imo for android 2 3

Recently, the company organized project team members to develop an Android project demo, no one has andoid development experience, are developing C #. Although the project requirements are not very high, but for those who do not have this experience, the first step is the most difficult.The project lasted one months, 4 people developed, the final line into a usable demo, the overall effect is very good. This one borrowed from the online "Imitation Net

compilation is very time-consuming, we can use Log breakpoint to print logs. Do not modify source code. You can view the printed logs on the console in the Debug window. Method breakpoint: The method breakpoint is the same as the function name. It is the breakpoint at the function entry and end. Exception breakpoint: Run-> View blockpoint-> javaException. Attribute breakpoint: When an attribute is modified or accessed, it is hard to find out in a complex multi-threaded environment. Run-> View b

. Layer 3 (): attribute (Note: I will not elaborate on some repeated applications) 1. android: alwaysRetainTaskState Whether to keep the status unchanged. For example, if you switch back to home and open the activity again, the activity is in the final state. For example, if a browser has many statuses (when multiple tabs are opened) and you do not want to l

, it indicates that you have the corresponding permissions. 2) If not, go to PackageManagerService. mSystemPermissions. This information is read from/system/etc/permissions/platform. xml at startup. Permission corresponding to uid of some system-level applications is recorded here. 3) return results. 4.2. CheckUriPermission1. if the uid is 0, it indicates that it is a root user, and the permission is not co

Example of SurfaceView oscilloscope: directly add the code The program automatically draws the sine wave and Cosine waveform on the Screen Based on the button clicked. Each time the program draws, it only needs to draw (update) the waveform of the current point. The previously drawn waveform does not need to be updated. The lockCanvas (Rect r) method of SurfaceHolder is used. 1. Layout file Layout/show_wave.xml: [Html]Xmlns: android = "http://schemas

Android fragmentation knowledge concentration (2): Android knowledge concentration 1. Obtain the height of the title bar. Rect frame = new Rect();getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);int statusBarHeight = frame.top;int contentTop = getWindow().findViewById(Window.ID_ANDROID_CONTENT).getTop();int titleBarHeight = contentTop - statusBarHe

generate a resource index file similar to R.java when Asop compiles, these files are used to invoke system resources. Not public is not declared, that is, you can not even know the ID, you can not get the corresponding resources. I have roughly read the parsing implementation of XML, found that the end of all into the native layer, in the native layer in C + + implementation, which let me look at code sigh.However, the various styles of ProgressBar should be set through the API, which I have no

because it can be called directly without a virtual function table. In addition, you can declare that the function call does not change the object state. Getter and setter are not required In many local languages such as C ++, getter (for example, I = getcount () is used to avoid direct access to the member variable (I = mcount ). This is a good habit in C ++, because the compiler can be accessed inline. If you need to constrain or debug variables, you can add code at any time. On

1. How many menus are available in Android? The onoptionitemselect () method is used to click the menu option corresponding to the optionmenu. The method for clicking the menu option corresponding to the context menu contextmenu is oncontextitemseclect (). Remember to make it dependent on a component, such as textview, when using the contextmenu, registry: registerforcontentmenu (view) The function menu (sub-menu) submenu and option menu use the sa

Android Application development performance optimization 3: merge tag, androidmergeI have never used the merge tag during development. After my colleagues told me about it, I tried to use the merge tag, it is found that this label is indeed very helpful for application layout optimization. Today, I will briefly describe the usage of this label. Speaking of We will use an example to understand the actual fu

Android cainiao study note 13 ---- Android controls (2) simple examples of custom controls, android Custom Controls Sometimes, you may feel that the control provided by the system is too ugly, and you need to customize the control to achieve the desired effect. The following is a reference to the first line of code. 1.

ImageView form a binding relationship between weak references !!!! BitmapDownloaderTask bitmapDownloaderTask = new BitmapDownloaderTask (imageView); // 2. Create a DownloadedDrawable. // you can see through the DownloadedDrawable construction method: // This DownloadedDrawable weak reference to this bitmapDownloaderTask DownloadedDrawable downloadedDrawable = new DownloadedDrawable (bitmapDownloaderTask); // 3