Question

我正在学习android开发，因为在观看教程后我创建了这个应用程序，其中使用viewpager扫描图像。但是现在如果我想在每个图像滑动上播放不同的声音？这有可能吗？这是我的代码

PageIndicatiorActivity

   package com.horizontalscrollviewwithpageindicator;

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.Menu;
import android.media.MediaPlayer;

public class PageIndicatorActivity extends Activity {
    MediaPlayer mp;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ViewPagerAdapter adapter = new ViewPagerAdapter(this, imageArra);
        ViewPager myPager = (ViewPager) findViewById(R.id.myfivepanelpager);
        myPager.setAdapter(adapter);
        myPager.setCurrentItem(0);
        myPager.setOnPageChangeListener(player);
    }

    private int[] mAudio = new int[]{R.raw.one,R.raw.two,R.raw.three,R.raw.four,R.raw.five,R.raw.six,R.raw.seven,R.raw.eight,R.raw.nine,R.raw.ten};

    private int imageArra[] = { R.drawable.no1,R.drawable.no2,R.drawable.no3,R.drawable.no4,R.drawable.no5,R.drawable.no6,R.drawable.no7,R.drawable.no8,R.drawable.no9,R.drawable.no10};

 OnPageChangeListener player = new OnPageChangeListener()
    {

        @Override
        public void onPageSelected(int arg0)
        {
            mp = MediaPlayer.create(PageIndicatorActivity.this, mAudio[arg0]);
            mp.start();
        }

        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2)
        {
        }

        @Override
        public void onPageScrollStateChanged(int arg0)
        {
        }
    };

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

}

Answer 1

我建议您让Activity或Adapter实施ViewPager.OnPageChangeListener界面。

<强> http://developer.android.com/reference/android/support/v4/view/ViewPager.OnPageChangeListener.html

查看界面的方法并在那里实现“声音”。

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

 }

 @Override
 public void onPageSelected(int position) {

 }

 @Override
 public void onPageScrollStateChanged(int state) {

 }

Answer 2

SuRaj Prince，反转调用的顺序，它应该工作，所以首先设置ChangeListener，然后调用setCurrentItem。

此外，如果您只播放短音，请使用SoundPool而不是MediaPlayer。

Answer 3

我尝试了这个现在正常运行的代码

public class Numbers extends Activity {
    MediaPlayer mp;
    MediaPlayer BG;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_numbers);
        ViewPagerAdapter adapter = new ViewPagerAdapter(this, imageArra);
        ViewPager myPager = (ViewPager) findViewById(R.id.myfivepanelpager);
        myPager.setOnPageChangeListener(player);
        myPager.setAdapter(adapter);
        myPager.setCurrentItem(0);
        BG = MediaPlayer.create(this, R.raw.jingle);
        BG.setLooping(true);
        BG.setVolume(100, 100);
        BG.start();
        mp = MediaPlayer.create(Numbers.this, mAudio[0]);
        mp.start();
    }

    @Override
    protected void onPause() {
        super.onPause();
        BG.pause();
        }

    @Override
    protected void onResume() {
    super.onResume();
    BG.start();
    }

    private int[] mAudio = new int[]{R.raw.one,
                                     R.raw.two,
                                     R.raw.three,
                                     R.raw.four,
                                     R.raw.five,
                                     R.raw.six,
                                     R.raw.seven,
                                     R.raw.eight,
                                     R.raw.nine,
                                     R.raw.ten};

    private int imageArra[] =  {R.drawable.no1,
                                R.drawable.no2,
                                R.drawable.no3,
                                R.drawable.no4,
                                R.drawable.no5,
                                R.drawable.no6,
                                R.drawable.no7,
                                R.drawable.no8,
                                R.drawable.no9,
                                R.drawable.no10};

    public  OnPageChangeListener player = new OnPageChangeListener()
    {

        @Override
        public void onPageSelected(int arg1)
        {
        mp = MediaPlayer.create(Numbers.this, mAudio[arg1]);
        mp.start();
        }

        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2)
        {
        }

        @Override
        public void onPageScrollStateChanged(int arg0)
        {
        }
    };

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.numbers, menu);
        return true;
    }

}

在浏览页面之前，ViewPager上没有播放First Sound

3 个答案: