Java 如何共享片段和活动之间的连接
我有蓝牙碎片。 我的第一个活动是建立BT连接。向用户提供了一个选项，根据用户的选择，将加载不同的活动Java 如何共享片段和活动之间的连接,java,android,bluetooth,connection,Java,Android,Bluetooth,Connection,我有蓝牙碎片。 我的第一个活动是建立BT连接。向用户提供了一个选项，根据用户的选择，将加载不同的活动 public class BluetoothFragment extends Fragment { private NameMappingDataSource mName; private DeviceAutoConnectDataSource deviceAutoConnect; private A
public class BluetoothFragment extends Fragment {
private NameMappingDataSource mName;
private DeviceAutoConnectDataSource deviceAutoConnect;
private ActivateDatasource activateDatasource;
List<DisplayNameMapping> dataItemsdevice = new ArrayList<DisplayNameMapping>();
private static final String TAG = "BluetoothChatFragment";
private static final int REQUEST_CONNECT_DEVICE_SECURE = 1;
private static final int REQUEST_CONNECT_DEVICE_INSECURE = 2;
private static final int REQUEST_ENABLE_BT = 3;
private ListView mConversationView;
private EditText mOutEditText;
private Button mSendButton;
private String mConnectedDeviceName = null;
private String mConnectedDeviceAddress = null;
private ArrayAdapter<String> mConversationArrayAdapter;
private StringBuffer mOutStringBuffer;
private BluetoothAdapter mBluetoothAdapter = null;
private BluetoothService mMessage = null;
private Context context;
boolean mBound = false;
@Override
public Context getContext() {
return context;
}
public void setContext(Context context) {
this.context = context;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mName = new NameMappingDataSource(getActivity());
deviceAutoConnect = new DeviceAutoConnectDataSource(getActivity());
activateDatasource = new ActivateDatasource(getActivity());
setHasOptionsMenu(true);
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter == null) {
FragmentActivity activity = getActivity();
Toast.makeText(activity, "Bluetooth is not available", Toast.LENGTH_LONG).show();
activity.finish();
}
}
@Override
public void onStart() {
super.onStart();
if (!mBluetoothAdapter.isEnabled()) {
Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
} else if (mMessage == null) {
setupChat();
}
}
@Override
public void onDestroy() {
super.onDestroy();
if (mMessage != null) {
mMessage.stop();
}
}
@Override
public void onResume() {
super.onResume();
if (mMessage != null) {
if (mMessage.getState() == BluetoothService.STATE_NONE) {
mMessage.start();
}
}
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
@Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_bluetooth_chat, container, false);
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
mConversationView = (ListView) view.findViewById(R.id.in);
mOutEditText = (EditText) view.findViewById(R.id.edit_text_out);
mSendButton = (Button) view.findViewById(R.id.button_send);
}
private void setupChat() {
mConversationArrayAdapter = new ArrayAdapter<String>(getActivity(), R.layout.message);
mConversationView.setAdapter(mConversationArrayAdapter);
mOutEditText.setOnEditorActionListener(mWriteListener);
mSendButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
View view = getView();
if (null != view) {
TextView textView = (TextView) view.findViewById(R.id.edit_text_out);
String message = textView.getText().toString();
sendMessage(message.getBytes());
}
}
});
final Button testButton = (Button) getActivity().findViewById(R.id.button1);
testButton.setTag(1);
testButton.setBackgroundResource(R.drawable.open);
testButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final int status = (Integer) v.getTag();
if (status == 1) {
v.setTag(0);
} else {
testButton.setBackgroundResource(R.drawable.open);
v.setTag(1);
}
}
});
mMessage = new BluetoothService(getActivity(), mHandler);
mOutStringBuffer = new StringBuffer("");
}
private void ensureDiscoverable() {
if (mBluetoothAdapter.getScanMode() !=
BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) {
Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
startActivity(discoverableIntent);
}
}
public void sendMessage(byte[] message) {
if (mMessage.getState() != BluetoothService.STATE_CONNECTED) {
Toast.makeText(getActivity(), R.string.not_connected, Toast.LENGTH_SHORT).show();
return;
}
if (message.length > 0) {
mMessage.write(message);
mOutStringBuffer.setLength(0);
mOutEditText.setText(mOutStringBuffer);
}
}
private TextView.OnEditorActionListener mWriteListener
= new TextView.OnEditorActionListener() {
public boolean onEditorAction(TextView view, int actionId, KeyEvent event) {
// If the action is a key-up event on the return key, send the message
