复制asset中内容到SD卡上

最新推荐文章于 2018-08-07 15:16:58 发布

原创最新推荐文章于 2018-08-07 15:16:58 发布 · 1.4k 阅读

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CC 4.0 BY-SA版权

本文介绍了一个用于在Android应用中从资源目录复制文件到设备指定路径的方法实现。该方法能够递归地处理文件夹结构，并将所有文件复制到目标目录。

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/**
	 * 
	 * @param assetDir
	 * @param dir
	 */
	private void CopyAssets(String assetDir, String dir) {
		String[] files;
		try {
			files = this.getResources().getAssets().list(assetDir);
		} catch (IOException e1) {
			return;
		}
		File mWorkingPath = new File(dir);
		// if this directory does not exists, make one.
		if (!mWorkingPath.exists()) {
			if (!mWorkingPath.mkdirs()) {

			}
		}

		for (int i = 0; i < files.length; i++) {
			try {
				String fileName = files[i];
				// we make sure file name not contains '.' to be a folder.
				if (!fileName.contains(".")) {
					if (0 == assetDir.length()) {
						CopyAssets(fileName, dir + fileName + "/");
					} else {
						CopyAssets(assetDir + "/" + fileName, dir + fileName + "/");
					}
					continue;
				}
				File outFile = new File(mWorkingPath, fileName);
				if (outFile.exists())
					outFile.delete();
				InputStream in = null;
				if (0 != assetDir.length())
					in = getAssets().open(assetDir + "/" + fileName);
				else
					in = getAssets().open(fileName);
				OutputStream out = new FileOutputStream(outFile);

				// Transfer bytes from in to out
				byte[] buf = new byte[1024];
				int len;
				while ((len = in.read(buf)) > 0) {
					out.write(buf, 0, len);
				}

				in.close();
				out.close();
			} catch (FileNotFoundException e) {
				e.printStackTrace();
			}

			catch (IOException e) {
				e.printStackTrace();
			}
		}
	}