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  • Android中利用ContentResolver获取本地音乐和相册

    在Android中，例如图库和音乐播放器，它们能够扫描我们的系统，获取到本地的相片跟音乐，这一点是如何做到的呢？

    当我们往手机上放图片或者音乐的时候，会在手机内存中某个位置上的某个database中存放图片或者音乐的信息，而我们的应用程序是能够通过ContentResolver去读取到这些数据的。

    下面可以先看一下database在哪，如下：

    然后在data/data/下面呢，有很多provider提供的数据库，而我们的音乐或者图片就是在一个叫做Media的库下：

    external是智能手机中内置的SD卡，而internal则是机身的内存。

    这两个database里面的结构是一样的，我们把external给拉到本地电脑上，如下红色框框显示的，左边就是从手机SD卡拉到电脑，右边是从电脑推到手机SD卡上。

    接下来可以利用SQLiteSpy之类的工具打开我们的数据库，可以看到Images 和 Audio 相关的表和视图：

    比如图片，我们可以查看images这张表，其结构如下：

    音乐，可以查看audio的视图，如下：

    既然知道了这些表的数据结构，那么如何在我们的应用程序中去获取到这些数据呢？答案，当然就是利用ContentResolver了。

    具体看代码，下面我写的一个MusicLoader，是为了获取本地音乐，其中利用了一些过滤条件，只拿出我想要的音乐。

    [java] view plaincopyprint?在CODE上查看代码片派生到我的代码片
     
    1. package com.example.nature;  
    2.   
    3. import java.util.ArrayList;  
    4. import java.util.List;  
    5.   
    6. import android.content.ContentResolver;  
    7. import android.content.ContentUris;  
    8. import android.database.Cursor;  
    9. import android.net.Uri;  
    10. import android.os.Parcel;  
    11. import android.os.Parcelable;  
    12. import android.provider.MediaStore.Audio.Media;  
    13. import android.util.Log;  
    14.   
    15. public class MusicLoader {  
    16.       
    17.     private static final String TAG = "com.example.nature.MusicLoader";  
    18.       
    19.     private static List<MusicInfo> musicList = new ArrayList<MusicInfo>();  
    20.       
    21.     private static MusicLoader musicLoader;  
    22.       
    23.     private static ContentResolver contentResolver;  
    24.     //Uri，指向external的database   
    25.     private Uri contentUri = Media.EXTERNAL_CONTENT_URI;      
    26.     //projection：选择的列; where：过滤条件; sortOrder：排序。  
    27.     private String[] projection = {  
    28.             Media._ID,  
    29.             Media.DISPLAY_NAME,  
    30.             Media.DATA,  
    31.             Media.ALBUM,  
    32.             Media.ARTIST,  
    33.             Media.DURATION,           
    34.             Media.SIZE  
    35.     };  
    36.     private String where =  "mime_type in ('audio/mpeg','audio/x-ms-wma') and bucket_display_name <> 'audio' and is_music > 0 " ;  
    37.     private String sortOrder = Media.DATA;  
    38.       
    39.     public static MusicLoader instance(ContentResolver pContentResolver){  
    40.         if(musicLoader == null){  
    41.             contentResolver = pContentResolver;  
    42.             musicLoader = new MusicLoader();              
    43.         }  
    44.         return musicLoader;  
    45.     }  
    46.       
    47.     private MusicLoader(){                                                                                                             //利用ContentResolver的query函数来查询数据，然后将得到的结果放到MusicInfo对象中，最后放到数组中  
    48.         Cursor cursor = contentResolver.query(contentUri, projection, where, null, sortOrder);  
    49.         if(cursor == null){  
    50.             Log.v(TAG,"Line(37  )   Music Loader cursor == null.");  
    51.         }else if(!cursor.moveToFirst()){  
    52.             Log.v(TAG,"Line(39  )   Music Loader cursor.moveToFirst() returns false.");  
    53.         }else{            
    54.             int displayNameCol = cursor.getColumnIndex(Media.DISPLAY_NAME);  
    55.             int albumCol = cursor.getColumnIndex(Media.ALBUM);  
    56.             int idCol = cursor.getColumnIndex(Media._ID);  
    57.             int durationCol = cursor.getColumnIndex(Media.DURATION);  
    58.             int sizeCol = cursor.getColumnIndex(Media.SIZE);  
    59.             int artistCol = cursor.getColumnIndex(Media.ARTIST);  
    60.             int urlCol = cursor.getColumnIndex(Media.DATA);           
    61.             do{  
    62.                 String title = cursor.getString(displayNameCol);  
    63.                 String album = cursor.getString(albumCol);  
    64.                 long id = cursor.getLong(idCol);                  
    65.                 int duration = cursor.getInt(durationCol);  
    66.                 long size = cursor.getLong(sizeCol);  
    67.                 String artist = cursor.getString(artistCol);  
    68.                 String url = cursor.getString(urlCol);  
    69.                   
    70.                 MusicInfo musicInfo = new MusicInfo(id, title);  
    71.                 musicInfo.setAlbum(album);  
    72.                 musicInfo.setDuration(duration);  
    73.                 musicInfo.setSize(size);  
    74.                 musicInfo.setArtist(artist);  
    75.                 musicInfo.setUrl(url);  
