Android本地视频播放器开发--搜索本地视频（2）

ゞ浴缸里的玫瑰 2022-08-14 01:45 140阅读 0赞

在Android本地视频播放器开发--搜索本地视频（1）中我们获取了本地视频的数据，在这一章里面，我们将获取的数据通过LIstView来动态的实现出来。  
1、首先介绍布局代码，主布局代码只含有一个LIstView  --jie\_video.xml  
\[html\] view plaincopy  
<?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" >    
    <ListView    
        android:layout\_width="match\_parent"    
        android:layout\_height="match\_parent"    
        android:layout\_alignParentBottom="true"    
        android:id="@+id/jievideolistfile"    
    />    
</RelativeLayout>    
2、下一个布局就是listView的子项的布局  
\[html\] view plaincopy  
<?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" >    
    <ImageView     
        android:layout\_width="120dp"    
        android:layout\_height="80dp"    
        android:id="@+id/video\_img"    
        android:contentDescription="@string/cont"    
        />    
    <RelativeLayout     
        android:layout\_width="match\_parent"    
        android:layout\_height="match\_parent"    
        android:layout\_toRightOf="@id/video\_img"    
        android:layout\_alignBottom="@id/video\_img"    
        >    
        <TextView     
            android:layout\_width="match\_parent"    
            android:layout\_height="wrap\_content"    
            android:id="@+id/video\_title"    
            android:gravity="center"    
            android:layout\_marginTop="5dp"    
            android:text="@string/title"    
        />    
            
        <TextView     
            android:layout\_width="match\_parent"    
            android:layout\_height="wrap\_content"    
            android:id="@+id/video\_time"    
            android:gravity="center"    
            android:layout\_alignParentBottom="true"    
            android:layout\_marginBottom="5dp"    
            android:text="@string/time"    
        />    
    </RelativeLayout>    
</RelativeLayout>    
  
  
3、布局都写好了，然后就是Activity的编写，这里涉及到视频的缩略图的显示，所以要用到异步加载功能  
JieVideo.java  
\[java\] view plaincopy  
package com.zhangjie.graduation.videopalyer;    
    
import java.util.List;    
    
import com.zhangjie.graduation.videopalyer.component.JieVideoListViewAdapter;    
import com.zhangjie.graduation.videopalyer.component.LoadedImage;    
import com.zhangjie.graduation.videopalyer.videofile.AbstructProvider;    
import com.zhangjie.graduation.videopalyer.videofile.Video;    
import com.zhangjie.graduation.videopalyer.videofile.VideoProvider;    
    
import android.app.Activity;    
import android.content.Intent;    
import android.graphics.Bitmap;    
import android.graphics.drawable.BitmapDrawable;    
import android.media.ThumbnailUtils;    
import android.os.AsyncTask;    
import android.os.Bundle;    
import android.provider.MediaStore.Video.Thumbnails;    
import android.view.View;    
import android.widget.AdapterView;    
import android.widget.ImageView;    
import android.widget.ListView;    
import android.widget.AdapterView.OnItemClickListener;    
    
public class JieVideo extends Activity\{    
    
    public JieVideo instance = null;    
    ListView mJieVideoListView;    
    JieVideoListViewAdapter mJieVideoListViewAdapter;    
    List<Video> listVideos;    
    int videoSize;    
    @Override    
    protected void onCreate(Bundle savedInstanceState) \{    
        super.onCreate(savedInstanceState);    
        setContentView(R.layout.jie\_video);    
        instance = this;    
        AbstructProvider provider = new VideoProvider(instance);    
        listVideos = provider.getList();    
        videoSize = listVideos.size();    
        mJieVideoListViewAdapter = new JieVideoListViewAdapter(this, listVideos);    
        mJieVideoListView = (ListView)findViewById(R.id.jievideolistfile);    
        mJieVideoListView.setAdapter(mJieVideoListViewAdapter);    
        mJieVideoListView.setOnItemClickListener(new OnItemClickListener() \{    
            @Override    
            public void onItemClick(AdapterView<?> parent, View view, int position,    
                    long id) \{    
                Intent intent = new Intent();    
                intent.setClass(JieVideo.this, JieVideoPlayer.class);    
                Bundle bundle = new Bundle();    
                bundle.putSerializable("video", listVideos.get(position));    
                intent.putExtras(bundle);    
                startActivity(intent);    
            \}    
        \});    
        loadImages();    
    \}    
    /\*\*   
     \* Load images.   
     \*/    
    private void loadImages() \{    
        final Object data = getLastNonConfigurationInstance();    
        if (data == null) \{    
            new LoadImagesFromSDCard().execute();    
        \} else \{    
            final LoadedImage\[\] photos = (LoadedImage\[\]) data;    
            if (photos.length == 0) \{    
                new LoadImagesFromSDCard().execute();    
            \}    
            for (LoadedImage photo : photos) \{    
                addImage(photo);    
            \}    
        \}    
    \}    
    private void addImage(LoadedImage... value) \{    
        for (LoadedImage image : value) \{    
            mJieVideoListViewAdapter.addPhoto(image);    
            mJieVideoListViewAdapter.notifyDataSetChanged();    
        \}    
    \}    
    @Override    
    public Object onRetainNonConfigurationInstance() \{    
        final ListView grid = mJieVideoListView;    
        final int count = grid.getChildCount();    
        final LoadedImage\[\] list = new LoadedImage\[count\];    
    
