day06 轮播图

布局

<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=".MainActivity">

    <androidx.viewpager.widget.ViewPager
        android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="500dp">
    </androidx.viewpager.widget.ViewPager>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="50dp"
        android:layout_below="@id/pager"
        android:layout_centerHorizontal="true">

        <ImageView
            android:id="@+id/image_i"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:src="@mipmap/i"
            android:layout_marginTop="5dp"
            android:layout_marginLeft="10dp"/>

        <ImageView
            android:id="@+id/image_j"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:src="@mipmap/j"
            android:layout_marginTop="5dp"
            android:layout_marginLeft="10dp"/>

        <ImageView
            android:id="@+id/image_r"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:src="@mipmap/r"
            android:layout_marginTop="5dp"
            android:layout_marginLeft="10dp"/>

        <ImageView
            android:id="@+id/image_w"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:src="@mipmap/w"
            android:layout_marginTop="5dp"
            android:layout_marginLeft="10dp"/>

        <ImageView
            android:id="@+id/image_x"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:src="@mipmap/x"
            android:layout_marginTop="5dp"
            android:layout_marginLeft="10dp"/>

        <ImageView
            android:id="@+id/image_g"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:src="@mipmap/g"
            android:layout_marginTop="5dp"
            android:layout_marginLeft="10dp"/>

        <ImageView
            android:id="@+id/image_c"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:src="@mipmap/c"
            android:layout_marginTop="5dp"
            android:layout_marginLeft="10dp"/>

        <ImageView
            android:id="@+id/image_u"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:src="@mipmap/u"
            android:layout_marginTop="5dp"
            android:layout_marginLeft="10dp"/>


    </LinearLayout>

</RelativeLayout>

java代码

适配器

import android.content.Context;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

import androidx.annotation.NonNull;
import androidx.viewpager.widget.PagerAdapter;

import java.util.List;

public class MyPagerAdapter extends PagerAdapter {

    private Context context;
    private List<ImageView> lists;

    public MyPagerAdapter(Context context, List<ImageView> lists) {
        this.context = context;
        this.lists = lists;
    }

    @Override
    public int getCount() {
        return Integer.MAX_VALUE;
    }

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

    @NonNull
    @Override
    public Object instantiateItem(@NonNull ViewGroup container, int position) {
        Log.i("TAG",position + "加载了:");
        ImageView imageView = lists.get(position%lists.size());
        container.addView(imageView);
        return imageView;
    }

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


}

Activity代码

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.viewpager.widget.ViewPager;

import android.media.Image;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.ImageView;

import java.util.ArrayList;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;

public class MainActivity extends AppCompatActivity {

    private ViewPager viewPager;
    private List<ImageView> img;
    private List<ImageView> img1 = new ArrayList<>();
    private MyPagerAdapter adapter;
    private ImageView image_i,image_j,image_r,image_w,image_x,image_g,image_c,image_u;
    private int current_page = 0;
    private Handler handler = new Handler(){
        @Override
        public void handleMessage(@NonNull Message msg) {

            int currentItem = viewPager.getCurrentItem();
            viewPager.setCurrentItem(currentItem + 1);

        }
    };

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

        img = new ArrayList<ImageView>();
        image_i = findViewById(R.id.image_i);
        image_j = findViewById(R.id.image_j);
        image_r = findViewById(R.id.image_r);
        image_w = findViewById(R.id.image_w);
        image_x = findViewById(R.id.image_x);
        image_g = findViewById(R.id.image_g);
        image_c = findViewById(R.id.image_c);
        image_u = findViewById(R.id.image_u);
        viewPager = findViewById(R.id.pager);

        view();
        icon();

        adapter = new MyPagerAdapter(this,img);

        viewPager.setAdapter(adapter);

//        viewPager.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 < img1.size(); i++) {
//                    img1.get(i).setImageResource(R.mipmap.z);
//                }
//                img1.get(position).setImageResource(R.mipmap.y);
//            }
//
//            @Override
//            public void onPageScrollStateChanged(int state) {
//
//            }
//        });

        Timer timer = new Timer();
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                if (current_page != img.size()){
                    handler.sendEmptyMessage(1);
                }else {
                    handler.sendEmptyMessage(2);
                }
            }
        },0,2000);

    }

    private void view() {

//        ImageView imageView = new ImageView(this);
//        imageView.setImageResource(R.mipmap.i);
//        ImageView imageView1 = new ImageView(this);
//        imageView1.setImageResource(R.mipmap.j);
//        ImageView imageView2 = new ImageView(this);
//        imageView2.setImageResource(R.mipmap.r);
//        ImageView imageView3 = new ImageView(this);
//        imageView3.setImageResource(R.mipmap.w);
//        ImageView imageView4 = new ImageView(this);
//        imageView4.setImageResource(R.mipmap.x);
//        ImageView imageView5 = new ImageView(this);
//        imageView5.setImageResource(R.mipmap.g);
//        ImageView imageView6 = new ImageView(this);
//        imageView6.setImageResource(R.mipmap.c);
//        ImageView imageView7 = new ImageView(this);
//        imageView7.setImageResource(R.mipmap.u);
//        img.add(imageView);
//        img.add(imageView1);
//        img.add(imageView2);
//        img.add(imageView3);
//        img.add(imageView4);
//        img.add(imageView5);
//        img.add(imageView6);
//        img.add(imageView7);

        int[] image = new int[]{R.mipmap.i,R.mipmap.j,R.mipmap.r,R.mipmap.w,R.mipmap.x,R.mipmap.g,R.mipmap.c,R.mipmap.u};
        for (int i = 0; i < image.length; i++) {
            ImageView imageView = new ImageView(this);
            imageView.setImageResource(image[i]);
            img.add(imageView);
        }

    }

    private void icon() {

        img1.add(image_i);
        img1.add(image_j);
        img1.add(image_r);
        img1.add(image_w);
        img1.add(image_x);
        img1.add(image_g);
        img1.add(image_c);
        img1.add(image_u);

    }
}

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