    76.                 musicList.add(musicInfo);  
    77.                   
    78.             }while(cursor.moveToNext());  
    79.         }  
    80.     }  
    81.       
    82.     public List<MusicInfo> getMusicList(){  
    83.         return musicList;  
    84.     }  
    85.       
    86.     public Uri getMusicUriById(long id){  
    87.         Uri uri = ContentUris.withAppendedId(contentUri, id);  
    88.         return uri;  
    89.     }     
    90.         //下面是自定义的一个MusicInfo子类，实现了Parcelable，为的是可以将整个MusicInfo的ArrayList在Activity和Service中传送，=_=!!,但其实不用  
    91.     static class MusicInfo implements Parcelable{                                         
    92.         private long id;  
    93.         private String title;  
    94.         private String album;  
    95.         private int duration;  
    96.         private long size;  
    97.         private String artist;        
    98.         private String url;       
    99.           
    100.         public MusicInfo(){  
    101.               
    102.         }  
    103.           
    104.         public MusicInfo(long pId, String pTitle){  
    105.             id = pId;  
    106.             title = pTitle;  
    107.         }  
    108.           
    109.         public String getArtist() {  
    110.             return artist;  
    111.         }  
    112.   
    113.         public void setArtist(String artist) {  
    114.             this.artist = artist;  
    115.         }  
    116.   
    117.         public long getSize() {  
    118.             return size;  
    119.         }  
    120.   
    121.         public void setSize(long size) {  
    122.             this.size = size;  
    123.         }         
    124.   
    125.         public long getId() {  
    126.             return id;  
    127.         }  
    128.   
    129.         public void setId(long id) {  
    130.             this.id = id;  
    131.         }  
    132.   
    133.         public String getTitle() {  
    134.             return title;  
    135.         }  
    136.   
    137.         public void setTitle(String title) {  
    138.             this.title = title;  
    139.         }  
    140.   
    141.         public String getAlbum() {  
    142.             return album;  
    143.         }  
    144.   
    145.         public void setAlbum(String album) {  
    146.             this.album = album;  
    147.         }  
    148.   
    149.         public int getDuration() {  
    150.             return duration;  
    151.         }  
    152.   
    153.         public void setDuration(int duration) {  
    154.             this.duration = duration;  
    155.         }     
    156.   
    157.         public String getUrl() {  
    158.             return url;  
    159.         }  
    160.   
    161.         public void setUrl(String url) {  
    162.             this.url = url;  
    163.         }  
    164.   
    165.         @Override  
    166.         public int describeContents() {  
    167.             return 0;  
    168.         }  
    169.   
    170.         @Override  
    171.         public void writeToParcel(Parcel dest, int flags) {  
    172.             dest.writeLong(id);  
    173.             dest.writeString(title);  
    174.             dest.writeString(album);  
    175.             dest.writeString(artist);  
    176.             dest.writeString(url);  
    177.             dest.writeInt(duration);  
    178.             dest.writeLong(size);  
    179.         }  
    180.           
    181.         public static final Parcelable.Creator<MusicInfo>   
    182.             CREATOR = new Creator<MusicLoader.MusicInfo>() {  
    183.               
    184.             @Override  
    185.             public MusicInfo[] newArray(int size) {  
    186.                 return new MusicInfo[size];  
    187.             }  
    188.               
    189.             @Override  
    190.             public MusicInfo createFromParcel(Parcel source) {  
    191.                 MusicInfo musicInfo = new MusicInfo();  
    192.                 musicInfo.setId(source.readLong());  
    193.                 musicInfo.setTitle(source.readString());  
    194.                 musicInfo.setAlbum(source.readString());  
    195.                 musicInfo.setArtist(source.readString());  
    196.                 musicInfo.setUrl(source.readString());  
    197.                 musicInfo.setDuration(source.readInt());  
    198.                 musicInfo.setSize(source.readLong());  
    199.                 return musicInfo;  
    200.             }  
    201.         };  
    202.     }  
    203. }  
    [java] view plain copy
     