        for (int i = 0; i < count; i++) \{    
            final ImageView v = (ImageView) grid.getChildAt(i);    
            list\[i\] = new LoadedImage(    
                    ((BitmapDrawable) v.getDrawable()).getBitmap());    
        \}    
    
        return list;    
    \}    
    /\*\*    
        \* 获取视频缩略图    
        \* @param videoPath    
        \* @param width    
        \* @param height    
        \* @param kind    
        \* @return    
        \*/      
       private Bitmap getVideoThumbnail(String videoPath, int width , int height, int kind)\{      
        Bitmap bitmap = null;      
        bitmap = ThumbnailUtils.createVideoThumbnail(videoPath, kind);      
        bitmap = ThumbnailUtils.extractThumbnail(bitmap, width, height, ThumbnailUtils.OPTIONS\_RECYCLE\_INPUT);      
        return bitmap;      
       \}      
    
    class LoadImagesFromSDCard extends AsyncTask<Object, LoadedImage, Object> \{    
        @Override    
        protected Object doInBackground(Object... params) \{    
            Bitmap bitmap = null;    
            for (int i = 0; i < videoSize; i++) \{    
                bitmap = getVideoThumbnail(listVideos.get(i).getPath(), 120, 120, Thumbnails.MINI\_KIND);    
                if (bitmap != null) \{    
                    publishProgress(new LoadedImage(bitmap));    
                \}    
            \}    
            return null;    
        \}    
            
        @Override    
        public void onProgressUpdate(LoadedImage... value) \{    
            addImage(value);    
        \}    
    \}    
\}    
4、上面还涉及一个就是LIstView的适配器，这里是继承BaseAdapter。  
JieVideoListViewAdapter.java  
\[java\] view plaincopy  
package com.zhangjie.graduation.videopalyer.component;    
    
import java.util.ArrayList;    
import java.util.List;    
    
import com.zhangjie.graduation.videopalyer.R;    
import com.zhangjie.graduation.videopalyer.videofile.Video;    
    
import android.content.Context;    
import android.view.LayoutInflater;    
import android.view.View;    
import android.view.ViewGroup;    
import android.widget.BaseAdapter;    
import android.widget.ImageView;    
import android.widget.TextView;    
    
public class JieVideoListViewAdapter extends BaseAdapter\{    
    
    List<Video> listVideos;    
    int local\_postion = 0;    
    boolean imageChage = false;    
    private LayoutInflater mLayoutInflater;    
    private ArrayList<LoadedImage> photos = new ArrayList<LoadedImage>();    
    public JieVideoListViewAdapter(Context context, List<Video> listVideos)\{    
        mLayoutInflater = LayoutInflater.from(context);    
        this.listVideos = listVideos;    
    \}    
    @Override    
    public int getCount() \{    
        return photos.size();    
    \}    
    public void addPhoto(LoadedImage image)\{    
        photos.add(image);    
    \}    
    @Override    
    public Object getItem(int position) \{    
        return position;    
    \}    
        
    @Override    
    public long getItemId(int position) \{    
        return position;    
    \}    
    
    @Override    
    public View getView(int position, View convertView, ViewGroup parent) \{    
        ViewHolder holder = null;    
        if (convertView == null) \{    
            holder = new ViewHolder();    
            convertView = mLayoutInflater.inflate(R.layout.video\_list\_view, null);    
            holder.img = (ImageView)convertView.findViewById(R.id.video\_img);    
            holder.title = (TextView)convertView.findViewById(R.id.video\_title);    
            holder.time = (TextView)convertView.findViewById(R.id.video\_time);    
            convertView.setTag(holder);    
        \}else \{    
            holder = (ViewHolder)convertView.getTag();    
        \}    
            holder.title.setText(listVideos.get(position).getTitle());//ms    
            long min = listVideos.get(position).getDuration() /1000 / 60;    
            long sec = listVideos.get(position).getDuration() /1000 % 60;    
            holder.time.setText(min+" : "+sec);    
            holder.img.setImageBitmap(photos.get(position).getBitmap());    
            
        return convertView;    
    \}    
    
    public final class ViewHolder\{    
        public ImageView img;    
        public TextView title;    
        public TextView time;    
    \}    
\}    
  
  
5、还有一个在JieVideo类中使用了一个LoadedImage的类，它的代码如下：  
\[java\] view plaincopy  
package com.zhangjie.graduation.videopalyer.component;    
    
import android.graphics.Bitmap;    
    
    public class LoadedImage \{    
        Bitmap mBitmap;    
    
    public LoadedImage(Bitmap bitmap) \{    
        mBitmap = bitmap;    
    \}    
    
    public Bitmap getBitmap() \{    
        return mBitmap;    
    \}    
\}