Android skin replacement

Android skin replacement

Understand skin replacement implementation and differences between different solutions and usage scenarios.

I. functional division

1) The software has multiple built-in skins, which cannot be modified by the user;

2) The official website provides skin downloads. Users can use the downloaded skin;

3) The official website provides skin preparation tools or methods for users to make skin.

Ii. Skin Definition

The software skin includes icons, fonts, la S, interactive styles, etc. Skin replacement is to replace some or all of the skin's resources.

3. Separation of skin and app

1) Pack skin files

The default format is APK. For example, launcher, whose desktop skin format is an APK;

The custom format is zip. For example, the moji weather skin extension is mja, And the sogou input method's skin extension is SGA. Their file formats are actually zip.

Iv. Resource Access

1) APK format

The condition for reading data between apks is that they have the same signature and androidmanifest. configure Android: shareduserid in XML to have the same attribute value, so that the two apks run in the same process and can access data from each other.

The method is as follows:

A) configuration in androidmanifest. xml of applications and skin programs

For example, Android: shareduserid = "com. ZJ"

B) the file name must be consistent with the skin file name of the same function in the application APK.

For example, the background image path of the application is \ skin \ res \ drawable-hdpi \ xx.png.

The path of the background image file in the skin APK should also be: Skin \ res \ drawable-hdpi \ xx.png

C) how to access resources

Context context = createpackagecontext ("com. ZJ. Skin", context. context_ignore_security );

Obtain the context corresponding to com. ZJ. skin, and access any resources in COM. ZJ. Skin Through the returned context object.

For example, to apply apkto bg.png in apk,

Drawable = context. getresources (). getdrawable (R. drawable. bg );

In this way, the image reference is obtained, and other XML resource files are obtained in a similar way.

2) custom extension ZIP format skin

Focus: Read the resources in the ZIP file and the storage policy of the skin file.

Solution: If you read the skin files on the SD card at each startup, the app execution speed will be affected. It is best to provide a skin setting interface to decompress the selected skin file to the skin path, so that it does not need to be read across memory, which is faster, and does not need to be read from the zip package each time, it does not depend on the files in the SD card, even if the skin package is deleted.

Implementation Method:

A) Ask the user to copy the skin file to the path specified by the SD card with help from the software or official website.

B) Provide the skin setting interface in the software. It can be in the menu or in the settings. You can refer to moji, sogou input method, QQ, and other software that supports skin replacement.

C) load the skin file in the specified path, read the thumbnail, and display it on the skin settings page. decompress the selected skin file to the skin path.

D) The app preferentially reads Resources in the skin path. If not, use the resources in the APK.