.id.ll_content_part,fragment);
    transaction.commit();
  }

  private void chageButtonColor(int currentState,int toState){

    switch (currentState){
      case STATE_DIS:
        this.btn_disc.setTextColor(Color.BLACK);
        break;
        case STATE_ME:
          this.btn_me.setTextColor(Color.BLACK);
        break;
      case STATE_CON:
        this.btn_contact.setTextColor(Color.BLACK);
        break;
      case STATE_MSG:
        this.btn_msg_list.setTextColor(Color.BLACK);
        break;
    }
    switch (toState){
      case STATE_DIS:
        this.btn_disc.setTextColor(Color.GREEN);
        break;
      case STATE_ME:
        this.btn_me.setTextColor(Color.GREEN);
        break;
      case STATE_CON:
        this.btn_contact.setTextColor(Color.GREEN);
        break;
      case STATE_MSG:
        this.btn_msg_list.setTextColor(Color.GREEN);
        break;
    }
  }
}