Android开发引导页(仅出现一次)

概述Welocm.javapackagecom.example.test;importandroid.content.Intent;importandroid.os.Bundle;importandroid.view.View;importandroid.view.ViewGroup;importandroid.widget.Button;importandroid.widget.ImageView;importandroidx.appcompat.app.AppCompa

Welocm.java

package com.example.test;import androID.content.Intent;import androID.os.Bundle;import androID.vIEw.VIEw;import androID.vIEw.VIEwGroup;import androID.Widget.button;import androID.Widget.ImageVIEw;import androIDx.appcompat.app.AppCompatActivity;import androIDx.vIEwpager.Widget.PagerAdapter;import androIDx.vIEwpager.Widget.VIEwPager;import java.util.ArrayList;import java.util.List;import Share_tool.SharedPreferencesUtils;public class Welcome extends AppCompatActivity {    private List<VIEw> vIEws;    private button btn_guIDe;    private VIEwPager vIEwPager;    private ImageVIEw point1, point2, point3, point4;    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        //判断是否第一次启动        Boolean isfirstlogin=SharedPreferencesUtils.getBoolean(Welcome.this,"isFirstLogin",false);        if(isfirstlogin==true){            startActivity(new Intent(Welcome.this, MainActivity.class));            finish();        }        setContentVIEw(R.layout.activity_splash);        vIEwPager = (VIEwPager) findVIEwByID(R.ID.pager_guIDe);        //绑定组件        btn_guIDe = findVIEwByID(R.ID.btn_guIDe);        point1 = findVIEwByID(R.ID.point1);        point2 = findVIEwByID(R.ID.point2);        point3 = findVIEwByID(R.ID.point3);        point4 = findVIEwByID(R.ID.point4);        //初始化        initVIEwPager();        //设置适配器        vIEwPager.setAdapter(new GuIDeAdapter(vIEws));        vIEwPager.setPagetransformer(false, new DepthPagetransformer());        setPointimg(true, false, false, false);        btn_guIDe.setonClickListener(new VIEw.OnClickListener() {            public voID onClick(VIEw v) {                SharedPreferencesUtils.saveBoolean(Welcome.this,"isFirstLogin",true);                startActivity(new Intent(Welcome.this, MainActivity.class));                finish();            }        });    }    //初始化vIEwpager    public voID initVIEwPager(){        vIEws=new ArrayList<VIEw>();        ImageVIEw iv1=new ImageVIEw(this);        iv1.setimageResource(R.drawable.a1);        iv1.setScaleType(ImageVIEw.ScaleType.FIT_XY);        ImageVIEw iv2=new ImageVIEw(this);        iv2.setimageResource(R.drawable.a2);        iv2.setScaleType(ImageVIEw.ScaleType.FIT_XY);        ImageVIEw iv3=new ImageVIEw(this);        //为ImageVIEw添加图片资源        iv3.setimageResource(R.drawable.a3);        //设置图片充满屏幕        iv3.setScaleType(ImageVIEw.ScaleType.FIT_XY);        ImageVIEw iv4=new ImageVIEw(this);        iv4.setimageResource(R.drawable.a4);        iv4.setScaleType(ImageVIEw.ScaleType.FIT_XY);        vIEws.add(iv1);        vIEws.add(iv2);        vIEws.add(iv3);        vIEws.add(iv4);        vIEwPager.addOnPagechangelistener(new VIEwPager.OnPagechangelistener() {            @OverrIDe            public voID onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {            }            //pager切换            @OverrIDe            public voID onPageSelected(int position) {                //如果是第三个页面就显示按钮，反之不显示                switch (position) {                    case 0:                        setPointimg(true, false, false, false);                        btn_guIDe.setVisibility(VIEw.GONE);                        