在我的情况下，如果来自蓝牙的strReceived与最终声明的字符串str匹配，我在启动新意图时会遇到问题或调用方法来启动此意图。如何解决'无法从类型Activity'对非静态方法getIntent（）进行静态引用。
我注意到我无法在处理程序之外引用此全局strReceived值：
public class Standby extends ListActivity {
public final static String UUID = "00001101-0000-1000-8000-00805F9B34FB";
public final static String str = "\fDETECT1\n\r";
public static String strRead;
public static String strReceived;
BluetoothAdapter bluetoothAdapter;
BroadcastReceiver discoverDevicesReceiver;
BroadcastReceiver discoveryFinishedReceiver;
//---store all the discovered devices---
ArrayList<BluetoothDevice> discoveredDevices;
ArrayList<String> discoveredDevicesNames;
public static TextView txtData;
//---thread for connecting to the client socket---
ConnectToServerThread connectToServerThread;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.standby);
//---init the ArrayList objects and bluetooth adapter---
discoveredDevices = new ArrayList<BluetoothDevice>();
discoveredDevicesNames = new ArrayList<String>();
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
//---for displaying the messages received---
txtData = (TextView) findViewById(R.id.txtData);
}
//Method to make yourself discoverable
public void MakeDiscoverable(View view)
{
Intent i = new Intent(
BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
i.putExtra(
BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300); //300 seconds
startActivity(i);
}
//Method to discover other bluetooth devices
private void DiscoveringDevices() {
if (discoverDevicesReceiver == null) {
discoverDevicesReceiver = new BroadcastReceiver() {
//Fired when a new device is discovered
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
//When a device is discovered---
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
//---get the BluetoothDevice object from
// the Intent---
BluetoothDevice device =
intent.getParcelableExtra(
BluetoothDevice.EXTRA_DEVICE);
//---add the name and address to an array
// adapter to show in a ListView---
//---only add if the device is not already
// in the list---
if (!discoveredDevices.contains(device)) {
//---add the device---
discoveredDevices.add(device);
//---add the name of the device; used for
// ListView---
discoveredDevicesNames.add(device.getName());
//---display the items in the ListView---
setListAdapter(new
ArrayAdapter<String>(getBaseContext(),
android.R.layout.simple_list_item_1,
discoveredDevicesNames));
}
}
}
};
}
if (discoveryFinishedReceiver==null) {
discoveryFinishedReceiver = new BroadcastReceiver() {
//Fired when the discovery is done
public void onReceive(Context context, Intent intent) {
//---enable the listview when discovery is over;
// about 12 seconds---
getListView().setEnabled(true);
Toast.makeText(getBaseContext(),
"Discovery completed. Please select BlueBee.",
Toast.LENGTH_LONG).show();
unregisterReceiver(discoveryFinishedReceiver);
}
};
}
//---register the broadcast receivers---
IntentFilter filter1 = new
IntentFilter(BluetoothDevice.ACTION_FOUND);
IntentFilter filter2 = new
IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
registerReceiver(discoverDevicesReceiver, filter1);
registerReceiver(discoveryFinishedReceiver, filter2);
//---disable the listview when discover is in progress---
getListView().setEnabled(false);
Toast.makeText(getBaseContext(),
"Discovery in progress...please wait...",
Toast.LENGTH_LONG).show();
bluetoothAdapter.startDiscovery();
}
//Calls the method to discover other bluetooth devices
public void DiscoverDevices(View view)
{
//---discover other devices---
DiscoveringDevices();
}
static Handler UIupdater = new Handler(){
public void handleMessage(Message msg) {
int numOfBytesReceived = msg.arg1;
byte[] buffer = (byte[]) msg.obj;
//---convert the entire byte array to string---
String strReceived = new String(buffer);
//---extract only the actual string received---
strReceived = strReceived.substring(
0, numOfBytesReceived);
//---display the text from string str on the TextView in one line only---
//txtData.setText(strReceived);
//Compare string. Method will return 0 if both are identical
if (strReceived.compareTo(str)==0){
txtData.setText("FALL DETECTED!!");
Intent i = new Intent ("com.example.NEXT");
//Get the data using bundle
//Add the set of extended data to the intent and start it
Bundle b = getIntent().getExtras();
i.putExtras(b);
startActivity(i);
//readySMS();
}
}
};
//Fired when method is called
public void readySMS() {
// TODO Auto-generated method stub
Intent i = new Intent ("com.example.NEXT");
//Get the data using bundle
//Add the set of extended data to the intent and start it
Bundle b = getIntent().getExtras();
i.putExtras(b);
startActivity(i);
}
public void onPause() {
super.onPause();
//---cancel discovery of other bluetooth devices
bluetoothAdapter.cancelDiscovery();
//---unregister the broadcast receiver for
// discovering devices---
if (discoverDevicesReceiver != null) {
try {
unregisterReceiver(discoverDevicesReceiver);
} catch(Exception e) {
}
}
//---if you are currently connected to someone...---
if (connectToServerThread!=null) {
try {
//---close the connection---
connectToServerThread.bluetoothSocket.close();
//Calls the method to get ready to SMS
} catch (IOException e) {
Log.d("MainActivity", e.getLocalizedMessage());
}
}
}
//Fired when a client is tapped in the ListView---
public void onListItemClick(ListView parent, View v,
int position, long id) {
//---if you are already talking to someone...---
if (connectToServerThread!=null) {
try {
//---close the connection first---
connectToServerThread.bluetoothSocket.close();
} catch (IOException e) {
Log.d("MainActivity", e.getLocalizedMessage());
//Toast.makeText(this, "Connect failed", Toast.LENGTH_SHORT).show();
}
}
//---connect to the selected Bluetooth device---
BluetoothDevice deviceSelected =
discoveredDevices.get(position);
connectToServerThread = new
ConnectToServerThread(deviceSelected, bluetoothAdapter);
connectToServerThread.start();
/*
Thread cancel = new Thread(){
public void run(){
//this must be the same as the action name to be performed in manifest.xml file
//if (txtData.getText().toString().equalsIgnoreCase(str)){
//if (strReceived!=null){
// strRead = strReceived;
// if (strRead.compareTo(str)==0){
try{
sleep(3000);
Intent i = new Intent ("com.nick.falldetection.CANCEL");
//Get the data using bundle
//Add the set of extended data to the intent and start it
Bundle b = getIntent().getExtras();
//String owner = b.getString("abc");
//String message = b.getString("longMessage");
//String phoneNo = b.getString("phoneNo");
i.putExtras(b);
startActivity(i);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally{
//finish();
}
}
//}
};
{
cancel.start();
}
*/
};
}
答案 0 :(得分：0)
您可以通过在YourActivity mActivity中添加Handler字段并在活动this中将其设置为onCreate来解决此问题。这样，您就可以通过YourActivity从处理程序中获取mHandler.mActivity.yourFieldOrMethod所拥有的任何内容。
你喜欢这个
class MyActivity {
static class MyHandler extends Handler() {
MyActivity mActivity;
void handleMessage() {
mActivity.someMethod();
}
};
private MyHandler uiHandler = new MyActivity();
private void someMethod() { /* ... */ }
void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
uiHandler.mActivity = this;
}
}
答案 1 :(得分：0)
试试这个。
Standby me;
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
me = this;
}
static Handler UIupdater = new Handler()
{
public void handleMessage(Message msg)
{
strReceived = me.strReceived.substring(0, numOfBytesReceived);
抱歉延误。希望这会对你有所帮助。