ViewPager实例

最新推荐文章于 2018-07-30 17:41:57 发布

原创最新推荐文章于 2018-07-30 17:41:57 发布 · 1k 阅读

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#android #ViewPager #实例

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目录结构：

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.viewpagertest3"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="15"
        android:targetSdkVersion="15" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.viewpagertest3.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".DetailActivity"></activity>
    </application>
	
</manifest>

MainActivity.java

package com.example.viewpagertest3;

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

import android.app.Activity;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.PagerTabStrip;
import android.support.v4.view.PagerTitleStrip;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;

public class MainActivity extends Activity 
{

	private View view1, view2, view3;//需要滑动的页卡
	private ViewPager viewPager;//viewpager
	private PagerTitleStrip pagerTitleStrip;//viewpager的标题
	private PagerTabStrip pagerTabStrip;//一个viewpager的指示器，效果就是一个横的粗的下划线
	private List<View> viewList;//把需要滑动的页卡添加到这个list中
	private List<String> titleList;//viewpager的标题
	private Button weibo_button;//button对象，一会用来进入第二个Viewpager的示例
    private Intent intent;
	@Override
	public void onCreate(Bundle savedInstanceState) 
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		initView();
	}
      /*在这里需要说明一下，在上面的图片中我们看到了，PagerTabStrip，PagerTitleStrip，他们其实是viewpager的一个指示器，前者效果就是一个横的粗的下划线，后者用来显示各个页卡的标题，当然而这也可以共存。在使用他们的时候需要注意，看下面的布局文件，要在android.support.v4.view.ViewPager里面添加
android.support.v4.view.PagerTabStrip以及android.support.v4.view.PagerTitleStrip。
	*/
	private void initView()
	{
		viewPager = (ViewPager) findViewById(R.id.viewpager);
		//pagerTitleStrip = (PagerTitleStrip) findViewById(R.id.pagertitle);
		pagerTabStrip=(PagerTabStrip) findViewById(R.id.pagertab);
		
		pagerTabStrip.setTabIndicatorColor(Color.YELLOW); 
		pagerTabStrip.setDrawFullUnderline(false);
		pagerTabStrip.setBackgroundColor(Color.GREEN);
		pagerTabStrip.setTextSpacing(50);
		
		/*weibo_button=(Button) findViewById(R.id.button1);
		weibo_button.setOnClickListener(new OnClickListener() {
			
			public void onClick(View v) {
				intent=new Intent(MainActivity.this,DetailActivity.class);
				startActivity(intent);
			}
		});*/
		
		
		view1 = findViewById(R.layout.layout1);
		view2 = findViewById(R.layout.layout2);
		view3 = findViewById(R.layout.layout3);

		LayoutInflater lf = getLayoutInflater().from(this);
		view1 = lf.inflate(R.layout.layout1, null);
		view2 = lf.inflate(R.layout.layout2, null);
		view3 = lf.inflate(R.layout.layout3, null);

		viewList = new ArrayList<View>();// 将要分页显示的View装入数组中
		viewList.add(view1);
		viewList.add(view2);
		viewList.add(view3);

		titleList = new ArrayList<String>();// 每个页面的Title数据
		titleList.add("wp");
		titleList.add("jy");
		titleList.add("jh");

		PagerAdapter pagerAdapter = new PagerAdapter() {

			@Override
			public boolean isViewFromObject(View arg0, Object arg1) {

				return arg0 == arg1;
			}

			@Override
			public int getCount() {

				return viewList.size();
			}

			@Override
			public void destroyItem(ViewGroup container, int position,
					Object object) {
				container.removeView(viewList.get(position));

			}

			@Override
			public int getItemPosition(Object object) {

				return super.getItemPosition(object);
			}

			@Override
			public CharSequence getPageTitle(int position) {

				return titleList.get(position);//直接用适配器来完成标题的显示，所以从上面可以看到，我们没有使用PagerTitleStrip。当然你可以使用。

