第 10 章 存储

			
Log.d(TAG, getContext().getFilesDir().toString());	
			
			

遍历目录

			
        AssetManager assetManager = MainApplication.getContext().getApplicationContext().getAssets();
        try {
            String[] filelists = assetManager.list("");
            for (int i = 0; i < filelists.length; i++) {
                Log.d(TAG, filelists[i]);
            }

        } catch (IOException e) {
            throw new RuntimeException(e);
        }			
			
			

复制 Assets 到指定目录

			
			
	private synchronized boolean copyAssetsData() {

        AssetManager assetManager = MainApplication.getContext().getApplicationContext().getAssets();

        try {
            List<String> files = List.of(assetManager.list(""));

            for (String file : files) {
                Log.d(TAG, "coping " + file);

                String target = workspace.concat("/").concat(file);
                InputStream in = null;
                OutputStream out = null;

                try {

                    Log.i(TAG, "copying asset files from [" + file + "] to [" + target + "]");
                    in = assetManager.open(file);
                    (new File(target)).createNewFile();
                    out = new FileOutputStream(target);


                    byte[] data = new byte[1024];
                    int length = -1;

                    while ((length = in.read(data)) != -1) {
                        out.write(data, 0, length);
                    }

                    out.flush();

                } catch (Exception e) {
                    Log.e(TAG, "skip asset files from [" + file + "] to [" + target + "]", e);
                } finally {
                    if (in != null) {
                        try {
                            in.close();
                        } catch (IOException e) {
                            Log.e(TAG, "" + e);
                        }
                    }

                    if (out != null) {
                        try {
                            out.close();
                        } catch (IOException e) {
                            Log.e(TAG, "", e);
                        }
                    }

                }

            }


        } catch (IOException e) {
            e.printStackTrace();
            return false;
        }
        Log.d(TAG, "Copy assets files");
        return true;
    }			
			
			
			

			
Log.d(TAG, Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).toString());
Log.d(TAG, getExternalFilesDir(Environment.DIRECTORY_PICTURES).toString());
            		
/storage/emulated/0/Pictures
/storage/emulated/0/Android/data/cn.netkiller.album.education/files/Pictures		
			
			

公共存储目录不会因为APP卸载而删除

		
Environment.getExternalStorageDirectory():                     /storage/emulated/0
Environment.getExternalStoragePublicDirectory(""):             /storage/emulated/0
Environment.getExternalStoragePublicDirectory("test"):         /storage/emulated/0/test
Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES)：  /storage/emulated/0/Pictures
		
			

		
Environment.getDataDirectory():      /data
Context.getCacheDir():               /data/data/cn.netkiller.test/cache
Context.getFilesDir():               /data/data/cn.netkiller.test/files
Context.getFileStreamPath(""):       /data/data/cn.netkiller.test/files
Context.getFileStreamPath("test"):   /data/data/cn.netkiller.test/files/test
		
		
			

		
Environment.getExternalStorageDirectory():               /storage/emulated/0
Context.getExternalCacheDir():                           /storage/emulated/0/Android/data/cn.netkiller.test/cache
Context.getExternalFilesDir(""):                         /storage/emulated/0/Android/data/cn.netkiller.test/files
Context.getExternalFilesDir(null):                         /storage/emulated/0/Android/data/cn.netkiller.test/files
Context.getExternalFilesDir("test"):                     /storage/emulated/0/Android/data/cn.netkiller.test/files/test
Context.getExternalFilesDir(Environment.DIRECTORY_PICTURES):    /storage/emulated/0/Android/data/cn.netkiller.test/files/Pictures		
		
			

		
public static String DIRECTORY_MUSIC = "Music";
public static String DIRECTORY_ALARMS = "Alarms";
public static String DIRECTORY_NOTIFICATIONS = "Notifications";
public static String DIRECTORY_PICTURES = "Pictures";
public static String DIRECTORY_MOVIES = "Movies";
public static String DIRECTORY_DOWNLOADS = "Download";
public static String DIRECTORY_DCIM = "DCIM";
public static String DIRECTORY_DOCUMENTS = "Documents";