Android

Search for a specified file: Public String searchfile (string filename) {string res = ""; file [] files = new file ("/sdcard "). listfiles (); For (file F: Files) {If (F. isdirectory () searchfile (F. getname (); elseif (F. getname (). indexof

In application DetectionProgramWhen upgrading, you must first obtain the version number and compare it with the server to determine whether to upgrade. Android has two version numbers: versioncode, versionname, and versionname) The specific

Before using sqlite3, I did not notice the sqliteopenhelper class, so I had to create and maintain databases and data tables in the activity. However, with the sqliteopenhelper class, you can separate the maintenance of databases, data tables,

Sometimes we may need to combine the two images to make them a synthetic image. below is my documents for future review. Public bitmap diejia (Bitmap B ){ If (! B. ismutable ()){ // Set the image to transparent as the background B = B. Copy

Let's talk about the principle. As you know, android can monitor databases. However, I personally feel that this monitoring is not powerful. No matter how the monitoring is implemented, the final result returned is whether the database has changed

First view; Read the code in detail; Package COM. taskmanage. file; import Java. util. arraylist; import Java. util. collections; import Java. util. hashmap; import Java. util. iterator; import Java. util. list; import Java. util. map; import

Obtain the MAC address: public String getLocalMacAddress() { WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE); WifiInfo info = wifi.getConnectionInfo(); return info.getMacAddress(); } Or: private

In Android, scheduled operations rely on the alarmmanager class to complete this function. : The following is an example: Datesetactivity: package com.hello.project;import java.util.Calendar;import android.app.Activity;import

I recently used gravity sensing in Android in my project. I will share it with you. The gravity sensor coordinate is relative to the device, not the spatial coordinate, The Code is as follows; Package COM. pioneersoft. temp; import android. app.

In Android, many permissions are defined for some system-related operations, such as phone calls, text messages, and file writing, to ensure security. To ensure application security and stability, we can customize some permission mechanisms to

When the Android system is started, the system automatically scans the files in the sdcard and stores the obtained information in a system database. The program wants to access the system file information, instead of directly retrieving data from

In Android, images in GIF format cannot be directly loaded, but can only be implemented through the auxiliary class movie. The specific method is as follows; public class DrawMusicNote extends View {private Movie mMovie;private long

Obtain the height of the status bar and title bar.Retrieve the status bar height:The getwindowvisibledisplayframe method can obtain the display area of the program, including the title bar, but not the status bar.So we can calculate the height of

Recently, you need to specify the size and location of the imageview in the code when you are working on a project. After a day of research, you can finally share it with us.Hope to help you The following uses imagview as an example:// Obtain

To sum up the adaptability of Android development, we recommend that you use screen density dip for the control spacing and size to avoid too many differences. Method for obtaining screen density; Displaymetrics dm = new displaymetrics ();Dm =

: Note: Line 1: Application name Row 2: application package name Row 3: Application entry activity name The Code is as follows: Package COM. hello. project; import Java. util. arraylist; import Java. util. collections; import Java. util.

There are two ways to handle dialog box events: There are two methods for event listening in the dialog box: 1. Listen to the dialog event; To listen to the back key event, you only need to implement the dialoginterface. onkeylistener interface. The

Hide the title bar and hide the status bar Android: theme = "@ Android: style/theme. notitlebar. fullscreen"Android: theme = "@ Android: style/theme. translucent"Android: theme = "@ Android: style/theme. Dialog" // Initialize the screen

Use broadcast intent to control the built-in music player in Android   Zhengzhiren Http://blog.csdn.net/ZhengZhiRen/archive/2011/01/13/6134730.aspx   The music player that comes with Android can only be regarded as an application on the system and

People who use the launcher of ADW should be somewhat impressed with the function, that is, to drag the application or widget icon to the delete icon and stay for more than 1 second, The "drop to uninstall" prompt is displayed. If you open it, open