BaseFragment 运行时权限

/**
 * @ClassName: BaseFragment
 * @Description:
 * @author: Endeavor
 * @date: 2017/4/5
 */
public abstract class BaseFragment extends Fragment {

    private PermissionsResultListener mListener;

    private int mRequestCode;

    /**
     * 其他 fragment 继承 BaseFragment 调用 performRequestPermissions 方法
     *
     * @param desc        首次申请权限被拒绝后再次申请给用户的描述提示
     * @param permissions 要申请的权限数组
     * @param requestCode 申请标记值
     * @param listener    实现的接口
     */
    protected void performRequestPermissions(String desc, String[] permissions, int requestCode, PermissionsResultListener listener) {
        if (permissions == null || permissions.length == 0) return;
        mRequestCode = requestCode;
        mListener = listener;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            List<String> mPermissionList = checkPermission(permissions);
            if (!mPermissionList.isEmpty()) {// 检查是否声明了权限
                String[] temp = mPermissionList.toArray(new String[mPermissionList.size()]);//将List转为数组
                requestEachPermissions(desc, temp, requestCode);
            } else {
                // 已经申请权限
                if (mListener != null) {
                    mListener.onPermissionGranted();
                }
            }
        } else {
            if (mListener != null) {
                mListener.onPermissionGranted();
            }
        }
    }

    /**
     * 申请权限前判断是否需要声明
     *
     * @param desc
     * @param permissions
     * @param requestCode
     */
    private void requestEachPermissions(String desc, String[] permissions, int requestCode) {

            if (showRationale(permissions)) {// 需要再次声明
                showRationaleDialog(desc, permissions, requestCode);
            } else {
                requestPermissions(permissions, requestCode);
            }

    }

    /**
     * 弹出声明的 Dialog
     *
     * @param desc
     * @param permissions
     * @param requestCode
     */
    private void showRationaleDialog(String desc, final String[] permissions, final int requestCode) {
        final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setTitle("提示")
                .setMessage(desc)
                .setPositiveButton("确认", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        dialogInterface.dismiss();
                        requestPermissions(permissions, requestCode);
                    }
                })
                .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        dialogInterface.dismiss();
                    }
                })
                .setCancelable(false)
                .show();
    }


    /**
     * 再次申请权限时，是否需要声明
     *
     * @param permissions
     * @return
     */
    private boolean showRationale(String[] permissions) {
        for (String permission : permissions) {
            if (shouldShowRequestPermissionRationale(permission)){
                return true;
            }
        }
        return false;
    }


    /**
     * 检察每个权限是否申请
     *
     * @param permissions
     * @return true 需要申请权限,false 已申请权限
     */
    private List<String> checkPermission(String[] permissions) {
        List<String> data = new ArrayList<>();
        for (String permission : permissions) {
            if (ContextCompat.checkSelfPermission(getActivity(), permission) != PackageManager.PERMISSION_GRANTED) {
                data.add(permission);
            }
        }
        return data;
    }

    /**
     * 申请权限结果的回调
     *
     * @param requestCode
     * @param permissions
     * @param grantResults
     */
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == mRequestCode) {
            if (checkEachPermissionsGranted(grantResults)) {
                if (mListener != null) {
                    mListener.onPermissionGranted();
                }
            } else {// 用户拒绝申请权限
                if (mListener != null) {
                    mListener.onPermissionDenied();
                }
            }
        }
    }

    /**
     * 检查回调结果
     *
     * @param grantResults
     * @return
     */
    private boolean checkEachPermissionsGranted(int[] grantResults) {
        for (int result : grantResults) {
            if (result != PackageManager.PERMISSION_GRANTED) {
                return false;
            }
        }
        return true;
    }


    /**
     * 权限申请接口
     */
    public interface PermissionsResultListener {

        void onPermissionGranted();

        void onPermissionDenied();

    }
}