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Prevent screen rotation on Android
...would like to prevent from rotating because I'm starting an AsyncTask, and screen rotation makes it restart.
15 Answers
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How to calculate dp from pixels in android programmatically [duplicate]
...ical density of the display", "This value does not exactly follow the real screen size" , "To obtain the current density for a specific display, use densityDpi" . However, now that I've tested both ways, both seem to work fine. Just try to prefer float or double instead of int, because int might los...
What to put in a python module docstring? [closed]
...ment variables, and files. Usage messages can be fairly elaborate (several screens full) and should be sufficient for a new user to use the command properly, as well as a complete quick reference to all options and arguments for the sophisticated user.
The docstring for a module
should genera...
Why fragments, and when to use fragments instead of activities?
... is important information that I found on fragments:
Historically each screen in an Android app was implemented as a separate Activity. This creates a challenge in passing information between screens because the Android Intent mechanism does not allow passing a reference type (i.e. object) direc...
How do I keep the screen on in my App? [duplicate]
...* This code together with the one in onDestroy()
* will make the screen be always on until this Activity gets destroyed. */
final PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
this.mWakeLock = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK, "My...
Understanding Canvas and Surface concepts
...:
A Surface is an object holding pixels that are being composited to the screen. Every window you see on the screen (a dialog, your full-screen activity, the status bar) has its own surface that it draws in to, and Surface Flinger renders these to the final display in their correct Z-order. A su...
扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...omponent is an item that the app can use. It could be visible on the phone screen such as a button or label, or it could be non-visible, such as a camera or a sensor. Each component has a set of blocks that the programmer can use to control its behavior.
Figure 1. Blocks for an App Inventor app t...
扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...omponent is an item that the app can use. It could be visible on the phone screen such as a button or label, or it could be non-visible, such as a camera or a sensor. Each component has a set of blocks that the programmer can use to control its behavior.
Figure 1. Blocks for an App Inventor app t...
扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...omponent is an item that the app can use. It could be visible on the phone screen such as a button or label, or it could be non-visible, such as a camera or a sensor. Each component has a set of blocks that the programmer can use to control its behavior.
Figure 1. Blocks for an App Inventor app t...
扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...omponent is an item that the app can use. It could be visible on the phone screen such as a button or label, or it could be non-visible, such as a camera or a sensor. Each component has a set of blocks that the programmer can use to control its behavior.
Figure 1. Blocks for an App Inventor app t...