life alert app for android

The life cycle of fragmentsEach fragments has its own set of lifecycle callback methods and handles its own user input events. The corresponding life cycle can be referred to:Create a slice (Creating a Fragment)To create a fragment, you must create a subclass of the fragment (or an existing subclass of it). The Fragment class has code, looks a lot like an Activity. It contains callback methods similar to an

Yesterday Google released Android N Preview, Balabala ....I use the simulator to verify, through the long-press Multi-task window (port) into the split-screen mode, here only a simple test, do not exclude by configuring which parameters, the life cycle has other changes, Long Press (port), activity first calls onmultiwindowchanged->onpause->onstop->ondestroy->oncreate->onstart-> Onresume->onpause

Life cycle Activityhttp://blog.csdn.net/android_tutor/article/details/5772285 http://www.cnblogs.com/JohnTsai/p/4052676.html1. Go to App OnCreate (), OnStart ()->onresume ()2. Exit App OnPause ()->onstop ()->ondestroy ()3. Click Home or leave the current page OnPause ()->onstop ()4. From previous page back to current page Onrestart ()->onstart ()->onresume ()

in either of the two States, and no related service runs (OnStop () is called). The system has a background process list, which generally takes the principle of last in, first out (queue) to release background process resources 5 Empty processes: Empty process does not run any components of the process, leaving this process primarily for caching needs, For example, the next time you start this process can be faster Two Android

data about the activity state, you need to overload the onsaveinstancestate () callback method to add a key-value pair to the Bundle object. The system calls this method when the user is ready to leave your activity and passes it to the Bundle object so that your activity can be saved when it is accidentally destroyed . because the OnCreate () method is called when a new instance is created and a previous instance is rebuilt, you must check whether its state is null before you attempt to read

Objective As Android developers, presumably more or less to touch the start speed optimization related things, when the user more and more, the product function with more and more iterations, the App gradually become bloated is a very common phenomenon, even can be said to be unavoidable phenomenon, followed by the work is to optimize the performance of the app,

1, Activity profile:Activity can be easily understood as an Android phone app for every interface,It has the corresponding implementation of the Activity class Java class file (equivalent to the phone interface control related logic files, similar to the Flex page script file, or the common page form JS),There are also responses to layout XML files, pre-set responsive layout controls and their size, color,

http://hukai.me/android-training-managing_your_app_memory/The Random Access Memory (RAM) is a valuable resource in any software development environment. This is especially true on mobile operating systems where physical memory is usually limited. While Android's Dalvik virtual machine plays a regular garbage collection role, it doesn't mean you can ignore the timing and location of the app's memory allocation and release.For GC to be able to reclaim m

Activity is the basic of Android development in every project that will have activity. Activity has its own life cycle, there are many blogs and materials on the Internet, here I just confirm.An activity:There are three ways to go when you open an activityOnCreateOnStartOnresumeWhen you click Fallback activityOnPauseOnStopOnDestroyWhen I click on the home buttonOnPauseOnStopOpen the

Clicking the back key of the device is equivalent to notifying the Android system "I have finished using the activity and I don't need it now." "After receiving the instruction, the system immediately destroys the activity. That is, call OnPause ()->onstop ()->ondestroy () Click on the Home key, equivalent to notify Android "I'll take a look elsewhere and maybe come back later." "At this point, for a qui

All content is sourced from official documents Https://developer.android.com/training/articles/memory.htmlOnly-to-completely release memory from your app is-to-release object references you could be holding, making the memory Available to the garbage collector.The only way to completely free memory from your app is to release the object you are referencing to make it visible to the GC.How

activity life cycle:onCreate () Create-----"OnStart () Start------" Onresume () Get focus-----"activityrunningRun------onPause () | page jump----"APP process killed-----" onCreate () re-create an interface; |-Lost Focus-------OnStop () |-application does not stop pressing the home button to return to the app-- NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP, --

Save Restore State and previous examples The android Apidemo example resolves (9): The UI for app->activity->persistent State implementation is similar, but the functionality and implementation methods are slightly different. (9) The values that are edittext in the UI are maintained through shared Preferences and Activity OnPause (), and Onresume (). This example is achieved by Onsaveinstancestate (Bundle

In the chapter on learning the Android app life cycle, the book is a little general and difficult to understand. In order to understand the deeper, wrote a program to test a bit.1. Build a dialog_layout.xml in the layout folder2. Build another normal_layout.xml in the layout folder3. Modify the Activity_main.xml in the layout folder4, write Java files, establish

This example shows how to add a simple single-page navigation, and then shows how to display all the phone numbers dialed on page 1th in page 2nd. (1) Understand the basic architecture of the Android app through this example. (2) This example to understand the implementation of Android multi-screen navigation basic technology. This example is just to give us a

a value of 3 (0x00000003) public static final int Strong>result_error_radio_off Indicates that the radio is explicitly closed with a value of 2 (0x00000002) public static final int Status_on_icc_free represents free space with a value of 0 (0x00000000) public static final int status_on_icc_read means receive and read, value 1 (0x00000001) public static final int status_on_icc_sent indicates storage and sent A value of 5 (0x00000005) public static final

Now the phone by default, you can switch between the screen, but the life cycle of the screen switching is how, today to explain, in case you develop the app screen when the game over1. Load an activity's print log without making any configuration:Print log for direction when switching screen:PS: I don't see anything here. Horizontal screen Switch vertical screen when performing two times OnCreate, personal

. We do not need to reinitialize the component in a series of callback methods that revert to the resumed state. Resume ActivityWhen the user resumes activity from the paused state, the system calls the Onresume () method.Note that every time the system calls this method, the activity is in the foreground, including the first time it is created. Therefore, you should implement Onresume () to initialize those components that are released within the OnPause method and perform the initializati

how the Android app worksAndroid is based on the Liunx kernel, but unlike traditional liunx-based PC systems,The user has no absolute control over the Android app. PC System,selecting "Exit" or "close" option on the application's system menu will kill the process directly. This is not the case with

visible to the end user. Android:versionname: String type. is for the end user to see.program requires the System API version number android:minsdkversion: To perform this program requires the lowest system API version Android:targetsdkversion: This programming when the target system API version of Android: Maxsdkversion: The highest system API version supported by this programPrepare checklist for publishing before publishing: Before you consider pu