Android实现新闻项目

水深无声 2022-05-18 09:42 117阅读 0赞

这是一个新闻类的项目,由于工作原因只能是一点一点写,后续会补充完整,有疑惑可以私信我.

首先是首页面,欢迎页实现     旋转 缩放 渐变 的效果 ,三个引导页实现侧滑的同时底部的小点跟随侧滑移动.

GuideActivity.java

package com.example.lenovo.myx2_d1;
    
    import android.app.Activity;
    import android.content.Context;
    import android.media.Image;
    import android.os.Bundle;
    import android.support.annotation.Nullable;
    import android.support.v4.view.ViewPager;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.ImageView;
    import android.widget.LinearLayout;
    import android.widget.RelativeLayout;
    import java.util.ArrayList;
    import java.util.List;
    
    /**
     * Created by LENOVO on 2018/08/01.
     */
    
    public class GuideActivity extends Activity {
    
        private LinearLayout dotLayout;
        private ImageView redDot;
        private ViewPager viewPager;
        private int[] imgs = {R.drawable.guide_1, R.drawable.guide_2, R.drawable.guide_3};
        private int leftMargin =0 ;
        @Override
        protected void onCreate(@Nullable Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.guide_activity);
    
            leftMargin = dip2px(this,10f);
    
            initView();
            initLoad();
            initViewPager();
        }
    
        private List<ImageView> imgViews = new ArrayList<>();
    
        private void initViewPager(){
    
            // 把图片int集合遍历，同时创建多个ImageView,且设置图片，然后把imgView放入到imgViews集合里
    
            for (int img :imgs){
                ImageView imgView = new ImageView(this);
                imgView.setBackgroundResource(img);
                imgViews.add(imgView);
            }
            MyPager myPager = new MyPager(imgViews);
            viewPager.setAdapter(myPager);
            viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
                @Override
                public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
                    int tempMargin = leftMargin;
                    int leftMar = (int) ((position*tempMargin)+(tempMargin*positionOffset));
                    RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) redDot.getLayoutParams();
                    params.leftMargin = leftMar*2;
                    redDot.setLayoutParams(params);
                }
    
                @Override
                public void onPageSelected(int position) {
    
                }
    
                @Override
                public void onPageScrollStateChanged(int state) {
    
                }
            });
        }
        private void initView() {
            dotLayout = findViewById(R.id.dot_layout);
            redDot = findViewById(R.id.red_dot);
            viewPager = findViewById(R.id.view_pager);
        }
    
        private void initLoad() {
    
            // 添加三个点到Layout
    
            for (int x = 0; x < imgs.length; x++) {
                ImageView dot = new ImageView(this);
                dot.setBackgroundResource(R.drawable.point_normal);
                if (x != 0) {
                    LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
                    params.leftMargin = leftMargin;
    
                    dot.setLayoutParams(params);
                }
                dotLayout.addView(dot);
            }
        }
    
        /**
         * 根据手机的分辨率从 dp 的单位 转成为 px(像素)
         */
        public static int dip2px(Context context, float dpValue) {
            final float scale = context.getResources().getDisplayMetrics().density;
            return (int) (dpValue * scale + 0.5f);
        }
    }

MyPager.java

package com.example.lenovo.myx2_d1;
    
    /**
     * Created by LENOVO on 2018/08/01.
     */
    
    import android.support.annotation.NonNull;
    import android.support.v4.view.PagerAdapter;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.ImageView;
    import java.util.ArrayList;
    import java.util.Arrays;
    import java.util.List;
    
    public  class MyPager extends PagerAdapter {
    
        private List<ImageView> imgList;
    
        public MyPager(List<ImageView> imgs){
            if (imgList==null){
                imgList  = new ArrayList<>();
                imgList.addAll(imgs);
            }
        }
    
        @Override
        public int getCount() {
            return imgList.size();
        }
    
        @Override
        public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
            return view==object;
        }
    
        @NonNull // 添加子view==imageview，到container
    
        @Override
        public Object instantiateItem(@NonNull ViewGroup container, int position) {
            ImageView img=  imgList.get(position);
            container.addView(img);
            return img;
        }
    
        @Override
        public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
            container.removeView(imgList.get(position));
        }
    }

