Android

1. What is density 1) Density Density represents the number of display points per inch (logical value), its unit is DPI:DOT/inch, usually large screen, density large, screen hours, density small, usually When the actual screen resolution is 240

Preface Come to a new company, write code before, I usually find the leader to develop norms. However, many companies do not have any development specifications, or the development of specifications is really very simple, only to modify the

Most of the time, we'll go through the ADB to view SQLite database and table creation But today I used the "ls" command to view the file, but reported the "Opendir failed, Permission denied" error. The reason for this error is that the program did

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In the startthreadpool () function of frameworks/base/libs/binder/processstate. cpp, The function was declared at the beginning: Automutex _ L (mlock ); It's not complicated, but I feel very thoughtful. In frameworks/base/include/utils/Threads.

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Due to xxxx's browser business customization requirements, secondary development is required based on the android browser application. The following section uses the browser source code to share some problems and experiences encountered during the

Some ADB commands are often used in my work. Today I have summarized some common commands of Android ADB, hoping to help you a bit: 1. Install the APK package: Tools> ADB install xxx.apk enter 2. Uninstall the APK package: Tools> ADB uninstall

 Message Processing Mechanism in Android Development (II) -- message loop /* * Message Processing Mechanism developed by Android (2)-message loop * Beijing Android Club group: 167839253 * Created on: 2011-9-1 * Author: blueeagle * Email: liujiaxiang@

  Exploration of positioning service (GPS) on Android platform)   Note: Do not forget to add permissions for all of the following operations:   Locationmanager You can use locationmanager to locate, track, and approaching devices. It

Create a content provider The content provider Manages access to the central data warehouse. You implement a provider that implements one or more classes in an android application, and adds some elements in the manifest file. You implement a

There are very few BT drivers on the Internet, so I recorded the steps during the development process. For mutual learning and discussion. 1. Migration of Bt DRIVER: 1. enableeffectch in boadconfig. mk Board_have_bluetooth: = true 2. Implement

Bitmap rotation can also be achieved through matrix or canvas. The postrotate method is used to set the rotation angle. Then, the createbitmap method is used to create a bitmap object that has been rotated. Finally, the drawbitmap method is used to

Bus Transfer Route Search and transitoverlay Here, only Java code is provided. For XML code, refer to: learning notes for Android and learning Baidu Map Important code: Mkplannode start = new mkplannode (); // start point: Tiananmen start.pt = new

If you want to implement a download function, of course, the ideal function must support multi-task simultaneous download and resumable download, I want to step by step, first of all, the difficulty lies in the multi-task here. My idea is to start

  Recently, for project reasons, we need to implement an incoming call listener and generate a floating window to prompt relevant information (which is inconvenient to disclose ). Now let me give a rough picture of my ideas and implementation

Telephonymanager is a telephone function-related class in Android, which defines many constants. To obtain the following information, you must specify the permission in androidmanifest. xml. I. Data Connection status Get data connection status: int

Here is a simple source code for making a flashlight: 1. xml layout: 2. actity code: Package COM. diecolor; import android. app. activity; import android. hardware. camera; import android. hardware. camera. parameters; import android. OS.

Due to limitation of Android tab component I created a custom tabwidget that I am using in couple different projects already. the widget allows us to add custom background and use custom icons, tabs can be top/bottom aligned. Currently tabs can

Iv. Android-layer source code parsing On Linux, Android software stacks are encapsulated and used in the upper-layer Java applications. Sleep wake-up is also a command issued from the top layer. Then, the parameter is parsed layer by layer, passed