我有一个简单的按钮类，当按钮被点击时，我希望另一个类被安装并调用所有的方法。按钮类：

public class ButtonActivity extends Activity {

Button myButton;

TextView myLabel;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

myButton = (Button)findViewById(R.id.button1);

myLabel = (TextView)findViewById(R.id.textView1);

myButton.setOnClickListener(new View.OnClickListener() {

public void onClick(View v)

{

myLabel.setText("Fired");

SendClass sendy = new SendClass();

sendy.onReceive(null, null );

}

});

}

}第二类发送广播消息：

public class SendClass extends BroadcastReceiver {

private static final int UDP_SERVER_PORT = 2562;

Context mContext ;

DatagramSocket mSocket ;

InetAddress myBcastIP, myLocalIP ;

@Override

public void onReceive(Context context, Intent intent) {

String msg = "Toast Message" ;

DatagramSocket ds = null;

mContext = context;

try {

ds = new DatagramSocket();

try {

myBcastIP = getBroadcastAddress();

mSocket = new DatagramSocket(UDP_SERVER_PORT);

mSocket.setBroadcast(true);

} catch (IOException e) {

}

String udpMsg = "hello";

InetAddress serverAddr = myBcastIP;

//InetAddress serverAddr = InetAddress.getByName("192.168.1.5");

DatagramPacket dp;

dp = new DatagramPacket(udpMsg.getBytes(), udpMsg.length(), serverAddr, UDP_SERVER_PORT);

ds.send(dp);

} catch (SocketException e) {

e.printStackTrace();

}catch (UnknownHostException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

} catch (Exception e) {

e.printStackTrace();

} finally {

if (ds != null) {

ds.close();

}

}

Toast.makeText(context, msg, Toast.LENGTH_LONG).show();

}

/**

* Calculate the broadcast IP we need to send the packet along.

*/

private InetAddress getBroadcastAddress() throws IOException {

WifiManager mWifi = (WifiManager) mContext.getSystemService(Context.WIFI_SERVICE);

WifiInfo info = mWifi.getConnectionInfo();

DhcpInfo dhcp = mWifi.getDhcpInfo();

if (dhcp == null) {

return null;

}

int broadcast = (dhcp.ipAddress & dhcp.netmask) | ~dhcp.netmask;

byte[] quads = new byte[4];

for (int k = 0; k < 4; k++)

quads[k] = (byte) ((broadcast >> k * 8) & 0xFF);

return InetAddress.getByAddress(quads); // The high order byte is quads[0].

}}

我认为问题在于onReceive(Context context, Intent intent)。

在ButtonClass中将值设置为NULL会导致强制关闭，并且我不能将其明显留空。

使用代码提示设置它们以：

sendy.onReceive(getBaseContext() , getIntent());意思是Toast动作触发，没有FC，但广播消息从不发送。