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Android ViewPager实例代码介绍2。

2024-07-08 13:33:28   218人阅读

以前写过一篇ViewPager：内容content+指示点的Demo；

这篇文章继续介绍ViewPager：内容content+标题title的Demo。

实现效果图：



源代码：

布局文件：activity_main:

<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=".MainActivity" >

    <android.support.v4.view.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="center" >

        <android.support.v4.view.PagerTitleStrip
            android:id="@+id/pagerTitle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="top" >
        </android.support.v4.view.PagerTitleStrip>
    </android.support.v4.view.ViewPager>

</RelativeLayout>

f1.xml(体育新闻布局文件):

<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=".MainActivity" >

    <RatingBar
        android:id="@+id/ratingBar1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true" />

</RelativeLayout>

f2.xml（娱乐新闻布局文件）:

<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=".MainActivity" >

    <ProgressBar
        android:id="@+id/progressBar1"
        style="?android:attr/progressBarStyleLarge"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="105dp" />

</RelativeLayout>

f3.xml（军事新闻布局文件）：

<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=".MainActivity" >

    <RadioGroup
        android:id="@+id/radioGroup1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="84dp" >

        <RadioButton
            android:id="@+id/radio0"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:checked="true"
            android:text="RadioButton1" />

        <RadioButton
            android:id="@+id/radio1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="RadioButton2" />

        <RadioButton
            android:id="@+id/radio2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="RadioButton3" />
    </RadioGroup>

</RelativeLayout>

代码文件：

MainActivity：

package com.fragmentdemo11_viewpager;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;

public class MainActivity extends Activity {
	private ViewPager viewPager;
	private List<String> title;
	private List<View> content;
	private LayoutInflater inflater;
	private MyViewPagerAdapter adapter;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		viewPager = (ViewPager) findViewById(R.id.viewPager);
		content = new ArrayList<View>();
		inflater = LayoutInflater.from(this);
		/**
		 * 添加内容content
		 */
		content.add(inflater.inflate(R.layout.f1, null));
		content.add(inflater.inflate(R.layout.f2, null));
		content.add(inflater.inflate(R.layout.f3, null));
		
		/**
		 * 添加每个内容对应的标题title
		 */
		title = new ArrayList<String>();
		title.add("体育新闻");
		title.add("娱乐新闻");
		title.add("军事新闻");
		
		adapter = new MyViewPagerAdapter(this,content,title);
		viewPager.setAdapter(adapter);
		
	}
}

ViewPager适配器：

<pre name="code" class="java">package com.fragmentdemo11_viewpager;

import java.util.List;

import android.content.Context;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;
/**
 * ViewPager适配器
 */
public class MyViewPagerAdapter extends PagerAdapter {
	private Context context;
	private List<View> content;
	private List<String> title;

	public MyViewPagerAdapter(Context context, List<View> content,
			List<String> title) {
		this.context = context;
		this.content = content;
		this.title = title;
	}
	/**
	 * 初始化
	 */
	@Override
	public Object instantiateItem(ViewGroup container, int position) {
		((ViewPager)container).addView(content.get(position));
		return content.get(position);
	}
	/**
	 * title
	 */
	@Override
	public CharSequence getPageTitle(int position) {
		return title.get(position);
	}

	@Override
	public int getCount() {
		return content.size();
	}

	@Override
	public boolean isViewFromObject(View arg0, Object arg1) {
		return arg0 == arg1;
	}
	/**
	 * 销毁
	 */
	@Override
	public void destroyItem(ViewGroup container, int position, Object object) {
		((ViewPager)container).removeView(content.get(position));
	}
}



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