标签： RadioGroup

Android底部导航栏，三种风格和实现

2021年4月23日
Android, RadioGroup, ViewPager, 底部导航
Android底部导航栏，三种风格和实现已关闭评论

一、效果图展示

%title插图%num

如果动图没有动的话，也可以看下面这个静态图

%title插图%num

以下挨个分析每个的实现，这里只做简单的效果展示，大家可以基于目前代码做二次开发。

二、BottomNavigationView
这是 Google 给我们提供的一个专门用于底部导航的 View，你只需要在新建 Activity 的时候选择 “Bottom Navigation Activity”，IDE 就会自动使用 BottomNavigationView 帮你生成好相应的代码了。

1. 在 xml 中使用
<android.support.design.widget.BottomNavigationView
android:id=”@+id/navigation”
android:layout_width=”0dp”
android:layout_height=”wrap_content”
android:layout_marginEnd=”0dp”
android:layout_marginStart=”0dp”
android:background=”?android:attr/windowBackground”
app:layout_constraintBottom_toBottomOf=”parent”
app:layout_constraintLeft_toLeftOf=”parent”
app:layout_constraintRight_toRightOf=”parent”
app:menu=”@menu/navigation” />
这里面唯一要注意的就是 app:menu 属性了，它指定了你的导航栏显示的页面菜单是怎样的。

2. menu 的布局文件
<?xml version=”1.0″ encoding=”utf-8″?>
<menu xmlns:android=”http://schemas.android.com/apk/res/android”>

</menu>
3. 在 Activity 中调用
private TextView mTextMessage;

private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {

@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.navigation_home:
mTextMessage.setText(R.string.title_home);
return true;
case R.id.navigation_dashboard:
mTextMessage.setText(R.string.title_dashboard);
return true;
case R.id.navigation_notifications:
mTextMessage.setText(R.string.title_notifications);
return true;
}
return false;
}
};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_style1);

mTextMessage = findViewById(R.id.message);
BottomNavigationView navigation = findViewById(R.id.navigation);
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
}
这里的演示 code 都是 IDE 自动生成的，由于 BottomNavigationView 目前我还没有在项目中实际使用过，这里不做过多分析，使用起来不难，以上代码已经足以满足我们的基本使用要求了。

三、RadioGroup + ViewPager
这是一种比较常见了的，下面 4 个 tab 的导航按钮，可以切换不同的页面，这里页面使用了 ViewPager + Fragment 的组合，实现了滑动的页面效果，也可以不使用 ViewPager，这个根据产品的定义来使用即可。

1. 布局文件
<?xml version=”1.0″ encoding=”utf-8″?>
<RelativeLayout xmlns:android=”http://schemas.android.com/apk/res/android”
xmlns:tools=”http://schemas.android.com/tools”
android:layout_width=”match_parent”
android:layout_height=”match_parent”
tools:context=”.style2.Style2Activity”>

<android.support.v4.view.ViewPager
android:id=”@+id/fragment_vp”
android:layout_width=”match_parent”
android:layout_height=”match_parent”
android:layout_above=”@+id/tabs_rg” />

<RadioButton
android:id=”@+id/settings_tab”
style=”@style/Custom.TabRadioButton”
android:drawableTop=”@drawable/tab_setting_selector”
android:text=”设置” />
</RadioGroup>
</RelativeLayout>
2. Activity 类
public class Style2Activity extends AppCompatActivity {

private ViewPager mViewPager;
private RadioGroup mTabRadioGroup;

private List<Fragment> mFragments;
private FragmentPagerAdapter mAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_style2);
initView();
}

private void initView() {
// find view
mViewPager = findViewById(R.id.fragment_vp);
mTabRadioGroup = findViewById(R.id.tabs_rg);
// init fragment
mFragments = new ArrayList<>(4);
mFragments.add(BlankFragment.newInstance(“今日”));
mFragments.add(BlankFragment.newInstance(“记录”));
mFragments.add(BlankFragment.newInstance(“通讯录”));
mFragments.add(BlankFragment.newInstance(“设置”));
// init view pager
mAdapter = new MyFragmentPagerAdapter(getSupportFragmentManager(), mFragments);
mViewPager.setAdapter(mAdapter);
// register listener
mViewPager.addOnPageChangeListener(mPageChangeListener);
mTabRadioGroup.setOnCheckedChangeListener(mOnCheckedChangeListener);
}

