Transparent background settings for Android sufaceview

I have never touched surfaceview before, and now the project needs to be used. I found that the background of surfaceview becomes dark when it is being drawn (canvas drawing. I tried to set it as background transparency in XML, but it didn't work.

About accessing the local address of the android Simulator

The android simulator uses it as localhost, that is,CodeAccess using localhost or 127.0.0.1! This cannot be done!If you want to access your computer on the simulator, use the built-in Android IP address.10.0.2.210.0.2.2 is the specific IP address

Android: how to open database files in the assets or raw folder

You cannot open database files in the res raw directory in Android.InProgramCopy the file to a directory in the phone memory or SD card at the first startup, and then open the database file.   The basic method of copying is to use the getresources

How to calculate the width and height of the string to be displayed in Android

Google found that there are several ways to do this in Android, but after actual testing, we found that the following method is the most accurate Rect bounds =NewRect (); string text= "Hello World"; Textpaint paint; Paint=Findviewbyid (R. Id. hello_

Solution to WiFi connection failure of Android

    In recent tests, mobile phones often fail to connect to wifi, and "Restore factory settings" cannot connect to wifi. after endless searches and flashing, there is still no solution, later, I finally found the third solution to solve my problem

About Android integrated development environment-Introduction of jar package errors

  I recently went to the android official website and found an integrated development environment. It feels good to download and use it. However, when I use an external jar package, I often report an error. I have solved this problem. Today I have

Android architecture diagram and main categories

Main classes: Android. app: provides high-level program models and basic runtime Environments Android. content contains various classes for accessing and publishing device data. Android. Database: browses and operates databases through content

Android bitmap automatically draws text line breaks

public Bitmap getNewBitMap(String text) { Bitmap newBitmap = Bitmap.createBitmap(120,150, Config.ARGB_4444); Canvas canvas = new Canvas(newBitmap); canvas.drawBitmap(bmp, 0, 0, null); TextPaint textPaint = new TextPaint();

How does Android disable automatic focus Retrieval for edittext?

In the project, when you enter a page, edittext automatically obtains the focus by default. So how to cancel this default behavior?   I have been searching for it online for a long time. I have listened to a soft keyboard event and called the

Android: Getting camera frame data to convert Image

Part 1: Because the camera Preview Data in android can only be in the imageformat. nv21 format, decoding should go through a twists and turns. Camera mcamera = camera. open (); camera. parameters P = mcamera. getparameters (); p. setpreviewformat

Watermarks and text for Android Images

Two methods: 1. directly write the text string STR = "Text to be written by PICC"; imageview image = (imageview) This. findviewbyid (R. id. imageview); bitmap photo = bitmapfactory. decoderesource (this. getresources (), R. drawable. text); int

A program for reading contact information in Android, including reading the contact name, mobile phone number, and email address

1: androidmanifest. XML content It is important to set up a test environment and add the permission to read and write contact information. 2:

Android unit test JUnit

During project creation, unit tests are usually required to test whether the code you write runs normally. Some potential bugs can be killed at the birth stage of the program, in particular, for large-scale projects that cooperate with teams, unit

Language switching for Android applications

Recently, the language switching function was used in the project. The first thought was the resource file. That's right. Create a folder values-en in the resource file and create a strings in it. XML, put strings in the default values folder. copy

About getting the Wi-Fi-IP address of Android

When I was working on a project recently, I encountered a small problem and recorded it in my blog. Because the project needs to obtain the WiFi-IP address of the current Android system, it is habitually searched on the Internet, and a code segment

Android sending information Simulation System

The Android system already has the familiar and commonly used sending information function, which is called the activity in the program, sometimes we need to call this application when writing an android program to send information through our

Problems in android unit testing

Yesterday I also just summarized an article on unit testing in my blog. Who knows that I encountered a problem when I wrote a unit test this afternoon and had to solve it until now. The following problem is always prompted during unit test

Android File Access

Today, I learned about the file access technology of Android, and many times I need to use file access functions in Android, that is, we can store the desired file, read the file content, and perform other operations on our mobile phone or SD card

Android stores data to sdcard

The previous time I wrote common android operations on file access. During Android development, you will also encounter access operations to files on sdcard. The following operations write data to sdcard: 1 public void saveToSDCard(String filename,

Android dialing device

During Development in the android simulator, you sometimes need to simulate the call function. Because the simulator cannot be directly used as a real machine, we need to simulate a real machine call in the simulator, first, you need to create two

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