ListView与SimpleCursorAdapter实现视频列表

最新推荐文章于 2020-12-19 15:59:38 发布

paltan

最新推荐文章于 2020-12-19 15:59:38 发布

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本文链接：https://blog.youkuaiyun.com/paltan/article/details/48805149

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新手试验品
想做一个视频列表，可以获取本地所有视频，并可以进行删除。之前用过自定义BaseAdapter，数据为静态的，不能及时更新系统数据，查了资料才知道应该用CursorAdapter。
以下实现的视频列表，会显示视频的缩略图、标题、时长和大小；单击Item会启动另一个Activity进行播放，长按Item会出现CheckBox和编辑功能布局，并有一个反选功能。
视频的缩略图加载使用缓存和延迟加载，是改造别人的，原地址为：http://blog.youkuaiyun.com/binyao02123202/article/details/8175345
（视频列表只是自己试验品的一个部分，没有独立出来检测是否可以运行）

package com.example.video;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.v4.widget.SimpleCursorAdapter;
import android.view.KeyEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemLongClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.RelativeLayout.LayoutParams;

public class VideoActivity extends Activity {

	private Cursor videoCursor;
	private ListView videoListView;
	private VideoAdapter videoAdapter;

	private RelativeLayout layout_edit;
	private Button cancel, delete, reverse;
	private boolean edit_visiable = false;

	private RemoteImageHelper imageHelper = new RemoteImageHelper();

	private List<Long> selectedVideos = new ArrayList<Long>();

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.video_listview);

		initViews();
	}

	private void initViews() {
		initListView();
		initListEmptyView();

		layout_edit = (RelativeLayout) findViewById(R.id.layout_edit);
		cancel = (Button) findViewById(R.id.video_edit_cancel);
		delete = (Button) findViewById(R.id.video_edit_delete);
		reverse = (Button) findViewById(R.id.video_edit_reverse);

		setClickListeners();
	}

	@SuppressWarnings("static-access")
	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (edit_visiable && event.KEYCODE_BACK == keyCode) {
			hideEditLayout();
			return true;
		}

		return super.onKeyDown(keyCode, event);
	}

	private void initListView() {
		final Uri sourceUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
		String[] projection = { MediaStore.Video.Media._ID,
				MediaStore.Video.Media.DATA, MediaStore.Video.Media.TITLE,
				MediaStore.Video.Media.DISPLAY_NAME,
				MediaStore.Video.Media.SIZE, MediaStore.Video.Media.DURATION };

		String orderBy = MediaStore.Video.Media.TITLE;

		videoCursor = getContentResolver().query(sourceUri, projection, null,
				null, orderBy);
		String[] from = { MediaStore.Video.Media.TITLE,
				MediaStore.Video.Media.DURATION, MediaStore.Video.Media.SIZE };
		int[] to = { R.id.video_title, R.id.video_duration, R.id.video_size };

		videoListView = (ListView) findViewById(R.id.video_listview);
		videoAdapter = new VideoAdapter(this, R.layout.video_list_item,
				videoCursor, from, to);
		videoListView.setAdapter(videoAdapter);
		videoListView.setScrollBarStyle(1);
	}

	private void initListEmptyView() {
		TextView emptyView = new TextView(this);
		LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT,
				LayoutParams.WRAP_CONTENT);
		params.addRule(RelativeLayout.CENTER_HORIZONTAL);
		params.addRule(RelativeLayout.CENTER_VERTICAL);
		emptyView.setLayoutParams(params);
		emptyView.setText("没有视频资源");
		emptyView.setVisibility(View.GONE);
		((ViewGroup) videoListView.getParent()).addView(emptyView);
		videoListView.setEmptyView(emptyView);
	}

