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Android AOP网络检查

功能实现

定义注解

@Retention(RetentionPolicy.RUNTIME)@Target(ElementType.METHOD)public @interface CheckNet {
       int SHOW_TIP = 1;    int SHOW_DIALOG = 2;    int value() default SHOW_TIP;}

定义切面类

@Aspectpublic class CheckNetAspect {
       @Pointcut("execution(@com.example.mylibrary.network.CheckNet * *(..))")    public void method() {
       }    @Around("method()")    public void handleCheckNet(ProceedingJoinPoint joinPoint) throws Throwable {
           MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();        CheckNet checkNet = methodSignature.getMethod().getAnnotation(CheckNet.class);        if (checkNet != null) {
               Object aThis = joinPoint.getThis();            Context context = getContext(aThis);            if (context != null && !isNetworkAvailable(context)) {
                   if (checkNet.value() == CheckNet.SHOW_TIP) {
                       showTip(context);                } else if (checkNet.value() == CheckNet.SHOW_DIALOG) {
                       showSettingDialog(context);                }                return;            }        }        joinPoint.proceed();    }    /**     * 显示提示     */    private void showTip(Context context) {
           Toast.makeText(context, "当前没有网络连接，请检查网络设置", Toast.LENGTH_SHORT).show();    }    /**     * 显示弹窗     */    private void showSettingDialog(Context context) {
           new AlertDialog.Builder(context)                .setMessage("当前没有网络连接，请检查网络设置")                .setPositiveButton("设置", new DialogInterface.OnClickListener() {
                       @Override                    public void onClick(DialogInterface dialog, int which) {
                           context.startActivity(new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS)                                .setFlags(Intent.FLAG_ACTIVITY_NEW_TASK));                    }                })                .show();    }    /**     * 判断网络是否能用     */    private boolean isNetworkAvailable(Context context) {
           ConnectivityManager manager = ContextCompat.getSystemService(context, ConnectivityManager.class);        if (manager != null) {
               NetworkInfo info = manager.getActiveNetworkInfo();            // 判断网络是否连接            if (info == null || !info.isConnected()) {
                   return false;            }        }        return true;    }    /**     * 获取Context对象     */    private Context getContext(Object object) {
           if (object instanceof Activity) {
               return (Activity) object;        } else if (object instanceof Fragment) {
               Fragment fragment = (Fragment) object;            return fragment.getActivity();        } else if (object instanceof View) {
               View view = (View) object;            return view.getContext();        }        return null;    }}

使用

@CheckNet()private void getUserInfo() {
       Log.e(TAG, "获取用户信息");}@CheckNet(CheckNet.SHOW_DIALOG)private void getUserInfo2() {
       Log.e(TAG, "获取用户信息2");}

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