Android中ViewPager和Fragment实现内容和导航栏的绑定

最新推荐文章于 2019-07-29 14:09:47 发布

原创最新推荐文章于 2019-07-29 14:09:47 发布 · 827 阅读

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文章标签：

#导航 #ViewPager #Fragment

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本文将介绍如何在 Android 应用中利用 ViewPager 和 Fragment 实现页面切换功能，包括初始化 Fragment、设置适配器、导航栏绑定及页面监听等关键步骤。

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页面效果

逻辑代码--MainActivity

package com.example.week4_day4_viewpagerandfragment;

import java.util.ArrayList;
import java.util.List;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MainActivity extends FragmentActivity {

	private ViewPager viewPager;//声明ViewPager
	private List<Fragment> list;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);//加载布局
		viewPager = (ViewPager) findViewById(R.id.viewpager);//得到ViewPager对象
		initFragment();//调用Fragment
		tab();//导航栏
		//绑定适配器
		viewPager
				.setAdapter(new MyFragmentAdapter(getSupportFragmentManager(),list) );
		//导航栏绑定数据源
		viewPager.setOnPageChangeListener(new OnPageChangeListener() {
			
			@Override
			public void onPageSelected(int arg0) {
				for (int i = 0; i < list.size(); i++) {
					tvs[i].setBackgroundColor(Color.BLUE);
				}
				tvs[arg0].setBackgroundColor(Color.YELLOW);
			}
			
			@Override
			public void onPageScrolled(int arg0, float arg1, int arg2) {
				// TODO Auto-generated method stub
				
			}
			
			@Override
			public void onPageScrollStateChanged(int arg0) {
				// TODO Auto-generated method stub
				
			}
		});
	}

	public void initFragment() {
		list = new ArrayList<Fragment>();

		MyFragment fragment1 = new MyFragment();
		Bundle bundle = new Bundle();
		bundle.putInt("index", 1);
		fragment1.setArguments(bundle);

		MyFragment fragment2 = new MyFragment();
		bundle = new Bundle();
		bundle.putInt("index",2);
		fragment2.setArguments(bundle);

		MyFragment fragment3 = new MyFragment();
		bundle = new Bundle();
		bundle.putInt("index", 3);
		fragment3.setArguments(bundle);
		list.add(fragment1);
		list.add(fragment2);
		list.add(fragment3);
	}

	private TextView[] tvs;
	//导航栏
	public void tab(){
		LinearLayout layout=(LinearLayout) findViewById(R.id.linear1);
		tvs=new TextView[3];
		for (int i = 0; i < tvs.length; i++) {
			tvs[i]=(TextView) layout.getChildAt(i);
			tvs[i].setTag(i);
			tvs[i].setBackgroundColor(Color.BLUE);
			tvs[i].setOnClickListener(new OnClickListener() {
				
				@Override
				public void onClick(View v) {
					viewPager.setCurrentItem((Integer) v.getTag());
					
				}
			});
			tvs[0].setBackgroundColor(Color.YELLOW);
		}
	}

}

自定义适配器

package com.example.week4_day4_viewpagerandfragment;

import java.util.List;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;

/**
 * 自定义FragmentPagerAdapter的适配器
 * 专门存放Fragment数据
 * 
 */
public class MyFragmentAdapter extends FragmentPagerAdapter {

	private List<Fragment> list;
	public MyFragmentAdapter(FragmentManager fm,List<Fragment> list) {
		super(fm);
		this.list=list;
	
	}
	/**
	 * 根据指定下标返回对应的Fragment对象
	 */
	@Override
	public Fragment getItem(int arg0) {
	
		return list.get(arg0);
	}
	/**
	 * 适配器中Fragment的数量
	 */
	@Override
	public int getCount() {
		
		return list.size();
	}
	

}

Fragment

package com.example.week4_day4_viewpagerandfragment;

import android.annotation.SuppressLint;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

@SuppressLint("NewApi")
public class MyFragment extends Fragment {

	private TextView tv;

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		Bundle bundle = getArguments();
		View view = inflater.inflate(R.layout.item, null);
		tv = (TextView) view.findViewById(R.id.tv);
		if (bundle != null) {
			int tab = bundle.getInt("index");
			switch (tab) {
			case 1:
				tv.setText("新闻");
				break;
			case 2:
				tv.setText("娱乐");
				break;
			case 3:
				tv.setText("体育");
				break;

			default:
				break;
			}
		}
		return view;
	}
}

界面布局--main

<LinearLayout 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"
    android:orientation="vertical" >

    <LinearLayout
        android:id="@+id/linear1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:text="新闻" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:text="娱乐" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:text="体育" />
    </LinearLayout>

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

界面布局--item

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <TextView 
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:textColor="#ff0000"
        android:textSize="20sp"/>

</RelativeLayout>