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/

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 非常自由化.

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

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方式2: 使用Gallery 画廊来实现图片无限轮播