自己寫了個Android添加大圖通知欄訊息的代碼并打包成jar包的

1、下載jar包或者aar包(下載到的壓縮包里面有libs目錄里面是已經編譯好的jar包和aar包，直接拿來就能放到專案里用，內部做了Android8.0適配)
除了libs目錄另外一個當然就是demo原始碼和這個通知欄訊息工具類原始碼

下載地址：https://wws.lanzoui.com/i62POq4twkb

2、判斷并開啟通知訊息權限

boolean enabled = isNotificationEnabled();

        if (!enabled) {
            /**
             * 跳到通知欄設定界面
             * @param context
             */
            Intent localIntent = new Intent();
            //直接跳轉到應用通知設定的代碼：
            if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
                localIntent.setAction("android.settings.APP_NOTIFICATION_SETTINGS");
                localIntent.putExtra("app_package", getPackageName());
                localIntent.putExtra("app_uid", getApplicationInfo().uid);
            } else if (android.os.Build.VERSION.SDK_INT == Build.VERSION_CODES.KITKAT) {
                localIntent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
                localIntent.addCategory(Intent.CATEGORY_DEFAULT);
                localIntent.setData(Uri.parse("package:" + getPackageName()));
            } else {
                //4.4以下沒有從app跳轉到應用通知設定頁面的Action，可考慮跳轉到應用詳情頁面,
                localIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                if (Build.VERSION.SDK_INT >= 9) {
                    localIntent.setAction("android.settings.APPLICATION_DETAILS_SETTINGS");
                    localIntent.setData(Uri.fromParts("package", getPackageName(), null));
                } else if (Build.VERSION.SDK_INT <= 8) {
                    localIntent.setAction(Intent.ACTION_VIEW);
                    localIntent.setClassName("com.android.settings", "com.android.setting.InstalledAppDetails");
                    localIntent.putExtra("com.android.settings.ApplicationPkgName", getPackageName());
                }
            }
            startActivity(localIntent);
        }

這是檢測通知訊息權限的方法：isNotificationEnabled

/**
     * 獲取通知權限
     */
    @TargetApi(Build.VERSION_CODES.KITKAT)
    private boolean isNotificationEnabled() {

        String CHECK_OP_NO_THROW = "checkOpNoThrow";
        String OP_POST_NOTIFICATION = "OP_POST_NOTIFICATION";

        AppOpsManager mAppOps = (AppOpsManager) getSystemService(APP_OPS_SERVICE);
        ApplicationInfo appInfo = getApplicationInfo();
        String pkg = getApplicationContext().getPackageName();
        int uid = appInfo.uid;

        Class appOpsClass = null;
        try {
            appOpsClass = Class.forName(AppOpsManager.class.getName());
            Method checkOpNoThrowMethod = appOpsClass.getMethod(CHECK_OP_NO_THROW, Integer.TYPE, Integer.TYPE,
                    String.class);
            Field opPostNotificationValue = appOpsClass.getDeclaredField(OP_POST_NOTIFICATION);

            int value = (Integer) opPostNotificationValue.get(Integer.class);
            return ((Integer) checkOpNoThrowMethod.invoke(mAppOps, value, uid, pkg) == AppOpsManager.MODE_ALLOWED);

        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }

3、創建管理類物件

private NotifiSmallManager smallManager;
smallManager = new NotifiSmallManager(this);

4、呼叫添加普通通知欄訊息的方法：

//注意，最后一個引數是Intent，就是當通知欄訊息被點擊后會跳轉到這個intent，如果不想讓跳轉視窗就傳入new Intent()即可
smallManager.createBasicNotify(1, R.mipmap.ic_launcher, "通知標題", "通知內容",new Intent(MainActivity.this,MainActivity.class));

5、呼叫添加大圖通知欄訊息的方法：

//這里是先獲取一張大圖，用于通知欄展示用的
Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.banner);
//這里添加大圖通知欄訊息
smallManager.createBigPicNotify(2, R.mipmap.ic_launcher, "大圖通知標題", "大圖通知內容", bitmap,new Intent(MainActivity.this,MainActivity.class));