    print?在CODE上查看代码片派生到我的代码片
    1. package com.example.nature;  
    2.   
    3. import java.util.ArrayList;  
    4. import java.util.List;  
    5.   
    6. import android.content.ContentResolver;  
    7. import android.content.ContentUris;  
    8. import android.database.Cursor;  
    9. import android.net.Uri;  
    10. import android.os.Parcel;  
    11. import android.os.Parcelable;  
    12. import android.provider.MediaStore.Audio.Media;  
    13. import android.util.Log;  
    14.   
    15. public class MusicLoader {  
    16.       
    17.     private static final String TAG = "com.example.nature.MusicLoader";  
    18.       
    19.     private static List<MusicInfo> musicList = new ArrayList<MusicInfo>();  
    20.       
    21.     private static MusicLoader musicLoader;  
    22.       
    23.     private static ContentResolver contentResolver;  
    24.     //Uri，指向external的database  
    25.     private Uri contentUri = Media.EXTERNAL_CONTENT_URI;      
    26.     //projection：选择的列; where：过滤条件; sortOrder：排序。  
    27.     private String[] projection = {  
    28.             Media._ID,  
    29.             Media.DISPLAY_NAME,  
    30.             Media.DATA,  
    31.             Media.ALBUM,  
    32.             Media.ARTIST,  
    33.             Media.DURATION,           
    34.             Media.SIZE  
    35.     };  
    36.     private String where =  "mime_type in ('audio/mpeg','audio/x-ms-wma') and bucket_display_name <> 'audio' and is_music > 0 " ;  
    37.     private String sortOrder = Media.DATA;  
    38.       
    39.     public static MusicLoader instance(ContentResolver pContentResolver){  
    40.         if(musicLoader == null){  
    41.             contentResolver = pContentResolver;  
    42.             musicLoader = new MusicLoader();              
    43.         }  
    44.         return musicLoader;  
    45.     }  
    46.       
    47.     private MusicLoader(){                                                                                                             //利用ContentResolver的query函数来查询数据，然后将得到的结果放到MusicInfo对象中，最后放到数组中  
    48.         Cursor cursor = contentResolver.query(contentUri, projection, where, null, sortOrder);  
    49.         if(cursor == null){  
    50.             Log.v(TAG,"Line(37  )   Music Loader cursor == null.");  
    51.         }else if(!cursor.moveToFirst()){  
    52.             Log.v(TAG,"Line(39  )   Music Loader cursor.moveToFirst() returns false.");  
    53.         }else{            
    54.             int displayNameCol = cursor.getColumnIndex(Media.DISPLAY_NAME);  
    55.             int albumCol = cursor.getColumnIndex(Media.ALBUM);  
    56.             int idCol = cursor.getColumnIndex(Media._ID);  
    57.             int durationCol = cursor.getColumnIndex(Media.DURATION);  
    58.             int sizeCol = cursor.getColumnIndex(Media.SIZE);  
    59.             int artistCol = cursor.getColumnIndex(Media.ARTIST);  
    60.             int urlCol = cursor.getColumnIndex(Media.DATA);           
    61.             do{  
    62.                 String title = cursor.getString(displayNameCol);  
    63.                 String album = cursor.getString(albumCol);  
    64.                 long id = cursor.getLong(idCol);                  
    65.                 int duration = cursor.getInt(durationCol);  
    66.                 long size = cursor.getLong(sizeCol);  
    67.                 String artist = cursor.getString(artistCol);  
    68.                 String url = cursor.getString(urlCol);  
    69.                   
    70.                 MusicInfo musicInfo = new MusicInfo(id, title);  
    71.                 musicInfo.setAlbum(album);  
    72.                 musicInfo.setDuration(duration);  
    73.                 musicInfo.setSize(size);  
    74.                 musicInfo.setArtist(artist);  
    75.                 musicInfo.setUrl(url);  
    76.                 musicList.add(musicInfo);  
    77.                   
    78.             }while(cursor.moveToNext());  
    79.         }  
    80.     }  
    81.       
    82.     public List<MusicInfo> getMusicList(){  
    83.         return musicList;  
    84.     }  
    85.       
    86.     public Uri getMusicUriById(long id){  
    87.         Uri uri = ContentUris.withAppendedId(contentUri, id);  