if (actionId == EditorInfo.IME_NULL && event.getAction() == KeyEvent.ACTION_UP) {
String message = view.getText().toString();
sendMessage(message.getBytes());
}
return true;
}
};
private void setStatus(int resId) {
FragmentActivity activity = getActivity();
if (null == activity) {
return;
}
final ActionBar actionBar = activity.getActionBar();
if (null == actionBar) {
return;
}
actionBar.setSubtitle(resId);
}
private void setStatus(CharSequence subTitle) {
FragmentActivity activity = getActivity();
if (null == activity) {
return;
}
final ActionBar actionBar = activity.getActionBar();
if (null == actionBar) {
return;
}
actionBar.setSubtitle(subTitle);
}
private final Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
int t = 0;
FragmentActivity activity = getActivity();
switch (msg.what) {
case Constants.MESSAGE_STATE_CHANGE:
switch (msg.arg1) {
case BluetoothService.STATE_CONNECTED:
setStatus(getString(R.string.title_connected_to, mConnectedDeviceName));
mConversationArrayAdapter.clear();
break;
case BluetoothService.STATE_CONNECTING:
setStatus(R.string.title_connecting);
break;
case BluetoothService.STATE_LISTEN:
case BluetoothService.STATE_NONE:
setStatus(R.string.title_not_connected);
break;
}
break;
case Constants.MESSAGE_WRITE:
byte[] writeBuf = (byte[]) msg.obj;
mConversationArrayAdapter.add("Me: " + writeBuf);
break;
case Constants.MESSAGE_READ:
byte[] readBuf = (byte[]) msg.obj;
String readMessage = new String(readBuf, 0, msg.arg1);
mConversationArrayAdapter.add(mConnectedDeviceName + ": " + readMessage);
break;
case Constants.MESSAGE_DEVICE_NAME:
mConnectedDeviceName = msg.getData().getString(Constants.DEVICE_NAME);
mConnectedDeviceAddress = msg.getData().getString(Constants.DEVICE_ADDRESS);
if (null != activity) {
Toast.makeText(activity, "Connected to "
+ mConnectedDeviceName, Toast.LENGTH_SHORT).show();
}
break;
case Constants.MESSAGE_TOAST:
if (null != activity) {
Toast.makeText(activity, msg.getData().getString(Constants.TOAST),
Toast.LENGTH_SHORT).show();
mConnectedDeviceAddress=null;
}
break;
}
}
};
public void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case REQUEST_CONNECT_DEVICE_SECURE:
if (resultCode == Activity.RESULT_OK) {
connectDevice(data, true);
}
break;
case REQUEST_CONNECT_DEVICE_INSECURE:
if (resultCode == Activity.RESULT_OK) {
connectDevice(data, false);
}
break;
case REQUEST_ENABLE_BT:
if (resultCode == Activity.RESULT_OK) {
setupChat();
} else {
Log.d(TAG, "BT not enabled");
Toast.makeText(getActivity(), R.string.bt_not_enabled_leaving,
Toast.LENGTH_SHORT).show();
getActivity().finish();
}
}
}
private void connectDevice(Intent data, boolean secure) {
String address = data.getExtras()
.getString(DeviceListActivity.EXTRA_DEVICE_ADDRESS);
BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
mMessage.connect(device, secure);
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.bluetooth_chat, menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.secure_connect_scan: {
Intent serverIntent = new Intent(this.context, DeviceListActivity.class);
startActivityForResult(serverIntent, REQUEST_CONNECT_DEVICE_SECURE);
return true;
}
case R.id.insecure_connect_scan: {
Intent serverIntent = new Intent(this.context, DeviceListActivity.class);
startActivityForResult(serverIntent, REQUEST_CONNECT_DEVICE_INSECURE);
return true;
}
case R.id.discoverable: {
ensureDiscoverable();
return true;
}
case R.id.menu_user: {
if(mConnectedDeviceAddress!=null) {
mName.open();
List<DisplayNameMapping> str = mName.getDisplayNameMappingLiked(mConnectedDeviceAddress);
mName.close();
String setname = str.get(0).getDisplay_name();
showInputDialogCheckPWAdminUser(setname, mConnectedDeviceAddress);
}
return true;
}
case R.id.menu_history: {
Intent userIntent = new Intent(getActivity(),UserListActivity.class);
userIntent.putExtra("addressdevice", mdeviceaddress);
startActivity(userIntent);
}
}
return false;
}
}
您可以保存上次连接的设备地址，然后使用它
String address = intent.getExtras()
.getString(DeviceListActivity.EXTRA_DEVICE_ADDRESS);
// Get the BluetoothDevice object
BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
// Attempt to connect to the device
mChatService.connect(device, secure);
您可以保存上次连接的设备地址，然后使用它
String address = intent.getExtras()
.getString(DeviceListActivity.EXTRA_DEVICE_ADDRESS);
// Get the BluetoothDevice object
BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
// Attempt to connect to the device
mChatService.connect(device, secure);