android 引导界面的设计

最近在研究如何做出仿微信，仿新浪等应用，第一次安装使用的使用展示应用程序的新特性和用法。

实现功能：左右手势滑屏

底部小圆点随当前显示页跳动

浮动按钮显示。当触屏事件发生显示，否则就渐渐消失

第一种： ViewFlipper + GestureDetector

第二种： ActivityGroup + GestureDetector

第三种： ViewPager (Android3.0+)

第四种： ViewFlow (开源项目)

话不多说，先放上效果图

向右滑动，或者点击按钮向右

怎么样，是不是很心动~~~！哈哈、

实现左右滑屏是需要一个叫做ViewPager的东西。具体ViewPager怎么用我就不赘述了。（PS注意导入ViewPager的兼容包)

接下来是代码：

首先在main.xml中声明ViewPager：

<LinearLayout android:id="@+id/linearLayout01" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" > <android.support.v4.view.ViewPager android:id="@+id/guidePages" android:layout_width="fill_parent" android:layout_height="fill_parent"/> </LinearLayout>和一个viewGroup放小圆点 <LinearLayout android:id="@+id/viewGroup" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_marginBottom="40dp" android:gravity="center_horizontal" android:orientation="horizontal" > </LinearLayout>

接着在item01.xml等几个xml中放置要显示的图片,因为几个都一样，就不都贴上来了。

<ImageView android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@drawable/feature_guide_0" > </ImageView>
接下来是核心代码：

public class GuideViewActivity extends Activity {private ViewPager viewPager; private ArrayList<View> pageViews; private ImageView imageView; private ImageView[] imageViews; // 包裹滑动图片LinearLayout private ViewGroup main;// 包裹小圆点的LinearLayout private ViewGroup group; //左箭头按钮 private ImageView imageViewLeft; //右箭头按钮 private ImageView imageViewRight; //当前页码 private int currentIndex; //ImageView的alpha值 private int mAlpha = 0; private boolean isHide; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //将要显示的图片放到ArrayList当中，存到适配器中 LayoutInflater inflater = getLayoutInflater(); pageViews = new ArrayList<View>(); pageViews.add(inflater.inflate(R.layout.item01, null));... [java] view plaincopyprint?