    88.         return uri;  
    89.     }     
    90.         //下面是自定义的一个MusicInfo子类，实现了Parcelable，为的是可以将整个MusicInfo的ArrayList在Activity和Service中传送，=_=!!,但其实不用  
    91.     static class MusicInfo implements Parcelable{                                         
    92.         private long id;  
    93.         private String title;  
    94.         private String album;  
    95.         private int duration;  
    96.         private long size;  
    97.         private String artist;        
    98.         private String url;       
    99.           
    100.         public MusicInfo(){  
    101.               
    102.         }  
    103.           
    104.         public MusicInfo(long pId, String pTitle){  
    105.             id = pId;  
    106.             title = pTitle;  
    107.         }  
    108.           
    109.         public String getArtist() {  
    110.             return artist;  
    111.         }  
    112.   
    113.         public void setArtist(String artist) {  
    114.             this.artist = artist;  
    115.         }  
    116.   
    117.         public long getSize() {  
    118.             return size;  
    119.         }  
    120.   
    121.         public void setSize(long size) {  
    122.             this.size = size;  
    123.         }         
    124.   
    125.         public long getId() {  
    126.             return id;  
    127.         }  
    128.   
    129.         public void setId(long id) {  
    130.             this.id = id;  
    131.         }  
    132.   
    133.         public String getTitle() {  
    134.             return title;  
    135.         }  
    136.   
    137.         public void setTitle(String title) {  
    138.             this.title = title;  
    139.         }  
    140.   
    141.         public String getAlbum() {  
    142.             return album;  
    143.         }  
    144.   
    145.         public void setAlbum(String album) {  
    146.             this.album = album;  
    147.         }  
    148.   
    149.         public int getDuration() {  
    150.             return duration;  
    151.         }  
    152.   
    153.         public void setDuration(int duration) {  
    154.             this.duration = duration;  
    155.         }     
    156.   
    157.         public String getUrl() {  
    158.             return url;  
    159.         }  
    160.   
    161.         public void setUrl(String url) {  
    162.             this.url = url;  
    163.         }  
    164.   
    165.         @Override  
    166.         public int describeContents() {  
    167.             return 0;  
    168.         }  
    169.   
    170.         @Override  
    171.         public void writeToParcel(Parcel dest, int flags) {  
    172.             dest.writeLong(id);  
    173.             dest.writeString(title);  
    174.             dest.writeString(album);  
    175.             dest.writeString(artist);  
    176.             dest.writeString(url);  
    177.             dest.writeInt(duration);  
    178.             dest.writeLong(size);  
    179.         }  
    180.           
    181.         public static final Parcelable.Creator<MusicInfo>   
    182.             CREATOR = new Creator<MusicLoader.MusicInfo>() {  
    183.               
    184.             @Override  
    185.             public MusicInfo[] newArray(int size) {  
    186.                 return new MusicInfo[size];  
    187.             }  
    188.               
    189.             @Override  
    190.             public MusicInfo createFromParcel(Parcel source) {  
    191.                 MusicInfo musicInfo = new MusicInfo();  
    192.                 musicInfo.setId(source.readLong());  
    193.                 musicInfo.setTitle(source.readString());  
    194.                 musicInfo.setAlbum(source.readString());  
    195.                 musicInfo.setArtist(source.readString());  
    196.                 musicInfo.setUrl(source.readString());  
    197.                 musicInfo.setDuration(source.readInt());  
    198.                 musicInfo.setSize(source.readLong());  
    199.                 return musicInfo;  
    200.             }  
    201.         };  
    202.     }  
    203. }  
    package com.example.nature;

