[Android学UI之三]实现新浪微博消息页面左右滑动页面方式二（二）

功能：

     新浪微博消息页面

使用说明：

     毕竟android.support.v4.view 是android官方提供的包。里面有实现滑动的方式，当然也要试试了！

界面差不多，也看看图了：

左右滑动基本可以使用了！

先看代码了：

界面activity:

package com.bbswp.viewpagerdemo;

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.os.Parcelable;
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.animation.Animation;
import android.view.animation.TranslateAnimation;
import android.widget.ImageView;
import android.widget.TextView;

/**
 * Tab页面手势滑动切换以及动画效果
 */
public class MainActivity extends Activity {
    // ViewPager是google SDk中自带的一个附加包的一个类，可以用来实现屏幕间的切换。
    // android-support-v4.jar
    private ViewPager mPager;// 页卡内容
    private List<View> listViews; // Tab页面列表
    private ImageView cursor;// 动画图片
    private TextView t1, t2, t3, t4;// 页卡头标
    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

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        InitImageView();
        InitTextView();
        InitViewPager();
    }

    /**
     * 初始化头标
     */
    private void InitTextView() {
        t1 = (TextView) findViewById(R.id.text1);
        t2 = (TextView) findViewById(R.id.text2);
        t3 = (TextView) findViewById(R.id.text3);
        t4 = (TextView) findViewById(R.id.text4);

        t1.setOnClickListener(new MyOnClickListener(0));
        t2.setOnClickListener(new MyOnClickListener(1));
        t3.setOnClickListener(new MyOnClickListener(2));
        t4.setOnClickListener(new MyOnClickListener(3));
    }

    /**
     * 初始化ViewPager
     */
    private void InitViewPager() {
        mPager = (ViewPager) findViewById(R.id.vPager);
        listViews = new ArrayList<View>();
        LayoutInflater mInflater = getLayoutInflater();
        listViews.add(mInflater.inflate(R.layout.lay1, null));
        listViews.add(mInflater.inflate(R.layout.lay2, null));
        listViews.add(mInflater.inflate(R.layout.lay3, null));
        listViews.add(mInflater.inflate(R.layout.lay4, null));
        mPager.setAdapter(new MyPagerAdapter(listViews));
        mPager.setCurrentItem(0);
        mPager.setOnPageChangeListener(new MyOnPageChangeListener());
    }

    /**
     * 初始化动画
     */
    private void InitImageView() {
        cursor = (ImageView) findViewById(R.id.cursor);
        bmpW = BitmapFactory.decodeResource(getResources(), R.drawable.a)
                .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 / 4 - bmpW) / 3;// 计算偏移量
        Matrix matrix = new Matrix();
        matrix.postTranslate(offset, 0);
        cursor.setImageMatrix(matrix);// 设置动画初始位置
    }

    /**
     * ViewPager适配器
     */
    public class MyPagerAdapter extends PagerAdapter {
        public List<View> mListViews;

        public MyPagerAdapter(List<View> mListViews) {
            this.mListViews = mListViews;
        }

        @Override
        public void destroyItem(View arg0, int arg1, Object arg2) {
            ((ViewPager) arg0).removeView(mListViews.get(arg1));
        }

        @Override
        public void finishUpdate(View arg0) {
        }

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

        @Override
        public Object instantiateItem(View arg0, int arg1) {
            ((ViewPager) arg0).addView(mListViews.get(arg1), 0);
            return mListViews.get(arg1);
        }

        @Override
        public boolean isViewFromObject(View arg0, Object arg1) {
            return arg0 == (arg1);
        }

        @Override
        public void restoreState(Parcelable arg0, ClassLoader arg1) {
        }

        @Override
        public Parcelable saveState() {
            return null;
        }

        @Override
        public void startUpdate(View arg0) {
        }
    }

    /**
     * 头标点击监听
     */
    public class MyOnClickListener implements View.OnClickListener {
        private int index = 0;

        public MyOnClickListener(int i) {
            index = i;
        }

        @Override
        public void onClick(View v) {
            mPager.setCurrentItem(index);
        }
    };

    /**
     * 页卡切换监听
     */
    public class MyOnPageChangeListener implements OnPageChangeListener {
        /**
         * 偏移量应该要根据界面计算出来，真实开发中，不能固定了。
         * 如果你有好的方法，可以交流一起交流了！！！
         * 这里，就不考虑适应屏幕了！
         */
        int off = 45;
        int one = off;//
        int two = off * 2;
        int three = off * 3;

        @Override
        public void onPageSelected(int arg0) {
            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);
                    } else if (currIndex == 3) {
                        animation = new TranslateAnimation(three, 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);
                    } else if (currIndex == 3) {
                        animation = new TranslateAnimation(three, 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);
                    } else if (currIndex == 3) {
                        animation = new TranslateAnimation(three, two, 0, 0);
                    }
                    break;
                case 3:
                    if (currIndex == 0) {
                        animation = new TranslateAnimation(offset, three, 0, 0);
                    } else if (currIndex == 1) {
                        animation = new TranslateAnimation(one, three, 0, 0);
                    } else if (currIndex == 2) {
                        animation = new TranslateAnimation(two, three, 0, 0);
                    }
                    break;
            }
            currIndex = arg0;
            animation.setFillAfter(true);// True:图片停在动画结束位置
            animation.setDuration(300);
            cursor.startAnimation(animation);
        }

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

        @Override
        public void onPageScrollStateChanged(int arg0) {
        }
    }
}

界面代码比上篇博客稍微复杂点了，呵呵！！！

但要注意，是需要android.support.v4.view 包的！滑动的viewpager类是在包里的！！

接下来就是xml:

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

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="50dip"
        android:background="@drawable/titlebar_bg_nor"
        android:orientation="vertical" >

        <LinearLayout
            android:id="@+id/linearLayout1"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="70dip"
            android:orientation="horizontal" >

            <TextView
                android:id="@+id/text1"
                style="@style/titleIcon"
                android:background="@drawable/msg_group_at"
                 />

            <TextView
                android:id="@+id/text2"
                style="@style/titleIcon"
                android:background="@drawable/msg_group_comment"
                />

            <TextView
                android:id="@+id/text3"
                style="@style/titleIcon"
                android:background="@drawable/msg_group_message"
                 />

            <TextView
                android:id="@+id/text4"
                style="@style/titleIcon"
                android:background="@drawable/msg_group_notification"
                 />
        </LinearLayout>

        <ImageView
            android:id="@+id/cursor"
             android:layout_width="20dip"
            android:layout_height="2dip"
            android:layout_marginLeft="80dip"
            android:layout_marginBottom="3dip"
            android:background="@drawable/title_bar_mark"
            />
    </LinearLayout>

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

</LinearLayout>

说明：本博客比较适合于界面学习，里面还有很多不完善的地方，离真实的开发，还需要一些调整的，

          希望大家能一起交流了！！！

          如果对项目中的问题，有好的方法，欢迎您能提出，让大家一起进步，谢谢！！！

     上一篇博客也是实现此界面，不过不是使用android的包，有兴趣去看看。

最后上代码：

下载地址：http://download.csdn.net/detail/hudan2714/4810054

一起学习交流，共同进步！！！