@Override
protected void onDestroy() {
super.onDestroy();
mViewPager.removeOnPageChangeListener(mPageChangeListener);
}

private ViewPager.OnPageChangeListener mPageChangeListener = new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

}

@Override
public void onPageSelected(int position) {
RadioButton radioButton = (RadioButton) mTabRadioGroup.getChildAt(position);
radioButton.setChecked(true);
}

@Override
public void onPageScrollStateChanged(int state) {

}
};

private RadioGroup.OnCheckedChangeListener mOnCheckedChangeListener = new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
for (int i = 0; i < group.getChildCount(); i++) {
if (group.getChildAt(i).getId() == checkedId) {
mViewPager.setCurrentItem(i);
return;
}
}
}
};

private class MyFragmentPagerAdapter extends FragmentPagerAdapter {

private List<Fragment> mList;

public MyFragmentPagerAdapter(FragmentManager fm, List<Fragment> list) {
super(fm);
this.mList = list;
}

@Override
public Fragment getItem(int position) {
return this.mList == null ? null : this.mList.get(position);
}

@Override
public int getCount() {
return this.mList == null ? 0 : this.mList.size();
}
}

}
这里唯一注意点的就是两个监听事件，要实现底部导航按钮和页面的联动。

四、带页面跳转功能的底部导航
很多 APP 的底部导航栏中间有一个很大的按钮，点击后通常是打开一个新的页面，这里我们要实现的就是这种底部导航。
依旧是使用 RadioGroup 来做，只不过中间一个 tab 我们先用一个空的 View 来占位，然后在这个 View 的位置放置一个较大的按钮来覆盖住。

<ImageView
android:id=”@+id/sign_iv”
android:layout_width=”80dp”
android:layout_height=”80dp”
android:layout_alignParentBottom=”true”
android:layout_centerHorizontal=”true”
android:background=”@android:color/transparent”
android:src=”@mipmap/sign” />
</RelativeLayout>
2. Activity 类
public class Style3Activity extends AppCompatActivity {

private RadioGroup mTabRadioGroup;
private SparseArray<Fragment> mFragmentSparseArray;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_style3);
initView();
}

private void initView() {
mTabRadioGroup = findViewById(R.id.tabs_rg);
mFragmentSparseArray = new SparseArray<>();
mFragmentSparseArray.append(R.id.today_tab, BlankFragment.newInstance(“今日”));
mFragmentSparseArray.append(R.id.record_tab, BlankFragment.newInstance(“记录”));
mFragmentSparseArray.append(R.id.contact_tab, BlankFragment.newInstance(“通讯录”));
mFragmentSparseArray.append(R.id.settings_tab, BlankFragment.newInstance(“设置”));
mTabRadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// 具体的fragment切换逻辑可以根据应用调整，例如使用show()/hide()
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
mFragmentSparseArray.get(checkedId)).commit();
}
});
// 默认显示*个
getSupportFragmentManager().beginTransaction().add(R.id.fragment_container,
mFragmentSparseArray.get(R.id.today_tab)).commit();
findViewById(R.id.sign_iv).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(Style3Activity.this, SignActivity.class));
}
});
}

}
注意：

如果这里你也想使用 ViewPager 来展示 Fragment 的话，一定要注意这里的 RadioGroup 中间有一个占位的 View，即两者的监听事件里，实现联动时要考虑多个这个 View 的存在。

TabHost与RadioGroup结合完成的菜单

2021年4月12日
RadioGroup, TabHost
TabHost与RadioGroup结合完成的菜单已关闭评论

效果图:

