FileUtils.java

package com.ydl.ydlcommon.utils;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.support.v4.content.FileProvider;
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;

/**
 * 文件保存
 *
 * @author xiongyu
 */
public class FileUtils {
    private static final String TAG = "FileUtils";
    /**
     * sd卡的根目录
     */
    private static String mSdRootPath = Environment.getExternalStorageDirectory().getPath();
    /**
     * 手机的缓存根目录
     */
    private static String mDataRootPath = null;
    /**
     * 保存Image的目录名
     */
    private final static String FOLDER_NAME = "/yidianling";

    private static Context mContext;


    public FileUtils(Context context) {
        mDataRootPath = context.getCacheDir().getPath();
        mContext = context;
    }


    /**
     * 获取储存Image的目录
     *
     * @return
     */
    public static String getStorageDirectory() {
        return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED) ?
                mSdRootPath + FOLDER_NAME : mDataRootPath + FOLDER_NAME;
    }

    /**
     * 获取SD卡目录
     *
     * @return
     */
    public static String getSDDirectory() {
        return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED) ?
                mSdRootPath : mDataRootPath;
    }

    public File SaveBitmap(Bitmap mBitmap, String path) throws IOException {
        File file;
        isFilleExit(path);
        File f = new File(path);
        try {
            f.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
        FileOutputStream fOut = null;
        try {
            fOut = new FileOutputStream(f);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        mBitmap.compress(Bitmap.CompressFormat.PNG, 100, fOut);
        fOut.flush();
        fOut.close();
        file=new File(path);
        return file;
    }

    public void SaveBitmap(Bitmap mBitmap, String path, String filen_name) throws IOException {
        isFilleExit(path);
        File f = new File(path + filen_name);
        try {
            f.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
        FileOutputStream fOut = null;
        try {
            fOut = new FileOutputStream(f);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        mBitmap.compress(Bitmap.CompressFormat.PNG, 100, fOut);
        fOut.flush();
        fOut.close();
    }


    /**
     * 从手机或者sd卡获取Bitmap
     *
     * @param fileName
     * @return
     */
    public Bitmap getBitmap(String fileName) {
        return BitmapFactory.decodeFile(getStorageDirectory() + File.separator + fileName);
    }

    /**
     * 判断文件是否存在
     *
     * @param fileName
     * @return
     */
    public boolean isFileExists(String fileName) {
        return new File(getStorageDirectory() + File.separator + fileName).exists();
    }

    /**
     * 获取文件的大小
     *
     * @param fileName
     * @return
     */
    public long getFileSize(String fileName) {
        return new File(getStorageDirectory() + File.separator + fileName).length();
    }


    /**
     * 删除SD卡或者手机的缓存图片和目录
     */
    public void deleteFile() {
        File dirFile = new File(getStorageDirectory());
        if (!dirFile.exists()) {
            return;
        }
        if (dirFile.isDirectory()) {
            String[] children = dirFile.list();
            for (int i = 0; i < children.length; i++) {
                new File(dirFile, children[i]).delete();
            }
        }

        dirFile.delete();
    }

    /**
     * 判断该路径的文件是否存在
     *
     * @param path
     * @return
     */
    public static boolean isFilleExit(String path) {
        Boolean isexit = false;
        File f = new File(path);
        if (f.exists()) {
            isexit = true;
        } else {
            isexit = false;
            if (!f.exists()) {
                try {
                    f.mkdirs();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
        return isexit;
    }

    /**
     * 删除该目录下所有文件
     * @param root
     */
    public  void deleteAllFiles(File root) {
        File files[] = root.listFiles();
        if (files != null)
            for (File f : files) {
                if (f.isDirectory()) { // 判断是否为文件夹
                    deleteAllFiles(f);
                    try {
                        f.delete();
                    } catch (Exception e) {
                    }
                } else {
                    if (f.exists()) { // 判断是否存在
                        deleteAllFiles(f);
                        try {
                            f.delete();
                        } catch (Exception e) {
                        }
                    }
                }
            }
    }