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

import android.content.ContentResolver;
import android.content.ContentUris;
import android.database.Cursor;
import android.net.Uri;
import android.os.Parcel;
import android.os.Parcelable;
import android.provider.MediaStore.Audio.Media;
import android.util.Log;

public class MusicLoader {
	
	private static final String TAG = "com.example.nature.MusicLoader";
	
	private static List<MusicInfo> musicList = new ArrayList<MusicInfo>();
	
	private static MusicLoader musicLoader;
	
	private static ContentResolver contentResolver;
	//Uri，指向external的database
	private Uri contentUri = Media.EXTERNAL_CONTENT_URI;	
	//projection：选择的列; where：过滤条件; sortOrder：排序。
	private String[] projection = {
			Media._ID,
			Media.DISPLAY_NAME,
			Media.DATA,
			Media.ALBUM,
			Media.ARTIST,
			Media.DURATION,			
			Media.SIZE
	};
	private String where =  "mime_type in ('audio/mpeg','audio/x-ms-wma') and bucket_display_name <> 'audio' and is_music > 0 " ;
	private String sortOrder = Media.DATA;
	
	public static MusicLoader instance(ContentResolver pContentResolver){
		if(musicLoader == null){
			contentResolver = pContentResolver;
			musicLoader = new MusicLoader();			
		}
		return musicLoader;
	}
	
	private MusicLoader(){		                                                                                                       //利用ContentResolver的query函数来查询数据，然后将得到的结果放到MusicInfo对象中，最后放到数组中
		Cursor cursor = contentResolver.query(contentUri, projection, where, null, sortOrder);
		if(cursor == null){
			Log.v(TAG,"Line(37	)	Music Loader cursor == null.");
		}else if(!cursor.moveToFirst()){
			Log.v(TAG,"Line(39	)	Music Loader cursor.moveToFirst() returns false.");
		}else{			
			int displayNameCol = cursor.getColumnIndex(Media.DISPLAY_NAME);
			int albumCol = cursor.getColumnIndex(Media.ALBUM);
			int idCol = cursor.getColumnIndex(Media._ID);
			int durationCol = cursor.getColumnIndex(Media.DURATION);
			int sizeCol = cursor.getColumnIndex(Media.SIZE);
			int artistCol = cursor.getColumnIndex(Media.ARTIST);
			int urlCol = cursor.getColumnIndex(Media.DATA);			
			do{
				String title = cursor.getString(displayNameCol);
				String album = cursor.getString(albumCol);
				long id = cursor.getLong(idCol);				
				int duration = cursor.getInt(durationCol);
				long size = cursor.getLong(sizeCol);
				String artist = cursor.getString(artistCol);
				String url = cursor.getString(urlCol);
				
				MusicInfo musicInfo = new MusicInfo(id, title);
				musicInfo.setAlbum(album);
				musicInfo.setDuration(duration);
				musicInfo.setSize(size);
				musicInfo.setArtist(artist);
				musicInfo.setUrl(url);
				musicList.add(musicInfo);
				