首先看布局文件：

Java代码

<?xml version=“1.0” encoding=“UTF-8”?>
<TabHost android:id=“@android:id/tabhost” android:layout_width=“fill_parent” android:layout_height=“fill_parent”
xmlns:android=“http://schemas.android.com/apk/res/android”>
<LinearLayout
android:orientation=“vertical”
android:layout_width=“fill_parent”
android:layout_height=“fill_parent”>
<FrameLayout
android:id=“@android:id/tabcontent”
android:layout_width=“fill_parent”
android:layout_height=“0.0dip”
android:layout_weight=“1.0” />
<TabWidget
android:id=“@android:id/tabs”
android:visibility=“gone”
android:layout_width=“fill_parent”
android:layout_height=“wrap_content”
android:layout_weight=“0.0” />
<RadioGroup
android:gravity=“center_vertical”
android:layout_gravity=“bottom”
android:orientation=“horizontal”
android:id=“@+id/main_radio”
android:background=“@drawable/maintab_toolbar_bg”
android:layout_width=“fill_parent”
android:layout_height=“wrap_content”>
<RadioButton
android:id=“@+id/radio_button0”
android:tag=“radio_button0”
android:layout_marginTop=“2.0dip”
android:text=“@string/alarm”
android:drawableTop=“@drawable/icon_1”
style=“@style/main_tab_bottom” />
<RadioButton
android:id=“@+id/radio_button1”
android:tag=“radio_button1”
android:layout_marginTop=“2.0dip”
android:text=“@string/message”
android:drawableTop=“@drawable/icon_2”
style=“@style/main_tab_bottom” />
<RadioButton
android:id=“@+id/radio_button2”
android:tag=“radio_button2”
android:layout_marginTop=“2.0dip”
android:text=“@string/photo”
android:drawableTop=“@drawable/icon_3”
style=“@style/main_tab_bottom” />
<RadioButton
android:id=“@+id/radio_button3”
android:tag=“radio_button3”
android:layout_marginTop=“2.0dip”
android:text=“@string/music”
android:drawableTop=“@drawable/icon_4”
style=“@style/main_tab_bottom” />
<RadioButton
android:id=“@+id/radio_button4”
android:tag=“radio_button4”
android:layout_marginTop=“2.0dip”
android:text=“@string/setting”
android:drawableTop=“@drawable/icon_5”
style=“@style/main_tab_bottom” />
</RadioGroup>
</LinearLayout>
</TabHost>

[java] view plain copy

<?xml version=“1.0” encoding=“UTF-8”?>
<TabHost android:id=“@android:id/tabhost” android:layout_width=“fill_parent” android:layout_height=“fill_parent”
xmlns:android=“http://schemas.android.com/apk/res/android”>
<LinearLayout
android:orientation=“vertical”
android:layout_width=“fill_parent”
android:layout_height=“fill_parent”>
<FrameLayout
android:id=“@android:id/tabcontent”
android:layout_width=“fill_parent”
android:layout_height=“0.0dip”
android:layout_weight=“1.0” />
<TabWidget
android:id=“@android:id/tabs”
android:visibility=“gone”
android:layout_width=“fill_parent”
android:layout_height=“wrap_content”
android:layout_weight=“0.0” />
<RadioGroup
android:gravity=“center_vertical”
android:layout_gravity=“bottom”
android:orientation=“horizontal”
android:id=“@+id/main_radio”
android:background=“@drawable/maintab_toolbar_bg”
android:layout_width=“fill_parent”
android:layout_height=“wrap_content”>
<RadioButton
android:id=“@+id/radio_button0”
android:tag=“radio_button0”
android:layout_marginTop=“2.0dip”
android:text=“@string/alarm”
android:drawableTop=“@drawable/icon_1”
style=“@style/main_tab_bottom” />
<RadioButton
android:id=“@+id/radio_button1”
android:tag=“radio_button1”
android:layout_marginTop=“2.0dip”
android:text=“@string/message”
android:drawableTop=“@drawable/icon_2”
style=“@style/main_tab_bottom” />
<RadioButton
android:id=“@+id/radio_button2”
android:tag=“radio_button2”
android:layout_marginTop=“2.0dip”
android:text=“@string/photo”
android:drawableTop=“@drawable/icon_3”
style=“@style/main_tab_bottom” />
<RadioButton
android:id=“@+id/radio_button3”
android:tag=“radio_button3”
android:layout_marginTop=“2.0dip”
android:text=“@string/music”
android:drawableTop=“@drawable/icon_4”
style=“@style/main_tab_bottom” />
<RadioButton
android:id=“@+id/radio_button4”
android:tag=“radio_button4”
android:layout_marginTop=“2.0dip”
android:text=“@string/setting”
android:drawableTop=“@drawable/icon_5”
style=“@style/main_tab_bottom” />
</RadioGroup>
</LinearLayout>
</TabHost>