    /**
     * File TO Uri
     * @param context
     * @param imageFile
     * @return
     */
    public Uri getImageContentUri(Context context, File imageFile) {
        String filePath = imageFile.getAbsolutePath();
        Cursor cursor = context.getContentResolver().query(
                MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                new String[] { MediaStore.Images.Media._ID },
                MediaStore.Images.Media.DATA + "=? ",
                new String[] { filePath }, null);

        if (cursor != null && cursor.moveToFirst()) {
            int id = cursor.getInt(cursor
                    .getColumnIndex(MediaStore.MediaColumns._ID));
            Uri baseUri = Uri.parse("content://media/external/images/media");
            return Uri.withAppendedPath(baseUri, "" + id);
        } else {
            if (imageFile.exists()) {
                ContentValues values = new ContentValues();
                values.put(MediaStore.Images.Media.DATA, filePath);
                return context.getContentResolver().insert(
                        MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
            } else {
                return null;
            }
        }
    }

    /**
     * 打开文件
     * 兼容7.0
     *
     * @param context     activity
     * @param file        File
     * @param contentType 文件类型如：文本（text/html）
     *                    当手机中没有一个app可以打开file时会抛ActivityNotFoundException
     */
    public static void startActionFile(Context context, File file, String contentType) throws ActivityNotFoundException {
        if (context == null) {
            return;
        }
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.addCategory(Intent.CATEGORY_DEFAULT);
        intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
        intent.setFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);//增加读写权限
        intent.setDataAndType(getUriForFile(context, file), contentType);
        if (!(context instanceof Activity)) {
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        }
        context.startActivity(intent);
    }

    /**
     * 打开相机
     * 兼容7.0
     *
     * @param activity    Activity
     * @param file        File
     * @param requestCode result requestCode
     */
    public static void startActionCapture(Activity activity, File file, int requestCode) {
        if (activity == null) {
            return;
        }
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, getUriForFile(activity, file));
        activity.startActivityForResult(intent, requestCode);
    }


    public static Uri getUriForFile(Context context, File file) {
        if (context == null || file == null) {
            throw new NullPointerException();
        }
        Uri uri;
        if (Build.VERSION.SDK_INT >= 24) {
            uri = FileProvider.getUriForFile(context.getApplicationContext(), "com.honjane.providerdemo.fileprovider", file);
        } else {
            uri = Uri.fromFile(file);
        }
        return uri;
    }

    /**
     * 图片的缩放方法
     *
     * @param bitmap：源图片资源
     * @param maxSize：     图片允许最大空间 单位
     *                     :KB
     * @return
     */

    public static Bitmap  getZoomImage(Bitmap bitmap, double maxSize) {
        if (null == bitmap) {
            return null;
        }
        if (bitmap.isRecycled()) {
            return null;
        }

        // 单位：从 Byte 换算成 KB
        double currentSize = bitmapToByteArray(bitmap, false).length / 1024;
        // 判断bitmap占用空间是否大于允许最大空间,如果大于则压缩,小于则不压缩
        while (currentSize > maxSize) {
            // 计算bitmap的大小是maxSize的多少倍
            double multiple = currentSize / maxSize;
            // 开始压缩：将宽带和高度压缩掉对应的平方根倍
            // 1.保持新的宽度和高度，与bitmap原来的宽高比率一致
            // 2.压缩后达到了最大大小对应的新bitmap，显示效果最好
            bitmap = getZoomImage(bitmap, bitmap.getWidth() / Math.sqrt(multiple), bitmap.getHeight() / Math.sqrt(multiple));
            currentSize = bitmapToByteArray(bitmap, false).length / 1024;
        }
        return bitmap;
    }

    /**
     * bitmap转换成byte数组
     *
     * @param bitmap
     * @param needRecycle
     * @return
     */
    public static byte[] bitmapToByteArray(Bitmap bitmap, boolean needRecycle) {
        if (null == bitmap) {
            return null;
        }
        if (bitmap.isRecycled()) {
            return null;
        }

