Android permission management tool class

package cc.vv.btongbaselibrary.util;

import android.Manifest;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;

/**
 * 权限处理
 * Created by nanPengFei on 2016/12/21 14:11.
 */
public class LKPermissionUtil {
    private static LKPermissionUtil mInstance;

    private LKPermissionUtil() {
    }

    public static LKPermissionUtil getInstance() {
        if (null == mInstance) {
            synchronized (LKPermissionUtil.class) {
                if (null == mInstance) {
                    mInstance = new LKPermissionUtil(); 
                } 
            } 
        } 
        return mInstance; 
    } 


    /** 
     * Determine whether you have a certain permission, the first time you don't have it, a pop-up window will ask, after the user refuses, 
     * Please go to the corresponding Activity to rewrite onRequestPermissionsResult to judge requestCode value to prompt accordingly 
     * 
     * @param activity 
     * @param permission 
     * @param requestCode 
     * @return 
     */ 
    private boolean requestPermission(Activity activity, String[] permission, int requestCode) { 
        boolean isHasPermission = false;//No permission by default 
        if (ContextCompat.checkSelfPermission(activity, permission[0]) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(activity, permission, requestCode); 
        } else { 
            isHasPermission = true; 
        } 
        return isHasPermission; 
    } 

    /*About permission application*/ 
    public static final int REQUEST_PERMISSION_CAMERA = 501;//Camera permission application 
    public static final int REQUEST_PERMISSION_SD = 502 ;//SD card permission application 
    public static final int REQUEST_PERMISSION_AUDIO = 503;//Recording permission application 
    public static final int REQUEST_PERMISSION_LOCATION = 504;//Location permission application 
    public static final int REQUEST_PERMISSION_FILESYSTEMS = 505;//Mount SD card permission application 
    public static final int REQUEST_PERMISSION_CONTACTS = 506;//Get the read phone address book 
    //Get the permission to make calls
    public static final int REQUEST_PERMISSION_CALL = 507;

    /**
     * 相机权限申请
     *
     * @param activity
     * @return
     */
    public boolean requestCamera(Activity activity) {
        return requestPermission(activity,
                new String[]{Manifest.permission.CAMERA
                }, REQUEST_PERMISSION_CAMERA);
    }

    /**
     * SD卡权限申请
     *
     * @param activity
     * @return
     */
    public boolean requestSD(Activity activity) {
        return requestPermission(activity,
                new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE,
                        Manifest.permission.READ_EXTERNAL_STORAGE
                }, REQUEST_PERMISSION_SD);
    }

    /**
     * 录音权限申请
     *
     * @param activity
     * @return
     */
    public boolean requestAudio(Activity activity) {
        return requestPermission(activity,
                new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE,
                        Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.RECORD_AUDIO
                }, REQUEST_PERMISSION_AUDIO);
    }

    /**
     * 定位权限申请
     *
     * @param activity
     * @return
     */
    public boolean requestLocation(Activity activity) {
        return requestPermission(activity,
                new String[]{Manifest.permission.ACCESS_COARSE_LOCATION,
                        Manifest.permission.ACCESS_FINE_LOCATION
                }, REQUEST_PERMISSION_LOCATION);
    }

    /**
     * 联系人权限申请
     *
     * @param activity
     * @return
     */
    public boolean requestContacts(Activity activity) {
        return requestPermission(activity,
                new String[]{Manifest.permission.READ_CONTACTS,
                        Manifest.permission.WRITE_CONTACTS
                }, REQUEST_PERMISSION_CONTACTS);
    } 

    /** 
     * Mount SD card permission request 
     * 
     * @param activity 
     * @return 
     */ 
    public boolean requestFilesystems(Activity activity) { 
        return requestPermission(activity, 
                new String[]{Manifest.permission.MOUNT_UNMOUNT_FILESYSTEMS 
                }, REQUEST_PERMISSION_FILESYSTEMS); 
    } 

    /** 
     * Get the permission to make calls 
     */ 
    public boolean requestCallPhone(Activity activity) { 
        return requestPermission(activity, new String[]{Manifest.permission.CALL_PHONE}, 
                REQUEST_PERMISSION_CALL); 
    } 

    /** 
     * Request all permissions provided 
     *
     * @param activity
     */
    public void requestAll(Activity activity) {
        requestPermission(activity,
                new String[]{Manifest.permission.CAMERA
                        , Manifest.permission.WRITE_EXTERNAL_STORAGE,
                        Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE,
                        Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.RECORD_AUDIO,
                        Manifest.permission.ACCESS_COARSE_LOCATION,
                        Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.READ_CONTACTS,
                        Manifest.permission.WRITE_CONTACTS, Manifest.permission.MOUNT_UNMOUNT_FILESYSTEMS,
                        Manifest.permission.CALL_PHONE},
                REQUEST_PERMISSION_CAMERA);
    }
}