大家对于微信等社交应用的UI界面已经都很熟悉了,该UI最值得借鉴的莫过于第一次使用的时候一些列产品介绍的图片,可以左右滑动浏览,最后进入应用,这一效果适用于多种项目中,相信今后开发应用一定会用得到。网路上也有不少这样的例子可以参考,不过看别人的代码是一回事,自己实际做起来又是另一回事,今天的这个微信的Demo是研究过多个类似的界面后自己动手去实现的效果,并且都加上了详细的注释(虽然有的多余),方便以后回顾一看就能看明白,只有真正亲自写一写,体会才会更深刻,例子中的图片都是在微信的APK中提取出来的,涉及到的知识点无外乎是ViewPager和Animation。
首先是开场闪屏的一个界面,使用handler控制该页面指定时间后进行跳转
package com.example.weichat.UI;
import com.example.weichat.R;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
/** 开场欢迎动画 */
public class WelcomeA extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.strat);
//延迟两秒后执行run方法中的页面跳转
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
Intent intent = new Intent(WelcomeA.this, WhatsnewPagesA.class);
startActivity(intent);
WelcomeA.this.finish();
}
}, 2000);
接着是主要的部分,也就是一系列的功能介绍图片,主要是viewpager来实现,嵌套在上面的小圆点的跟随导航也是要实现的效果之一
package com.example.weichat.UI;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Intent;
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.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.view.Window;
import android.widget.ImageView;
import com.example.weichat.R;
/** What's new 的导航界面 */
public class WhatsnewPagesA extends Activity {
/** Viewpager对象 */
private ViewPager viewPager;
private ImageView imageView;
/** 创建一个数组,用来存放每个页面要显示的View */
private ArrayList
/** 创建一个imageview类型的数组,用来表示导航小圆点 */
private ImageView[] imageViews;
/** 装显示图片的viewgroup */
private ViewGroup viewPictures;
/** 导航小圆点的viewgroup */
private ViewGroup viewPoints;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
LayoutInflater inflater = getLayoutInflater();
pageViews = new ArrayList
pageViews.add(inflater.inflate(R.layout.viewpager01, null));
pageViews.add(inflater.inflate(R.layout.viewpager02, null));
pageViews.add(inflater.inflate(R.layout.viewpager03, null));
pageViews.add(inflater.inflate(R.layout.viewpager04, null));
pageViews.add(inflater.inflate(R.layout.viewpager05, null));
pageViews.add(inflater.inflate(R.layout.viewpager06, null));
// 小圆点数组,大小是图片的个数
imageViews = new ImageView[pageViews.size()];
// 从指定的XML文件中加载视图
viewPictures = (ViewGroup) inflater.inflate(R.layout.viewpagers, null);
viewPager = (ViewPager) viewPictures.findViewById(R.id.guidePagers);
viewPoints = (ViewGroup) viewPictures.findViewById(R.id.viewPoints);
// 添加小圆点导航的图片
for (int i = 0; i < pageViews.size(); i++) {
imageView = new ImageView(WhatsnewPagesA.this);
imageView.setLayoutParams(new LayoutParams(20, 20));
imageView.setPadding(5, 0, 5, 0);
// 吧小圆点放进数组中
imageViews[i] = imageView;
// 默认选中的是第一张图片,此时第一个小圆点是选中状态,其他不是
if (i == 0)
imageViews[i].setImageDrawable(getResources().getDrawable(
R.drawable.page_indicator_focused));
else
imageViews[i].setImageDrawable(getResources().getDrawable(
R.drawable.page_indicator_unfocused));
// 将imageviews添加到小圆点视图组
viewPoints.addView(imageViews[i]);
}
setContentView(viewPictures);
viewPager.setAdapter(new NavigationPageAdapter());
// 为viewpager添加监听,当view发生变化时的响应
viewPager.setOnPageChangeListener(new NavigationPageChangeListener());
}
// 导航图片view的适配器,必须要实现的是下面四个方法
class NavigationPageAdapter extends PagerAdapter {
@Override
public int getCount() {
return pageViews.size();
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
// 初始化每个Item
@Override
public Object instantiateItem(View container, int position) {
((ViewPager) container).addView(pageViews.get(position));
return pageViews.get(position);
}
// 销毁每个Item
@Override
public void destroyItem(View container, int position, Object object) {
((ViewPager) container).removeView(pageViews.get(position));
}
}
// viewpager的监听器,主要是onPageSelected要实现
class NavigationPageChangeListener implements OnPageChangeListener {
@Override
public void onPageScrollStateChanged(int arg0) {
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageSelected(int position) {
// 循环主要是控制导航中每个小圆点的状态
for (int i = 0; i < imageViews.length; i++) {
// 当前view下设置小圆点为选中状态
imageViews[i].setImageDrawable(getResources().getDrawable(
R.drawable.page_indicator_focused));
// 其余设置为飞选中状态
if (position != i)
imageViews[i].setImageDrawable(getResources().getDrawable(
R.drawable.page_indicator_unfocused));
}
}
}
// 开始按钮方法,开始按钮在XML文件中onClick属性设置;
// 我试图把按钮在本activity中实例化并设置点击监听,但总是报错,使用这个方法后没有报错,原因没找到
public void startbutton(View v) {
Intent intent = new Intent(WhatsnewPagesA.this, WhatsnewAnimationA.class);
startActivity(intent);
WhatsnewPagesA.this.finish();
}
}
而后的便是开门的动画效果了,这一块还是比较简单的,分别控制两幅图片的移动动画就可以实现
package com.example.weichat.UI;
import com.example.weichat.R;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.view.animation.Animation;
import android.view.animation.AnimationSet;
import android.view.animation.TranslateAnimation;
import android.widget.ImageView;
/**导航过后的动画效果界面*/
public class WhatsnewAnimationA extends Activity {
private ImageView img_left, img_right;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.whatnew_animation);
img_left = (ImageView) findViewById(R.id.doorpage_left);
img_right = (ImageView) findViewById(R.id.doorpage_right);
//创建一个AnimationSet对象
AnimationSet animLeft = new AnimationSet(true);
TranslateAnimation transLeft = new TranslateAnimation(
Animation.RELATIVE_TO_SELF, 0f, Animation.RELATIVE_TO_SELF,
-1f, Animation.RELATIVE_TO_SELF, 0f,
Animation.RELATIVE_TO_SELF, 0f);
//设置动画效果持续的时间
transLeft.setDuration(2000);
//将anim对象添加到AnimationSet对象中
animLeft.addAnimation(transLeft);
animLeft.setFillAfter(true);
img_left.startAnimation(transLeft);
transLeft.startNow();
//创建一个AnimationSet对象
AnimationSet animRight = new AnimationSet(true);
TranslateAnimation transRight = new TranslateAnimation(
Animation.RELATIVE_TO_SELF, 0f, Animation.RELATIVE_TO_SELF,
1f, Animation.RELATIVE_TO_SELF, 0f,
Animation.RELATIVE_TO_SELF, 0f);
//设置动画效果持续的时间
transRight.setDuration(2000);
//将anim对象添加到AnimationSet对象中
animRight.addAnimation(transRight);
animRight.setFillAfter(true);
img_right.startAnimation(transRight);
transRight.startNow();
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
Intent intent = new Intent(WhatsnewAnimationA.this, FirstPageA.class);
startActivity(intent);
WhatsnewAnimationA.this.finish();
}
}, 1000);
}
}
最后进入到我们的登陆界面,就是一个简单的微信登陆布局,代码就不贴了
……