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…

<?xml version='1.0' encoding='utf-8'?><RelativeLayout xmlns:android='http://schemas.android.com/apk/res/android' android:layout_width='match_parent' android:layout_height='match_parent' ><LinearLayout android: android:layout_width='match_parent' android:layout_height='match_parent' ></LinearLayout><LinearLayout android: android:layout_alignParentBottom='true' android:orientation='horizontal' android:layout_width='match_parent' android:layout_height='wrap_content'><Button android: android:layout_width='0dp' android:layout_height='wrap_content' android:layout_weight='1' android:textSize='13dp' android:onClick='click' android:text='msg'/> <Button android: android:layout_width='0dp' android:layout_height='wrap_content' android:layout_weight='1' android:textSize='13dp' android:onClick='click' android:text='contact'/> <Button android: android:layout_width='0dp' android:layout_height='wrap_content' android:layout_weight='1' android:textSize='13dp' android:onClick='click' android:text='disc'/> <Button android: android:layout_width='0dp' android:layout_height='wrap_content' android:layout_weight='1' android:textSize='13dp' android:onClick='click' android:text='me'/></LinearLayout></RelativeLayout>

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Fragmentreplace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好吧啦网。