Android欢迎界面引导页

</pre><pre class="java" name="code">package demo.lxiangjian.com.android_viewpager;

import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;

/**
 * 需求：
 * 1.主界面显示一张图片，一秒钟之后自动跳转到其他界面（MainActivity   GuideActivity）
 * 如果是第一次进入app，就跳转到GuideActivity,否则就跳转到MainActivity
 * 2.GuideActivity ：ViewPager显示3张图片，底部图标，
 * 点击最后一张图片，跳转到MainActivity
 *
 * @author pk
 */
public class WelcomeActivity extends AppCompatActivity {
    private boolean isFirstIn = true;//是否是第一次进入App
    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case 0:
                    startActivity(new Intent(WelcomeActivity.this, MainActivity.class));
                    finish();
                    break;
                case 1://第一次进入app
                    startActivity(new Intent(WelcomeActivity.this, GuideActivity.class));
                    finish();
                    break;
                default:
                    break;
            }
        }
    };


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

    private void init() {
        //判断是否是第一次进入app
        SharedPreferences preferences = getSharedPreferences("login", MODE_PRIVATE);
        isFirstIn = preferences.getBoolean("isFirstIn", true);
        if (isFirstIn) {
            handler.sendEmptyMessageDelayed(1, 1000);
            preferences.edit().putBoolean("isFirstIn", false).commit();
        } else {
            handler.sendEmptyMessageDelayed(0, 1000);
        }
    }
}
package demo.lxiangjian.com.android_viewpager;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;

/**
 * 需求：
    1.主界面显示一张图片，一秒钟之后自动跳转到其他界面（MainActivity   GuideActivity）
    如果是第一次进入app，就跳转到GuideActivity,否则就跳转到MainActivity
    2.GuideActivity ：ViewPager显示3张图片，底部图标，
    点击最后一张图片，跳转到MainActivity
 */

public class MainActivity extends AppCompatActivity {

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

}
package demo.lxiangjian.com.android_viewpagerdemo;

import android.content.Intent;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

import java.util.ArrayList;
import java.util.List;

public class GuideActivity extends AppCompatActivity {

    //1、声明控件
    private int[] imgeIds = new int[]{R.mipmap.guide_1, R.mipmap.guide_2, R.mipmap.guide_3};
    private List<ImageView> list;//存放图片的ImageView对象
    private ViewPager viewPager;
    private MyAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_guide);
        //2、初始化控件
        viewPager = (ViewPager) findViewById(R.id.viewPager);
        //获取数据源
        initData();
        //创建适配器
        adapter = new MyAdapter();
        //给ViewPager设置适配器
        viewPager.setAdapter(adapter);
    }

    private void initData() {
        list = new ArrayList<>();
        for (int i = 0; i < imgeIds.length; i++) {
            ImageView imageView = new ImageView(GuideActivity.this);
            imageView.setImageResource(imgeIds[i]);
            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
            list.add(imageView);
            //点击最后一张图片跳转到MainActivity
            if (i == imgeIds.length - 1) {
                imageView.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        startActivity(new Intent(GuideActivity.this,MainActivity.class));
                        finish();
                    }
                });
            }
        }
    }

    //自定义适配器
    public class MyAdapter extends PagerAdapter {

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

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

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

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

    }
}

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