break;                    case 1:                        setPointimg(false, true, false, false);                        btn_guIDe.setVisibility(VIEw.GONE);                        break;                    case 2:                        setPointimg(false, false, true, false);                        btn_guIDe.setVisibility(VIEw.GONE);                        break;                    case 3:                        setPointimg(false, false, false, true);                        btn_guIDe.setVisibility(VIEw.VISIBLE);                        break;                }            }            @OverrIDe            public voID onPageScrollStateChanged(int state) {            }        });    }    //设置适配器    class GuIDeAdapter extends PagerAdapter {        private List<VIEw> vIEws;        public GuIDeAdapter(List<VIEw> v){            this.vIEws=v;        }        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) {            ((VIEwPager) container).addVIEw(vIEws.get(position));            return vIEws.get(position);        }        @OverrIDe        public voID destroyItem(VIEwGroup container, int position, Object object) {            ((VIEwPager) container).removeVIEw(vIEws.get(position));            //super.destroyItem(container, position, object);        }    }    //动画切换特效    public class DepthPagetransformer implements VIEwPager.Pagetransformer {        private static final float MIN_SCALE = 0.75f;        public voID transformPage(VIEw vIEw, float position) {            int pageWIDth = vIEw.getWIDth();            if (position < -1) { // [-Infinity,-1)                // This page is way off-screen to the left.                vIEw.setAlpha(0);            } else if (position <= 0) { // [-1,0]                // Use the default slIDe Transition when moving to the left page                vIEw.setAlpha(1);                vIEw.setTranslationX(0);                vIEw.setScaleX(1);                vIEw.setScaleY(1);            } else if (position <= 1) { // (0,1]                // Fade the page out.                vIEw.setAlpha(1 - position);                // Counteract the default slIDe Transition                vIEw.setTranslationX(pageWIDth * -position);                // Scale the page down (between MIN_SCALE and 1)                float scaleFactor = MIN_SCALE                        + (1 - MIN_SCALE) * (1 - Math.abs(position));                vIEw.setScaleX(scaleFactor);                vIEw.setScaleY(scaleFactor);            } else { // (1,+Infinity]                // This page is way off-screen to the right.                vIEw.setAlpha(0);            }        }    }    //设置小圆点的选中效果    private voID setPointimg(boolean isCheck1, boolean isCheck2, boolean isCheck3, boolean isCheck4) {        if (isCheck1) {            point1.setBackgroundResource(R.drawable.point_on);        } else {            point1.setBackgroundResource(R.drawable.point_off);        }        if (isCheck2) {            point2.setBackgroundResource(R.drawable.point_on);        } else {            point2.setBackgroundResource(R.drawable.point_off);        }        if (isCheck3) {            point3.setBackgroundResource(R.drawable.point_on);        } else {            point3.setBackgroundResource(R.drawable.point_off);        }        if (isCheck4) {            point4.setBackgroundResource(R.drawable.point_on);        } else {            point4.setBackgroundResource(R.drawable.point_off);        }    }}