	private void setClickListeners() {
		videoListView.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				if (edit_visiable) {
					ViewItemHolder holder = (ViewItemHolder) view.getTag();
					holder.cb.toggle();
					if (holder.cb.isChecked()) {
						selectedVideos.add(holder.id);
					} else {
						if (selectedVideos.contains(holder.id)) {
							selectedVideos.remove(holder.id);
						}
					}
				} else {
					// play the video
					// .....
					ViewItemHolder holder = (ViewItemHolder) view.getTag();
					Intent intent = new Intent();
					intent.setAction("com.example.VIDEOPLAY");
					intent.putExtra("VideoUri", holder.Url);
					VideoActivity.this.startActivity(intent);
				}
			}
		});

		videoListView.setOnItemLongClickListener(new OnItemLongClickListener() {

			@Override
			public boolean onItemLongClick(AdapterView<?> parent, View view,
					int position, long id) {
				if (edit_visiable) {
					hideEditLayout();
				} else {
					showEditLayout();
				}
				return true;
			}
		});

		cancel.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View v) {
				hideEditLayout();
			}
		});

		delete.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View v) {
				for (int i = 0; i < selectedVideos.size(); i++) {
					String where = android.provider.MediaStore.Video.Media._ID
							+ "='" + selectedVideos.get(i) + "'";

					getContentResolver()
							.delete(android.provider.MediaStore.Video.Media.EXTERNAL_CONTENT_URI,
									where, null);
				}

				hideEditLayout();
			}
		});

		reverse.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View v) {
				for (int i = 0; i < videoAdapter.getCount(); i++) {
					long itemId = videoAdapter.getItemId(i);
					if (selectedVideos.contains(itemId)) {
						selectedVideos.remove(itemId);
					} else {
						selectedVideos.add(itemId);
					}
				}
				videoAdapter.notifyDataSetInvalidated();

				Toast.makeText(VideoActivity.this,
						"已选中" + selectedVideos.size() + "项", Toast.LENGTH_LONG)
						.show();
			}
		});
	}

	private void showEditLayout() {
		RelativeLayout.LayoutParams params = (LayoutParams) videoListView
				.getLayoutParams();
		params.bottomMargin = 100;
		videoListView.setLayoutParams(params);

		layout_edit.setVisibility(View.VISIBLE);
		edit_visiable = true;
		selectedVideos.clear();
		videoAdapter.notifyDataSetInvalidated();
	}

	private void hideEditLayout() {
		RelativeLayout.LayoutParams params = (LayoutParams) videoListView
				.getLayoutParams();
		params.bottomMargin = 0;
		videoListView.setLayoutParams(params);

		layout_edit.setVisibility(View.INVISIBLE);
		edit_visiable = false;
		selectedVideos.clear();
		videoAdapter.notifyDataSetInvalidated();
	}

	class VideoAdapter extends SimpleCursorAdapter {
		// private Cursor c;
		// private int layout;
		// private final LayoutInflater inflater;
		private ViewItemHolder holder;

		@SuppressWarnings("deprecation")
		public VideoAdapter(Context context, int layout, Cursor c,
				String[] from, int[] to) {
			super(context, layout, c, from, to);

			// this.c = c;
			// this.layout = layout;
			// this.inflater = LayoutInflater.from(context);
		}

		@Override
		public View newView(Context context, Cursor cursor, ViewGroup parent) {
			return super.newView(context, cursor, parent);
		}

		@Override
		public void bindView(View view, Context context, Cursor cursor) {
			super.bindView(view, context, cursor);

			holder = (ViewItemHolder) view.getTag();

			if (holder == null) {
				holder = new ViewItemHolder();

				holder.imageView = (ImageView) view
						.findViewById(R.id.video_thumbnail);
				holder.titleView = (TextView) view
						.findViewById(R.id.video_title);
				holder.durationView = (TextView) view
						.findViewById(R.id.video_duration);
				holder.sizeView = (TextView) view.findViewById(R.id.video_size);

				holder.cb = (CheckBox) view.findViewById(R.id.video_checkbox);

