Android Fragment实现底部通知栏

Android Fragment实现底部通知栏，供大家参考，具体内容如下

截图如下：

1. 第一步先要创建fragment（动态注册）

然后将两个勾选取消掉（还有一种是自己手动创建）
会自动生成相对应的layout布局，剩下的要根据自己的需求了

2.在Activity的布局里写好四个按钮

这里不是重点…

3.Activity的代码

其中定义了四个整型常量记录了四个按钮的状态，还有一个当前状态，进而判断当前点击按钮的状态，点击切换文字颜色和图标
每次判断四个Fragment的引用是否为空，不为空就不需要每次在new一遍Fragment
replace每次都会重新初始化fragment，它是先remove掉相同id的fragment，再add当前fragment。
add不会回每次都初始化fragment，一般配合hide()和show()方法

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;
    }
  }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。