SplashActivity.java

package com.example.lenovo.myx2_d1;
    
    import android.content.Intent;
    import android.os.Bundle;
    import android.support.v7.app.AppCompatActivity;
    import android.view.animation.AlphaAnimation;
    import android.view.animation.Animation;
    import android.view.animation.AnimationSet;
    import android.view.animation.RotateAnimation;
    import android.view.animation.ScaleAnimation;
    import android.widget.RelativeLayout;
    
    /**
     * Created by LENOVO on 2018/08/01.
     */
    
    public class SplashActivity extends AppCompatActivity {
        private RelativeLayout rootLayout;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
    
            initView();
            // 实现  旋转  缩放  渐变   的效果
    
            AlphaAnimation alphaAnimation = new AlphaAnimation(0,1);
            alphaAnimation.setFillAfter(true);
    
            ScaleAnimation  scaleAnimation=new ScaleAnimation(0,1,0,1,ScaleAnimation.RELATIVE_TO_SELF,0.5f,ScaleAnimation.RELATIVE_TO_SELF,0.5f);
            scaleAnimation.setFillAfter(true);
    
            RotateAnimation rotateAnimation=new RotateAnimation(0,360,RotateAnimation.RELATIVE_TO_SELF,0.5f,RotateAnimation.RELATIVE_TO_SELF,0.5f);
            rotateAnimation.setFillAfter(true);
    
            AnimationSet animationSet = new AnimationSet(false);
            animationSet.addAnimation(alphaAnimation);
            animationSet.addAnimation(scaleAnimation);
            animationSet.addAnimation(rotateAnimation);
    
            animationSet.setDuration(2000);
            rootLayout.startAnimation(animationSet);
    
            animationSet.setAnimationListener(new Animation.AnimationListener() {
                @Override
                public void onAnimationStart(Animation animation) {
    
                }
    
                @Override
                public void onAnimationEnd(Animation animation) {
    
                    Intent intent = new Intent(SplashActivity.this,GuideActivity.class);
                    startActivity(intent);
                    finish();
                }
    
                @Override
                public void onAnimationRepeat(Animation animation) {
    
                }
            });
    
    
    
    
        }
    
        private void initView(){
            rootLayout = findViewById(R.id.root_layout);
        }
    
        private void initLoad(){
    
        }
    }

以下是布局文件

activity\_main.xml

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/root_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/splash_bg_newyear">
    
        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/splash_sheep_newyear" />
    </RelativeLayout>

content\_main.xml

<?xml version="1.0" encoding="utf-8"?>
    <android.support.constraint.ConstraintLayout
        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=".SplashActivity"
        tools:showIn="@layout/activity_main">
    
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Hello World!"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent" />
    
    </android.support.constraint.ConstraintLayout>

guide\_activity.xml

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    
        <android.support.v4.view.ViewPager
            android:id="@+id/view_pager"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
    
        <RelativeLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_centerHorizontal="true"
            android:layout_marginBottom="50dp"
            android:orientation="horizontal">
    
            <LinearLayout
                android:id="@+id/dot_layout"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:orientation="horizontal" />
    
            <ImageView
                android:id="@+id/red_dot"
                android:background="@drawable/point_red"
                android:layout_width="10dp"
                android:layout_height="10dp" />
        </RelativeLayout>
    </RelativeLayout>

values/style.xml

<resources>
    
        
        <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
            
            <item name="colorPrimary">@color/colorPrimary</item>
            <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
            <item name="colorAccent">@color/colorAccent</item>
        </style>
    
        <style name="AppTheme.NoActionBar">
            <item name="windowActionBar">false</item>
            <item name="windowNoTitle">true</item>
        </style>
    
        <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />
    
        <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />
    
    </resources>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.example.lenovo.myx2_d1">
    
        <application
            android:allowBackup="true"
            android:icon="@mipmap/ic_launcher"
            android:label="@string/app_name"
            android:roundIcon="@mipmap/ic_launcher_round"
            android:supportsRtl="true"
            android:theme="@style/AppTheme">
            <activity
                android:name=".SplashActivity"
                android:label="@string/app_name"
                android:theme="@style/AppTheme.NoActionBar">
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
            <activity android:name=".GuideActivity"></activity>
        </application>
    
    
    </manifest>

## **全部源码在我上传的资源里有，可以在那下载学习。** ##

**链接：[新闻项目][Link 1]**

[Link 1]: https://download.csdn.net/download/weixin_40783315/10753628