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 = Intent();// 得到⽤于激活它的意图
position = IntExtra("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 + "')";
//更新
sql = "update task set istop = 'true' where taskid = "
+ selectedtaskid + "";
//删除
安卓开发实例入门
db.delete( "task","taskid = ?",  new String[] { String.valueOf(selectedtaskid) });

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