Android sdcard操作

private final static String ALBUM_PATH = Environment
			.getExternalStorageDirectory() + "/image/";
private List<String> filenames = new ArrayList<String>();

private void createFileName(String path) {
	String[] arrpath = path.split("/");
	File sdcardfile;
	String strPath = "";
	for (int i = 1; i < arrpath.length; i++) {
		strPath = strPath + "/" + arrpath[i];
		sdcardfile = new File(strPath);
		if (!sdcardfile.exists()) {
			sdcardfile.mkdir();
		}
	}
}
private void readFileName() {
	File sdcardfile = new File(ALBUM_PATH);
	if (!sdcardfile.exists()) {
		createFileName(ALBUM_PATH);
	}

	File[] files = sdcardfile.listFiles();
	for (File file : files) {
		if (file.isDirectory()) {
			this.readFileName();
			shareJson(template_id, mSize, mType, maxValue, oName);
		} else {
			String filepath = file.getAbsolutePath();
			if (filepath.endsWith("jpg") || filepath.endsWith("gif")
					|| filepath.endsWith("bmp") || filepath.endsWith("png")) {
				filenames.add(filepath);
			}
		}
	}

}
private void DeleteFile(String filepath) {
	File file = new File(filepath);
	if (file.exists()) {
		file.delete();
	}
}
public void saveFile(Bitmap bm, String fileName) throws IOException {
	File dirFile = new File(ALBUM_PATH);
	try {
		if (!dirFile.exists()) {
			dirFile.mkdir();
		}
		File dirFileName = new File(ALBUM_PATH + fileName);
		if (!dirFileName.exists()) {
			File myCaptureFile = new File(ALBUM_PATH + fileName);
			BufferedOutputStream bos = new BufferedOutputStream(
					new FileOutputStream(myCaptureFile));
			bm.compress(Bitmap.CompressFormat.PNG, 80, bos);
			Log.i("add", "success!");
			bos.flush();
			bos.close();
		} else {
			Log.i("add", "the picture exists!");
		}
	} catch (Exception e) {
		e.printStackTrace();
	}
}

public void getData() {
	maxValue = 0.0;
	double temp;
	// String strType = String.valueOf(size) + "_" + String.valueOf(type);
	for (int i = 0; i < filenames.size(); i++) {
		String filepath = filenames.get(i).toString();
		String fileName = filepath.substring(filepath.lastIndexOf('/') + 1,
				filepath.length());// 提取下载图片的文件名
		Log.i("fileName", fileName);

		// if (!strType.equals(fileName
		// .substring(0, fileName.lastIndexOf('_')))) {
		// continue;
		// }
		String ImageVersion = fileName.substring(
				fileName.lastIndexOf('_') + 1, fileName.length());
		Log.i("ImageVersion", ImageVersion);
		String template_id_get = fileName.substring(
				fileName.lastIndexOf('_') - 1, fileName.lastIndexOf('_'));
		Log.i("template_id_get", template_id_get);
		template_id = Integer.parseInt(template_id_get);
		temp = Double.valueOf(ImageVersion.substring(0,
				ImageVersion.lastIndexOf('.')));

		arr = fileName.split("_");
		Log.i("arr", "" + arr[1]);// 画面类型
		arr_type.add(arr[1]);
		Log.i("template_id", "" + template_id);
		oName = arr[0]; // meiqi 、youshang 、jiayun
		Log.i("oName", "" + oName);
		if (maxValue < temp)
			maxValue = temp;
		String strType = oName + "_" + String.valueOf(oType) + "_"
				+ String.valueOf(oSize) + "_" + template_id + "_"
				+ maxValue;
		Log.i("strType", "" + strType);
		if (!strType
				.equals(fileName.substring(0, fileName.lastIndexOf('.')))) {
			maxValue = 1.0;
			continue;
		}else{
			break;
		}
		
	}
	if (!arr_type.contains(oType)) {
		template_id = 0;
		oName = "";
		maxValue = 1.0;
	}
	Log.i("template_id", "" + template_id);
}

AndroidManifest.xml
添加：

<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.CAMERA"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.FLASHLIGHT" />
<!-- 在SDCard中创建与删除文件权限 -->   
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>   

<!-- 往SDCard写入数据权限 -->   
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> 
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> 
<uses-sdk android:minSdkVersion="7"></uses-sdk>