ViewPager引導頁

第一步：XML佈局文件

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.daohangye.MainActivity">
    <android.support.v4.view.ViewPager
        android:id="@+id/vp"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></android.support.v4.view.ViewPager>
    <LinearLayout
        android:id="@+id/liner"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|center"
        android:gravity="center"
        android:orientation="horizontal"></LinearLayout>
    <!--android:visibility="gone"按鈕隱藏-->
    <Button
        android:id="@+id/btn"
        android:text="歡迎"
        android:visibility="gone"
        android:layout_gravity="bottom|center"
        android:gravity="center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</FrameLayout>

在drawable

設置兩個佈局：製做導航頁底部圓點

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <corners android:radius="10dp"></corners>
    <solid android:color="#ffffff"></solid>
</shape>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <corners android:radius="10dp"></corners>
    <solid android:color="#000000"></solid>
</shape>

第二部：適配器

public class Adapter extends PagerAdapter {
    private List<ImageView> list;

    public Adapter(List<ImageView> list) {
        this.list = list;
    }

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

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

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

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

第三步：代碼實現

package com.example.daohangye;

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

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

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private ViewPager vp;
    private LinearLayout liner;
    private Button btn;
    private List<ImageView> list;
    private List<ImageView> yuandian;

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

        //獲取數據庫
        SharedPreferences name = getSharedPreferences("name", 0);
        //獲取數據庫內容
        String key = name.getString("key", "");
        //判斷是否存在相同內容，存在直接跳轉
        if (key.equals("value")){
            Intent intent = new Intent(MainActivity.this,Main2Activity.class);
            startActivity(intent);
        }
        initView();
        initData();
        initAdapter();
        initListener();
    }
    private void initListener() {
        //viewpager的滑動監聽
        vp.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
            }
            @Override
            public void onPageSelected(int position) {
                for (int i = 0; i < 3; i++) {
                    if (position==i){
                        yuandian.get(i).setBackgroundResource(R.drawable.shape2);
                    }else {
                        yuandian.get(i).setBackgroundResource(R.drawable.shape);
                    }
                }
                if (position==list.size()-1){
                    //設置顯示
                    btn.setVisibility(View.VISIBLE);
                    //設置隱藏
                    liner.setVisibility(View.INVISIBLE);
                }
                if (position<list.size()-1){
                    btn.setVisibility(View.INVISIBLE);
                    liner.setVisibility(View.VISIBLE);
                }
            }
            @Override
            public void onPageScrollStateChanged(int state) {
            }
        });
    }
    private void initAdapter() {
        Adapter adapter = new Adapter(list);
        vp.setAdapter(adapter);
        vp.setCurrentItem(0);
    }
    private void initData() {
        list = new ArrayList<>();
        for (int i = 0; i < 3; i++) {
            ImageView imageView = new ImageView(this);
            imageView.setImageResource(R.mipmap.ic_launcher);
            //圖片自適應
            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
            list.add(imageView);
        }
        yuandian = new ArrayList<>();
        for (int i = 0; i < 3; i++) {
            ImageView imageView = new ImageView(this);
            LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT);
            //設置圓點屬性
            lp.height=10;
            lp.width=10;
            lp.leftMargin=18;
            lp.rightMargin=18;
            //判斷當前ViewPager索引，而後設置底部圓點樣式
            if (i==0){
                imageView.setBackgroundResource(R.drawable.shape2);
            }else {
                imageView.setBackgroundResource(R.drawable.shape);
            }
            imageView.setLayoutParams(lp);
            liner.addView(imageView);
            yuandian.add(imageView);
        }
    }
    private void initView() {
        vp = (ViewPager) findViewById(R.id.vp);
        liner = (LinearLayout) findViewById(R.id.liner);
        btn = (Button) findViewById(R.id.btn);
        btn.setOnClickListener(this);
    }
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btn:
                //設置小型本地數據庫
                SharedPreferences sharedPreferences = getSharedPreferences("name",0);
                //獲取一個操做對象
                SharedPreferences.Editor edit = sharedPreferences.edit();
                edit.putString("key","value");
                edit.commit();
                Intent intent = new Intent(MainActivity.this,Main2Activity.class);
                startActivity(intent);
                finish();
                break;
        }
    }
}