FileUtil.java

/*
 * 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 my.home.common.util;

import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Environment;
import android.util.Base64;
import android.util.Base64OutputStream;
import android.util.Log;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.channels.FileChannel;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

/**
 * Created by legendmohe on 15/5/7.
 */
public class FileUtil {
    public static final String TAG = "FileUtil";

    public static boolean isExternalStorageWritable() {
        return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);
    }

    public static File getPictureStorageDir(String dirName) {
        File file = new File(Environment.getExternalStoragePublicDirectory(
                Environment.DIRECTORY_PICTURES), dirName);
        if (!file.exists() && !file.isDirectory() && file.mkdirs()) {
            Log.e(TAG, "Directory not created");
        }
        return file;
    }

    public static void copy(File src, File dst) throws IOException {
        FileChannel source = null;
        FileChannel destination = null;

        try {
            source = new FileInputStream(src).getChannel();
            destination = new FileOutputStream(dst).getChannel();
            destination.transferFrom(source, 0, source.size());
        } finally {
            if (source != null) {
                source.close();
            }
            if (destination != null) {
                destination.close();
            }
        }
    }

    public static String getUniquePrefix(String src, String suffix) {
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMdd'T'HHmmss", Locale.CHINA);
        String timeStamp = dateFormat.format(new Date());
        return src + "_" + timeStamp + "." + suffix;
    }

    public static String getPathFromUri(Context context, Uri uri) {
        String filePath = null;
        if (uri != null && "content".equals(uri.getScheme())) {
            Cursor cursor = context.getContentResolver().query(uri, new String[]{android.provider.MediaStore.Images.ImageColumns.DATA}, null, null, null);
            if (cursor != null) {
                cursor.moveToFirst();
                filePath = cursor.getString(0);
                cursor.close();
            }
        } else {
            filePath = uri.getPath();
        }
        return filePath;
    }

    public static String FileToBase64(File srcFile) {
        InputStream inputStream = null;//You can get an inputStream using any IO API
        try {
            inputStream = new FileInputStream(srcFile.getAbsolutePath());
        } catch (FileNotFoundException e) {
            return null;
        }
        byte[] buffer = new byte[8192];
        int bytesRead;
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        Base64OutputStream output64 = new Base64OutputStream(output, Base64.DEFAULT);
        try {
            while ((bytesRead = inputStream.read(buffer)) != -1) {
                output64.write(buffer, 0, bytesRead);
            }
        } catch (Exception e) {
            return null;
        }
        try {
            output64.close();
        } catch (IOException e) {
            return null;
        }

        return output.toString();
    }

    public static boolean isExternalStorageRemovable() {
        return Environment.isExternalStorageRemovable();
    }

    public static File getExternalCacheDir(Context context) {
        return context.getExternalCacheDir();
    }

    public static String getDiskCacheDir(Context context, String uniqueName) {
        return getDiskCacheDir(context) + File.separator + uniqueName;
    }

    public static String getDiskCacheDir(Context context) {
        // Check if media is mounted or storage is built-in, if so, try and use external cache dir
        // otherwise use internal cache dir
        final String cachePath =
                Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()) ||
                        !isExternalStorageRemovable() ? getExternalCacheDir(context).getPath() :
                        context.getCacheDir().getPath();

        return cachePath;
    }
}