How to disable UITableView header or footer floating?

@interface XTableView : UITableView {
}
@end

@implementation XTableView


- (BOOL) allowsHeaderViewsToFloat {
	return NO;
}
- (BOOL) allowsFooterViewsToFloat {
	return NO;	
}
@end

How to handle Orientation Changed Notification

- (void)onChangedOrientation:(NSNotification *)notification {
	UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];
	if ((orientation == UIDeviceOrientationLandscapeLeft
|| orientation == UIDeviceOrientationLandscapeRight)) {
		// ex:layoutForLandscape
	}
	else if (orientation == UIDeviceOrientationPortrait) {
		//  ex:layoutForPortrait
	}
}

- (void)viewDidLoad {
    [super viewDidLoad];
	[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(onChangedOrientation:)
								name:UIDeviceOrientationDidChangeNotification
								object:nil];
}

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
	[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
}

- (void)viewWillDisappear:(BOOL)animated {
	[super viewWillDisappear:animated];
	[[NSNotificationCenter defaultCenter] removeObserver:self name:UIDeviceOrientationDidChangeNotification object:nil];

}

// DON'T FORGET ENABLING IT!
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    return YES;
}

How to read a file in the asset folder?

AssetManager mgr = getContext().getAssets();
InputStream in = mgr.open("help.html");

How to set Activity orientation by code

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
or
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

How to prevent LiveView turned to black when it is scrolled?

<ListView android:id="@+id/ResultListView"
android:cacheColorHint="@android:color/white">

How to finish Activity with results

Caller Activity

/* Start Activity */
	public void onClick(View v) {
		Intent intent = new Intent(Intent.ACTION_VIEW);
		intent.setClassName("com.thinoo.ActivityTest", "com.thinoo.ActivityTest.NewActivity");
		startActivityForResult(intent,90);
	}
/* Called when the second activity's finished */
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
         switch(requestCode) {
            	case 90:
            	 if (resultCode == RESULT_OK) {
	            	 Bundle res = data.getExtras();
	            	 String result = res.getString("param_result");
	            	 Log.d("FIRST", "result:"+result);
            	 }
            	break;
         }
    }

---

Callee Activity

    private void finishWithResult()
    {
       Bundle conData = new Bundle();
       conData.putString("results", "Thanks Thanks");
       Intent intent = new Intent();
       intent.putExtras(conData);
       setResult(RESULT_OK, intent);
       finish();
    }

Skeleton codes for Threading on iPhone

- (void) convertThread {
	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
	

	[self performSelectorOnMainThread:(@selector(updateProgressiveView)) withObject:nil waitUntilDone:NO];
    [pool release];
}


- (void) onStart:(id)sender {
	[self performSelectorInBackground:(@selector(convertThread)) withObject:nil];
}

How to get hierarchy index of subview

int viewIndex = [[superView subviews] indexOfObject:targetView];

NSLog wrapper for debug/release mode.

Add preprocessor DEBUG in build option for debug mode.

#ifdef DEBUG
	#define XLog(fmt, ...) NSLog((@"%s (%d) " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__);
#else
	#define XLog(...)
#endif

Usages of XLog is exactly same as NSLog.

How to prevent your application run in background

In your .plist file, add the key named
“Application does not run in background” (UIApplicaionExitsOnSuspend).

Make it YES!