Android 3、registerReceiver和getApplicationContext函数的处理不存在

我正忙着拼凑一个应用程序，在Android设备和Arduino之间传输一些数据

原始代码取自教程，是为处理API 10开发的2.0b而编写的

我正在使用Processing 3，为API 15开发

代码如下：

/* DiscoverBluetooth: Written by ScottC on 18 March 2013 using 
 Processing version 2.0b8
 Tested on a Samsung Galaxy SII, with Android version 2.3.4
 Android ADK - API 10 SDK platform */

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.widget.Toast;
import android.view.Gravity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;



boolean foundDevice=false; //When this is true, the screen turns green.

//Get the default Bluetooth adapter
BluetoothAdapter bluetooth = BluetoothAdapter.getDefaultAdapter();


/*The startActivityForResult() within setup() launches an 
 Activity which is used to request the user to turn Bluetooth on. 
 The following onActivityResult() method is called when this 
 Activity exits. */
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data){
 if(requestCode==0){
 if(resultCode == -1){
 ToastMaster("Bluetooth has been switched ON");
 } else {
 ToastMaster("You need to turn Bluetooth ON !!!");
 }
 }
}



/* Create a Broadcast Receiver that will later be used to 
 receive the names of Bluetooth devices in range. */
BroadcastReceiver myDiscoverer = new myOwnBroadcastReceiver();



void setup(){
 orientation(LANDSCAPE);
 /*IF Bluetooth is NOT enabled, then ask user permission to enable it */
 if (!bluetooth.isEnabled()) {
 Intent requestBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
 startActivityForResult(requestBluetooth, 0);
 }

 /*If Bluetooth is now enabled, then register a broadcastReceiver to report any
 discovered Bluetooth devices, and then start discovering */
 if (bluetooth.isEnabled()) {
 registerReceiver(myDiscoverer, new IntentFilter(BluetoothDevice.ACTION_FOUND));
 //Start bluetooth discovery if it is not doing so already
 if (!bluetooth.isDiscovering()){
 bluetooth.startDiscovery();
 }
 }
}



void draw(){
 //Display a green screen if a device has been found
 if(foundDevice){
 background(10,255,10);
 }
}



/* This BroadcastReceiver will display discovered Bluetooth devices */
public class myOwnBroadcastReceiver extends BroadcastReceiver {
 @Override
 public void onReceive(Context context, Intent intent) {
 String discoveredDeviceName = intent.getStringExtra(BluetoothDevice.EXTRA_NAME);

 //Display the name of the discovered device
 ToastMaster("Discovered: " + discoveredDeviceName);

 //Change foundDevice to true which will make the screen turn green
 foundDevice=true;
 }
}

/* My ToastMaster function to display a messageBox on the screen */

void ToastMaster(String textToDisplay){
 Toast myMessage = Toast.makeText(getApplicationContext(), 
 textToDisplay,
 Toast.LENGTH_LONG);
 myMessage.setGravity(Gravity.CENTER, 0, 0);
 myMessage.show();
}

我在第57行和第93行收到编译错误，说明：

The function "registerRevceiver(BroadcastReceiver, IntentFilter)" does not exist
The function "getApplicationContext()" does not exist

对于如何让这个代码示例工作，有人有什么想法吗？我怀疑这是一个与API级别和某些类型的库不匹配有关的问题

任何帮助都将不胜感激

---

Jono

而不是

getApplicationContext（）

使用

ActivityName。感谢您的回复。我尝试了一下，但我得到了另一个编译器错误：“类“ActivityName”不存在”。有什么我遗漏的吗？ThanksI的意思是把你活动的班级名称放在那里。主要活动或是其他什么，我不知道它叫什么。你能看一下密码并告诉我在哪里可以找到它吗？那会有帮助的。还有，为什么我不能使用getApplicationContext（）？我现在才意识到这不是Android应用，对不起。尽管如此，试着只使用
这个
。不用担心。我试过了，然后给出了错误
，函数“makeText（）”需要的参数是：“makeText（Context，CharSequence，int）”
。无论如何谢谢你的帮助。