Android本地視頻播放器開發--搜索本地視頻（2）

1、首先介紹布局代碼，主布局代碼只含有一個LIstView  --jie_video.xml

[html]
<?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> 

<?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、下一個布局就是listView的子項的布局

[html]
<?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> 

<?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、布局都寫好了，然後就是Activity的編寫，這裡涉及到視頻的縮略圖的顯示，所以要用到異步加載功能

JieVideo.java

[java]
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; 
    } 
    /** 
        * 獲取視頻縮略圖 
        * @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); 
        } 
    } 
} 

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;
 }
 /**
     * 獲取視頻縮略圖
     * @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、上面還涉及一個就是LIstView的適配器，這裡是繼承BaseAdapter。

JieVideoListViewAdapter.java

[java]
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; 
    } 
} 

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、還有一個在JieVideo類中使用了一個LoadedImage的類，它的代碼如下：

[java]
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; 
    } 
} 

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;
 }
}

那就看看最終的實現效果吧：