Android

I started to study Android development and encountered a problem when setting up the development environment ...... It is a tough task ~ JDK is installed, environment variables are configured, the full version of ADT is installed, and helloworld is

It is necessary for the user to give a prompt before exiting the application, because it may be because the user does not really want to exit, but accidentally presses the return key, most applications provide a dialog before exiting the application.

It should be noted that, when the jar package and resource package are provided to third-party developers, the code of our project cannot be similar to R. layout. main, R. string. name and so on. Therefore, we cannot directly use the R file. Instead,

The ToggleButton status can only be selected or not selected, and different display text needs to be set for different states. The following uses ToggleButton: Directory structure Main. xml layout FileCopy codeThe Code is as follows: Android:

1. Image Processing 1. rounded corner Image Copy codeThe Code is as follows :/** * Convert to rounded corner * * @ Param bmp * @ Param roundPx * @ Return */ Public static Bitmap convertToRoundedCorner (Bitmap bmp, float roundPx ){ Bitmap newBmp =

@ Drawable/icon@: Represents R. javaDrawable: internal class drawableIcon: the object whose id is iconThe id of the drawable internal class in the R. java file is the constant corresponding to the icon value. Android: label = "window title">

During development, we often need to set our application to full screen. There are two methods: one is to set in the code, and the other is to change it in the configuration file! 1. Set in the Code: Copy codeThe Code is as follows: package com.

Introduction The Matrix of Android deformation (Transform) is used to summarize the use of Camera. Camera mainly implements 3D deformation, rotation, rotation, etc. The source code of Camera is Native (Local Code) the provided interfaces are also

Introduction Recently, we have been studying Android deformation. Android 2D deformation (including scaling, distortion, translation, and rotation) can be achieved through Matrix, while 3D deformation can be achieved through Camera. Next we will

The event types in android include button events and screen Touch events. Touch events are the basic events of screen Touch events, so it is necessary to have a deep understanding of them. A simple screen Touch action triggers a series of Touch

Copy codeThe Code is as follows: package com. eboy. testyaoyiyao; Import java. text. SimpleDateFormat; Import java. util. Date; Import android. app. Activity; Import android. hardware. Sensor; Import android. hardware. SensorEvent; Import android.

File Storage: Copy codeThe Code is as follows: public class MainActivity extends Activity { EditText mname, mage; TextView mtv; @ Override Protected void onCreate (Bundle savedInstanceState ){ Super. onCreate (savedInstanceState ); SetContentView (R.

There are two sets of methods to update the view in Android: invalidate and postInvalidate. The former is used in the UI thread itself, the latter is used in non-UI threads. Android provides the Invalidate method to refresh the interface, but

The Input Method Editor (IME) is a control that allows users to input text. Android provides an extensible Input Method framework that allows applications to provide users with additional input methods, such as soft keyboard or voice input. Once

Copy codeThe Code is as follows: // declare the LocationManager object LocationManager loctionManager; // Obtain the LocationManager object through system services LoctionManager = (LocationManager) getSystemService (Context. LOCATION_SERVICE

Some new Android users may be troubled by the conversion between JAVA data types, such as the conversion between integer, float, and double types, and between integer and String types, and Handling and displaying time issues. Below I will introduce

When using TextView, The ellipsis is automatically displayed if the length is too long. native support is available in android, which is defined as follows: Copy codeThe Code is as follows: Android: ellipsize = "end" Android: singleLine = "true"/>

Objective: 1. Master how to build Gallery in Android2. A preliminary understanding of the principles of Android adapters3. implement simple control scaling Animation Introduction: 1. Gallery is a built-in control of Android. It can inherit images

When developing Android, you may encounter one of the following scenarios: You want to download the application to the root directory of the current application, not the SD card. Then, the file can be accessed by the application or other

Android does not have its own color editor. In order to allow users to select colors intuitively, this control is made as follows: The color bar above is the main color bar. You can select the desired color. below is the balance adjustment of the