android起始页面与导航页面

每一次打开QQ或者支付宝都会有一个相同的起始页面，而第一次打开app还会有一个导航页面。

起始页面用一个ImageView 就可以了，而导航页面则需要一个v4包下面的ViewPage。

起始页面代码如下：

public class StartActivity extends BaseActivity {private ImageView ivSplash;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.startactivity);ivSplash = (ImageView) findViewById(R.id.ivSplash);AlphaAnimation anim = new AlphaAnimation(0f, 1f);anim.setDuration(2000);anim.setAnimationListener(new AnimationListener() {@Overridepublic void onAnimationStart(Animation arg0) {}@Overridepublic void onAnimationRepeat(Animation arg0) {}@Overridepublic void onAnimationEnd(Animation arg0) {skip();}});ivSplash.startAnimation(anim);}public void skip() {Intent intent = new Intent();intent.setClass(this, GuideActivity.class);startActivity(intent);finish();}}

导航页面代码如下:

public class GuideActivity extends BaseActivity {private android.support.v4.view.ViewPager vpContent;private Button btnSkip;private int[] datas;private void bindViews() {vpContent = (android.support.v4.view.ViewPager) findViewById(R.id.vpContent);btnSkip = (Button) findViewById(R.id.btnSkip);btnSkip.setOnClickListener(new OnClickListener() {public void onClick(View arg0) {skip();}});}protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.guideactivity);bindViews();datas = new int[] { R.drawable.launch_1, R.drawable.launch_2,R.drawable.launch_3, R.drawable.launch_4 };vpContent.setAdapter(new MyPagerAdapter());vpContent.setOnPageChangeListener(new OnPageChangeListener() {public void onPageSelected(int position) {if (position == 3) {btnSkip.setVisibility(View.VISIBLE);} else {btnSkip.setVisibility(View.INVISIBLE);}}public void onPageScrolled(int arg0, float arg1, int arg2) {}public void onPageScrollStateChanged(int arg0) {}});}public void skip() {System.out.println("进入skip()");Intent intent = new Intent();intent.setClass(this, LoginActiviy.class);startActivity(intent);finish();}class MyPagerAdapter extends PagerAdapter {@Overridepublic int getCount() {return datas.length;}@Overridepublic boolean isViewFromObject(View arg0, Object arg1) {return arg0 == arg1;}@Overridepublic void destroyItem(ViewGroup container, int position, Object object) {container.removeView((View) object);}@Overridepublic Object instantiateItem(ViewGroup container, int position) {int i = datas[position];ImageView imageView = new ImageView(GuideActivity.this);imageView.setBackgroundResource(i);container.addView(imageView);return imageView;}}}

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