			}

			@Override
			public Object instantiateItem(ViewGroup container, int position) {
				container.addView(viewList.get(position));
				weibo_button=(Button) findViewById(R.id.button1);//这个需要注意，我们是在重写adapter里面实例化button组件的，如果你在onCreate()方法里这样做会报错的。
				weibo_button.setOnClickListener(new OnClickListener() {
					
					public void onClick(View v) {
						intent=new Intent(MainActivity.this,DetailActivity.class);
						startActivity(intent);
					}
				});
				return viewList.get(position);
			}

		};
		viewPager.setAdapter(pagerAdapter);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu)
	{
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

DetailActivity.java

package com.example.viewpagertest3;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
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.View.OnClickListener;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

public class DetailActivity extends Activity {

	private ViewPager viewPager;//页卡内容
	private ImageView imageView;// 动画图片
	private TextView textView1,textView2,textView3;
	private List<View> views;// Tab页面列表
	private int offset = 0;// 动画图片偏移量
	private int currIndex = 0;// 当前页卡编号
	private int bmpW;// 动画图片宽度
	private View view1,view2,view3;//各个页卡
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.detail);
		InitImageView();
		InitTextView();
		InitViewPager();
	}

	private void InitViewPager() {
		viewPager=(ViewPager) findViewById(R.id.vPager);
		views=new ArrayList<View>();
		LayoutInflater inflater=getLayoutInflater();
		view1=inflater.inflate(R.layout.lay1, null);
		view2=inflater.inflate(R.layout.lay2, null);
		view3=inflater.inflate(R.layout.lay3, null);
		views.add(view1);
		views.add(view2);
		views.add(view3);
		viewPager.setAdapter(new MyViewPagerAdapter(views));
		viewPager.setCurrentItem(0);
		viewPager.setOnPageChangeListener(new MyOnPageChangeListener());
	}
	 /**
	  *  初始化头标
	  */

	private void InitTextView() {
		textView1 = (TextView) findViewById(R.id.text1);
		textView2 = (TextView) findViewById(R.id.text2);
		textView3 = (TextView) findViewById(R.id.text3);

		textView1.setOnClickListener(new MyOnClickListener(0));
		textView2.setOnClickListener(new MyOnClickListener(1));
		textView3.setOnClickListener(new MyOnClickListener(2));
	}

	/**
	 2      * 初始化动画，这个就是页卡滑动时，下面的横线也滑动的效果，在这里需要计算一些数据
	 3 */

	private void InitImageView() {
		imageView= (ImageView) findViewById(R.id.cursor);
		bmpW = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher).getWidth();// 获取图片宽度
		DisplayMetrics dm = new DisplayMetrics();
		getWindowManager().getDefaultDisplay().getMetrics(dm);
		int screenW = dm.widthPixels;// 获取分辨率宽度
		offset = (screenW / 3 - bmpW) / 2;// 计算偏移量
		Matrix matrix = new Matrix();
		matrix.postTranslate(offset, 0);
		imageView.setImageMatrix(matrix);// 设置动画初始位置
	}
	 /** 
	 *     
	 * 头标点击监听 3 */
	private class MyOnClickListener implements OnClickListener{
        private int index=0;
        public MyOnClickListener(int i){
        	index=i;
        }
		public void onClick(View v) {
			viewPager.setCurrentItem(index);			
		}
		
	}
	
	public class MyViewPagerAdapter extends PagerAdapter{
		private List<View> mListViews;
		
		public MyViewPagerAdapter(List<View> mListViews) {
			this.mListViews = mListViews;
		}

		@Override
		public void destroyItem(ViewGroup container, int position, Object object) 	{	
			container.removeView(mListViews.get(position));
		}


		@Override
		public Object instantiateItem(ViewGroup container, int position) {			
			 container.addView(mListViews.get(position), 0);
			 return mListViews.get(position);
		}