				view.setTag(holder);
			}

			holder.imageIndex = cursor
					.getColumnIndexOrThrow(MediaStore.Video.Media._ID);
			holder.titleIndex = cursor
					.getColumnIndexOrThrow(MediaStore.Video.Media.TITLE);
			holder.durationIndex = cursor
					.getColumnIndexOrThrow(MediaStore.Video.Media.DURATION);
			holder.sizeIndex = cursor
					.getColumnIndexOrThrow(MediaStore.Video.Media.SIZE);
			holder.UrlIndex = cursor
					.getColumnIndexOrThrow(MediaStore.Video.Media.DATA);

			String title = cursor.getString(holder.titleIndex);
			long duration = cursor.getLong(holder.durationIndex);
			long size = cursor.getLong(holder.sizeIndex);
			holder.titleView.setText(FormatHelper.formatTitle(title, 20));
			holder.durationView.setText(FormatHelper.formatDuration(duration));
			holder.sizeView.setText(FormatHelper.formatSize(size));

			holder.Url = cursor.getString(holder.UrlIndex);
			holder.id = cursor.getInt(holder.imageIndex);

			imageHelper.loadBitmap(getContentResolver(), holder.imageView,
					holder.id);

			if (edit_visiable) {
				holder.cb.setVisibility(View.VISIBLE);
				holder.sizeView.setVisibility(View.GONE);

				holder.cb.setChecked(selectedVideos.contains(holder.id));
			} else {
				holder.cb.setVisibility(View.GONE);
				holder.sizeView.setVisibility(View.VISIBLE);
			}
		}
	}

	class ViewItemHolder {

		public ViewItemHolder() {
		}

		public ViewItemHolder(ImageView img, TextView title, TextView duration,
				TextView size, CheckBox ceb) {
			imageView = img;
			titleView = title;
			durationView = duration;
			sizeView = size;
			cb = ceb;
		}

		ImageView imageView;
		TextView titleView, durationView, sizeView;
		CheckBox cb;

		String Url;
		long id;

		int imageIndex;
		int titleIndex;
		int durationIndex;
		int sizeIndex;
		int UrlIndex;

	}
}

缩略图的直接获取可以这样：

private Bitmap getThumbnail(ContentResolver contentResolver, long id) {
		Bitmap thumbnail = null;
		thumbnail = MediaStore.Video.Thumbnails.getThumbnail(contentResolver,
				id, MediaStore.Video.Thumbnails.MINI_KIND, null);

		return thumbnail;
	}

列表布局：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#FFFFFF" >

    <RelativeLayout
        android:id="@+id/video_act_title"
        android:layout_width="fill_parent"
        android:layout_height="60dip"
        android:background="#FA9638"
        android:orientation="horizontal" >

        <TextView
            android:id="@+id/video_tv"
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:layout_centerInParent="true"
            android:gravity="center"
            android:text="视频列表"
            android:textColor="#FFFFFF"
            android:textSize="@dimen/bookname_size" />
    </RelativeLayout>


    <ListView
        android:id="@+id/video_listview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/video_act_title" >
    </ListView>

    <RelativeLayout
        android:id="@+id/layout_edit"
        android:layout_width="wrap_content"
        android:layout_height="50dp"
        android:layout_alignParentBottom="true"
        android:background="#EEEEEE"
        android:visibility="gone" >

        <Button
            android:id="@+id/video_edit_cancel"
            android:layout_width="80dp"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_centerVertical="true"
            android:background="#00000000"
            android:text="取消" />
        
        <Button
            android:id="@+id/video_edit_reverse"
            android:layout_width="80dp"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:text="反选" 
            android:background="#00000000" />

        <Button
            android:id="@+id/video_edit_delete"
            android:layout_width="80dp"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_alignParentRight="true"
            android:background="#00000000"
            android:text="删除" />
    </RelativeLayout>