1. imageViews = new ImageView[pageViews.size()]; main = (ViewGroup)inflater.inflate(R.layout.main, null);
2. group = (ViewGroup)main.findViewById(R.id.viewGroup);
3. viewPager = (ViewPager)main.findViewById(R.id.guidePages); imageViewLeft = (ImageView)main.findViewById(R.id.imageView1);
4. imageViewRight = (ImageView)main.findViewById(R.id.imageView2); imageViewLeft.setAlpha(0);
5. imageViewRight.setAlpha(0);
6. //将小圆点放到imageView数组当中 for (int i = 0; i < pageViews.size(); i++) {
7. imageView = new ImageView(GuideViewActivity.this); imageView.setLayoutParams(new LayoutParams(20,20));
8. imageView.setPadding(20, 0, 20, 0); imageViews[i] = imageView;
9. if (i == 0) {
10. //默认选中第一张图片 imageViews[i].setBackgroundResource(R.drawable.page_indicator_focused);
11. } else { imageViews[i].setBackgroundResource(R.drawable.page_indicator);
12. }
13. group.addView(imageViews[i]); }
14. setContentView(main);
15. viewPager.setAdapter(new GuidePageAdapter());
16. viewPager.setOnPageChangeListener(new GuidePageChangeListener()); imageViewLeft.setOnClickListener(new ButtonListener());
17. imageViewRight.setOnClickListener(new ButtonListener()); }
18. //左右切换屏幕的按钮监听器
19. class ButtonListener implements OnClickListener{
20. @Override public void onClick(View v) {
21. // TODO Auto-generated method stub int showNext=0;
22. if(v.getId() == R.id.imageView1) { System.out.println("点击了向左的按钮");
23. if(currentIndex ==0 ) showNext = currentIndex;
24. else showNext = currentIndex-1;
25. viewPager.setCurrentItem(showNext); }
26. if(v.getId() == R.id.imageView2){ System.out.println("点击了向右的按钮");
27. if(currentIndex == imageViews.length) showNext = currentIndex;
28. else showNext = currentIndex+1;
29. viewPager.setCurrentItem(showNext); }
30. System.out.println("当前页码："+showNext);
31. }
32. }
33. /** * 设置按钮渐显效果
34. */ private Handler mHandler = new Handler()
35. { public void handleMessage(Message msg) {
36. if(msg.what==1 && mAlpha<255){ //通过设置不透明度设置按钮的渐显效果
37. mAlpha += 50;
38. if(mAlpha>255) mAlpha=255;
39. imageViewLeft.setAlpha(mAlpha);
40. imageViewLeft.invalidate(); imageViewRight.setAlpha(mAlpha);
41. imageViewRight.invalidate();
42. if(!isHide && mAlpha<255) mHandler.sendEmptyMessageDelayed(1, 100);
43. }else if(msg.what==0 && mAlpha>0){ mAlpha -= 3;
44. if(mAlpha<0)
45. mAlpha=0; imageViewLeft.setAlpha(mAlpha);
46. imageViewLeft.invalidate(); imageViewRight.setAlpha(mAlpha);
47. imageViewRight.invalidate();
48. if(isHide && mAlpha>0) mHandler.sendEmptyMessageDelayed(0, 2);
49. } }
50. };
51. private void showImageButtonView(){ isHide = false;
52. mHandler.sendEmptyMessage(1); }
53. private void hideImageButtonView(){
54. new Thread(){ public void run() {
55. try { isHide = true;
56. mHandler.sendEmptyMessage(0); } catch (Exception e) {
57. ; }
58. } }.start();
59. }
62. @Override public boolean dispatchTouchEvent(MotionEvent ev) {
63. System.out.println("this is dispatch"); System.out.println("触碰屏幕");
64. switch (ev.getAction()) { case MotionEvent.ACTION_MOVE:
65. case MotionEvent.ACTION_DOWN: showImageButtonView();
66. break; case MotionEvent.ACTION_UP:
67. hideImageButtonView(); break;
68. }
69. return super.dispatchTouchEvent(ev);
70. }
71. // 指引页面数据适配器,实现适配器方法 class GuidePageAdapter extends PagerAdapter {
72. @Override
73. public int getCount() { return pageViews.size();
74. }
75. @Override public boolean isViewFromObject(View arg0, Object arg1) {
76. return arg0 == arg1; }
77. @Override
78. public int getItemPosition(Object object) { // TODO Auto-generated method stub
79. return super.getItemPosition(object); }
80. @Override
81. public void destroyItem(View arg0, int arg1, Object arg2) { // TODO Auto-generated method stub
82. ((ViewPager) arg0).removeView(pageViews.get(arg1)); }
83. @Override
84. public Object instantiateItem(View arg0, int arg1) { // TODO Auto-generated method stub
85. ((ViewPager) arg0).addView(pageViews.get(arg1)); return pageViews.get(arg1);
86. }
87. @Override public void restoreState(Parcelable arg0, ClassLoader arg1) {
88. // TODO Auto-generated method stub
89. }
90. @Override public Parcelable saveState() {
91. // TODO Auto-generated method stub return null;
92. }
93. @Override public void startUpdate(View arg0) {
94. // TODO Auto-generated method stub
95. }
96. @Override public void finishUpdate(View arg0) {
97. // TODO Auto-generated method stub
98. } }
99. // 指引页面更改事件监听器,左右滑动图片时候，小圆点变换显示当前图片位置
100. class GuidePageChangeListener implements OnPageChangeListener {
101. @Override public void onPageScrollStateChanged(int arg0) {
102. // TODO Auto-generated method stub
103. }
104. @Override public void onPageScrolled(int arg0, float arg1, int arg2) {
105. // TODO Auto-generated method stub
106. }
107. @Override public void onPageSelected(int arg0) {
108. currentIndex = arg0; for (int i = 0; i < imageViews.length; i++) {
109. imageViews[arg0].setBackgroundResource(R.drawable.page_indicator_focused);
110. if (arg0 != i) { imageViews[i].setBackgroundResource(R.drawable.page_indicator);
111. } }
112. } }