Android实现广告页图片无限轮播

一.概述

对于一个联网的Android应用, 首页广告无限轮播基本已经成为标配了.

那么它是怎么实现的呢?

有几种实现方式呢?

二.无限轮播的实现

1.最常规的手段是用 ViewPager来实现

2.比较原始的手段是: Gallery 画廊来实现

3.最简单的实现手段是: Android image slider第三方库

下面由简到难依次实现

第三方库 Android image slider

github:https://github.com/daimajia/AndroidImageSlider/

Android实现广告页图片无限轮播

只看图片就发现,非常绚丽, 有很多轮播方式可以选择,并且指示器图标也有很多选择方式, DIY 非常*化.

步骤一:如果用AS开发需引入下面的库:

dependencies {

        compile "com.android.support:support-v4:+"

        compile 'com.squareup.picasso:picasso:2.3.2'

        compile 'com.nineoldandroids:library:2.4.0'

        compile 'com.daimajia.slider:library:1.1.5@aar'

}

步骤二:添加权限:

<!-- if you want to load images from the internet -->

<uses-permission android:name="android.permission.INTERNET" /> 

<!-- if you want to load images from a file OR from the internet -->

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

步骤三: xml 的写法

Add the Slider to your layout:

<com.daimajia.slider.library.SliderLayout

        android:id="@+id/slider"

        android:layout_width="match_parent"

        android:layout_height="200dp"

/>

There are some default indicators. If you want to use a provided indicator:

<com.daimajia.slider.library.Indicators.PagerIndicator

        android:id="@+id/custom_indicator"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:gravity="center"

        />

最后奉上代码:

package com.daimajia.slider.demo;

import android.content.Intent;

import android.net.Uri;

import android.os.Bundle;

import android.support.v7.app.ActionBarActivity;

import android.util.Log;

import android.view.Menu;

import android.view.MenuInflater;

import android.view.MenuItem;

import android.view.View;

import android.widget.AdapterView;

import android.widget.ListView;

import android.widget.TextView;

import android.widget.Toast;

import com.daimajia.slider.library.Animations.DescriptionAnimation;

import com.daimajia.slider.library.Indicators.PagerIndicator;

import com.daimajia.slider.library.SliderLayout;

import com.daimajia.slider.library.SliderTypes.BaseSliderView;

import com.daimajia.slider.library.SliderTypes.TextSliderView;

import com.daimajia.slider.library.Tricks.ViewPagerEx;

import java.util.HashMap;

public class MainActivity extends ActionBarActivity implements BaseSliderView.OnSliderClickListener, ViewPagerEx.OnPageChangeListener{

    private SliderLayout mDemoSlider;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        mDemoSlider = (SliderLayout)findViewById(R.id.slider);

        HashMap<String,String> url_maps = new HashMap<String, String>();

        url_maps.put("Hannibal", "http://static2.hypable.com/wp-content/uploads/2013/12/hannibal-season-2-release-date.jpg");

        url_maps.put("Big Bang Theory", "http://tvfiles.alphacoders.com/100/hdclearart-10.png");

        url_maps.put("House of Cards", "http://cdn3.nflximg.net/images/3093/2043093.jpg");

        url_maps.put("Game of Thrones", "http://images.boomsbeat.com/data/images/full/19640/game-of-thrones-season-4-jpg.jpg");

        HashMap<String,Integer> file_maps = new HashMap<String, Integer>();

        file_maps.put("Hannibal",R.drawable.hannibal);

        file_maps.put("Big Bang Theory",R.drawable.bigbang);

        file_maps.put("House of Cards",R.drawable.house);

        file_maps.put("Game of Thrones", R.drawable.game_of_thrones);

        for(String name : file_maps.keySet()){

            TextSliderView textSliderView = new TextSliderView(this);

            // initialize a SliderLayout

            textSliderView

                    .description(name)

                    .image(file_maps.get(name))

                    .setScaleType(BaseSliderView.ScaleType.Fit)

                    .setOnSliderClickListener(this);

            //add your extra information

            textSliderView.bundle(new Bundle());

            textSliderView.getBundle()

                        .putString("extra",name);

           mDemoSlider.addSlider(textSliderView);

        }

        mDemoSlider.setPresetTransformer(SliderLayout.Transformer.Accordion);

        mDemoSlider.setPresetIndicator(SliderLayout.PresetIndicators.Center_Bottom);

        mDemoSlider.setCustomAnimation(new DescriptionAnimation());

        mDemoSlider.setDuration(4000);

        mDemoSlider.addOnPageChangeListener(this);

        ListView l = (ListView)findViewById(R.id.transformers);

        l.setAdapter(new TransformerAdapter(this));

        l.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override

            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                mDemoSlider.setPresetTransformer(((TextView) view).getText().toString());

                Toast.makeText(MainActivity.this, ((TextView) view).getText().toString(), Toast.LENGTH_SHORT).show();

            }

        });

    }

    @Override

    protected void onStop() {

        // To prevent a memory leak on rotation, make sure to call stopAutoCycle() on the slider before activity or fragment is destroyed

        mDemoSlider.stopAutoCycle();

        super.onStop();

    }

    @Override

    public void onSliderClick(BaseSliderView slider) {

        Toast.makeText(this,slider.getBundle().get("extra") + "",Toast.LENGTH_SHORT).show();

    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        MenuInflater menuInflater = getMenuInflater();

        menuInflater.inflate(R.menu.main,menu);

        return super.onCreateOptionsMenu(menu);

    }

    @Override

    public boolean onOptionsItemSelected(MenuItem item) {

        switch (item.getItemId()){

            case R.id.action_custom_indicator:

                mDemoSlider.setCustomIndicator((PagerIndicator) findViewById(R.id.custom_indicator));

                break;

            case R.id.action_custom_child_animation:

                mDemoSlider.setCustomAnimation(new ChildAnimationExample());

                break;

            case R.id.action_restore_default:

                mDemoSlider.setPresetIndicator(SliderLayout.PresetIndicators.Center_Bottom);

                mDemoSlider.setCustomAnimation(new DescriptionAnimation());

                break;

            case R.id.action_github:

                Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("https://github.com/daimajia/AndroidImageSlider"));

                startActivity(browserIntent);

                break;

        }

        return super.onOptionsItemSelected(item);

    }

    @Override

    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}

    @Override

    public void onPageSelected(int position) {

        Log.d("Slider Demo", "Page Changed: " + position);

    }

    @Override

    public void onPageScrollStateChanged(int state) {}

}

注意一点: 如果图片不带标题, 可以使用DefaultSliderView , 如果图片有标题就用TextSliderView

分割线-------------------------------------------------------------------------------------------------------

方式2: 使用Gallery 画廊来实现图片无限轮播

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Android实现广告页图片无限轮播

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