Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import static android.os.Environment.MEDIA_MOUNTED;
import java.io.File;
import java.io.IOException;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.Environment;
import android.util.Log;

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

    public static File getCacheDirectory(Context context, boolean preferExternal, String dirName) {
        File appCacheDir = null;
        if (preferExternal && MEDIA_MOUNTED.equals(Environment.getExternalStorageState())
                && hasExternalStoragePermission(context)) {
            appCacheDir = getExternalCacheDir(context, dirName);
        }
        if (appCacheDir == null) {
            appCacheDir = context.getCacheDir();
        }
        if (appCacheDir == null) {
            String cacheDirPath = "/data/data/" + context.getPackageName() + "/cache/";
            Log.w("Can't define system cache directory! '%s' will be used.", cacheDirPath);
            appCacheDir = new File(cacheDirPath);
        }
        return appCacheDir;
    }

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

    private static File getExternalCacheDir(Context context, String dirName) {
        File dataDir = new File(new File(Environment.getExternalStorageDirectory(), "Android"), "data");
        File appCacheDir2 = new File(new File(dataDir, context.getPackageName()), "cache");
        File appCacheDir = new File(appCacheDir2, dirName);
        if (!appCacheDir.exists()) {
            if (!appCacheDir.mkdirs()) {
                Log.w(TAG, "Unable to create external cache directory");
                return null;
            }
            try {
                new File(appCacheDir, ".nomedia").createNewFile();
            } catch (IOException e) {
                Log.i(TAG, "Can't create \".nomedia\" file in application external cache directory");
            }
        }
        return appCacheDir;
    }
}