Android ViewPager 例子

jopen 10年前

20141031230918578.jpg20141031231117212.jpg

步骤：1、在main布局文件里添加viewPager布局

 
<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>
（可能需要导入jar包。下载地址：android-support-v4.jar）

再创建3个layout用于填充在ViewPager。我这里就是一个textview而已。

2、viewPager需要一个pagerAdapter的子类。

    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;            }                    //获得size            @Override            public int getCount() {                 return viewLists.size();            }                    @Override            public boolean isViewFromObject(View arg0, Object arg1) {                                         return arg0 == arg1;            }                        //销毁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);            }        }
</div> 3、最后mainActivity，主要写了左右滑动切换页面，还有一个小图片随页面切换位移的动画效果。
    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;            }        }
</div> 最后附上光标图20141031232142367.jpg。

来自：http://blog.csdn.net/ycwol/article/details/40663319

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