版权声明：本文为博主原创文章，转载请注明出处！ https://blog.csdn.net/ChenMMo/article/details/80867081
安卓的底部菜单 有很多实现方式，本文以RadioGroup 作为 底部单选切换。用fragment 作为页面显示隐藏
初次接触安卓开发，有不对的地方大家交流沟通！
首先是布局文件
我们需要一个FrameLayout 放置 Fragment ，以及RadioGroup 放置底部菜单
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#FFFFFFFF"
android:orientation="vertical" >
<FrameLayout
android:id="@+id/frm_all"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1" >
</FrameLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="1dp"
android:background="@drawable/fbutton_color_emerald"></LinearLayout>
<RadioGroup
android:id="@+id/radiogroup"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:gravity="center_vertical"
android:orientation="horizontal" >
<RadioButton
android:id="@+id/radio_main"
style="@style/main_tab_bottom"
android:layout_weight="1"
android:drawableTop="@drawable/footer_main_selector"
android:text="首 页" />
<RadioButton
android:id="@+id/radio_video"
style="@style/main_tab_bottom"
android:layout_weight="1"
android:drawableTop="@drawable/footer_video_selector"
android:text="视 频" />
<RadioButton
android:id="@+id/radio_new"
style="@style/main_tab_bottom"
android:layout_weight="1"
android:drawableTop="@drawable/footer_new_selector"
android:text="新 闻" />
<RadioButton
android:id="@+id/radio_mycenter"
style="@style/main_tab_bottom"
android:layout_weight="1"
android:drawableTop="@drawable/footer_mycenter_selector"
android:text="我 的" />
</RadioGroup>
</LinearLayout>
</RelativeLayout>布局文件中 引用了 一个Style ,设置一些颜色 字体大小等
<style name="main_tab_bottom">
<item name="android:textSize">12sp</item>
<item name="android:ellipsize">marquee</item>
<item name="android:gravity">center_horizontal</item>
<item name="android:background">#00000000</item>
<item name="android:padding">5dp</item>
<item name="android:layout_width">wrap_content</item>
<item name="android:layout_height">wrap_content</item>
<item name="android:button">@null</item>
<item name="android:singleLine">true</item>
<item name="android:drawablePadding">5dp</item>
<item name="android:layout_weight">1.0</item>
</style>位于drawable 文件夹下边 定义了一个资源文件 设置了选中 和未选中的 样式图片
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:state_focused="true" android:drawable="@drawable/footer_btn_home_preesed" />
<item android:state_pressed="true" android:drawable="@drawable/footer_btn_home_preesed" />
<item android:state_selected="true" android:drawable="@drawable/footer_btn_home_preesed" />
<item android:state_checked="true" android:drawable="@drawable/footer_btn_home_preesed"></item>
<item android:drawable="@mipmap/footer_btn_home" />
</selector>然后就是 activity，设置 RadioGroup 的点击事件。点击后隐藏其他 fragment 显示点击的按钮对应的 利用 FragmentManager 管理fragment
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.RadioGroup;
public class MainActivity extends AppCompatActivity {
private FragmentManager fragmentManager;
private FragmentTransaction fragmentTransaction;
MainFragment mainFragment;
VideoHomeFragment videoFragment;
MyCentent myCenterFragment;
ProHomeFragment proHomeFragment;
SkillHomeFragment skillFragment;
private RadioGroup radiogroup;
private int menuid;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getSupportActionBar().hide();
setContentView(R.layout.activity_main);
// getFragmentManager().beginTransaction().add(R.id.frm_all,new MainFragment()).commit();
fragmentManager = getFragmentManager();
fragmentTransaction = fragmentManager.beginTransaction();
radiogroup = (RadioGroup) findViewById(R.id.radiogroup);
radiogroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
menuid = checkedId;
switch (checkedId) {
case R.id.radio_main:
setChoiceItem(0);
break;
case R.id.radio_mycenter:
setChoiceItem(4);
break;
case R.id.radio_skill:
setChoiceItem(2);
break;
case R.id.radio_pro:
setChoiceItem(3);
break;
case R.id.radio_video:
setChoiceItem(1);
}
}
});
radiogroup.check(R.id.radio_main);
}
public void setChoiceItem(int index) {
fragmentManager = getFragmentManager();
fragmentTransaction = fragmentManager.beginTransaction();
hideFragments(fragmentTransaction);
switch (index) {
case 0:
fragmentTransaction.show(mainFragment);
break;
case 1:
fragmentTransaction.show(videoFragment);
break;
case 2:
fragmentTransaction.show(skillFragment);
break;
case 3:
fragmentTransaction.show(proHomeFragment);
break;
case 4:
fragmentTransaction.show(myCenterFragment);
break;
}
fragmentTransaction.commit();
}
//隐藏所有的Fragment,避免fragment混乱
private void hideFragments(FragmentTransaction transaction) {
if (mainFragment == null) {
mainFragment = new MainFragment();
transaction.add(R.id.frm_all, mainFragment);
}
if (videoFragment == null) {
videoFragment = new VideoHomeFragment();
transaction.add(R.id.frm_all, videoFragment);
}
if (myCenterFragment == null) {
myCenterFragment = new MyCentent();
transaction.add(R.id.frm_all, myCenterFragment);
}
if (skillFragment == null) {
skillFragment = new SkillHomeFragment();
transaction.add(R.id.frm_all, skillFragment);
}
if (proHomeFragment == null) {
proHomeFragment = new ProHomeFragment();
transaction.add(R.id.frm_all, proHomeFragment);
}
transaction.hide(proHomeFragment);
transaction.hide(mainFragment);
transaction.hide(videoFragment);
transaction.hide(skillFragment);
transaction.hide(myCenterFragment);
}
}