Component Content Provider creation and registration, contentprovider

Component Content Provider creation and registration, contentprovider

1. Create a provider

public class DemoProvider extends ContentProvider {    public static final int DEMO_DIR=0;    public static final int DEMO_ITEM=1;    public static final String AUTHORITIES="com.demo.provider";    private static UriMatcher sUriMatcher;    private DemoHelper mDemoHelper;    static {        sUriMatcher=new UriMatcher(UriMatcher.NO_MATCH);        sUriMatcher.addURI(AUTHORITIES,"xx",DEMO_DIR);        sUriMatcher.addURI(AUTHORITIES,"xx/#",DEMO_ITEM);    }    @Override    public int delete(Uri uri, String selection, String[] selectionArgs) {        SQLiteDatabase db=mDemoHelper.getWritableDatabase();        int deletedRows=0;        switch (sUriMatcher.match(uri)){            case DEMO_DIR:                deletedRows=db.delete("name",selection,selectionArgs);                break;            case DEMO_ITEM:                String id=uri.getPathSegments().get(1);                deletedRows=db.delete("name","id=?",new String[]{id});                break;        }        return deletedRows;    }    @Override    public String getType(Uri uri) {       switch (sUriMatcher.match(uri)){           case DEMO_DIR:              return "vnd.android.cursor.dir/vnd.com.demo.provider.name";           case DEMO_ITEM:               String id=uri.getPathSegments().get(1);              return "vnd.android.cursor.item/vnd.com.demo.provider.name";       }       return null;    }    @Override    public Uri insert(Uri uri, ContentValues values) {        SQLiteDatabase db=mDemoHelper.getWritableDatabase();        Uri returnUri=null;        switch (sUriMatcher.match(uri)){            case DEMO_DIR:            case DEMO_ITEM:               long newId=db.insert("tablename",null,values);                returnUri=Uri.parse("content://"+AUTHORITIES+"/tablename/"+newId);                break;        }        return returnUri;    }    @Override    public boolean onCreate() {        mDemoHelper=new DemoHelper(getContext(),"xxxx.db",null,1);        return true;    }    @Override    public Cursor query(Uri uri, String[] projection, String selection,String[] selectionArgs, String sortOrder)    {        SQLiteDatabase db=mDemoHelper.getWritableDatabase();        Cursor cursor=null;        switch (sUriMatcher.match(uri)){            case DEMO_DIR:                cursor=db.query("tablename",projection,selection,selectionArgs,null,null,sortOrder);                break;            case DEMO_ITEM:                String id=uri.getPathSegments().get(1);                cursor=db.query("tablename",projection,"id=?",new String[]{id},null,null,sortOrder);                break;        }        return cursor;    }    @Override    public int update(Uri uri, ContentValues values, String selection,                      String[] selectionArgs) {        SQLiteDatabase db=mDemoHelper.getWritableDatabase();      int updateRows=0;        switch (sUriMatcher.match(uri)){            case DEMO_DIR:                updateRows=db.update("name",values,selection,selectionArgs);                break;            case DEMO_ITEM:                String id=uri.getPathSegments().get(1);                updateRows=db.update("name",values,"id=?",new String[]{id});                break;        }        return updateRows;    }}

2. Register provider

<provider android:name=".DemoProvider" android:authorities="com.demo.provider" android:enabled="true" android:exported="true">       </provider>