</RelativeLayout>

ListItem布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:padding="10dp" >

    <RelativeLayout
        android:id="@+id/video_item_detail"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <ImageView
            android:id="@+id/video_thumbnail"
            android:layout_width="150dp"
            android:layout_height="90dp"
            android:scaleType="center"
            android:adjustViewBounds="true"
            android:background="@drawable/bg_border1"
            android:src="@drawable/load_music" />

        <TextView
            android:id="@+id/video_title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignTop="@+id/video_thumbnail"
            android:layout_marginLeft="10dp"
            android:layout_marginTop="3dp"
            android:layout_toRightOf="@id/video_thumbnail"
            android:text="title" />

        <TextView
            android:id="@+id/video_duration"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBottom="@+id/video_thumbnail"
            android:layout_alignLeft="@id/video_title"
            android:layout_marginBottom="3dp"
            android:text="duration" />

        <TextView
            android:id="@+id/video_size"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBottom="@+id/video_thumbnail"
            android:layout_alignParentRight="true"
            android:layout_marginBottom="3dp"
            android:text="size" />
    </RelativeLayout>

    <CheckBox
        android:id="@+id/video_checkbox"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:clickable="false"
        android:focusable="false"
        android:focusableInTouchMode="false"
        android:visibility="gone" />

</RelativeLayout>

public class RemoteImageHelper {

	private LruCache<Long, Bitmap> bitmapCache;

	private void initLruCache() {
		if (bitmapCache == null) {
			int maxMemory = (int) Runtime.getRuntime().maxMemory();
			int cacheSize = maxMemory / 8;
			bitmapCache = new LruCache<Long, Bitmap>(cacheSize) {
				@Override
				protected int sizeOf(Long key, Bitmap value) {
					return value.getByteCount();
				}
			};
		}
	}

	public void loadBitmap(ContentResolver pContentResolver,
			final ImageView imageView, final long id) {
		loadBitmap(pContentResolver, imageView, id, true);
	}

	public void loadBitmap(final ContentResolver pContentResolver,
			final ImageView imageView, final long id, boolean useCache) {

		initLruCache();

		Bitmap thumb = bitmapCache.get(id);
		if (useCache && thumb != null) {
			imageView.setImageBitmap(thumb);
			return;
		}

		// You may want to show a "Loading" image here
		imageView.setImageResource(R.drawable.image_indicator);

		LoadBitmapTask loadBitmapTask = new LoadBitmapTask();
		loadBitmapTask.execute(new LoadBitmapParams(pContentResolver, id,
				imageView));

		
	}

	private Bitmap getThumbnail(ContentResolver contentResolver, long id) {
		Bitmap thumbnail = null;
		thumbnail = MediaStore.Video.Thumbnails.getThumbnail(contentResolver,
				id, MediaStore.Video.Thumbnails.MINI_KIND, null);

		return thumbnail;
	}

	class LoadBitmapTask extends AsyncTask<LoadBitmapParams, Void, Bitmap> {
		private ImageView imageView;

		@Override
		protected Bitmap doInBackground(LoadBitmapParams... params) {
			imageView = params[0].imageView;
			Bitmap thumb = getThumbnail(params[0].contentResolver, params[0].id);
			if (thumb != null) {
				bitmapCache.put(params[0].id, thumb);
			}
			return thumb;
		}

		@Override
		protected void onPostExecute(Bitmap result) {
			if (result != null) {
				imageView.setImageBitmap(result);
			} else {
				imageView.setImageResource(R.drawable.image_fail);
			}
		}

	}

	class LoadBitmapParams {
		ContentResolver contentResolver;
		long id;
		ImageView imageView;

		public LoadBitmapParams() {

		}

		public LoadBitmapParams(ContentResolver pContentResolver, long pId,
				ImageView pImageView) {
			contentResolver = pContentResolver;
			id = pId;
			imageView = pImageView;
		}
	}
}