华为、三星等机型禁用通知权限后Toast不弹出

查看Toast源码后发现，Toast显示要通过INotificationManager类来实现，而当通知禁用后，调用此类会返回异常，所以导致通知不显示，源码如下：

public void show() {  if (mNextView == null) {    throw new RuntimeException("setView must have been called");  }  INotificationManager service = getService();  String pkg = mContext.getOpPackageName();  TN tn = mTN;  tn.mNextView = mNextView;  try {    service.enqueueToast(pkg, tn, mDuration);  } catch (RemoteException e) {    // 权限禁用后走这里，这里是空方法，所以会发生既不crash又无响应的情况  }}

解决方法

public class ToastUtils {    private static Object iNotificationManagerObj;        public static void show(Context context, String message) {        show(context.getApplicationContext(), message, Toast.LENGTH_SHORT);    }        public static void show(Context context, String message, int duration) {        if (TextUtils.isEmpty(message)) {            return;        }        //后setText 兼容小米默认会显示app名称的问题        Toast toast = Toast.makeText(context, null, duration);        toast.setText(message);        if (isNotificationEnabled(context)) {            toast.show();        } else {            showSystemToast(toast);        }    }        private static void showSystemToast(Toast toast) {        try {            Method getServiceMethod = Toast.class.getDeclaredMethod("getService");            getServiceMethod.setAccessible(true);            //hook INotificationManager            if (iNotificationManagerObj == null) {                iNotificationManagerObj = getServiceMethod.invoke(null);                Class iNotificationManagerCls = Class.forName("android.app.INotificationManager");                Object iNotificationManagerProxy = Proxy.newProxyInstance(toast.getClass().getClassLoader(), new Class[]{iNotificationManagerCls}, new InvocationHandler() {                    @Override                    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {                        //强制使用系统Toast                        if ("enqueueToast".equals(method.getName())                                || "enqueueToastEx".equals(method.getName())) {  //华为p20 pro上为enqueueToastEx                            args[0] = "android";                        }                        return method.invoke(iNotificationManagerObj, args);                    }                });                Field sServiceFiled = Toast.class.getDeclaredField("sService");                sServiceFiled.setAccessible(true);                sServiceFiled.set(null, iNotificationManagerProxy);            }            toast.show();        } catch (Exception e) {            e.printStackTrace();        }    }        private static boolean isNotificationEnabled(Context context) {        NotificationManagerCompat notificationManagerCompat = NotificationManagerCompat.from(context);        boolean areNotificationsEnabled = notificationManagerCompat.areNotificationsEnabled();        return areNotificationsEnabled;    }}

内容相同Toast短时间不能重复弹出

当我们重复点击Toast时候，会连续弹出很多Toast，视觉体验不好，于是网上流传着这些解决方法：

Toast mToast;public void showToast(String text) {  if (mToast == null) {    mToast = Toast.makeText(MainActivity.this, text, Toast.LENGTH_SHORT);  } else {    mToast.setText(text);    mToast.setDuration(Toast.LENGTH_SHORT);  }  mToast.show();}

文字相同且当前Toast正在显示时，系统会认为是误触操作，从而屏蔽当前显示Toast请求。

解决方法

https://github.com/getActivity/XToast

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