public class AccountProvider extends ContentProvider {

    static final int QUERYSUCCESS=0;

    private static final UriMatcher sURIMatcher = new UriMatcher(UriMatcher.NO_MATCH);

    static {

        sURIMatcher.addURI("com.eason.provider","query",0);

    }

/*

    *selectionArg查询参数

    *selection查询条件

    */

    @Override

    public Cursor query(Uri uri,String[] projection,String selection,String[] selectionArgs,String sortOrder) {

        int code=sURIMatcher.match(uri);

        if(code==QUERYSUCCESS){

            SQLiteDatabase db =new MyOpenHelper(getContext()).getReadableDatabase();

            Cursor cursor=db.query("info",projection,selection,selectionArgs,null,null,null);

            return cursor;

        }else throw new IllegalArgumentException("路径有问题啊兄弟");

    }

}

protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        ContentResolver cr=getContentResolver();

        Uri uri=Uri.parse("content://com.eason.provider/query");

        Cursor cursor=cr.query(uri,null,null,null,null);

        if (cursor.getCount()>0&&cursor!=null){

        while(cursor.moveToNext()){

            System.out.println(cursor.getString(1));

            System.out.println(cursor.getString(2));

        }

        }

    }