android ViewPager 例子

<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" > <LinearLayout android:id="@+id/top_ly" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" > <TextView android:id="@+id/textView1" android:layout_weight="1" android:layout_width="wrap_content" android:layout_height="50dp" android:background="#999999" android:gravity="center" android:text="页面1" android:textColor="#222222" /> <TextView android:id="@+id/textView2" android:layout_weight="1" android:layout_width="wrap_content" android:layout_height="50dp" android:background="#999999" android:gravity="center" android:text="页面2" android:textColor="#222222" /> <TextView android:id="@+id/textView3" android:layout_weight="1" android:layout_width="wrap_content" android:layout_height="50dp" android:background="#999999" android:gravity="center" android:text="页面3" android:textColor="#222222" /> </LinearLayout> <ImageView android:id="@+id/cursor" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/top_ly" android:scaleType="matrix" android:src="@drawable/cursor" /> <android.support.v4.view.ViewPager android:id="@+id/viewPager" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_below="@id/cursor" android:layout_gravity="center" /> </RelativeLayout>

package com.away.viewpager; import java.util.List; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.view.View; public class ViewPagerAdapter extends PagerAdapter { List<View> viewLists; public ViewPagerAdapter(List<View> lists) { viewLists = lists; } //取得size @Override public int getCount() { return viewLists.size(); } @Override public boolean isViewFromObject(View arg0, Object arg1) { return arg0 == arg1; } //烧毁Item @Override public void destroyItem(View view, int position, Object object) { ((ViewPager) view).removeView(viewLists.get(position)); } //实例化Item @Override public Object instantiateItem(View view, int position) { ((ViewPager) view).addView(viewLists.get(position), 0); return viewLists.get(position); } }

package com.away.viewpager; import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Matrix; import android.os.Bundle; import android.support.v4.view.ViewPager; import android.util.DisplayMetrics; import android.view.Menu; import android.view.View; import android.view.animation.Animation; import android.view.animation.TranslateAnimation; import android.widget.ImageView; import android.widget.TextView; public class MainActivity extends Activity { private ViewPager viewPager; private ImageView imageView; private List<View> lists = new ArrayList<View>(); private ViewPagerAdapter adapter; private Bitmap cursor; private int offSet; private int currentItem; private Matrix matrix = new Matrix(); private int bmWidth; private Animation animation; private TextView textView1; private TextView textView2; private TextView textView3; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); imageView = (ImageView) findViewById(R.id.cursor); textView1 = (TextView) findViewById(R.id.textView1); textView2 = (TextView) findViewById(R.id.textView2); textView3 = (TextView) findViewById(R.id.textView3); lists.add(getLayoutInflater().inflate(R.layout.layout1, null)); lists.add(getLayoutInflater().inflate(R.layout.layout2, null)); lists.add(getLayoutInflater().inflate(R.layout.layout3, null)); initeCursor(); adapter = new ViewPagerAdapter(lists); viewPager = (ViewPager) findViewById(R.id.viewPager); viewPager.setAdapter(adapter); viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { // 当滑动式，顶部的imageView是通过animation缓慢的滑动 @Override public void onPageSelected(int arg0) { switch (arg0) { case 0: if (currentItem == 1) { animation = new TranslateAnimation( offSet * 2 + bmWidth, 0, 0, 0); } else if (currentItem == 2) { animation = new TranslateAnimation(offSet * 4 + 2 * bmWidth, 0, 0, 0); } break; case 1: if (currentItem == 0) { animation = new TranslateAnimation(0, offSet * 2 + bmWidth, 0, 0); } else if (currentItem == 2) { animation = new TranslateAnimation(4 * offSet + 2 * bmWidth, offSet * 2 + bmWidth, 0, 0); } break; case 2: if (currentItem == 0) { animation = new TranslateAnimation(0, 4 * offSet + 2 * bmWidth, 0, 0); } else if (currentItem == 1) { animation = new TranslateAnimation( offSet * 2 + bmWidth, 4 * offSet + 2 * bmWidth, 0, 0); } } currentItem = arg0; animation.setDuration(150); // 光标滑动速度 animation.setFillAfter(true); imageView.startAnimation(animation); } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { } @Override public void onPageScrollStateChanged(int arg0) { } }); textView1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { viewPager.setCurrentItem(0); } }); textView2.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { viewPager.setCurrentItem(1); } }); textView3.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { viewPager.setCurrentItem(2); } }); } private void initeCursor() { cursor = BitmapFactory.decodeResource(getResources(), R.drawable.cursor); bmWidth = cursor.getWidth(); DisplayMetrics dm; dm = getResources().getDisplayMetrics(); offSet = (dm.widthPixels - 3 * bmWidth) / 6; matrix.setTranslate(offSet, 0); imageView.setImageMatrix(matrix); // 需要imageView的scaleType为matrix currentItem = 0; } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } }