Android Fragment實(shí)現(xiàn)底部通知欄，供大家參考，具體內(nèi)容如下

截圖如下：

1. 第一步先要?jiǎng)?chuàng)建fragment（動(dòng)態(tài)注冊(cè)）

然后將兩個(gè)勾選取消掉（還有一種是自己手動(dòng)創(chuàng)建）會(huì)自動(dòng)生成相對(duì)應(yīng)的layout布局，剩下的要根據(jù)自己的需求了

2.在Activity的布局里寫(xiě)好四個(gè)按鈕

這里不是重點(diǎn)…

<?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的代碼

其中定義了四個(gè)整型常量記錄了四個(gè)按鈕的狀態(tài)，還有一個(gè)當(dāng)前狀態(tài)，進(jìn)而判斷當(dāng)前點(diǎn)擊按鈕的狀態(tài)，點(diǎn)擊切換文字顏色和圖標(biāo)每次判斷四個(gè)Fragment的引用是否為空，不為空就不需要每次在new一遍Fragmentreplace每次都會(huì)重新初始化fragment，它是先remove掉相同id的fragment，再add當(dāng)前fragment。add不會(huì)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; } }}

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