欢迎引导页面的滑动进入

public class WelcomeActivity extends Activity {

private final int[] imageIDs = new int[]{R.mipmap.guide_image_01, R.mipmap.guide_image_02,
R.mipmap.guide_image_03};

private volatile boolean isLastPage;//viewPager是否跑到最后一页
@ViewInject(R.id.viewPager)//其实就是findViewByID
private ViewPager viewPager;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_welcome);
startGuidePage();
}

@Override
protected void onDestroy() {
super.onDestroy();
}

/**
* 开启引导页
*/
private void startGuidePage() {
List<ImageView> views = new ArrayList<>();
ImageView imageView;
for (int i = 0; i < imageIDs.length; i++) {
imageView = new ImageView(this);
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
imageView.setImageResource(imageIDs[i]);
imageView.setLayoutParams(params);
if (i == imageIDs.length - 1) {
//点击进入
imageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
goMainActivity();
}
});
}
views.add(imageView);
}
viewPager.setVisibility(View.VISIBLE);
viewPager.setAdapter(new GuideAdapter(views));
final EdgeEffectCompat edgeEffectCompat = getEdgeEffectCompat(viewPager);
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
AtomicBoolean isGoMainActivity = new AtomicBoolean(false);

@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}

@Override
public void onPageSelected(int position) {
isLastPage = position == imageIDs.length - 1;
}

@Override
public void onPageScrollStateChanged(int state) {
boolean isIdleState = (state == ViewPager.SCROLL_STATE_IDLE);//viewPager是否处于闲置状态
if (isLastPage && isIdleState &&//处于最后页 并处于闲置状态(也可认为是手指离开了屏幕)
edgeEffectCompat != null && !edgeEffectCompat.isFinished()//表示viewPager右边缘色已经展示
&& isGoMainActivity.compareAndSet(false, true))//避免重复进入

b8dd
//进入主界面
goMainActivity();
}
});
}

/**
* viewPager右边缘色 对象
*/
private EdgeEffectCompat getEdgeEffectCompat(ViewPager viewPager) {
EdgeEffectCompat edgeEffectCompat = null;
try {
Field mRightEdge = viewPager.getClass().getDeclaredField("mRightEdge");
mRightEdge.setAccessible(true);
edgeEffectCompat = (EdgeEffectCompat) mRightEdge.get(viewPager);
} catch (Exception e) {
e.printStackTrace();
}
return edgeEffectCompat;
}

/**
* 进入主界面
*/
private void goMainActivity() {
startActivity(new Intent(this, MainActivity.class));
finish();
}
}

public class GuideAdapter extends PagerAdapter {

private List<ImageView> views;

public GuideAdapter(List<ImageView> views){
this.views=views;
}

@Override
public int getCount() {
return views.size();
}

@Override
public boolean isViewFromObject(View view, Object object) {
return view==object;
}

@Override
public Object instantiateItem(ViewGroup container, int position) {
container.addView(views.get(position));
return views.get(position);
}

@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView(views.get(position));
}
}