Android实现新闻项目

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 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 imgList;

    public MyPager(List 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

content_main.xml

guide_activity.xml

values/style.xml