需要注意的是，如果用TabHost这个控件，其中有几个ID是必须这么写的，android:id=”@android:id/tabhost ；android:id=”@android:id/tabcontent” ；android:id=”@android:id/tabs” ；之所以要这么写是因为在TabHost这个类中。需要实例化上述这个ID的控件。看源码：

在TabActivity中有么个方法：

@Override
public void onContentChanged() {
super.onContentChanged();
mTabHost = (TabHost) findViewById(com.android.internal.R.id.tabhost);
if (mTabHost == null) {
throw new RuntimeException(
“Your content must have a TabHost whose id attribute is “ +
“‘android.R.id.tabhost'”);
}
mTabHost.setup(getLocalActivityManager());
}
private void ensureTabHost() {
if (mTabHost == null) {
this.setContentView(com.android.internal.R.layout.tab_content);
}
}

[java] view plain copy

@Override
public void onContentChanged() {
super.onContentChanged();
mTabHost = (TabHost) findViewById(com.android.internal.R.id.tabhost);
if (mTabHost == null) {
throw new RuntimeException(
“Your content must have a TabHost whose id attribute is “ +
“‘android.R.id.tabhost'”);
}
mTabHost.setup(getLocalActivityManager());
}
private void ensureTabHost() {
if (mTabHost == null) {
this.setContentView(com.android.internal.R.layout.tab_content);
}
}

当内容发生改变时它会调用这个方法，来更新列表或者其他视图，而这个方法中需要实例化TabHost，所以必须通过ID为tabhost实例化。

再看看TabHost这个类中，

Java代码

public void setup() {
mTabWidget = (TabWidget) findViewById(com.android.internal.R.id.tabs);
if (mTabWidget == null) {
throw new RuntimeException(
“Your TabHost must have a TabWidget whose id attribute is ‘android.R.id.tabs'”);
}
// KeyListener to attach to all tabs. Detects non-navigation keys
// and relays them to the tab content.
mTabKeyListener = new OnKeyListener() {
public boolean onKey(View v, int keyCode, KeyEvent event) {
switch (keyCode) {
case KeyEvent.KEYCODE_DPAD_CENTER:
case KeyEvent.KEYCODE_DPAD_LEFT:
case KeyEvent.KEYCODE_DPAD_RIGHT:
case KeyEvent.KEYCODE_DPAD_UP:
case KeyEvent.KEYCODE_DPAD_DOWN:
case KeyEvent.KEYCODE_ENTER:
return false;
}
mTabContent.requestFocus(View.FOCUS_FORWARD);
return mTabContent.dispatchKeyEvent(event);
}
};
mTabWidget.setTabSelectionListener(new TabWidget.OnTabSelectionChanged() {
public void onTabSelectionChanged(int tabIndex, boolean clicked) {
setCurrentTab(tabIndex);
if (clicked) {
mTabContent.requestFocus(View.FOCUS_FORWARD);
}
}
});
mTabContent = (FrameLayout) findViewById(com.android.internal.R.id.tabcontent);
if (mTabContent == null) {
throw new RuntimeException(
“Your TabHost must have a FrameLayout whose id attribute is “
+ “‘android.R.id.tabcontent'”);
}
}

[java] view plain copy

public void setup() {
mTabWidget = (TabWidget) findViewById(com.android.internal.R.id.tabs);
if (mTabWidget == null) {
throw new RuntimeException(
“Your TabHost must have a TabWidget whose id attribute is ‘android.R.id.tabs'”);
}
// KeyListener to attach to all tabs. Detects non-navigation keys
// and relays them to the tab content.
mTabKeyListener = new OnKeyListener() {
public boolean onKey(View v, int keyCode, KeyEvent event) {
switch (keyCode) {
case KeyEvent.KEYCODE_DPAD_CENTER:
case KeyEvent.KEYCODE_DPAD_LEFT:
case KeyEvent.KEYCODE_DPAD_RIGHT:
case KeyEvent.KEYCODE_DPAD_UP:
case KeyEvent.KEYCODE_DPAD_DOWN:
case KeyEvent.KEYCODE_ENTER:
return false;
}
mTabContent.requestFocus(View.FOCUS_FORWARD);
return mTabContent.dispatchKeyEvent(event);
}
};
mTabWidget.setTabSelectionListener(new TabWidget.OnTabSelectionChanged() {
public void onTabSelectionChanged(int tabIndex, boolean clicked) {
setCurrentTab(tabIndex);
if (clicked) {
mTabContent.requestFocus(View.FOCUS_FORWARD);
}
}
});
mTabContent = (FrameLayout) findViewById(com.android.internal.R.id.tabcontent);
if (mTabContent == null) {
throw new RuntimeException(
“Your TabHost must have a FrameLayout whose id attribute is “
+ “‘android.R.id.tabcontent'”);
}
}

