Main.java Source code

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Here is the source code for Main.java

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//package com.java2s;
/*******************************************************************************
 * Copyright 2011-2014 Sergey Tarasevich
 *
 * 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.
 *******************************************************************************/

import android.content.Context;
import android.content.pm.PackageManager;
import android.os.Environment;
import java.io.File;

import static android.os.Environment.MEDIA_MOUNTED;

public class Main {
    private static final String EXTERNAL_STORAGE_PERMISSION = "android.permission.WRITE_EXTERNAL_STORAGE";

    /**
     * Returns specified application cache directory. Cache directory will be created on SD card by defined path 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 getOwnCacheDirectory(Context context, String cacheDir) {
        File appCacheDir = null;
        if (MEDIA_MOUNTED.equals(Environment.getExternalStorageState()) && hasExternalStoragePermission(context)) {
            appCacheDir = new File(Environment.getExternalStorageDirectory(), cacheDir);
        }
        if (appCacheDir == null || (!appCacheDir.exists() && !appCacheDir.mkdirs())) {
            appCacheDir = context.getCacheDir();
        }
        return appCacheDir;
    }

    /**
     * Returns specified application cache directory. Cache directory will be created on SD card by defined path 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 getOwnCacheDirectory(Context context, String cacheDir, boolean preferExternal) {
        File appCacheDir = null;
        if (preferExternal && MEDIA_MOUNTED.equals(Environment.getExternalStorageState())
                && hasExternalStoragePermission(context)) {
            appCacheDir = new File(Environment.getExternalStorageDirectory(), cacheDir);
        }
        if (appCacheDir == null || (!appCacheDir.exists() && !appCacheDir.mkdirs())) {
            appCacheDir = context.getCacheDir();
        }
        return appCacheDir;
    }

    private static boolean hasExternalStoragePermission(Context context) {
        int perm = context.checkCallingOrSelfPermission(EXTERNAL_STORAGE_PERMISSION);
        return perm == PackageManager.PERMISSION_GRANTED;
    }
}