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摘要： public class GestureTestActivity extends Activity implements OnGestureListener // 1. 实现手势监听器 { GestureDetector detector; //定义手势检测器实例 @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setCont... 阅读全文

摘要： 继承 SQLiteOpenHelper 类public class MyDatabaseHelper extends SQLiteOpenHelper { final String createTable = "create table mtb(" + "id integer primary key autoincrement," + "name varchar(20)," + "password varchar(20)" + ")"; final String[] in... 阅读全文

摘要： public void testSimpleCursorAdapter(){ //如果这样写： Cursor cursor = db.rawQuery("select id,name,password from mtb", null); //LogCat报错: java.lang.IllegalArgumentException: column '_id' does not exist /* 构造 Cursor 的时候需要 这个 '_id' . 所以查询返回的结果集必须有这个列名 。 ... 阅读全文