Android动态导航栏的代码实现

package com.example.outlier.test; import android.os.Bundle; import android.os.Handler; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentTransaction; import android.support.v4.content.ContextCompat; import android.support.v7.app.ActionBar; import android.support.v7.app.AppCompatActivity; import android.util.Log; import java.util.ArrayList; import com.aurelhubert.ahbottomnavigation.AHBottomNavigation; import com.aurelhubert.ahbottomnavigation.AHBottomNavigationItem; public class MainActivity extends AppCompatActivity { //这个变量表明当前是否处于登陆状态 private static boolean stateLogged = false; public static boolean getStateLogged() { return stateLogged; } public static void setStateLogged(boolean i) { stateLogged = i; } //定义Fragement对象 private Fragment fg1; private Fragment fg2; private Fragment fg3; private Fragment fg4; // 定义FragmentManager对象管理器 private FragmentManager fragmentManager; private ArrayList<AHBottomNavigationItem> bottomNavigationItems = new ArrayList<>(); private Handler handler = new Handler(); // UI private AHBottomNavigation bottomNavigation; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ActionBar actionBar = getSupportActionBar(); if (actionBar != null) { actionBar.hide(); } fragmentManager = getSupportFragmentManager(); setChioceItem(0); initUI(); action(); } @Override protected void onDestroy() { super.onDestroy(); handler.removeCallbacksAndMessages(null); } /** * Init UI */ private void initUI() { bottomNavigation = (AHBottomNavigation) findViewById(R.id.bottom_navigation); AHBottomNavigationItem item1 = new AHBottomNavigationItem(R.string.tab_1, R.drawable.buttonhome_06, R.color.color_tab_1); AHBottomNavigationItem item2 = new AHBottomNavigationItem(R.string.tab_2, R.drawable.buttonhome_08, R.color.color_tab_2); AHBottomNavigationItem item3 = new AHBottomNavigationItem(R.string.tab_3, R.drawable.buttonhome_11, R.color.color_tab_1); AHBottomNavigationItem item4 = new AHBottomNavigationItem(getString(R.string.tab_4), ContextCompat.getDrawable(this, R.drawable.buttonhome_03), ContextCompat.getColor(this, R.color.color_tab_2)); bottomNavigationItems.add(item1); bottomNavigationItems.add(item2); bottomNavigationItems.add(item3); bottomNavigationItems.add(item4); bottomNavigation.addItems(bottomNavigationItems); bottomNavigation.setTranslucentNavigationEnabled(true); bottomNavigation.setOnTabSelectedListener(new AHBottomNavigation.OnTabSelectedListener() { @Override public boolean onTabSelected(int position, boolean wasSelected) { switch (position) { case 0: setChioceItem(0); break; case 1: setChioceItem(1); break; case 2: setChioceItem(2); break; case 3: setChioceItem(3); break; default: break; } return true; } }); } public void action() { bottomNavigation.setColored(true); bottomNavigation.restoreBottomNavigation(true); bottomNavigation.setSelectedBackgroundVisible(true); AHBottomNavigation.TitleState state = AHBottomNavigation.TitleState.ALWAYS_SHOW; bottomNavigation.setTitleState(state); } /** * 设置点击选项卡的事件处理 * * @param index 选项卡的标号：0, 1, 2, 3 */ private void setChioceItem(int index) { FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); hideFragments(fragmentTransaction); switch (index) { case 0: // firstImage.setImageResource(R.drawable.XXXX); 需要的话自行修改 // firstLayout.setBackgroundColor(gray); // 如果fg1为空，则创建一个并添加到界面上 if (fg1 == null) { fg1 = new FirstFragment(); Log.e("", "" + fg1); fragmentTransaction.add(R.id.content, fg1); } else { // 如果不为空，则直接将它显示出来 fragmentTransaction.show(fg1); } break; case 1: if (fg2 == null) { fg2 = new SecondPage(); fragmentTransaction.add(R.id.content, fg2); } else { fragmentTransaction.show(fg2); } break; case 2: // thirdImage.setImageResource(R.drawable.XXXX); // thirdLayout.setBackgroundColor(gray); if (fg3 == null) { fg3 = new ThirdFragment(); fragmentTransaction.add(R.id.content, fg3); } else { fragmentTransaction.show(fg3); } break; case 3: // fourthImage.setImageResource(R.drawable.XXXX); // fourthLayout.setBackgroundColor(gray); if (fg4 == null) { fg4 = new FourthFragment(); fragmentTransaction.add(R.id.content, fg4); } else { fragmentTransaction.show(fg4); } break; } fragmentTransaction.commit(); // 提交 } /** * 隐藏Fragment * * @param fragmentTransaction */ private void hideFragments(FragmentTransaction fragmentTransaction) { if (fg1 != null) { fragmentTransaction.hide(fg1); } if (fg3 != null) { fragmentTransaction.hide(fg3); } if (fg2 != null) { fragmentTransaction.hide(fg2); } if (fg4 != null) { fragmentTransaction.hide(fg4); } } }