安卓应用开发常用代码
1,获取当天日期
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); String updatedate = sdf.format(new java.util.Date());
2,String转Int
Integer.valueOf(str).intValue()
3,Int转String
String.valueOf(selectedtaskid)
4,Toast显示
Toast.makeText(ListComplicateTaskActivity.this, "你已经有100条记录,请先删除一些", Toast.LENGTH_LONG).show();
5,不带参数跳转activity
startActivity(new Intent(ListComplicateTaskActivity.this,ListComplicateTaskActivity.class));
6,带参数跳转activity
A: Intent it = new Intent(); it.putExtra("selectpos", 65535); it.setClass(ListComplicateTaskActivity.this,AddTaskActivity.class); startActivity(it); B: Intent intent = this.getIntent();// 得到用于激活它的意图 position = intent.getIntExtra("selectpos", 0);
7,SQLite数据库操作
//查询 Cursor c = db.rawQuery("select * from task where taskid = ?", new String[] { position + "" });
//插入
sql = "insert into task(taskid,content,priority,istop,isdeadline,deadline, updatedate) values ("
+ taskno
+ ", ‘"
+ stredit
+ "‘, "
+ radioidx
+ ", ‘"
+ isontop
+ "‘, ‘"
+ isdealine
+ "‘, ‘"
+ time + "‘, ‘" + updatedate + "‘)";
db.execSQL(sql);
//更新
sql = "update task set istop = ‘true‘ where taskid = "
+ selectedtaskid + "";
db.execSQL(sql);// 执行修改
//删除
db.delete( "task","taskid = ?", new String[] { String.valueOf(selectedtaskid) });
郑重声明:本站内容如果来自互联网及其他传播媒体,其版权均属原媒体及文章作者所有。转载目的在于传递更多信息及用于网络分享,并不代表本站赞同其观点和对其真实性负责,也不构成任何其他建议。