        ByteArrayOutputStream output = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.PNG, 100, output);
        if (needRecycle) {
            bitmap.recycle();
        }

        byte[] result = output.toByteArray();
        try {
            output.close();
        } catch (Exception e) {
            Log.e("xyutest", e.toString());
        }
        return result;
    }

    /**
     * 图片的缩放方法
     *
     * @param orgBitmap ：源图片资源
     * @param newWidth  ：缩放后宽度
     * @param newHeight ：缩放后高度
     * @return
     */
    public static Bitmap getZoomImage(Bitmap orgBitmap, double newWidth, double newHeight) {
        if (null == orgBitmap) {
            return null;
        }
        if (orgBitmap.isRecycled()) {
            return null;
        }
        if (newWidth <= 0 || newHeight <= 0) {
            return null;
        }

        // 获取图片的宽和高
        float width = orgBitmap.getWidth();
        float height = orgBitmap.getHeight();
        // 创建操作图片的matrix对象
        Matrix matrix = new Matrix();
        // 计算宽高缩放率
        float scaleWidth = ((float) newWidth) / width;
        float scaleHeight = ((float) newHeight) / height;
        // 缩放图片动作
        matrix.postScale(scaleWidth, scaleHeight);
        Bitmap bitmap = Bitmap.createBitmap(orgBitmap, 0, 0, (int) width, (int) height, matrix, true);
        return bitmap;
    }


    /**
     * 通过uri获取绝对路径
     * @param context
     * @param uri
     * @return
     */
    @SuppressLint("NewApi")
    public static String getPathByUri4kitkat(final Context context, final Uri uri) {
        final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
        // DocumentProvider
        if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
            if (Utils.isExternalStorageDocument(uri)) {// ExternalStorageProvider
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                final String type = split[0];
                if ("primary".equalsIgnoreCase(type)) {
                    return Environment.getExternalStorageDirectory() + "/" + split[1];
                }
            } else if (Utils.isDownloadsDocument(uri)) {// DownloadsProvider
                final String id = DocumentsContract.getDocumentId(uri);
                final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"),
                        Long.valueOf(id));
                return Utils.getDataColumn(context, contentUri, null, null);
            } else if (Utils.isMediaDocument(uri)) {// MediaProvider
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                final String type = split[0];
                Uri contentUri = null;
                if ("image".equals(type)) {
                    contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
                } else if ("video".equals(type)) {
                    contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
                } else if ("audio".equals(type)) {
                    contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
                }
                final String selection = "_id=?";
                final String[] selectionArgs = new String[] { split[1] };
                return Utils.getDataColumn(context, contentUri, selection, selectionArgs);
            }
        } else if ("content".equalsIgnoreCase(uri.getScheme())) {// MediaStore
            // (and
            // general)
            return Utils.getDataColumn(context, uri, null, null);
        } else if ("file".equalsIgnoreCase(uri.getScheme())) {// File
            return uri.getPath();
        }
        return null;
    }

    /**
     * 复制单个文件
     * @param oldPath String 原文件路径 如：c:/fqf.txt
     * @param newPath String 复制后路径 如：f:/fqf.txt
     * @return boolean
     */
    public static  void copyFile(String oldPath, String newPath) throws Exception {
            int bytesum = 0;
            int byteread = 0;
            File oldfile = new File(oldPath);
            if (!oldfile.exists()) { //文件不存在时
                InputStream inStream = new FileInputStream(oldPath); //读入原文件
                FileOutputStream fs = new FileOutputStream(newPath);
                byte[] buffer = new byte[1444];
                int length;
                while ( (byteread = inStream.read(buffer)) != -1) {
                    bytesum += byteread; //字节数 文件大小
                    fs.write(buffer, 0, byteread);
                }
                inStream.close();

            }
        }


}