package com.devilwwj.featureguide;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.os.Handler;import com.devilwwj.featureguide.global.AppConstants;import com.devilwwj.featureguide.utils.SpUtils;/**
 * @desc 启动屏
 * Created by devilwwj on 16/1/23.
 */public class SplashActivity extends Activity {    @Override
    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        // 判断是否是第一次开启应用
        boolean isFirstOpen = SpUtils.getBoolean(this, AppConstants.FIRST_OPEN);        // 如果是第一次启动，则先进入功能引导页
        if (!isFirstOpen) {
            Intent intent = new Intent(this, WelcomeGuideActivity.class);
            startActivity(intent);
            finish();            return;
        }        // 如果不是第一次启动app，则正常显示启动屏
        setContentView(R.layout.activity_splash);        new Handler().postDelayed(new Runnable() {            @Override
            public void run() {
                enterHomeActivity();
            }
        }, 2000);
    }    private void enterHomeActivity() {
        Intent intent = new Intent(this, MainActivity.class);
        startActivity(intent);
        finish();
    }
}

package com.devilwwj.featureguide;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.support.v4.view.ViewPager;import android.support.v4.view.ViewPager.OnPageChangeListener;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageView;import android.widget.LinearLayout;import com.devilwwj.featureguide.global.AppConstants;import com.devilwwj.featureguide.utils.SpUtils;import java.util.ArrayList;import java.util.List;/**
 * 欢迎页
 * 
 * @author wwj_748
 * 
 */public class WelcomeGuideActivity extends Activity implements OnClickListener {    private ViewPager vp;    private GuideViewPagerAdapter adapter;    private List<View> views;    private Button startBtn;    // 引导页图片资源
    private static final int[] pics = { R.layout.guid_view1,
            R.layout.guid_view2, R.layout.guid_view3, R.layout.guid_view4 };    // 底部小点图片
    private ImageView[] dots;    // 记录当前选中位置
    private int currentIndex;    @Override
    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_guide);

        views = new ArrayList<View>();        // 初始化引导页视图列表
        for (int i = 0; i < pics.length; i++) {
            View view = LayoutInflater.from(this).inflate(pics[i], null);            if (i == pics.length - 1) {
                startBtn = (Button) view.findViewById(R.id.btn_login);
                startBtn.setTag("enter");
                startBtn.setOnClickListener(this);
            }

            views.add(view);

        }

        vp = (ViewPager) findViewById(R.id.vp_guide);        // 初始化adapter
        adapter = new GuideViewPagerAdapter(views);
        vp.setAdapter(adapter);
        vp.setOnPageChangeListener(new PageChangeListener());

        initDots();

    }    @Override
    protected void onResume() {        super.onResume();
    }    @Override
    protected void onPause() {        super.onPause();        // 如果切换到后台，就设置下次不进入功能引导页
        SpUtils.putBoolean(WelcomeGuideActivity.this, AppConstants.FIRST_OPEN, true);
        finish();
    }    @Override
    protected void onStop() {        super.onStop();
    }    @Override
    protected void onDestroy() {        super.onDestroy();
    }    private void initDots() {
        LinearLayout ll = (LinearLayout) findViewById(R.id.ll);
        dots = new ImageView[pics.length];        // 循环取得小点图片
        for (int i = 0; i < pics.length; i++) {            // 得到一个LinearLayout下面的每一个子元素
            dots[i] = (ImageView) ll.getChildAt(i);
            dots[i].setEnabled(false);// 都设为灰色
            dots[i].setOnClickListener(this);
            dots[i].setTag(i);// 设置位置tag，方便取出与当前位置对应
        }

        currentIndex = 0;
        dots[currentIndex].setEnabled(true); // 设置为白色，即选中状态

    }    /**
     * 设置当前view
     * 
     * @param position
     */
    private void setCurView(int position) {        if (position < 0 || position >= pics.length) {            return;
        }
        vp.setCurrentItem(position);
    }    /**
     * 设置当前指示点
     * 
     * @param position
     */
    private void setCurDot(int position) {        if (position < 0 || position > pics.length || currentIndex == position) {            return;
        }
        dots[position].setEnabled(true);
        dots[currentIndex].setEnabled(false);
        currentIndex = position;
    }    @Override
    public void onClick(View v) {        if (v.getTag().equals("enter")) {
            enterMainActivity();            return;
        }        int position = (Integer) v.getTag();
        setCurView(position);
        setCurDot(position);
    }    private void enterMainActivity() {
        Intent intent = new Intent(WelcomeGuideActivity.this,
                SplashActivity.class);
        startActivity(intent);
        SpUtils.putBoolean(WelcomeGuideActivity.this, AppConstants.FIRST_OPEN, true);
        finish();
    }    private class PageChangeListener implements OnPageChangeListener {        // 当滑动状态改变时调用
        @Override
        public void onPageScrollStateChanged(int position) {            // arg0 ==1的时辰默示正在滑动，arg0==2的时辰默示滑动完毕了，arg0==0的时辰默示什么都没做。

        }        // 当前页面被滑动时调用
        @Override
        public void onPageScrolled(int position, float arg1, int arg2) {            // arg0 :当前页面，及你点击滑动的页面
            // arg1:当前页面偏移的百分比
            // arg2:当前页面偏移的像素位置

        }        // 当新的页面被选中时调用
        @Override
        public void onPageSelected(int position) {            // 设置底部小点选中状态
            setCurDot(position);
        }

    }
}