底部導航欄實現
阿新 • • 發佈：2019-02-11
底部導航欄我選擇用FragmentTabHost+Fragment來實現，這個方法比較好用，程式碼量也不多
首先是開始的activity_main.xml
也可以直接在xml檔案裡面寫<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="${relativePackage}.${activityClass}" > <FrameLayout android:id="@+id/main_view" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_above="@+id/main_tab" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" > </FrameLayout> <view android:id="@+id/main_tab" android:layout_width="match_parent" android:layout_height="50dp" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" class="android.support.v4.app.FragmentTabHost" /> </RelativeLayout>
<android.support.v4.view.FragmentTabHost >
</android.support.v4.view.FragmentTabHost>
這xml檔案就一個view加一個tab view用來顯示碎片，tab用來放置底部按鈕的數量
再來是tab_foot.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#F6F6F6" android:gravity="center" android:orientation="vertical" > <ImageView android:id="@+id/foot_iv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/home1" /> <TextView android:id="@+id/foot_tv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="3dp" android:text="首頁" android:textColor="@color/tab_color" /> </LinearLayout>
這是每個底部按鈕的佈局設定的xml檔案
再來是MainActivity的程式碼
其中TabDb類是用來設定導航欄的資料和圖片切換時候的資源package com.gjn.mynavigation; import android.os.Bundle; import android.support.v4.app.FragmentActivity; import android.support.v4.app.FragmentTabHost; import android.view.LayoutInflater; import android.view.View; import android.view.Window; import android.widget.ImageView; import android.widget.TabWidget; import android.widget.TextView; import android.widget.TabHost.OnTabChangeListener; import android.widget.TabHost.TabSpec; public class MainActivity extends FragmentActivity implements OnTabChangeListener { private FragmentTabHost mTabHost; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_main); //初始化FragmentTabHost initHost(); //初始化底部導航欄 initTab(); //預設選中 mTabHost.onTabChanged(TabDb.getTabsTxt()[0]); } private void initTab() { String[] tabs = TabDb.getTabsTxt(); for (int i = 0; i < tabs.length; i++) { //新建TabSpec TabSpec tabSpec = mTabHost.newTabSpec(TabDb.getTabsTxt()[i]); //設定view View view = LayoutInflater.from(this).inflate(R.layout.tabs_foot, null); ((TextView) view.findViewById(R.id.foot_tv)).setText(TabDb.getTabsTxt()[i]); ((ImageView) view.findViewById(R.id.foot_iv)).setImageResource(TabDb.getTabsImg()[i]); tabSpec.setIndicator(view); //加入TabSpec mTabHost.addTab(tabSpec,TabDb.getFramgent()[i],null); } } /*** * 初始化Host */ private void initHost() { mTabHost = (FragmentTabHost) findViewById(R.id.main_tab); //呼叫setup方法 設定view mTabHost.setup(this, getSupportFragmentManager(),R.id.main_view); //去除分割線 mTabHost.getTabWidget().setDividerDrawable(null); //監聽事件 mTabHost.setOnTabChangedListener(this); } @Override public void onTabChanged(String arg0) { //從分割線中獲得多少個切換介面 TabWidget tabw = mTabHost.getTabWidget(); for (int i = 0; i < tabw.getChildCount(); i++) { View v = tabw.getChildAt(i); TextView tv = (TextView) v.findViewById(R.id.foot_tv); ImageView iv = (ImageView) v.findViewById(R.id.foot_iv); //修改當前的介面按鈕顏色圖片 if (i == mTabHost.getCurrentTab()) { tv.setTextColor(getResources().getColor(R.color.tab_light_color)); iv.setImageResource(TabDb.getTabsImgLight()[i]); }else{ tv.setTextColor(getResources().getColor(R.color.tab_color)); iv.setImageResource(TabDb.getTabsImg()[i]); } } } }
以下是TabDb類
package com.gjn.mynavigation;
public class TabDb {
/***
* 獲得底部所有項
*/
public static String[] getTabsTxt() {
String[] tabs = {"首頁","交易","地點","我的"};
return tabs;
}
/***
* 獲得所有碎片
*/
public static Class[] getFramgent(){
Class[] cls = {OneFm.class,TwoFm.class,ThreeFm.class,FourFm.class};
return cls ;
}
/***
* 獲得所有點選前的圖片
*/
public static int[] getTabsImg(){
int[] img = {R.drawable.home1,R.drawable.glod1,R.drawable.xc1,R.drawable.user1};
return img ;
}
/***
* 獲得所有點選後的圖片
*/
public static int[] getTabsImgLight(){
int[] img = {R.drawable.home2,R.drawable.glod2,R.drawable.xc2,R.drawable.user2};
return img ;
}
}到此，底部導航欄就算是完全實現了。
現在來實現頂部導航欄，看了許多最後使用了RadioGroup+ViewPager來實現
首先是為第一個碎片設計一個xml佈局：fm_one.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<HorizontalScrollView
android:id="@+id/one_hv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="none" >
<RadioGroup
android:id="@+id/one_rg"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
</RadioGroup>
</HorizontalScrollView>
<view
android:id="@+id/one_view"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
class="android.support.v4.view.ViewPager" />
</LinearLayout>之後是導航欄的每個項的佈局
tab_rb.xml
<?xml version="1.0" encoding="utf-8"?>
<RadioButton xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/tab_rb_selector"
android:button="@null"
android:paddingBottom="10dp"
android:paddingLeft="15dp"
android:paddingRight="15dp"
android:paddingTop="10dp"
android:text="今日" >
