轮播图相关配件

最新推荐文章于 2024-09-28 18:33:28 发布

weixin_43915921

最新推荐文章于 2024-09-28 18:33:28 发布

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文章标签：轮播图

本文链接：https://blog.youkuaiyun.com/weixin_43915921/article/details/90488965

博客介绍了轮播图的实现，包含先展示效果，接着阐述布局文件、主类的相关内容，还提及自定义类实现PageAdapter，最后有效果2及Xml文件相关信息。

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先看效果吧

在这里插入图片描述

布局文件

<?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=".Main2Activity">

    <android.support.v4.view.ViewPager
        android:id="@+id/viewP"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

        <android.support.v4.view.PagerTabStrip
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">
            
        </android.support.v4.view.PagerTabStrip>
    </android.support.v4.view.ViewPager>

</RelativeLayout>

主类

package com.example.part_twelve_list_dialog;

import android.support.v4.app.Fragment;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ImageView;

import java.util.ArrayList;

public class Main2Activity extends AppCompatActivity {


    ViewPager viewPager;
    ArrayList<String>arrayList=new ArrayList<>();
    ArrayList<ImageView>imageViews=new ArrayList<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        viewPager=findViewById(R.id.viewP);

        ImageView imageView = new ImageView(this);
        imageView.setImageResource(R.drawable.yi);
        ImageView imageView2 = new ImageView(this);
        imageView2.setImageResource(R.drawable.er);
        ImageView imageView3 = new ImageView(this);
        imageView3.setImageResource(R.drawable.san);


        for(int i=0;i<3;i++){
            arrayList.add("金人"+i);
        }

        imageViews.add(imageView);
        imageViews.add(imageView2);
        imageViews.add(imageView3);
        
        MyPageAdapter myPageAdapter = new MyPageAdapter(arrayList, imageViews);
        myPageAdapter.notifyDataSetChanged();
        viewPager.setAdapter(myPageAdapter);
    }
}

自定义类实现PageAdapter

package com.example.part_twelve_list_dialog;

import android.media.Image;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

import java.util.ArrayList;

class MyPageAdapter extends PagerAdapter {

    ArrayList<String>arrayList;
    ArrayList<ImageView>images;

    public MyPageAdapter(ArrayList<String> arrayList, ArrayList<ImageView> imageViews) {
        this.arrayList=arrayList;
        this.images=imageViews;
    }

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

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

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

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

    @Nullable
    @Override
    public CharSequence getPageTitle(int position) {
        return arrayList.get(position);
    }
}

效果2

在这里插入图片描述

Xml文件

<?xml version="1.0" encoding="utf-8"?>

        <LinearLayout
            android:id="@+id/layout_01"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            >
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="第一个界面"
                />
        </LinearLayout>
        <LinearLayout
            android:id="@+id/layout_02"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            >
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="第二个界面"
                />
        </LinearLayout>
        <LinearLayout
            android:id="@+id/layout_03"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            >
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="第三个界面"
                />
        </LinearLayout>
    </FrameLayout>
</LinearLayout>

## 主类

package com.example.part_twelve_list_dialog;

import android.app.TabActivity;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TabHost;
import android.widget.Toast;

public class Main3Activity extends TabActivity {

    private TabHost tabHost;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);
        tabHost=getTabHost();
        tabHost.addTab(tabHost.newTabSpec("t1").setIndicator("新闻").setContent(R.id.layout_01));
        tabHost.addTab(tabHost.newTabSpec("t2").setIndicator("故事").setContent(R.id.layout_02));
        tabHost.addTab(tabHost.newTabSpec("t3").setIndicator("娱乐").setContent(R.id.layout_03));

        tabHost.getChildAt(0).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(Main3Activity.this, "点界面1啦!", Toast.LENGTH_SHORT).show();
            }
        });
    }
}