Android Open Source - android-utils S D Card Utils

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License

The source code is released under:
Apache License
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Java Source Code

/**
 * Copyright 2014 Zhenguo Jin (jinzhenguo1990@gmail.com)
 *//from w  w  w .  ja  v a2  s . c o m
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.worthed.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

/**
 * SDcard??????
 *
 * @author jingle1267@163.com
 */
public class SDCardUtils {
    /**
     * Check the SD card
     *
     * @return ??????SDCard
     */
    public static boolean checkSDCardAvailable() {
        return android.os.Environment.getExternalStorageState().equals(
                android.os.Environment.MEDIA_MOUNTED);
    }

    /**
     * Check if the file is exists
     *
     * @param filePath ????
     * @param fileName ?????
     * @return ????????
     */
    public static boolean isFileExistsInSDCard(String filePath, String fileName) {
        boolean flag = false;
        if (checkSDCardAvailable()) {
            File file = new File(filePath, fileName);
            if (file.exists()) {
                flag = true;
            }
        }
        return flag;
    }

    /**
     * Write file to SD card
     *
     * @param filePath ????
     * @param filename ?????
     * @param content  ??
     * @return ??????????
     * @throws Exception
     */
    public static boolean saveFileToSDCard(String filePath, String filename,
                                           String content) throws Exception {
        boolean flag = false;
        if (checkSDCardAvailable()) {
            File dir = new File(filePath);
            if (!dir.exists()) {
                dir.mkdir();
            }
            File file = new File(filePath, filename);
            FileOutputStream outStream = new FileOutputStream(file);
            outStream.write(content.getBytes());
            outStream.close();
            flag = true;
        }
        return flag;
    }

    /**
     * Read file as stream from SD card
     *
     * @param fileName String PATH =
     *                 Environment.getExternalStorageDirectory().getAbsolutePath() +
     *                 "/dirName";
     * @return Byte??
     */
    public static byte[] readFileFromSDCard(String filePath, String fileName) {
        byte[] buffer = null;
        try {
            if (checkSDCardAvailable()) {
                String filePaht = filePath + "/" + fileName;
                FileInputStream fin = new FileInputStream(filePaht);
                int length = fin.available();
                buffer = new byte[length];
                fin.read(buffer);
                fin.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return buffer;
    }

    /**
     * Delete file
     *
     * @param filePath ????
     * @param fileName filePath =
     *                 android.os.Environment.getExternalStorageDirectory().getPath()
     * @return ?????????
     */
    public static boolean deleteSDFile(String filePath, String fileName) {
        File file = new File(filePath + "/" + fileName);
        if (!file.exists() || file.isDirectory())
            return false;
        return file.delete();
    }
}
Java Source Code List
