auto sync data android

Android Developers use the POST method to request and send data to the server.The GET method is described above. Now try POST#1. First, use a new servlet to process login requests package com.wzw.servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * Servle

Android obtains http request json data, androidjson Package com. my. gethttpjsondata; Import java. io. BufferedReader;Import java. io. ByteArrayOutputStream;Import java. io. InputStream;Import java. io. InputStreamReader;Import java.net. HttpURLConnection;Import java.net. URL;Import java. util. ArrayList;Import java. util. HashMap;Import java. util. List;Import java. util. Map;Import org. json. JSONArray;Im

4 data storage methods in Android:1.SharedPreference2.SQLite3.ContentProvider4.File 1.SharedPreference 1) Lightweight data storage mode a 2) is essentially an XML file that stores Key-value key-value pairs of data 3) to hold configuration information for an application's parameters/properties The Sharedpreference o

When data is transmitted between activities, in order to avoid the trouble, some values are often encapsulated into objects, and then the entire object is passed over. The parcelable interface and the serializable interface can be implemented when an object is uploaded. 0. Two interfaces are explained: 1) the serializable interface is supported by javase itself. 2) parcelable is a unique feature of Android,

I. Intent Functions Intent is frequently used in Android. Whether it is page transfer, data transfer, or external callProgramIntent is required for all system functions. Android has three basic components: Activity, service, and broadcastreceiver. They are all activated through the intent mechanism, and different types of components have different ways to tra

In the previous blog post, we demonstrated the intent to return data by demo, which we continue to demonstrate through a demo, given the importance of the intent to return the data.In this demo, we enter the user name and password in the other activity, the user clicks the Back button, returns to Mainactivity, the user name and password back, and displays in the Mainactivity TextView.1. In Activity_main.xml, add TextView and button.linearlayout xmlns:

I. Data storage File: In android, you can create a file to save data on the storage device of the device or an external storage device. By default, files cannot be shared among different programs. Context in android provides several methods for file operations. 1). openFileOutput (file name, operation mode ). 2). openF

JSON data parsing for Android developmentThis blog is mainly about the use of Google's Lib library Gson parsing JSON data, because Android's own JSON data parser can only be used in Android version 3.0 or more, if you need to use Gson, We need to add the Gson Lib library fi

FileOutputStream (file); O Bjectoutputstream Oos = new ObjectOutputStream (FOS), Oos.writeobject ("flyelephant");//write Fos.close (); Close output stream} catch (FileNotFoundException e) {//TODO auto-generated catch Blocke.printstacktrace ();} catch (IOException e) { TODO auto-generated catch Blocke.printstacktrace ();} LOG.I ("Com.example.googlefile", File.getabsolutepath ());First, you need to determine

1. Content ProviderSQLite saves each application's own database, which is inaccessible between application databases , and content Provider solves this problem.It stores data that can be accessed by individual applications, can create content Providerin its own application, or can directly use existing content Provider.2.ContentResolverContentresolver cr=context.getcontentresolver ();//Get the object through the ContextIn

contact information on the deviceContent://contacts/people/45 This URI returns a single result (contact record with ID 45 in the contact information)Although this query string format is common, it still seems a bit confusing. To do this, Android offers a range of helper classes (under the Android.provider package),It contains a lot of query strings in the form of class variables, which is easier for us to understand, so as above content://contacts/pe

. Here is another thread in the main thread. New Thread (new Runnable () {@ Override public void run () {// code for getting data}). start (); The following is the main activity code.1 package com. example. jsonanalysis; 2 3 import org. json. JSONArray; 4 import org. json. JSONObject; 5 6 import android. OS. bundle; 7 import android. app. activity; 8 import

Several ways to transmit data with Intent Click here to obtain the complete code In addition to returning data from an activity, we often need to transmit data to the activity. For this purpose, we can use the Intent object to pass the data to the target activity. 1. Create a project named PassingData and add a

android. app. service; import android. content. intent; import android. OS. IBinder; import android. widget. editText; public class MyService extends Service {String data; boolean running = false; @ Override public IBinder onBind (Intent intent) {// TODO

As a complete application, data storage operations are essential, so the Android system provides four ways to store data: Sharedpreference, File, SQLite, and content Provider. As the Android system, the data are basically private, are stored in the "