			}while(cursor.moveToNext());
		}
	}
	
	public List<MusicInfo> getMusicList(){
		return musicList;
	}
	
	public Uri getMusicUriById(long id){
		Uri uri = ContentUris.withAppendedId(contentUri, id);
		return uri;
	}	
        //下面是自定义的一个MusicInfo子类，实现了Parcelable，为的是可以将整个MusicInfo的ArrayList在Activity和Service中传送，=_=!!,但其实不用
	static class MusicInfo implements Parcelable{										
		private long id;
		private String title;
		private String album;
		private int duration;
		private long size;
		private String artist;		
		private String url;		
		
		public MusicInfo(){
			
		}
		
		public MusicInfo(long pId, String pTitle){
			id = pId;
			title = pTitle;
		}
		
		public String getArtist() {
			return artist;
		}

		public void setArtist(String artist) {
			this.artist = artist;
		}

		public long getSize() {
			return size;
		}

		public void setSize(long size) {
			this.size = size;
		}		

		public long getId() {
			return id;
		}

		public void setId(long id) {
			this.id = id;
		}

		public String getTitle() {
			return title;
		}

		public void setTitle(String title) {
			this.title = title;
		}

		public String getAlbum() {
			return album;
		}

		public void setAlbum(String album) {
			this.album = album;
		}

		public int getDuration() {
			return duration;
		}

		public void setDuration(int duration) {
			this.duration = duration;
		}	

		public String getUrl() {
			return url;
		}

		public void setUrl(String url) {
			this.url = url;
		}

		@Override
		public int describeContents() {
			return 0;
		}

		@Override
		public void writeToParcel(Parcel dest, int flags) {
			dest.writeLong(id);
			dest.writeString(title);
			dest.writeString(album);
			dest.writeString(artist);
			dest.writeString(url);
			dest.writeInt(duration);
			dest.writeLong(size);
		}
		
		public static final Parcelable.Creator<MusicInfo> 
			CREATOR = new Creator<MusicLoader.MusicInfo>() {
			
			@Override
			public MusicInfo[] newArray(int size) {
				return new MusicInfo[size];
			}
			
			@Override
			public MusicInfo createFromParcel(Parcel source) {
				MusicInfo musicInfo = new MusicInfo();
				musicInfo.setId(source.readLong());
				musicInfo.setTitle(source.readString());
				musicInfo.setAlbum(source.readString());
				musicInfo.setArtist(source.readString());
				musicInfo.setUrl(source.readString());
				musicInfo.setDuration(source.readInt());
				musicInfo.setSize(source.readLong());
				return musicInfo;
			}
		};
	}
}

    最后，我们就可以在我们的手机上看到我们音乐了，不过数据库中有些是乱码的，我还不知道怎么解决。。。

    图片的获取也是相类似的，放上代码，具体的自行琢磨：

    [java] view plaincopyprint?在CODE上查看代码片派生到我的代码片
     
    1. package com.example.hmgallery;  
    2.   
    3. import java.util.ArrayList;  
    4. import java.util.List;  
    5.   
    6. import android.content.ContentResolver;  
    7. import android.database.Cursor;  
    8. import android.provider.MediaStore.Images.Media;  
    9. import android.provider.MediaStore.Images.Thumbnails;  
    10. import android.util.SparseArray;  
    11.   
    12. public class Images{  
    13.   
    14.     public static final String IMAGE_PATH = "IMAGE_PATH";  
    15.     public static final String IMAGE_ID = "IMAGE_ID";  
    16.     public static final String IMAGE_POSITION = "IMAGE_POSITION";  
    17.     public static final String IMAGE_COUNTS = "IMAGE_COUNTS";     
    18.       
    19.     private static List<ImageItem> imageItems = new ArrayList<ImageItem>();  
    20.       
    21.     private static SparseArray<ImageItem> tempArray;  
    22.       
    23.     public static void loadImages(ContentResolver contentResolver){  
    24.         tempArray = new SparseArray<ImageItem>();  
    25.         String[] projection = {Media._ID,Media.DATA,Media.ORIENTATION};  
    26.         String where =  Media.BUCKET_DISPLAY_NAME + " = 'Camera'";  
    27.         String sortOrder = Media._ID + " desc";  
    28.         StringBuilder inImageIds = new StringBuilder(Thumbnails.IMAGE_ID);  
    29.         inImageIds.append(" in ( ");  
    30.         Cursor cursor = contentResolver.query(Media.EXTERNAL_CONTENT_URI, projection, where, null, sortOrder);        
    31.         if(cursor.moveToFirst()){  
    32.             do {  
    33.                 int imageId = cursor.getInt(cursor.getColumnIndex(Media._ID));  
    34.                 String imagePath = cursor.getString(cursor.getColumnIndex(Media.DATA));  
    35.                 int orientation = cursor.getInt(cursor.getColumnIndex(Media.ORIENTATION));  
    36.                 ImageItem imageItem = new ImageItem(imageId,imagePath,orientation);               
    37.                 imageItems.add(imageItem);  
    38.                 tempArray.put(imageId, imageItem);  
    39.                 inImageIds.append(imageId).append(",");  
    40.             }while(cursor.moveToNext());  
    41.         }         
    42.           
    43.         inImageIds.deleteCharAt(inImageIds.length() - 1);  
    44.         inImageIds.append(" ) ");   
    45.           
    46.         String[] thumbnailProjection = {Thumbnails.DATA,Thumbnails.IMAGE_ID};  
    47.         cursor = contentResolver.query(Thumbnails.EXTERNAL_CONTENT_URI, thumbnailProjection, inImageIds.toString(), null, null);  
    48.         if(cursor.moveToFirst()){  
    49.             do {                  
    50.                 int imageId = cursor.getInt(cursor.getColumnIndex(Thumbnails.IMAGE_ID));  
    51.                 String thumnbailPath = cursor.getString(cursor.getColumnIndex(Media.DATA));               
    52.                 ImageItem imageItem = tempArray.get(imageId);  
    53.                 if(imageItem != null){  
    54.                     imageItem.setThumbnailPath(thumnbailPath);  
    55.                 }  
    56.             }while(cursor.moveToNext());  
    57.         }         
    58.         tempArray = null;  
    59.     }  
    60.       
    61.     public static ImageItem[] getImageItems(){  
    62.         return imageItems.toArray(new ImageItem[]{});  
    63.     }     
    64. }  
    [java] view plain copy
     