这个方法，是在增加选项卡之前由系统调用。在这个方法中需要通过tabs 这个ID实例化一个TabWidget，通过tabcontent这个ID实例化一个FrameLayout，用来放置选项卡内容。所以这两个ID也是固定的。

在上述布局文件中隐藏了系统默认的Widget，取而代之的是带有图片的Button。

看一下主要代码：

Java代码

package com.iteye.androidtoast;
import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TabHost;
public class MainActivity extends TabActivity implements OnCheckedChangeListener{
/** Called when the activity is first created. */
private TabHost mHost;
private RadioGroup radioderGroup;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.maintabs);
//实例化TabHost
mHost=this.getTabHost();
//添加选项卡
mHost.addTab(mHost.newTabSpec(“ONE”).setIndicator(“ONE”)
.setContent(new Intent(this,OneActivity.class)));
mHost.addTab(mHost.newTabSpec(“TWO”).setIndicator(“TWO”)
.setContent(new Intent(this,TwoActivity.class)));
mHost.addTab(mHost.newTabSpec(“THREE”).setIndicator(“THREE”)
.setContent(new Intent(this,ThreeActivity.class)));
mHost.addTab(mHost.newTabSpec(“FOUR”).setIndicator(“FOUR”)
.setContent(new Intent(this,FourActivity.class)));
mHost.addTab(mHost.newTabSpec(“FIVE”).setIndicator(“FIVE”)
.setContent(new Intent(this,FiveActivity.class)));
radioderGroup = (RadioGroup) findViewById(R.id.main_radio);
radioderGroup.setOnCheckedChangeListener(this);
}
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
switch(checkedId){
case R.id.radio_button0:
mHost.setCurrentTabByTag(“ONE”);
break;
case R.id.radio_button1:
mHost.setCurrentTabByTag(“TWO”);
break;
case R.id.radio_button2:
mHost.setCurrentTabByTag(“THREE”);
break;
case R.id.radio_button3:
mHost.setCurrentTabByTag(“FOUR”);
break;
case R.id.radio_button4:
mHost.setCurrentTabByTag(“FIVE”);
break;
}
}
}

[java] view plain copy

package com.iteye.androidtoast;
import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TabHost;
public class MainActivity extends TabActivity implements OnCheckedChangeListener{
/** Called when the activity is first created. */
private TabHost mHost;
private RadioGroup radioderGroup;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.maintabs);
//实例化TabHost
mHost=this.getTabHost();
//添加选项卡
mHost.addTab(mHost.newTabSpec(“ONE”).setIndicator(“ONE”)
.setContent(new Intent(this,OneActivity.class)));
mHost.addTab(mHost.newTabSpec(“TWO”).setIndicator(“TWO”)
.setContent(new Intent(this,TwoActivity.class)));
mHost.addTab(mHost.newTabSpec(“THREE”).setIndicator(“THREE”)
.setContent(new Intent(this,ThreeActivity.class)));
mHost.addTab(mHost.newTabSpec(“FOUR”).setIndicator(“FOUR”)
.setContent(new Intent(this,FourActivity.class)));
mHost.addTab(mHost.newTabSpec(“FIVE”).setIndicator(“FIVE”)
.setContent(new Intent(this,FiveActivity.class)));
radioderGroup = (RadioGroup) findViewById(R.id.main_radio);
radioderGroup.setOnCheckedChangeListener(this);
}
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
switch(checkedId){
case R.id.radio_button0:
mHost.setCurrentTabByTag(“ONE”);
break;
case R.id.radio_button1:
mHost.setCurrentTabByTag(“TWO”);
break;
case R.id.radio_button2:
mHost.setCurrentTabByTag(“THREE”);
break;
case R.id.radio_button3:
mHost.setCurrentTabByTag(“FOUR”);
break;
case R.id.radio_button4:
mHost.setCurrentTabByTag(“FIVE”);
break;
}
}
}

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