2013.3.26 PendingIntent，sqlite数据库

1,PendingIntent,当满足某些条件时要执行某个动作，动作包括激活一个Activity，broadcast，Service，具体动作和数据在Intent中，PendingIntent已知用在通知，短信发送，Alarm中，PendingIntent保存当前应用的context，即使当前应用被killed掉，其他应用也有权限和能力执行操作。

 If the creating application later re-retrieves the same kind of PendingIntent (same operation, same Intent action, data, categories, and components, and same flags), it will receive a PendingIntent representing the same token if that is still valid, and can thus call cancel() to remove it.

唯一确定一个PendingIntent：same operation, same Intent action, data, categories, and components, and same flags

2,

通过context的openfileoutput() 
创建的文件:
data/data/<包名>/files/config.txt 

存放手机rom内存里面的.

//写文件

FileOutputStream fos = context.openFileOutput("config.txt", MODE_APPEND);
String s = "abner:clever/123";
fos.write(s.getBytes());
fos.flush();
fos.close();

//读文件

File file = new File("/data/data/cn.itcast.datasave/files/config.txt");


FileInputStream fis = new FileInputStream(file);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len;
while((len = fis.read(buffer))!=-1){
bos.write(buffer, 0, len);
}
byte[] result = bos.toByteArray();
String content = new String(result);

3，shell下查看数据库

adb shell
cd data/data/packagename/datebases/
sqlite3 dbname