    print?在CODE上查看代码片派生到我的代码片
    1. package com.example.hmgallery;  
    2.   
    3. import java.util.ArrayList;  
    4. import java.util.List;  
    5.   
    6. import android.content.ContentResolver;  
    7. import android.database.Cursor;  
    8. import android.provider.MediaStore.Images.Media;  
    9. import android.provider.MediaStore.Images.Thumbnails;  
    10. import android.util.SparseArray;  
    11.   
    12. public class Images{  
    13.   
    14.     public static final String IMAGE_PATH = "IMAGE_PATH";  
    15.     public static final String IMAGE_ID = "IMAGE_ID";  
    16.     public static final String IMAGE_POSITION = "IMAGE_POSITION";  
    17.     public static final String IMAGE_COUNTS = "IMAGE_COUNTS";     
    18.       
    19.     private static List<ImageItem> imageItems = new ArrayList<ImageItem>();  
    20.       
    21.     private static SparseArray<ImageItem> tempArray;  
    22.       
    23.     public static void loadImages(ContentResolver contentResolver){  
    24.         tempArray = new SparseArray<ImageItem>();  
    25.         String[] projection = {Media._ID,Media.DATA,Media.ORIENTATION};  
    26.         String where =  Media.BUCKET_DISPLAY_NAME + " = 'Camera'";  
    27.         String sortOrder = Media._ID + " desc";  
    28.         StringBuilder inImageIds = new StringBuilder(Thumbnails.IMAGE_ID);  
    29.         inImageIds.append(" in ( ");  
    30.         Cursor cursor = contentResolver.query(Media.EXTERNAL_CONTENT_URI, projection, where, null, sortOrder);        
    31.         if(cursor.moveToFirst()){  
    32.             do {  
    33.                 int imageId = cursor.getInt(cursor.getColumnIndex(Media._ID));  
    34.                 String imagePath = cursor.getString(cursor.getColumnIndex(Media.DATA));  
    35.                 int orientation = cursor.getInt(cursor.getColumnIndex(Media.ORIENTATION));  
    36.                 ImageItem imageItem = new ImageItem(imageId,imagePath,orientation);               
    37.                 imageItems.add(imageItem);  
    38.                 tempArray.put(imageId, imageItem);  
    39.                 inImageIds.append(imageId).append(",");  
    40.             }while(cursor.moveToNext());  
    41.         }         
    42.           
    43.         inImageIds.deleteCharAt(inImageIds.length() - 1);  
    44.         inImageIds.append(" ) ");   
    45.           
    46.         String[] thumbnailProjection = {Thumbnails.DATA,Thumbnails.IMAGE_ID};  
    47.         cursor = contentResolver.query(Thumbnails.EXTERNAL_CONTENT_URI, thumbnailProjection, inImageIds.toString(), null, null);  
    48.         if(cursor.moveToFirst()){  
    49.             do {                  
    50.                 int imageId = cursor.getInt(cursor.getColumnIndex(Thumbnails.IMAGE_ID));  
    51.                 String thumnbailPath = cursor.getString(cursor.getColumnIndex(Media.DATA));               
    52.                 ImageItem imageItem = tempArray.get(imageId);  
    53.                 if(imageItem != null){  
    54.                     imageItem.setThumbnailPath(thumnbailPath);  
    55.                 }  
    56.             }while(cursor.moveToNext());  
    57.         }         
    58.         tempArray = null;  
    59.     }  
    60.       
    61.     public static ImageItem[] getImageItems(){  
    62.         return imageItems.toArray(new ImageItem[]{});  
    63.     }     
    64. }  
    package com.example.hmgallery;

