Android two common errors (ANR and FC) solutions

ANR (Activity not Respone) (no response)

Introduce the next main thread (also known as the UI thread, the main threaded)

Features: 1. Creating UI Controls

2. Updating UI control state

3. Event handling

Limitation: The main thread does not recommend events that have more than 5 seconds

Conditions to appear:

The ANR dialog box pops up when the user input event 5s does not get a response

Broadcast recipient's onreceive () execution time exceeds 10s

Solution (Principle):

All possible time-consuming operations are performed in the child thread ()

Common time-consuming operations:

I/O: network operation

SDcard

Data operations

FC (Force Close)

Reason:

1.Error

OOM (out of memory error)

Stackoverflowerror

2.RuntimeException

Workaround:

Look at the log

The child thread cannot update the UI's workaround:

1. Send the result of the child thread execution to the main thread: Handler+massage Inter-thread communication

Send message:

Messagemsg = Mhandler. Obtainmessage (UPLOAD, JSON);    

Mhandler . SendMessage (msg);

Receive Message :

Public void handlemessage (Message msg) {

Switch (msg. What) {

Case UPLOAD:

mTextView2. SetText (String) msg. obj);

break;

Case DOWNLOAD:

Mtextview. SetText (String) msg. obj);

break;

default:

break;

}

}

2. Make the update UI code snippet execute on the main thread:

1.runonuithread

2.view.post view.postdelay ()

3.handler.post handler. Postdelay ()

Reference:

Http://www.cnblogs.com/mengdd/p/3418780.html

Android two common errors (ANR and FC) solutions