Android Learning Notes

1.sleep (), Wait (), notify (), Notifyall ( ) sleep () is a static method of the thread class, blocking the thread for a certain amount of time after the thread is in a state that can be scheduled to run, wait (), notify (), Notifyall () is the method used when using an internal object bar lock when a thread needs to satisfy a condition, call wait () to add this thread to the wait set, notify () (disassociate a single thread), Notifyall () (Dismiss all threads) for the blocking state of the waiting set thread.　　 2.android Memory Overflow issues (1) The query database does not have a close cursor (2) When constructing adapter, no cached Convertview (3) Bitmap objects are not used when the object is not called recycle () Free memory (4) does not properly release the object's reference

Android Learning Notes