package com.sxt.day07_09;

import java.util.ArrayList;

import java.util.HashMap;

import android.app.Activity;

import android.content.ContentResolver;

import android.content.Context;

import android.database.Cursor;

import android.graphics.Bitmap;

import android.os.Bundle;

import android.provider.MediaStore.Video;

import android.provider.MediaStore.Video.Thumbnails;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.BaseAdapter;

import android.widget.Gallery;

import android.widget.ImageView;

import android.widget.TextView;

import android.widget.VideoView;

public class MainActivity extends Activity {

    ArrayList<HashMap<String, Object>> mVideos;//M

    Gallery mGallery;//V

    VideoAdapter mAdapter;//C，用于列表显示

    VideoView mVideoView;//预览视频控件

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        getVideoInfo();

        initView();

        setListener();

    }

    private void setListener() {

        mGallery.setOnItemClickListener(new OnItemClickListener() {

            @Override

            public void onItemClick(AdapterView<?> parent, View view,

                    int position, long id) {

                HashMap<String, Object> video=mVideos.get(position);

                String path=video.get(Video.Media.DATA).toString();

                mVideoView.setVideoPath(path);//设置视频路径

                mVideoView.start();//播放

            }

        });

    }

    private void initView() {

        mVideoView=(VideoView) findViewById(R.id.vv);

        mGallery=(Gallery) findViewById(R.id.gallery);

        mAdapter=new VideoAdapter(mVideos, this);//M添加到

        mGallery.setAdapter(mAdapter);

    }

    private void getVideoInfo() {

        ContentResolver resolver = getContentResolver();

        String[] projection={

            Video.Media._ID,//拿到略缩图

            Video.Media.DATA,//sd卡路径

            Video.Media.TITLE

        };

        mVideos=new ArrayList<HashMap<String,Object>>();

        //查询的是安卓数据库，数据库存的是多媒体文件的信息

        Cursor c = resolver.query(Video.Media.EXTERNAL_CONTENT_URI, projection, null, null, null);

        while(c.moveToNext()){

            HashMap<String, Object> video=new HashMap<String, Object>();

            video.put(Video.Media._ID, c.getInt(c.getColumnIndex(Video.Media._ID)));

            video.put(Video.Media.DATA, c.getString(c.getColumnIndex(Video.Media.DATA)));

            video.put(Video.Media.TITLE, c.getString(c.getColumnIndex(Video.Media.TITLE)));

            mVideos.add(video);

        }

    }

    //适配器，用于列表显示

    class VideoAdapter extends BaseAdapter{

        ArrayList<HashMap<String, Object>> videos;

        Context context;

        public VideoAdapter(ArrayList<HashMap<String, Object>> videos,

                Context context) {

            super();

            this.videos = videos;

            this.context = context;

        }

        @Override

        public int getCount() {

            return videos.size();

        }

        @Override

        public Object getItem(int position) {

            // TODO Auto-generated method stub

            return null;

        }

        @Override

        public long getItemId(int position) {

            // TODO Auto-generated method stub

            return 0;

        }

        @Override

        //没有用缓存做优化

        public View getView(int position, View layout, ViewGroup parent) {

            layout=View.inflate(context, R.layout.item_video, null);

            ImageView ivThumb=(ImageView) layout.findViewById(R.id.ivThumb);//显示视频略缩图

            TextView tvTitle=(TextView) layout.findViewById(R.id.tvTitle);//视频标题

            HashMap<String, Object> video=videos.get(position);

            tvTitle.setText(video.get(Video.Media.TITLE).toString());

            int id=(Integer) video.get(Video.Media._ID);

            //Thumbnails类用于获取视频或者图片的略缩图，

            Bitmap bm=Thumbnails.getThumbnail(getContentResolver(), id, Thumbnails.MICRO_KIND, null);

            ivThumb.setImageBitmap(bm);

            return layout;

        }

    }

}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent" >

    <Gallery                                    水平滚动

        android:id="@+id/gallery"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" />

    <VideoView                             预览播放视频控件

        android:id="@+id/vv"

        android:layout_below="@id/gallery"

        android:layout_width="match_parent"

        android:layout_height="match_parent"/>

</RelativeLayout>

item_view.xml

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:orientation="vertical" >

    <ImageView                                 每一项布局

        android:id="@+id/ivThumb"

        android:layout_width="80dp"

        android:layout_height="80dp"

        android:src="@drawable/ic_launcher"/>

    <TextView

        android:id="@+id/tvTitle"

        android:layout_width="80dp"

        android:layout_height="wrap_content"

        android:text="安卓"

        android:gravity="center_horizontal"/>

</LinearLayout>