Android App应用底部导航栏实现的一种方式

效果图：



代码实现：LinearLayout + TextView

package com.anyanyan.vmoive.activity;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.TextView;

import com.anyanyan.vmoive.R;
import com.anyanyan.vmoive.fragment.Fragment1;
import com.anyanyan.vmoive.fragment.Fragment2;
import com.anyanyan.vmoive.fragment.Fragment3;
import com.anyanyan.vmoive.fragment.Fragment4;

import butterknife.BindView;
import butterknife.ButterKnife;

public class Main2Activity extends AppCompatActivity implements View.OnClickListener {

@BindView(R.id.tv_tab1)
TextView mTvTab1;
@BindView(R.id.tv_tab2)
TextView mTvTab2;
@BindView(R.id.tv_tab3)
TextView mTvTab3;
@BindView(R.id.tv_tab4)
TextView mTvTab4;
@BindView(R.id.frameLayout)
FrameLayout mFrameLayout;

private Fragment fragment1, fragment2, fragment3, fragment4;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
ButterKnife.bind(this);
initFirst();
bindTabs();
}

private void initFirst() {
mTvTab1.setSelected(true);
if (fragment1 == null) {
fragment1 = new Fragment1();
}
getSupportFragmentManager().beginTransaction().add(R.id.frameLayout, fragment1)
.commitAllowingStateLoss();
}

private void setAllTabNormal() {
mTvTab1.setSelected(false);
mTvTab2.setSelected(false);
mTvTab3.setSelected(false);
mTvTab4.setSelected(false);
}

private void setAllFragmentHide(FragmentTransaction fragmentTransaction) {
if (fragment1 != null) {
fragmentTransaction.hide(fragment1);
}
if (fragment2 != null) {
fragmentTransaction.hide(fragment2);
}
if (fragment3 != null) {
fragmentTransaction.hide(fragment3);
}
if (fragment4 != null) {
fragmentTransaction.hide(fragment4);
}
}

private void bindTabs() {
mTvTab1.setOnClickListener(this);
mTvTab2.setOnClickListener(this);
mTvTab3.setOnClickListener(this);
mTvTab4.setOnClickListener(this);
}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.tv_tab1:
setCurrentTab(1);
break;
case R.id.tv_tab2:
setCurrentTab(2);
break;
case R.id.tv_tab3:
setCurrentTab(3);
break;
case R.id.tv_tab4:
setCurrentTab(4);
break;
}
}

public void setCurrentTab(int tabNo) {
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
setAllTabNormal();
setAllFragmentHide(transaction);
switch (tabNo) {
case 1:
mTvTab1.setSelected(true);
if (fragment1 == null) {
fragment1 = new Fragment1();
transaction.add(R.id.frameLayout, fragment1);
} else {
transaction.show(fragment1);
}
break;
case 2:
mTvTab2.setSelected(true);
if (fragment2 == null) {
fragment2 = new Fragment2();
transaction.add(R.id.frameLayout, fragment2);
} else {
transaction.show(fragment2);
}
break;
case 3:
mTvTab3.setSelected(true);
if (fragment3 == null) {
fragment3 = new Fragment3();
transaction.add(R.id.frameLayout, fragment3);
} else {
transaction.show(fragment3);
}
break;
case 4:
mTvTab4.setSelected(true);
if (fragment4 == null) {
fragment4 = new Fragment4();
transaction.add(R.id.frameLayout, fragment4);
} else {
transaction.show(fragment4);
}
break;
}
transaction.commitAllowingStateLoss();
}
}
布局文件：activity_main2.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xml
bf06
ns: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="com.anyanyan.vmoive.activity.Main2Activity">

<LinearLayout
android:id="@+id/ll_tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_alignParentBottom="true">

<TextView
android:id="@+id/tv_tab1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:drawableTop="@drawable/tab1_menu"
android:text="首页"
android:gravity="center"
android:drawablePadding="6dp"
android:textColor="@drawable/tab1_text_color"/>

<TextView
android:id="@+id/tv_tab2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:drawableTop="@drawable/tab2_menu"
android:text="课程"
android:gravity="center"
android:drawablePadding="6dp"
android:textColor="@drawable/tab1_text_color"/>

<TextView
android:id="@+id/tv_tab3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:drawableTop="@drawable/tab3_menu"
android:text="动态"
android:gravity="center"
android:drawablePadding="6dp"
android:textColor="@drawable/tab1_text_color"/>

<TextView
android:id="@+id/tv_tab4"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:drawableTop="@drawable/tab4_menu"
android:text="我的"
android:gravity="center"
android:drawablePadding="6dp"
android:textColor="@drawable/tab1_text_color"/>

</LinearLayout>
<View
android:id="@+id/divider"
android:layout_width="match_parent"
android:layout_height="2dp"
android:background="@color/tab_normal"
android:layout_above="@id/ll_tabs"/>
<FrameLayout
android:id="@+id/frameLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="@id/divider"/>
</RelativeLayout>TextView的文字颜色设置资源：drawable/tab1_text_color
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_selected="true" android:color="@color/tab_selected"/>
<item android:color = "@color/gray"/>
</selector>在values文件夹中的colors文件中添加：

<color name="tab_selected">#FFEA5651</color>
<color name="tab_normal">@color/gray</color>

TextView的drawableTop资源：drawable/tab1_menu.xml（其他3个依次类推）

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_selected="true" android:drawable="@mipmap/sgk_tab_course_selected"/>
<item android:drawable="@mipmap/sgk_tab_course_normal"/>
</selector>

完成。