package me.nereo.multi_image_selector.utils;
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import android.content.Context;
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import android.content.pm.PackageManager;
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import android.os.Environment;
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import android.text.TextUtils;
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import java.io.File;
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import java.io.IOException;
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import static android.os.Environment.MEDIA_MOUNTED;
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/**
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* 文件操作类
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* Created by Nereo on 2015/4/8.
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*/
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public class FileUtils {
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private static final String JPEG_FILE_PREFIX = "IMG_";
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private static final String JPEG_FILE_SUFFIX = ".jpg";
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public static File createTmpFile(Context context) throws IOException{
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File dir = null;
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if(TextUtils.equals(Environment.getExternalStorageState(), Environment.MEDIA_MOUNTED)) {
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dir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);
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if (!dir.exists()) {
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dir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM + "/Camera");
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if (!dir.exists()) {
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dir = getCacheDirectory(context, true);
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}
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}
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}else{
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dir = getCacheDirectory(context, true);
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}
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return File.createTempFile(JPEG_FILE_PREFIX, JPEG_FILE_SUFFIX, dir);
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}
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private static final String EXTERNAL_STORAGE_PERMISSION = "android.permission.WRITE_EXTERNAL_STORAGE";
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/**
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* Returns application cache directory. Cache directory will be created on SD card
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* <i>("/Android/data/[app_package_name]/cache")</i> if card is mounted and app has appropriate permission. Else -
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* Android defines cache directory on device's file system.
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*
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* @param context Application context
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* @return Cache {@link File directory}.<br />
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* <b>NOTE:</b> Can be null in some unpredictable cases (if SD card is unmounted and
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* {@link Context#getCacheDir() Context.getCacheDir()} returns null).
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*/
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public static File getCacheDirectory(Context context) {
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return getCacheDirectory(context, true);
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}
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/**
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* Returns application cache directory. Cache directory will be created on SD card
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* <i>("/Android/data/[app_package_name]/cache")</i> (if card is mounted and app has appropriate permission) or
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* on device's file system depending incoming parameters.
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*
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* @param context Application context
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* @param preferExternal Whether prefer external location for cache
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* @return Cache {@link File directory}.<br />
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* <b>NOTE:</b> Can be null in some unpredictable cases (if SD card is unmounted and
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* {@link Context#getCacheDir() Context.getCacheDir()} returns null).
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*/
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public static File getCacheDirectory(Context context, boolean preferExternal) {
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File appCacheDir = null;
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String externalStorageState;
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try {
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externalStorageState = Environment.getExternalStorageState();
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} catch (NullPointerException e) { // (sh)it happens (Issue #660)
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externalStorageState = "";
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} catch (IncompatibleClassChangeError e) { // (sh)it happens too (Issue #989)
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externalStorageState = "";
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}
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if (preferExternal && MEDIA_MOUNTED.equals(externalStorageState) && hasExternalStoragePermission(context)) {
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appCacheDir = getExternalCacheDir(context);
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}
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if (appCacheDir == null) {
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appCacheDir = context.getCacheDir();
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}
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if (appCacheDir == null) {
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String cacheDirPath = "/data/data/" + context.getPackageName() + "/cache/";
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appCacheDir = new File(cacheDirPath);
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}
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return appCacheDir;
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}
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/**
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* Returns individual application cache directory (for only image caching from ImageLoader). Cache directory will be
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* created on SD card <i>("/Android/data/[app_package_name]/cache/uil-images")</i> if card is mounted and app has
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* appropriate permission. Else - Android defines cache directory on device's file system.
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*
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* @param context Application context
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* @param cacheDir Cache directory path (e.g.: "AppCacheDir", "AppDir/cache/images")
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* @return Cache {@link File directory}
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*/
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public static File getIndividualCacheDirectory(Context context, String cacheDir) {
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File appCacheDir = getCacheDirectory(context);
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File individualCacheDir = new File(appCacheDir, cacheDir);
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if (!individualCacheDir.exists()) {
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if (!individualCacheDir.mkdir()) {
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individualCacheDir = appCacheDir;
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}
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}
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return individualCacheDir;
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}
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private static File getExternalCacheDir(Context context) {
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File dataDir = new File(new File(Environment.getExternalStorageDirectory(), "Android"), "data");
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File appCacheDir = new File(new File(dataDir, context.getPackageName()), "cache");
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if (!appCacheDir.exists()) {
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if (!appCacheDir.mkdirs()) {
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return null;
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}
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try {
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new File(appCacheDir, ".nomedia").createNewFile();
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} catch (IOException e) {
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}
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}
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return appCacheDir;
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}
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private static boolean hasExternalStoragePermission(Context context) {
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int perm = context.checkCallingOrSelfPermission(EXTERNAL_STORAGE_PERMISSION);
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return perm == PackageManager.PERMISSION_GRANTED;
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}
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}
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