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SourceTree/SDCardUtils.java at develop · git-levo/SourceTree · GitHub

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package com.example.day0330_sdcard;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.io.OutputStream;

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.os.Environment;

import android.os.StatFs;

import android.util.Log;

public class SDCardUtils {

//判断SD卡是否挂载

public static boolean isSDCardMounted(){

//获取SD卡外部存储状态

if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {

return true;

}

return false;

}

//获取SD卡的根目录

public static String getSDCardBaseDir(){

if (isSDCardMounted()) {

File dir = Environment.getExternalStorageDirectory();

return dir.getAbsolutePath();

}

return null;

}

//获取SD卡全部内存空间大小

public static long getSDCardSize(){

if (isSDCardMounted()) {

String dir = getSDCardBaseDir();

//StatFs是从C语言引过来的

StatFs statFs = new StatFs(dir);

long blockCount = statFs.getBlockCountLong();//有多少块

long blockSize = statFs.getBlockSizeLong();//每块有多大

return blockCount*blockSize/1024/1024; //总大小

}

return 0;

}

//获取SD卡空闲空间大小(有多少空间还没被占用)

public static long getSDCardFreeSize(){

if (isSDCardMounted()) {

String dir = getSDCardBaseDir();

//StatFs是从C语言引过来的

StatFs statFs = new StatFs(dir);

long freeBlockCount = statFs.getFreeBlocksLong();//有多少块

long blockSize = statFs.getBlockSizeLong();//每块有多大

return freeBlockCount*blockSize/1024/1024; //总大小

}

return 0;

}

//获取SD卡可用剩余空间大小(还剩下多少空间)

public static long getSDCardAvailableSize(){

if (isSDCardMounted()) {

String dir = getSDCardBaseDir();

//StatFs是从C语言引过来的

StatFs statFs = new StatFs(dir);

long availableBlockCount = statFs.getAvailableBlocksLong();//有多少块

long blockSize = statFs.getBlockSizeLong();//每块有多大

return availableBlockCount*blockSize/1024/1024; //总大小

}

return 0;

}

//往SD卡九大目录保存文件

public static boolean saveData2SDCardpublicDir(byte[] bys,String type,String filename){

if (isSDCardMounted()) {

//获取SD卡的根目录

String baseDir = getSDCardBaseDir();

//获取文件的路径

String file = baseDir+File.separator+type+File.separator+filename;

try {

OutputStream os = new FileOutputStream(file);

os.write(bys);

os.close();

return true;

} catch (Exception e){

e.printStackTrace();

}

}

return false;

}

//往SDCard公有目录下保存文件 (九大公有目录中的一个，具体由type指定)

public static boolean saveData2SDCardCustomDir(byte[] bys,String dir,String filename){

if (isSDCardMounted()) {

//获取SD卡的根目录

String baseDir = getSDCardBaseDir();

String path =baseDir+File.separator+dir;

//获取自建文件夹的路径

File file1 = new File(path);

//判断文件夹是否存在，不存在的话就得先创建

if (!file1.exists()) {

file1.mkdir();

}

//获取文件的路径

String file = baseDir+File.separator+dir+File.separator+filename;

try {

OutputStream os = new FileOutputStream(file);

os.write(bys);

os.close();

return true;

} catch (Exception e) {

e.printStackTrace();

}

}

return false;

}

//往SDCard的私有File目录下保存文件

public static boolean saveData2SDCardPrivateFileDir(byte[] data, String type, String filename, Context context){

if (isSDCardMounted()) {

File path = context.getExternalFilesDir(type);

if (!path.exists()) {

path.mkdir();

}

String file = path.getAbsolutePath()+File.separator+filename;

try {

OutputStream os = new FileOutputStream(file);

os.write(data);

os.close();

return true;

} catch (Exception e) {

e.printStackTrace();

}

}

return false;

}

//往SDCard的私有Cache目录下保存文件

public static boolean saveData2SDCardPrivateCacheDir(byte[] data, String filename, Context context){

if (isSDCardMounted()) {

File path = context.getExternalCacheDir();

if (!path.exists()) {

path.mkdir();

}

String file = path.getAbsolutePath()+File.separator+filename;

try {

OutputStream os = new FileOutputStream(file);

os.write(data);

os.close();

return true;

} catch (Exception e) {

e.printStackTrace();

}

}

return false;

}

//往SDCard的私有Cache目录下保存图像

public static boolean saveBitmap2SDCardPrivateCacheDir(Bitmap bitmap, String filename, Context context){

if (isSDCardMounted()) {

File path = context.getExternalCacheDir();

if (!path.exists()) {

path.mkdir();

}

String file = path.getAbsolutePath()+File.separator+filename;

try {

OutputStream os = new FileOutputStream(file);

//把图片转成byte[]

//os.write();

//判断图片格式

if(filename.endsWith(".JPG")||filename.endsWith(".jap")){

bitmap.compress(Bitmap.CompressFormat.JPEG, 100, os);

}else if(filename.endsWith(".PNG")||filename.endsWith(".png")){

bitmap.compress(Bitmap.CompressFormat.PNG, 100, os);

}

os.close();

return true;

} catch (Exception e) {

e.printStackTrace();

}

}

return false;

}

//从SDCard读取指定文件

public static byte[] loadFileFromSDCard(String filePath){

if (isSDCardMounted()) {

String path = getSDCardBaseDir();

String file = path+File.separator+filePath;

try {

InputStream is = new FileInputStream(file);

ByteArrayOutputStream baos = new ByteArrayOutputStream();

byte[] bys = new byte[1024];

int len = 0;

while((len=is.read(bys))!=-1){

baos.write(bys, 0, len);

}

return baos.toByteArray();

} catch (Exception e) {

e.printStackTrace();

}

}

return null;

}

//从SDCard读取Bitmap并返回

public static Bitmap loadBitmapFromSDCard(String filePath){

if (isSDCardMounted()) {

//filePath就是全路径

try {

InputStream is = new FileInputStream(filePath);

ByteArrayOutputStream baos = new ByteArrayOutputStream();

byte[] bys = new byte[1024];

int len = 0;

while((len=is.read(bys))!=-1){

baos.write(bys, 0, len);

}

byte[] data = baos.toByteArray();

Bitmap bitmap =BitmapFactory.decodeByteArray(data, 0, data.length);

return bitmap;

} catch (Exception e) {

e.printStackTrace();

}

}

return null;

}

//获取SD卡公有目录路径

public static String getSDCardPublicDir(String type){

if (isSDCardMounted()) {

File dir = Environment.getExternalStoragePublicDirectory(type);

return dir.getAbsolutePath();

}

return null;

}

//获取SDCard私有Cache目录路径

public static String getSDCardPrivateCacheDir(Context context){

if (isSDCardMounted()) {

File dir = context.getExternalCacheDir();

return dir.getAbsolutePath();

}

return null;

}

//获取SDCard私有File目录路径

public static String getSDCardPrivateFilesDir(Context context, String type){

if (isSDCardMounted()) {

File dir =context.getExternalFilesDir(type);

return dir.getAbsolutePath();

}

return null;

}

//判断一个文件是否存在

public static boolean isFileExists(String filePath){

if (isSDCardMounted()) {

File file = new File(filePath);

return file.exists();

}

return false;

}

//删除一个文件

public static boolean removeFileFromSDCard(String filePath){

if (isSDCardMounted()) {

File file =new File(filePath);

return file.delete();

}

return false;

}

}

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