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This article mainly explains "how to read and write resource files in the assets directory in Android". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to read and write resource files in the assets directory in Android".

1. Several API commonly used by AssetManager to read files

1. File reading mode

AssetManager.open (String filename), which returns a byte stream of type InputSteam, where the filename must be a file, not a folder. The open method of AssetManager opening a resource file is an overloaded method. You can add an open int parameter, which can be done according to the parameters.

two。 Resource files can exist in folders and subdirectories

Public final String [] list (String path), which returns the names of all files and subdirectories under the current directory. Access to all resource files can be achieved by recursively traversing the entire file directory. String [] Array of strings, one for each asset. These file names are relative to 'path'. You can open the file by concatenating 'path' and a name in the returned string (via File) and passing that to open ().

Second, the relevant implementation code

Resource APK (A.apk)

For the specific implementation code snippet, due to the use of system permissions, the generated path can be changed to B.apk by yourself.

Public void onCreate (Bundle savedInstanceState) {super.onCreate (savedInstanceState); setContentView (R.layout.main); try {ctxDealFile = this.createPackageContext ("com.zlc.ipanel", Context.CONTEXT_IGNORE_SECURITY);} catch (NameNotFoundException E1) {/ / TODO Auto-generated catch block e1.printStackTrace () } btn3.setOnClickListener (new OnClickListener () {@ Override public void onClick (View v) {/ / TODO Auto-generated method stub try {String uiFileName = "ipanelJoin"; deepFile (ctxDealFile, uiFileName) } catch (Exception e) {/ / TODO Auto-generated catch block e.printStackTrace (); textView.setText ("file is wrong");}) / /} public void deepFile (Context ctxDealFile, String path) {try {String str [] = ctxDealFile.getAssets () .list (path); if (str.length > 0) {/ / if it is a directory File file = new File ("/ data/" + path); file.mkdirs () For (String string: str) {path = path+ "/" + string; System.out.println ("zhoulc:\ t" + path); / / textView.setText (textView.getText () + "\ t" + path+ "\ t"); deepFile (ctxDealFile, path) Path = path.substring (0, path.lastIndexOf ('/');}} else {/ / if it is a file InputStream is = ctxDealFile.getAssets () .open (path); FileOutputStream fos = new FileOutputStream (new File ("/ data/" + path)); byte [] buffer = new byte [1024] Int count = 0; while (true) {count++; int len = is.read (buffer); if (len = =-1) {break;} fos.write (buffer, 0, len) } is.close (); fos.close ();}} catch (IOException e) {/ / TODO Auto-generated catch block e.printStackTrace () }} Thank you for your reading, the above is the content of "how to read and write resource files in the assets directory in Android". After the study of this article, I believe you have a deeper understanding of how to read and write resource files in the assets directory in Android, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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