FileUtils.java
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package com.cnlive.media.utils;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.MediaStore;
import android.text.TextUtils;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.text.DecimalFormat;
import java.util.Locale;
import static android.os.Environment.MEDIA_MOUNTED;
/**
* 文件操作类
* Created by Nereo on 2015/4/8.
*/
public class FileUtils {
private static final String JPEG_FILE_PREFIX = "IMG_";
private static final String JPEG_FILE_SUFFIX = ".jpg";
public static File createTmpFile(Context context) throws IOException {
File dir = null;
if (TextUtils.equals(Environment.getExternalStorageState(), Environment.MEDIA_MOUNTED)) {
dir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);
if (!dir.exists()) {
dir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM + "/Camera");
if (!dir.exists()) {
dir = getCacheDirectory(context, true);
}
}
} else {
dir = getCacheDirectory(context, true);
}
return File.createTempFile(JPEG_FILE_PREFIX, JPEG_FILE_SUFFIX, dir);
}
private static final String EXTERNAL_STORAGE_PERMISSION = "android.permission.WRITE_EXTERNAL_STORAGE";
/**
* Returns application cache directory. Cache directory will be created on SD card
* <i>("/Android/data/[app_package_name]/cache")</i> if card is mounted and app has appropriate permission. Else -
* Android defines cache directory on device's file system.
*
* @param context Application context
* @return Cache {@link File directory}.<br />
* <b>NOTE:</b> Can be null in some unpredictable cases (if SD card is unmounted and
* {@link Context#getCacheDir() Context.getCacheDir()} returns null).
*/
public static File getCacheDirectory(Context context) {
return getCacheDirectory(context, true);
}
/**
* Returns application cache directory. Cache directory will be created on SD card
* <i>("/Android/data/[app_package_name]/cache")</i> (if card is mounted and app has appropriate permission) or
* on device's file system depending incoming parameters.
*
* @param context Application context
* @param preferExternal Whether prefer external location for cache
* @return Cache {@link File directory}.<br />
* <b>NOTE:</b> Can be null in some unpredictable cases (if SD card is unmounted and
* {@link Context#getCacheDir() Context.getCacheDir()} returns null).
*/
public static File getCacheDirectory(Context context, boolean preferExternal) {
File appCacheDir = null;
String externalStorageState;
try {
externalStorageState = Environment.getExternalStorageState();
} catch (NullPointerException e) { // (sh)it happens (Issue #660)
externalStorageState = "";
} catch (IncompatibleClassChangeError e) { // (sh)it happens too (Issue #989)
externalStorageState = "";
}
if (preferExternal && MEDIA_MOUNTED.equals(externalStorageState) && hasExternalStoragePermission(context)) {
appCacheDir = getExternalCacheDir(context);
}
if (appCacheDir == null) {
appCacheDir = context.getCacheDir();
}
if (appCacheDir == null) {
String cacheDirPath = "/data/data/" + context.getPackageName() + "/cache/";
appCacheDir = new File(cacheDirPath);
}
return appCacheDir;
}
/**
* Returns individual application cache directory (for only image caching from ImageLoader). Cache directory will be
* created on SD card <i>("/Android/data/[app_package_name]/cache/uil-images")</i> if card is mounted and app has
* appropriate permission. Else - Android defines cache directory on device's file system.
*
* @param context Application context
* @param cacheDir Cache directory path (e.g.: "AppCacheDir", "AppDir/cache/images")
* @return Cache {@link File directory}
*/
public static File getIndividualCacheDirectory(Context context, String cacheDir) {
File appCacheDir = getCacheDirectory(context);
File individualCacheDir = new File(appCacheDir, cacheDir);
if (!individualCacheDir.exists()) {
if (!individualCacheDir.mkdir()) {
individualCacheDir = appCacheDir;
}
}
return individualCacheDir;
}
private static File getExternalCacheDir(Context context) {
File dataDir = new File(new File((Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q ? context.getExternalFilesDir("") : Environment.getExternalStorageDirectory()), "Android"), "data");
File appCacheDir = new File(new File(dataDir, context.getPackageName()), "cache");
if (!appCacheDir.exists()) {
if (!appCacheDir.mkdirs()) {
return null;
}
try {
new File(appCacheDir, ".nomedia").createNewFile();
} catch (IOException e) {
}
}
return appCacheDir;
}
private static final long MB = 1024 * 1024;
public static String getSizeByUnit(double size) {
if (size == 0) {
return "0K";
}
if (size >= MB) {
double sizeInM = size / MB;
return String.format(Locale.getDefault(), "%.1f", sizeInM) + "M";
}
double sizeInK = size / 1024;
return String.format(Locale.getDefault(), "%.1f", sizeInK) + "K";
}
private static boolean hasExternalStoragePermission(Context context) {
if (Build.VERSION.SDK_INT >= 33) return true;
int perm = context.checkCallingOrSelfPermission(EXTERNAL_STORAGE_PERMISSION);
return perm == PackageManager.PERMISSION_GRANTED;
}
public static String fileSize(long size) {
if (size <= 0) return "0";
final String[] units = new String[]{"B", "kB", "MB", "GB", "TB"};
int digitGroups = (int) (Math.log10(size) / Math.log10(1024));
return new DecimalFormat("#,##0.#").format(size / Math.pow(1024, digitGroups)) + " " + units[digitGroups];
}
public static String saveBitmap(Context context,String path, Bitmap b) {
long dataTake = System.currentTimeMillis();
String jpegName = path + File.separator + "picture_" + dataTake + ".jpg";
try {
FileOutputStream fout = new FileOutputStream(jpegName);
BufferedOutputStream bos = new BufferedOutputStream(fout);
b.compress(Bitmap.CompressFormat.JPEG, 100, bos);
bos.flush();
bos.close();
File newFile= new File(jpegName);
if (newFile != null) {
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.DATA, newFile.getAbsolutePath());
values.put(MediaStore.Images.Media.MIME_TYPE, "image/jpeg");
values.put(MediaStore.Images.ImageColumns.DATE_TAKEN, System.currentTimeMillis() + "");
context.getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
// 其次把文件插入到系统图库
String uri = MediaStore.Images.Media.insertImage(context.getContentResolver(),
newFile.getAbsolutePath(), newFile.getName(), null);
context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + newFile.getAbsolutePath())));
}
return jpegName;
} catch (Exception e) {
e.printStackTrace();
return "";
}
}
/**
* 删除文件
*
* @param file 文件
* @return {@code true}: 删除成功<br>{@code false}: 删除失败
*/
public static boolean deleteFile(final File file) {
return file != null && (!file.exists() || file.isFile() && file.delete());
}
public static void copyFile(String oldPath, String newPath) {
try {
int bytesum = 0;
int byteread = 0;
File oldfile = new File(oldPath);
if (oldfile.exists()) { //文件存在时
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
System.out.println(bytesum);
fs.write(buffer, 0, byteread);
}
inStream.close();
}
} catch (Exception e) {
System.out.println("复制单个文件操作出错");
e.printStackTrace();
}
}
}