how to stop android from lagging

From the start of the Android program, I was told that the common sense 1. Length width of the value to use the DP as a unit into the Dimens.xml file 2. The value of the font size to use the SP as a unit, also into the Dimens.xml file Then, there is no then, as if the subtext is that, you remember to use on the line. One day, when we accidentally put the font into a DP, it can work, and the effect of th

About android's Unit (dp, sp) and androiddp Android is a headache. ---------Android has the following units: Common dip and sp, sometimes using px. ---------Two classes are introduced: TypedValue: There are some methods related to unit conversion. DisplayMetrics: DisplayMetrics dm = new DisplayMetrics();getWindowMan

When writing code in Android native, it is often exposed to sp and wp. sp does not mean smart pointer, but strong point; wp is weak pointer. These two concepts are similar to the strong and weak references in JAVA. Using sp and wp can eliminate the need for programmers to release memory and prevent memory leakage. Let'

1 "DP is a unit that is independent of pixel density, that is, in the same size, but different resolution of the phone, the thing with the DP logo, the size of the display is the same.The SP is used to identify the font, not only with respect to the screen size, but also with the system font size set.[HTML]View Plaincopy TextView android:id="@+id/tv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="

= density_device/(float) density_default;Xdpi = density_device; --------------------------Density_default = density_medium = 160; ========================================================== ====Therefore, if PT and SP take the same value of 1, the coefficient between 1pt and 1sp can be set to X, 1 * density_device/72 = x * 1 * density_device/160 = gt;X = 160/72 = 2.2222 That is to say, in Android, 1pt is r

After reading the code at the Android Framework, I can find that the ubiquitous SP has a visual impact on me. What is this? At the beginning, I think this is basically used as a pointer, and I don't know its internal beauty. So I will learn and sum up the charm of the SP class here. 1 SP this product is a template clas

best to use SP as the unit for textview font size and viewTextviewAndroid uses SP as the font size unit by default. ######################################## ###########################\ Conversion (using SP and Pt as an example)View the source code of textview and other classes. We can see that: Case complex_unit_px:Return value;Case complex_unit_sp:Return Value

Shows the difference between units px and dip and SPDip:device independent pixels (device independent pixels). Different devices have different display effects, this is related to the device hardware, generally we support WVGA, HVGA and QVGA recommend this, do not rely on pixels.Px:pixels (pixels). Different devices show the same effect, generally we hvga represent 320x480 pixels, this use more.Pt:point, is a standard length unit, 1pt=1/72 inches, for the printing industry, very simple to use;sp

Dip:device independent pixels (device independent pixel). Different devices have different display effects, this is related to the device hardware, we generally support the WVGA, HVGA and QVGA recommended to use this, do not rely on pixels.px:pixels (pixel). Different devices display the same effect, generally we hvga represent 320x480 pixels, this use more.Pt:point, is a standard length unit, 1pt=1/72 inches, used in the printing industry, is very simple and easy to use;sp:scaled pixels (zoom i

Work, there will always be a task to develop a new page, the general process is the product manager to determine the page and function to develop, and then the designer to provide the design manuscript, then by our developers to complete the development work.Usually, the designer provides the design of the dimension will be very detailed, such as when it comes to words, word size, location, color, font, etc., will be one by one mark. Note that the designer offers all dimensions in px(pixels).How

compared to the difference is more obvious. Dip 　　Exactly the same as DP, except the name is different. The dip was used in earlier versions of Android, and the DP name was later recommended for unification with SP. Sp Abstract pixels independent of scale (Scale-independent Pixel). The SP a

Comparison of pixel units dp, px, pt, and sp in androidDp (dip): device independent pixels (device independent pixel ). different devices have different display effects, which are related to the hardware of the device. We recommend that you use this function to support WVGA, HVGA, and QVGA without pixels. Px: pixels (pixels). Different devices have the same display effect. Generally, we use HVGA to represent 320x480 pixels, which is usually used. Pt:

http://blog.csdn.net/jiangwei0910410003/article/details/40509571Today started my app development, because I have been doing the SDK, so the interface UI is very few, just started to do Android applications, there is no dp,px,sp and other concepts have a deep understanding, only know their transformation, and write a conversion tool class. Android has been doing m

Today started my app development, because I have been doing the SDK, so the interface UI is very few, just started to do Android applications, there is no dp,px,sp and other concepts have a deep understanding, only know their transformation, and write a conversion tool class. Android has been doing more than a year, and now to start app development, decided not t

This article is reproduced in http://blog.csdn.net/student9128/article/details/53932470It is well known that the conversion between DP and PX,SP and PX is essential in Android development, and the following code is recorded:1 Public classDisplayutils {2 /**3 * Convert PX to its equivalent DP4 * 5 * Convert px to equal DP6 */7 Public Static intPX2DP (Context context,floatpxvalue) {8

Size Units (px, dpi, dp, dip, and sp) of the View for android Application Development, and androiddpi I. pixel (px) and screen resolution 1) px (Pixels, Pixels): corresponds to the actual Pixels on the screen. For example, 320*480 screens have 320 pixels horizontally and 480 pixels vertically. 2) the screen resolution is the total number of physical pixels displayed on the screen. It is equal to the number

ScreenTyep WidthPixels HeightPixels SizeRange (inches) Screen density QVGA 240 320 2.6-3.0 Low WQVGA 240 400 3.2-3.5 Low Fwqvga 240 432 3.5-3.8 Low HVGA 320 480 3.0-3.5 Medium WVGA 480 800 3.3-4.0 High FWVGA 480 854 3.5-4.0 High WVGA 480

Difference between dip, dp, sp, pt and px in Android, androiddip 1. Overview In the past, programmers often designed computer user interfaces in pixels. For example, the image size is 80x32 pixels. The problem with this processing is that if you run the program on a new display with a dot (dpi) higher per inch, the user interface will look small. In some cases, the user interface may be small to difficult t