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

import android.content.ContentResolver;
import android.database.Cursor;
import android.provider.MediaStore.Images.Media;
import android.provider.MediaStore.Images.Thumbnails;
import android.util.SparseArray;

public class Images{

	public static final String IMAGE_PATH = "IMAGE_PATH";
	public static final String IMAGE_ID = "IMAGE_ID";
	public static final String IMAGE_POSITION = "IMAGE_POSITION";
	public static final String IMAGE_COUNTS = "IMAGE_COUNTS";	
	
	private static List<ImageItem> imageItems = new ArrayList<ImageItem>();
	
	private static SparseArray<ImageItem> tempArray;
	
	public static void loadImages(ContentResolver contentResolver){
		tempArray = new SparseArray<ImageItem>();
		String[] projection = {Media._ID,Media.DATA,Media.ORIENTATION};
		String where =  Media.BUCKET_DISPLAY_NAME + " = 'Camera'";
		String sortOrder = Media._ID + " desc";
		StringBuilder inImageIds = new StringBuilder(Thumbnails.IMAGE_ID);
		inImageIds.append(" in ( ");
		Cursor cursor = contentResolver.query(Media.EXTERNAL_CONTENT_URI, projection, where, null, sortOrder);		
		if(cursor.moveToFirst()){
			do {
				int imageId = cursor.getInt(cursor.getColumnIndex(Media._ID));
				String imagePath = cursor.getString(cursor.getColumnIndex(Media.DATA));
				int orientation = cursor.getInt(cursor.getColumnIndex(Media.ORIENTATION));
				ImageItem imageItem = new ImageItem(imageId,imagePath,orientation);				
				imageItems.add(imageItem);
				tempArray.put(imageId, imageItem);
				inImageIds.append(imageId).append(",");
			}while(cursor.moveToNext());
		}		
		
		inImageIds.deleteCharAt(inImageIds.length() - 1);
		inImageIds.append(" ) "); 
		
		String[] thumbnailProjection = {Thumbnails.DATA,Thumbnails.IMAGE_ID};
		cursor = contentResolver.query(Thumbnails.EXTERNAL_CONTENT_URI, thumbnailProjection, inImageIds.toString(), null, null);
		if(cursor.moveToFirst()){
			do {				
				int imageId = cursor.getInt(cursor.getColumnIndex(Thumbnails.IMAGE_ID));
				String thumnbailPath = cursor.getString(cursor.getColumnIndex(Media.DATA));				
				ImageItem imageItem = tempArray.get(imageId);
				if(imageItem != null){
					imageItem.setThumbnailPath(thumnbailPath);
				}
			}while(cursor.moveToNext());
		}		
		tempArray = null;
	}
	
	public static ImageItem[] getImageItems(){
		return imageItems.toArray(new ImageItem[]{});
	}	
}



     
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  • 原文地址：https://www.cnblogs.com/Dionexin/p/5853039.html
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