可以看到,Messenger 的构造方法中,传递了一个 Handler,当接收到客户端的 Message 消息时,会在 handleMessage() 方法中处理,并通过 mMessenger.getBinder() 返回 binder 对象。 接着,需要通过 Message 拿到两个数字,并返回相加的结果,如下: @Override public void handleMessage(@NonNull Message msg) { super.hand...
当在第4步中客户端向Service发送信息时,将Message的replyTo属性设置为客户端自己的Messenger。这样在第5步Service在Handler的handleMessage中处理收到的消息时,可以通过Message的Messenger再向客户端发送Message,这样客户端内维护的Handler对象就会收到来自于Service的Message,从而完成Service向客户端发送消息且客户端接收到消息...
因为子线程涉及到UI更新，，Android主线程是线程不安全的，也就是说，更新UI只能在主线程中更新，子线程中操作是危险的. 这个时候，Handler就出现了.,来解决这个复杂的问题 , 由于Handler运行在主线程中(UI线程中), 它与子线程可以通过Message对象来传递数据, 这个时候，Handler就承担着接受子线程传...
handler是Android给我们提供用来更新UI的一套机制,也是一套消息处理机制,通过它可以实现在不同线程之间传递消息 本章Handler类要用到的方法有: voidhandleMessage(Message msg);//需要重写的方法,用来处理接收的消息,只有当接收到发送者发来的消息,才会回调该方法Message obtainMessage();//获取一个消息对象booleansend...
Message android.os.Handler.obtainMessage(int what, int arg1, int arg2, Object obj) public final Message obtainMessage (int what, int arg1, int arg2, Object obj) Since: API Level 1 Same as obtainMessage(), except that it also sets the what, obj, arg1,and arg2 values on the returned ...
When a call comes in, if your tablet is closer to you than your phone, just answer the call on the tablet. Simply swipe the greenAnswericon to answer the call. You can also reject a call by swiping on the redHang upicon, or to send a message to the caller or call back by ...
add permission <uses-permission android:name="android.permission.SEND_SMS" /> 2. use the system send SMS function; The main code is as follows:复制 Intent intent = new Intent(Intent.ActionSend, Android.Net.Uri.Parse("smsto:" + phoneNumber)); intent.PutExtra("sms_body", message); ...
She messaged me on WhatsApp." 她在WhatsApp上给我发消息了。 ② DM (direct message) (sb): 给(某人)发私信 You can DM me if you have any questions. 如果有问题,你可以给我发私信。 03. send me down是什么意思? "Send sb down"是一个英语短语 ...
of using email or MMS is that it is a widely available method that works on almost all smartphones, including iPhones. However, there may be limitations on the size of the attachment, and the recipient may need to download the attachment before being able to listen to the voice message. ...
From the 'Subject' field, enter a subject. From the 'Compose' email field, enter a message To add an attachment: Tap the Attach icon . Tap 'Attach file' or 'Insert from Drive'. Navigate to then tap the appropriate attachment.