Android MediaStore检索视频并播放

该文章是为了检索手机上sd卡中的视频，然后将检索出来的相应视频的缩略图，名称等视频信息显示在ListView上。点击每个item后播放相应的视频。

源代码：

布局文件：

activity_main:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </ListView>

</RelativeLayout>

list_item:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

代码文件：

MainActivity.java：

package com.multimediademo13mediastore;

import java.io.File;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;

public class MainActivity extends Activity implements OnItemClickListener {
	private ListView listView;
	private Cursor cursor;

	@SuppressWarnings("deprecation")
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		listView = (ListView) findViewById(R.id.listView);
		/**
		 * 从MediaStore.Video.Thumbnail查询中获得的列的列表。
		 */
		String[] thumbColumns = { MediaStore.Video.Thumbnails.DATA,
				MediaStore.Video.Thumbnails.VIDEO_ID };
		/**
		 * 从MediaStore.Video.Media查询中获得的列的列表。
		 */
		String[] mediaColumns = { MediaStore.Video.Media._ID,
				MediaStore.Video.Media.DATA, MediaStore.Video.Media.TITLE,
				MediaStore.Video.Media.MIME_TYPE };
		/**
		 * 在主查询中将选择所有在MediaStore中表示的视频
		 */
		cursor = managedQuery(MediaStore.Video.Media.EXTERNAL_CONTENT_URI,
				mediaColumns, null, null, null);
		ArrayList<VideoViewInfo> videoRows = new ArrayList<VideoViewInfo>();
		if (cursor.moveToFirst()) {
			do {
				VideoViewInfo newVVI = new VideoViewInfo();
				/**
				 * 将使用另一个查询为每个视频提取缩略图，而且这些数据块都将存储在VideoViewInfo对象中。
				 */
				int id = cursor.getInt(cursor
						.getColumnIndex(MediaStore.Video.Media._ID));
				Cursor thumbCursor = managedQuery(
						MediaStore.Video.Thumbnails.EXTERNAL_CONTENT_URI,
						thumbColumns, MediaStore.Video.Thumbnails.VIDEO_ID
								+ "=" + id, null, null);
				if (thumbCursor.moveToFirst()) {
					newVVI.thumbPath = thumbCursor.getString(thumbCursor
							.getColumnIndex(MediaStore.Video.Thumbnails.DATA));
				}
				newVVI.filePath = cursor.getString(cursor
						.getColumnIndexOrThrow(MediaStore.Video.Media.DATA));
				newVVI.title = cursor.getString(cursor
						.getColumnIndexOrThrow(MediaStore.Video.Media.TITLE));
				newVVI.mimeType = cursor
						.getString(cursor
								.getColumnIndexOrThrow(MediaStore.Video.Media.MIME_TYPE));

				videoRows.add(newVVI);
			} while (cursor.moveToNext());
		}
		listView.setAdapter(new VideoGalleryAdapter(this, videoRows));
		listView.setOnItemClickListener(this);
	}

	/**
	 * 这个方法将从Cursor对象中提取所需的数据，点击一个item，将创建一个意图，以启动手机设备上默认的媒体播放器来播放该item视频。
	 */
	@Override
	public void onItemClick(AdapterView<?> parent, View view, int position,
			long id) {
		if (cursor.moveToPosition(position)) {
			int fileColumn = cursor
					.getColumnIndexOrThrow(MediaStore.Video.Media.DATA);
			int mimeColumn = cursor
					.getColumnIndexOrThrow(MediaStore.Video.Media.MIME_TYPE);
			String videoFilePath = cursor.getString(fileColumn);
			String mimeType = cursor.getString(mimeColumn);

			Intent intent = new Intent(android.content.Intent.ACTION_VIEW);
			File newFile = new File(videoFilePath);
			intent.setDataAndType(Uri.fromFile(newFile), mimeType);

			startActivity(intent);
		}
	}
}

VideoViewInfo.java：

package com.multimediademo13mediastore;

public class VideoViewInfo {
	String filePath;
	String mimeType;
	String thumbPath;
	String title;
}

VideoGalleryAdapter.java：

package com.multimediademo13mediastore;

import java.util.ArrayList;

import android.content.Context;
import android.net.Uri;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
/**
 * ListView适配器
 * @author Administrator
 *
 */
public class VideoGalleryAdapter extends BaseAdapter{
	private Context context;
	private ArrayList<VideoViewInfo> videoRows;
	LayoutInflater inflater;
	public VideoGalleryAdapter(Context context,
			ArrayList<VideoViewInfo> videoRows) {
		this.context = context;
		this.videoRows = videoRows;
		inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
	}

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

	@Override
	public Object getItem(int position) {
		return null;
	}

	@Override
	public long getItemId(int position) {
		return 0;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		View videoRow = inflater.inflate(R.layout.list_item, null);
		ImageView videoThumb = (ImageView) videoRow.findViewById(R.id.imageView);
		if (videoRows.get(position).thumbPath != null) {
			videoThumb.setImageURI(Uri.parse(videoRows.get(position).thumbPath));
		}
		TextView videoTitle = (TextView) videoRow.findViewById(R.id.textView);
		videoTitle.setText(videoRows.get(position).title);
		return videoRow;
	}

}

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