		@Override
		public int getCount() {			
			return  mListViews.size();
		}
		
		@Override
		public boolean isViewFromObject(View arg0, Object arg1) {			
			return arg0==arg1;
		}
	}

    public class MyOnPageChangeListener implements OnPageChangeListener{

    	int one = offset * 2 + bmpW;// 页卡1 -> 页卡2 偏移量
		int two = one * 2;// 页卡1 -> 页卡3 偏移量
		public void onPageScrollStateChanged(int arg0) {
			
			
		}

		public void onPageScrolled(int arg0, float arg1, int arg2) {
			
			
		}

		public void onPageSelected(int arg0) {
			/*两种方法，这个是一种，下面还有一种，显然这个比较麻烦
			Animation animation = null;
			switch (arg0) {
			case 0:
				if (currIndex == 1) {
					animation = new TranslateAnimation(one, 0, 0, 0);
				} else if (currIndex == 2) {
					animation = new TranslateAnimation(two, 0, 0, 0);
				}
				break;
			case 1:
				if (currIndex == 0) {
					animation = new TranslateAnimation(offset, one, 0, 0);
				} else if (currIndex == 2) {
					animation = new TranslateAnimation(two, one, 0, 0);
				}
				break;
			case 2:
				if (currIndex == 0) {
					animation = new TranslateAnimation(offset, two, 0, 0);
				} else if (currIndex == 1) {
					animation = new TranslateAnimation(one, two, 0, 0);
				}
				break;
				
			}
			*/
			Animation animation = new TranslateAnimation(one*currIndex, one*arg0, 0, 0);//显然这个比较简洁，只有一行代码。
			currIndex = arg0;
			animation.setFillAfter(true);// True:图片停在动画结束位置
			animation.setDuration(300);
			imageView.startAnimation(animation);
			Toast.makeText(DetailActivity.this, "您选择了"+ viewPager.getCurrentItem()+"页卡", Toast.LENGTH_SHORT).show();
		}
    	
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center" >
              
        <android.support.v4.view.PagerTabStrip  
            android:id="@+id/pagertab"  
            android:layout_width="wrap_content"  
            android:layout_height="wrap_content"  
            android:layout_gravity="top"/>  
         
    </android.support.v4.view.ViewPager>

</LinearLayout>
<!--注意事项:   
    1.这里ViewPager和 PagerTabStrip都要把包名写全了，不然会ClassNotFount  
    2.API中说：在布局xml把PagerTabStrip当做ViewPager的一个子标签来用，不能拿出来，不然还是会报错  
    3.在PagerTabStrip标签中可以用属性android:layout_gravity=TOP|BOTTOM来指定title的位置  
    4.如果要显示出PagerTabStrip某一页的title,需要在ViewPager的adapter中实现getPageTitle(int)-->

detail.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="fill_parent"
        android:layout_height="40.0dip"
        android:background="#FFFFFF" >

        <TextView
            android:id="@+id/text1"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="1.0"
            android:gravity="center"
            android:text=" @我"
            android:textColor="#000000"
            android:textSize="20.0dip" />

        <TextView
            android:id="@+id/text2"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="1.0"
            android:gravity="center"
            android:text="评论"
            android:textColor="#000000"
            android:textSize="20.0dip" />

        <TextView
            android:id="@+id/text3"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="1.0"
            android:gravity="center"
            android:text="私信"
            android:textColor="#000000"
            android:textSize="20.0dip" />
    </LinearLayout>

    <ImageView
        android:id="@+id/cursor"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:scaleType="matrix"
        android:src="@drawable/ic_launcher" />

    <android.support.v4.view.ViewPager
        android:id="@+id/vPager"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:layout_gravity="center"
        android:layout_weight="1.0"
        android:background="#000000"
        android:flipInterval="30"
        android:persistentDrawingCache="animation" />
</LinearLayout>

layout1.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" >
    <Button 
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button"/>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="layout1"/>

</LinearLayout>

layout2.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" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="layout2"/>

</LinearLayout>

其他布局文件类似上面的。

效果如下：

没有增加图片所以不一定好看：

刚进入程序

按Button后