</RadioButton>tab_rb_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<!-- 點選 -->
<item android:state_checked="true">
<layer-list >
<item >
<shape android:shape="rectangle">
<stroke android:width="5dp" android:color="@color/tab_light_color"/>
</shape>
</item>
<item android:bottom="5dp">
<shape android:shape="rectangle">
<solid android:color="#fff"/>
</shape>
</item>
</layer-list>
</item>
<!-- 預設 -->
<item >
<shape >
<solid android:color="#fafafa"/>
</shape>
</item>
</selector>最後來實現OneFm類
package com.gjn.mynavigation;
import java.util.ArrayList;
import java.util.List;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.DisplayMetrics;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.HorizontalScrollView;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.LayoutParams;
import android.widget.RadioGroup.OnCheckedChangeListener;
public class OneFm extends Fragment implements OnPageChangeListener {
private View view;
private RadioGroup rg_;
private ViewPager vp_;
private HorizontalScrollView hv_;
private List<Fragment> newsList = new ArrayList<Fragment>();
private OneFmAdapter adapter;
@Override
public View onCreateView(LayoutInflater inflater,
@Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
if (view == null) {
//初始化view
view = inflater.inflate(R.layout.fm_one, container,false);
rg_ = (RadioGroup) view.findViewById(R.id.one_rg);
vp_ = (ViewPager) view.findViewById(R.id.one_view);
hv_ = (HorizontalScrollView) view.findViewById(R.id.one_hv);
//設定RadioGroup點選事件
rg_.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int id) {
vp_.setCurrentItem(id);
}
}
//初始化頂部導航欄
initTab(inflater);
//初始化viewpager
initView();
}
/*
* 底部導航欄切換後 由於沒有銷燬頂部設定導致如果沒有重新設定view
* 導致底部切換後切回頂部頁面資料會消失等bug
* 以下設定每次重新建立view即可
*/
ViewGroup parent = (ViewGroup) view.getParent();
if (parent != null) {
parent.removeView(view);
}
return view;
}
/***
* 初始化viewpager
*/
private void initView() {
List<HTab> hTabs = HTabDb.getSelected();
for (int i = 0; i < hTabs.size(); i++) {
OneFm1 fm1 = new OneFm1();
Bundle bundle = new Bundle();
bundle.putString("name", hTabs.get(i).getName());
fm1.setArguments(bundle);
newsList.add(fm1);
}
//設定viewpager介面卡
adapter = new OneFmAdapter(getActivity().getSupportFragmentManager(),newsList);
vp_.setAdapter(adapter);
//兩個viewpager切換不重新載入
vp_.setOffscreenPageLimit(2);
//設定預設
vp_.setCurrentItem(0);
//設定viewpager監聽事件
vp_.setOnPageChangeListener(this);
}
/***
* 初始化頭部導航欄
* @param inflater
*/
private void initTab(LayoutInflater inflater) {
List<HTab> hTabs = HTabDb.getSelected();
for (int i = 0; i < hTabs.size(); i++) {
//設定頭部項佈局初始化資料
RadioButton rbButton = (RadioButton) inflater.inflate(R.layout.tab_rb, null);
rbButton.setId(i);
rbButton.setText(hTabs.get(i).getName());
LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT);
//加入RadioGroup
rg_.addView(rbButton,params);
}
//預設點選
rg_.check(0);
}
@Override
public void onPageScrollStateChanged(int arg0) {
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageSelected(int id) {
setTab(id);
}
/***
* 頁面跳轉切換頭部偏移設定
* @param id
*/
private void setTab(int id) {
RadioButton rbButton = (RadioButton) rg_.getChildAt(id);
//設定標題被點選
rbButton.setChecked(true);
//偏移設定
int left = rbButton.getLeft();
int width = rbButton.getMeasuredWidth();
DisplayMetrics metrics = new DisplayMetrics();
getActivity().getWindowManager().getDefaultDisplay().getMetrics(metrics);
int screenWidth = metrics.widthPixels;
//移動距離= 左邊的位置 + button寬度的一半 - 螢幕寬度的一半
int len = left + width / 2 - screenWidth / 2;
//移動
hv_.smoothScrollTo(len, 0);
}
}資料類
HTab.java
package com.gjn.mynavigation;
/***
* 頭部Tab屬性
*
*/
public class HTab {
private String name;
public HTab(String name) {
super();
this.setName(name);
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}package com.gjn.mynavigation;
import java.util.ArrayList;
import java.util.List;
public class HTabDb {
private static final List<HTab> Selected = new ArrayList<HTab>();
static{
Selected.add(new HTab("今日"));
Selected.add(new HTab("頭條"));
Selected.add(new HTab("娛樂"));
Selected.add(new HTab("財經"));
Selected.add(new HTab("軍事"));
Selected.add(new HTab("科技"));
Selected.add(new HTab("時尚"));
Selected.add(new HTab("體育"));
}
/***
* 獲得頭部tab的所有項
*/
public static List<HTab> getSelected() {
return Selected;
}
}OneFm1.java
package com.gjn.mynavigation;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class OneFm1 extends Fragment {
private String name;
@Override
public void setArguments(Bundle args) {
name = args.getString("name");
}
@Override
public View onCreateView(LayoutInflater inflater,
@Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment, container,false);
((TextView) view.findViewById(R.id.fm_text)).setText(name);
return view;
}
}最後把fragment.xml貼下，就是每個碎片最預設的顯示頁面
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical" >
<TextView
android:id="@+id/fm_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>