ContentProvider与ContentResolver使用

  1 public class PersonContentProvider extends ContentProvider{  
  2     private DataBaseOpenHelper dataBaseOpenHelper;  
  3     private static final int ALLPERSON=1;  
  4     private static final int PERSON=2;  
  5     private static final UriMatcher uriMatcher=new UriMatcher(UriMatcher.NO_MATCH);  
  6     static{  
  7         uriMatcher.addURI("com.gao.provider.personprovider", "person", ALLPERSON);  
  8         uriMatcher.addURI("com.gao.provider.personprovider", "person/#", PERSON);  
  9           
 10     }  
 11     @Override  
 12     public int delete(Uri uri, String selection, String[] selectionArgs) {  
 13         SQLiteDatabase database=dataBaseOpenHelper.getWritableDatabase();  
 14         int count=0;  
 15         switch (uriMatcher.match(uri)) {  
 16         case ALLPERSON://content://com.gao.provider.personprovider/person  
 17             count=database.delete("person", selection, selectionArgs);  
 18             break;  
 19         case PERSON://content://com.gao.provider.personprovider/person/100  
 20             long id=ContentUris.parseId(uri);  
 21             String where=TextUtils.isEmpty(selection)?"personid=?":selection+"and personid=?";  
 22             String[] params=new String[]{String.valueOf(id)};  
 23             if (!TextUtils.isEmpty(selection)&&selectionArgs!=null) {  
 24                 params=new String[selectionArgs.length+1];  
 25                 for (int i = 0; i < selectionArgs.length; i++) {  
 26                     params[i]=selectionArgs[i];  
 27                 }  
 28                 params[selectionArgs.length+1]=String.valueOf(id);  
 29             }  
 30             count=database.delete("person", where, selectionArgs);  
 31             break;  
 32         default:  
 33             throw new IllegalArgumentException("Unkonw uri:"+uri);  
 34         }  
 35         return count;  
 36     }  
 37     @Override  
 38     public String getType(Uri uri) {  
 39         switch (uriMatcher.match(uri)) {  
 40         case ALLPERSON:  
 41             return "vnd.android.cursor.dir/personprovider.person";  
 42         case PERSON:  
 43             return "vnd.android.cursor.item/personprovider.person";  
 44         default:  
 45             break;  
 46         }  
 47         return null;  
 48     }  
 49     @Override  
 50     public Uri insert(Uri uri, ContentValues values) {  
 51         SQLiteDatabase database=dataBaseOpenHelper.getWritableDatabase();  
 52         long id=0;  
 53         switch (uriMatcher.match(uri)) {  
 54         case ALLPERSON://content://com.gao.provider.personprovider/person  
 55             id=database.insert("person", "name", values);//返回记录的行号，主键是int，实际上就是主键值  
 56             return ContentUris.withAppendedId(uri, id);  
 57         case PERSON://content://com.gao.provider.personprovider/person/100  
 58             id=database.insert("person", "name", values);  
 59             String path=uri.toString();  
 60             return Uri.parse(path.substring(0, path.lastIndexOf("/"))+"id");  
 61         default:  
 62             throw new IllegalArgumentException("Unkonw uri:"+uri);  
 63         }  
 64     }  
 65     @Override  
 66     public boolean onCreate() {  
 67         dataBaseOpenHelper=new DataBaseOpenHelper(this.getContext());  
 68         return false;  
 69     }  
 70     @Override  
 71     public Cursor query(Uri uri, String[] projection, String selection,  
 72             String[] selectionArgs, String sortOrder) {  
 73         SQLiteDatabase database=dataBaseOpenHelper.getReadableDatabase();  
 74         switch (uriMatcher.match(uri)) {  
 75         case ALLPERSON:  
 76             database.query("person", projection, selection, selectionArgs, null, null, sortOrder);  
 77             break;  
 78         case PERSON:  
 79             long id=ContentUris.parseId(uri);  
 80             String where=TextUtils.isEmpty(selection)?"personid=?":selection+"and personid=?";  
 81             String[] params=new String[]{String.valueOf(id)};  
 82             if (!TextUtils.isEmpty(selection)&&selectionArgs!=null) {  
 83                 params=new String[selectionArgs.length+1];  
 84                 for (int i = 0; i < selectionArgs.length; i++) {  
 85                     params[i]=selectionArgs[i];  
 86                 }  
 87                 params[selectionArgs.length+1]=String.valueOf(id);  
 88             }  
 89             database.query("person", projection, where, params, null, null, sortOrder);  
 90             break;  
 91         default:  
 92             break;  
 93         }  
 94         return null;  
 95     }  
 96     //update("content://com.gao.provider.personprovider/person/100",values,"name like ? and ...",new String[]{"%gao%"});  
 97     @Override  
 98     public int update(Uri uri, ContentValues values, String selection,  
 99             String[] selectionArgs) {  
100         SQLiteDatabase database=dataBaseOpenHelper.getWritableDatabase();  
101         int count=0;  
102         switch (uriMatcher.match(uri)) {  
103         case ALLPERSON://content://com.gao.provider.personprovider/person  
104             count=database.update("person", values, selection,selectionArgs);  
105             break;  
106         case PERSON://content://com.gao.provider.personprovider/person/100  
107             long id=ContentUris.parseId(uri);  
108             String where=TextUtils.isEmpty(selection)?"personid=?":selection+"and personid=?";  
109             String[] params=new String[]{String.valueOf(id)};  
110             if (!TextUtils.isEmpty(selection)&&selectionArgs!=null) {  
111                 params=new String[selectionArgs.length+1];  
112                 for (int i = 0; i < selectionArgs.length; i++) {  
113                     params[i]=selectionArgs[i];  
114                 }  
115                 params[selectionArgs.length+1]=String.valueOf(id);  
116             }  
117             count=database.update("person", values, where,params);  
118             break;  
119         default:  
120             throw new IllegalArgumentException("Unkonw uri:"+uri);  
121         }  
122         return count;  
123     }  
124 }  
125