android 6.0 以上权限申请工具类

1.接口类，由Activity负责实现

/**
 * ${description}
 * Created by gyq on 2018/7/16.
 */
public interface PermissionInterface {
    /**
     * 可设置请求权限请求码
     */
    int getPermissionsRequestCode();

    /**
     * 设置需要请求的权限
     */
    String[] getPermissions();

    /**
     * 请求权限成功回调
     */
    void requestPermissionsSuccess();

    /**
     * 请求权限失败回调
     */
    void requestPermissionsFail();

}

2.帮助类

/**
 * 权限申请帮助类，权限申请和对申请结果的处理
 * Created by gyq on 2018/7/16.
 */
public class PermissionHelper {
    private Activity mActivity;
    private PermissionInterface mPermissionInterface;

    public PermissionHelper(@NonNull Activity activity, @NonNull PermissionInterface permissionInterface) {
        mActivity = activity;
        mPermissionInterface = permissionInterface;
    }

    /**
     * 开始请求权限。
     * 方法内部已经对Android M 或以上版本进行了判断，外部使用不再需要重复判断。
     * 如果设备还不是M或以上版本，则也会回调到requestPermissionsSuccess方法。
     */
    public void requestPermissions(){
        String[] deniedPermissions = PermissionUtil.getDeniedPermissions(mActivity, mPermissionInterface.getPermissions());
        if(deniedPermissions != null && deniedPermissions.length > 0){
            PermissionUtil.requestPermissions(mActivity, deniedPermissions, mPermissionInterface.getPermissionsRequestCode());
        }else{
            mPermissionInterface.requestPermissionsSuccess();
        }
    }

    /**
     * 在Activity中的onRequestPermissionsResult中调用
     * @param requestCode
     * @param permissions
     * @param grantResults
     * @return true 代表对该requestCode感兴趣，并已经处理掉了。false 对该requestCode不感兴趣，不处理。
     */
    public boolean requestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults){
        if(requestCode == mPermissionInterface.getPermissionsRequestCode()){
            //是否全部权限已授权
            boolean isAllGranted = true;
            for(int result : grantResults){
                if(result == PackageManager.PERMISSION_DENIED){
                    isAllGranted = false;
                    break;
                }
            }
            if(isAllGranted){
                //已全部授权
                mPermissionInterface.requestPermissionsSuccess();
            }else{
                //权限有缺失
                mPermissionInterface.requestPermissionsFail();
            }
            return true;
        }
        return false;
    }

}

3.工具类

public class PermissionUtil {
    /**
     * 判断是否有某个权限
     * @param context
     * @param permission
     * @return
     */
    public static boolean hasPermission(Context context, String permission){
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if(context.checkSelfPermission(permission)  != PackageManager.PERMISSION_GRANTED){
                return false;
            }
        }
        return true;
    }

    /**
     * 弹出对话框请求权限
     * @param activity
     * @param permissions
     * @param requestCode
     */
    public static void requestPermissions(Activity activity, String[] permissions, int requestCode){
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            activity.requestPermissions(permissions, requestCode);
        }
    }

    /**
     * 返回缺失的权限
     * @param context
     * @param permissions
     * @return 返回缺少的权限，null 意味着没有缺少权限
     */
    public static String[] getDeniedPermissions(Context context, String[] permissions){
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            ArrayList<String> deniedPermissionList = new ArrayList<>();
            for(String permission : permissions){
                if(context.checkSelfPermission(permission) != PackageManager.PERMISSION_GRANTED){
                    deniedPermissionList.add(permission);
                }
            }
            int size = deniedPermissionList.size();
            if(size > 0){
                return deniedPermissionList.toArray(new String[deniedPermissionList.size()]);
            }
        }
        return null;
    }

}

4.使用案例

Activity 实现接口 接口方法的实现，权限回调处理