本文实例为大家分享了ViewPager+Fragment实现侧滑导航栏的具体代码，供大家参考，具体内容如下
本文主要整理和记录下
本来想用Gif图片，这里暂时就用图片代替下吧：
Activity：
package com.example.administrator.android006;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.LinearLayout;
import com.example.administrator.android006.Fragment.fragment1;
import com.example.administrator.android006.Fragment.fragment2;
import com.example.administrator.android006.Fragment.fragment3;
import com.example.administrator.android006.Fragment.fragment4;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends FragmentActivity implements View.OnClickListener {
//顶部4个按钮
private LinearLayout main_home_layout,main_msg_layout,main_pal_layout,main_me_layout;
private ViewPager main_mViewPager;
//ViewPager的适配器
private FragmentPagerAdapter mAdapter;
//4个Fragment碎片的集合
private List<Fragment> mFragments = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//初始化，加载碎片
initView();
initAdapter();
}
public void initAdapter(){
mAdapter = new FragmentPagerAdapter(getSupportFragmentManager()) {
@Override
public Fragment getItem(int position) {
return mFragments.get(position);
}
@Override
public int getCount() {
return mFragments.size();
}
};
main_mViewPager.setAdapter(mAdapter);
main_mViewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
//重置ImageView的颜色
resetImg();
//设置选中时的图片
switch (position) {
case 0:
((ImageView) main_home_layout.findViewById(R.id.main_home_img))
.setImageResource(R.drawable.home_black);
break;
case 1:
((ImageView) main_msg_layout.findViewById(R.id.main_msg_img))
.setImageResource(R.drawable.msg_black);
break;
case 2:
((ImageView) main_pal_layout.findViewById(R.id.main_pal_img))
.setImageResource(R.drawable.pal_black);
break;
case 3:
((ImageView) main_me_layout.findViewById(R.id.main_me_img))
.setImageResource(R.drawable.me_black);
break;
}
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
}
//重置ImageView的图片
protected void resetImg(){
((ImageView) main_home_layout.findViewById(R.id.main_home_img))
.setImageResource(R.drawable.home_gray);
((ImageView) main_msg_layout.findViewById(R.id.main_msg_img))
.setImageResource(R.drawable.msg_gray);
((ImageView) main_pal_layout.findViewById(R.id.main_pal_img))
.setImageResource(R.drawable.pal_gray);
((ImageView) main_me_layout.findViewById(R.id.main_me_img))
.setImageResource(R.drawable.me_gray);
}
public void initView(){
main_home_layout = findViewById(R.id.main_home_layout);
main_msg_layout = findViewById(R.id.main_msg_layout);
main_pal_layout = findViewById(R.id.main_pal_layout);
main_me_layout = findViewById(R.id.main_me_layout);
main_mViewPager = findViewById(R.id.main_mViewPager);
fragment1 vp_fr1 = new fragment1();
fragment2 vp_fr2 = new fragment2();
fragment3 vp_fr3 = new fragment3();
fragment4 vp_fr4 = new fragment4();
mFragments.add(vp_fr1);
mFragments.add(vp_fr2);
mFragments.add(vp_fr3);
mFragments.add(vp_fr4);
main_home_layout.setOnClickListener(this);
main_msg_layout.setOnClickListener(this);
main_pal_layout.setOnClickListener(this);
main_me_layout.setOnClickListener(this);
}
@Override
public void onClick(View view) {
switch (view.getId()) {
//点击首页时,设置ViewPager的下标为0
case R.id.main_home_layout:
main_mViewPager.setCurrentItem(0);
break;
//点击消息时,设置ViewPager的下标为1
case R.id.main_msg_layout:
main_mViewPager.setCurrentItem(1);
break;
//点击好友时,设置ViewPager的下标为2
case R.id.main_pal_layout:
main_mViewPager.setCurrentItem(2);
break;
//点击我时,设置ViewPager的下标为3
case R.id.main_me_layout:
main_mViewPager.setCurrentItem(3);
break;
}
}
}.xml文件中:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:orientation="horizontal"
>
<LinearLayout
android:id="@+id/main_home_layout"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="vertical"
android:gravity="center"
>
<ImageView
android:id="@+id/main_home_img"
android:layout_width="30dp"
android:layout_height="30dp"
android:src="@drawable/home_black"
android:scaleType="fitXY"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="首页"
/>
</LinearLayout>
<LinearLayout
android:id="@+id/main_msg_layout"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="vertical"
android:gravity="center"
>
<ImageView
android:id="@+id/main_msg_img"
android:layout_width="30dp"
android:layout_height="30dp"
android:src="@drawable/msg_gray"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="消息"
/>
</LinearLayout>
<LinearLayout
android:id="@+id/main_pal_layout"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="vertical"
android:gravity="center"
>
<ImageView
android:id="@+id/main_pal_img"
android:layout_width="30dp"
android:layout_height="30dp"
android:src="@drawable/pal_gray"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="好友"
/>
</LinearLayout>
<LinearLayout
android:id="@+id/main_me_layout"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="vertical"
android:gravity="center"
>
<ImageView
android:id="@+id/main_me_img"
android:layout_width="30dp"
android:layout_height="30dp"
android:src="@drawable/me_gray"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="我"
/>
</LinearLayout>
</LinearLayout>
<android.support.v4.view.ViewPager
android:id="@+id/main_mViewPager"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v4.view.ViewPager>
</LinearLayout>这个是ViewPager中的其中一个Fragment:
public class fragment1 extends Fragment {
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment1,container,false);
}
}其Fragment布局:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="我是Fragment1"
/>
</android.support.constraint.ConstraintLayout>以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程网。
