[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！！！