SharedPreferencesUtils.java

package Share_tool;import androID.content.Context;import androID.content.SharedPreferences;import androID.vIEw.VIEw;/**共享偏好类工具 */public class SharedPreferencesUtils {    private static final String file_name="share_data";    private static SharedPreferences sp;    /**保存数据的方法,     * 由数据类型然后根据数据类型进行调用*/    public static voID saveBoolean(Context context, String key, boolean value) {        if (sp == null){            sp = context.getSharedPreferences(file_name, 0);        }        sp.edit().putBoolean(key, value).commit();    }    public static voID saveString(Context context, String key, String value) {        if (sp == null){            sp = context.getSharedPreferences(file_name, 0);        }        sp.edit().putString(key, value).commit();    }    public static voID saveInt(Context context, String key, int value) {        if (sp == null){            sp = context.getSharedPreferences(file_name, 0);        }        sp.edit().putInt(key, value).commit();    }    public static voID saveBoolean(Context context, String key, String value) {        if (sp == null){            sp = context.getSharedPreferences(file_name, 0);        }        sp.edit().putString(key, value).commit();    }    public static voID savefloat(Context context, String key, float value) {        if (sp == null){            sp = context.getSharedPreferences(file_name, 0);        }        sp.edit().putfloat(key, value).commit();    }    public static voID saveLong(Context context, String key, Long value) {        if (sp == null){            sp = context.getSharedPreferences(file_name, 0);        }        sp.edit().putLong(key, value).commit();    }    /**得到保存数据的方法，     * 根据默认值得到保存的数据的具体类型，     * 然后调用相对于的方法获取值*/    public static int getInt(Context context, String key,int defvalue) {        if (sp == null){            sp = context.getSharedPreferences(file_name, 0);        }        return sp.getInt(key, defvalue);    }    public static Boolean getBoolean(Context context, String key,Boolean defvalue) {        if (sp == null){            sp = context.getSharedPreferences(file_name, 0);        }        return sp.getBoolean(key, defvalue);    }    public static String getString(Context context, String key,String defvalue) {        if (sp == null){            sp = context.getSharedPreferences(file_name, 0);        }        return sp.getString(key, defvalue);    }    public static float getfloat(Context context, String key,float defvalue) {        if (sp == null){            sp = context.getSharedPreferences(file_name, 0);        }        return sp.getfloat(key, defvalue);    }    public static Long getLong(Context context, String key,Long defvalue) {        if (sp == null){            sp = context.getSharedPreferences(file_name, 0);        }        return sp.getLong(key, defvalue);    }    /**     * 清除所有数据     * @param context     */    public static voID clear(Context context) {        if(sp==null)            sp = context.getSharedPreferences(file_name, Context.MODE_PRIVATE);        SharedPreferences.Editor editor = sp.edit();        editor.clear().commit();    }    /**     * 清除指定数据     */    public static voID clearall(Context context,String key) {        if(sp==null)            sp = context.getSharedPreferences(file_name, Context.MODE_PRIVATE);        SharedPreferences.Editor editor = sp.edit();        editor.remove(key);        editor.commit();    }}

activity_splash.xml

<?xml version="1.0" enCoding="utf-8"?><relativeLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"    xmlns:app="http://schemas.androID.com/apk/res-auto"    xmlns:tools="http://schemas.androID.com/tools"    androID:layout_wIDth="match_parent"    androID:layout_height="match_parent"    tools:context=".Welcome">    <androIDx.vIEwpager.Widget.VIEwPager        androID:ID="@+ID/pager_guIDe"        androID:layout_wIDth="match_parent"        androID:layout_height="match_parent"        androID:overScrollMode="never">    </androIDx.vIEwpager.Widget.VIEwPager>    <linearLayout        androID:layout_wIDth="144dp"        androID:layout_height="36dp"        androID:layout_alignParentBottom="true"        androID:layout_centerHorizontal="true"        androID:layout_marginBottom="15dp"        androID:gravity="center"        androID:orIEntation="horizontal">        <ImageVIEw            androID:ID="@+ID/point1"            androID:layout_wIDth="wrap_content"            androID:layout_height="wrap_content"            androID:layout_weight="1" />        <ImageVIEw            androID:ID="@+ID/point2"            androID:layout_wIDth="wrap_content"            androID:layout_height="wrap_content"            androID:layout_weight="1"/>        <ImageVIEw            androID:ID="@+ID/point3"            androID:layout_wIDth="wrap_content"            androID:layout_height="wrap_content"            androID:layout_weight="1"/>        <ImageVIEw            androID:ID="@+ID/point4"            androID:layout_wIDth="wrap_content"            androID:layout_height="wrap_content"            androID:layout_weight="1" />    </linearLayout>    <button        androID:ID="@+ID/btn_guIDe"        androID:layout_wIDth="wrap_content"        androID:layout_height="wrap_content"        androID:layout_alignParentBottom="true"        androID:layout_centerHorizontal="true"        androID:layout_marginBottom="60dp"        androID:background="@null"        androID:paddingleft="10dp"        androID:paddingRight="10dp"        androID:text="立即进入"        androID:textAppearance="@style/TextAppearance.AppCompat.Body1"        androID:textcolor="#CF8282"        androID:textcolorHighlight="#1F7095"        androID:textSize="36sp"        androID:visibility="gone" /></relativeLayout>    <!--    androID:layout_marginleft="10dp"        androID:layout_marginRight="10dp"-->

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