本人是初学者，一直想把自己正在做的一些项目发表到网上与大家分享
这次给大家带来一个简单的安卓引导页面，利用ViewPager实现，加了一些安卓自带的特效MainActivity.java文件内容武如下：
package com.lingchen.android_day03;
import android.app.Activity;
import android.graphics.Color;
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.view.View;
import android.view.ViewGroup;
public class MainActivity extends Activity {
//step1.声明控件
private ViewPager mViewPager;//ViewPager 控件
private View[] childViews;//View 类型数组
private View[] childDots;//底部四个按钮
private PagerAdapter adapter;//适配起
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
//step2.查找控件
mViewPager = (ViewPager)
findViewById(R.id.viewpager);
//requestWindowFeature(Window.FEATURE_NO_TITLE);
mViewPager.setPageTransformer(true, new DepthPageTransformer());
//实例化数组,数组中存放新建的页面
childViews = new View[5];
//childView[0]:存放第一个页面page1.xml
childViews[0] = View.inflate(this, R.layout.page1, null);
childViews[1] =View.inflate(this, R.layout.page2, null);
childViews[2] = View.inflate(this, R.layout.page3, null);
childViews[3] = View.inflate(this,R.layout.page4,null);
childViews[4] = View.inflate(this,R.layout.page5,null);
//实例化数组，底部四个按钮
childDots = new View[5];
childDots[0] = (View)this.findViewById(R.id.dot1);
childDots[1] = (View)findViewById(R.id.dot2);
childDots[2] = (View)findViewById(R.id.dot3);
childDots[3] = (View)findViewById(R.id.dot4);
childDots[4] = (View)findViewById(R.id.dot5);
//step4.新建PagerAdapter(抽象类)
adapter = new InnerAdapter();
//step5.给ViewPager设置adapter
mViewPager.setAdapter(adapter);
//step6.给第一个底部按钮设置背景色白色
childDots[0].setBackgroundColor(Color.WHITE);
//step7给viewpager添加相应的事件处理
mViewPager.setOnPageChangeListener(new OnPageChangeListener() {
@Override
public void onPageSelected(int arg0) {
// TODO Auto-generated method stub
for(int i=0;i<childDots.length;i++){
//改变背景颜色
childDots[i].setBackgroundColor(Color.BLACK);
}
//改变最后一个按钮的颜色
childDots[arg0].setBackgroundColor(Color.WHITE);
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
// childDots[0].
}
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
});
}
class InnerAdapter extends PagerAdapter{
//读取到的滑动控件的数量
@Override
public int getCount() {
// TODO Auto-generated method stub
return childViews.length;
}
//判断是否为同一张图片
//本例中将两个参数相比返回即可
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
// TODO Auto-generated method stub
return arg0==arg1;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
// TODO Auto-generated method stub
//return super.instantiateItem(container, position);
container.addView(childViews[position]);
return childViews[position];
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
// TODO Auto-generated method stub
// super.destroyItem(container, position, object);
container.removeView(childViews[position]);
}
}
}
代码中很多注释，那些并不是做只是一种思路，可供参考。
特效文件是官方的我只是搬运过来，我从不创作源码，我只是源码的搬运工DepthPageTransformer.java
package com.lingchen.android_day03;
import android.support.v4.view.ViewPager;
import android.view.View;
public class DepthPageTransformer implements ViewPager.PageTransformer
{
private static float MIN_SCALE = 0.75f;
public void transformPage(View view, float position)
{
int pageWidth = view.getWidth();
if (position < -1) { // [-Infinity,-1)
// This page is way off-screen to the left.
view.setAlpha(0);
// ViewHelper.setAlpha(view, 0);
} else if (position <= 0) { // [-1,0] //A到B页
// Use the default slide transition when moving to the left page
view.setAlpha(1);
// ViewHelper.setAlpha(view, 1);
// ViewHelper.setTranslationX(view, 0);
view.setTranslationX(0);
view.setScaleX(1);
// ViewHelper.setScaleX(view, 1);
// ViewHelper.setScaleY(view, 1);
// view.setScaleY(1);
} else if (position <= 1) { // (0,1] //B到C页
// Fade the page out.
view.setAlpha(1 - position);
// ViewHelper.setAlpha(view, 1 - position);
// Counteract the default slide transition
view.setTranslationX(pageWidth * -position);
// ViewHelper.setAlpha(view, pageWidth * -position);
// Scale the page down (between MIN_SCALE and 1)
float scaleFactor = MIN_SCALE
+ (1 - MIN_SCALE) * (1 - Math.abs(position));
view.setScaleX(scaleFactor);
// ViewHelper.setScaleX(view, scaleFactor);
// ViewHelper.setScaleY(view, scaleFactor);
view.setScaleY(scaleFactor);
} else { // (1,+Infinity]
// This page is way off-screen to the right.
view.setAlpha(0);
// ViewHelper.setAlpha(view, 0);
}
}
}
布局文件activity_main.xml如下：
<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"
tools:context=".MainActivity" >
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</android.support.v4.view.ViewPager>
<LinearLayout
android:id="@+id/childDots"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true"
android:layout_marginBottom="50dp">
<View
android:id="@+id/dot1"
android:layout_width="8dp"
android:layout_height="8dp"
android:layout_marginLeft="3dp"
android:layout_marginRight="3dp"
android:background="@android:color/holo_red_light"/>
<View
android:id="@+id/dot2"
android:layout_width="8dp"
android:layout_height="8dp"
android:layout_marginLeft="3dp"
android:layout_marginRight="3dp"
android:background="@android:color/black"/>
<View
android:id="@+id/dot3"
android:layout_width="8dp"
android:layout_height="8dp"
android:layout_marginLeft="3dp"
android:layout_marginRight="3dp"
android:background="@android:color/black"/>
<View
android:id="@+id/dot4"
android:layout_width="8dp"
android:layout_height="8dp"
android:layout_marginLeft="3dp"
android:layout_marginRight="3dp"
android:background="@android:color/black"/>
<View
android:id="@+id/dot5"
android:layout_width="8dp"
android:layout_height="8dp"
android:layout_marginLeft="3dp"
android:layout_marginRight="3dp"
android:background="@android:color/holo_orange_light"/>
</LinearLayout>
</RelativeLayout>
新建page1~page5这个都一样我只放一个：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:id="@+id/page1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@drawable/image01"
android:scaleType="fitXY"/>
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:id="@+id/page1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@drawable/image02"
android:scaleType="fitXY"/>
</RelativeLayout>
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