我正在尝试创建一个蓝牙打印机应用程序。现在我在手机和蓝牙打印机之间建立了一个简单的连接。我想要一些功能
- 每次都建立连接，当我点击打印按钮时。但我想在每次点击打印按钮后在初始阶段建立连接，它需要直接打印。
- 只显示配对设备的列表，但我也想显示附近的
设备。
我正在尝试的是
print.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter == null) {
Toast.makeText(getContext(), "Message1", Toast.LENGTH_SHORT).show();
} else {
if (!mBluetoothAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(
BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent,
REQUEST_ENABLE_BT);
} else {
ListPairedDevices();
Intent connectIntent = new Intent(getContext(),
DeviceListActivity.class);
startActivityForResult(connectIntent,
REQUEST_CONNECT_DEVICE);
}
}
}
});
public void onActivityResult(int mRequestCode, int mResultCode,
Intent mDataIntent) {
super.onActivityResult(mRequestCode, mResultCode, mDataIntent);
switch (mRequestCode) {
case REQUEST_CONNECT_DEVICE:
if (mResultCode == Activity.RESULT_OK) {
Bundle mExtra = mDataIntent.getExtras();
String mDeviceAddress = mExtra.getString("DeviceAddress");
Log.v(TAG, "Coming incoming address " + mDeviceAddress);
mBluetoothDevice = mBluetoothAdapter
.getRemoteDevice(mDeviceAddress);
printCommand();
// pairToDevice(mBluetoothDevice); This method is replaced by
// progress dialog with thread
}
break;
case REQUEST_ENABLE_BT:
if (mResultCode == Activity.RESULT_OK) {
ListPairedDevices();
Intent connectIntent = new Intent(getContext(),
DeviceListActivity.class);
startActivityForResult(connectIntent, REQUEST_CONNECT_DEVICE);
} else {
Toast.makeText(getContext(), "Message", Toast.LENGTH_SHORT).show();
}
break;
}
}
private void ListPairedDevices() {
Set<BluetoothDevice> mPairedDevices = mBluetoothAdapter
.getBondedDevices();
if (mPairedDevices.size() > 0) {
for (BluetoothDevice mDevice : mPairedDevices) {
Log.v(TAG, "PairedDevices: " + mDevice.getName() + " "
+ mDevice.getAddress());
}
}
}
void printCommand(){
try {
mBluetoothSocket = mBluetoothDevice
.createRfcommSocketToServiceRecord(applicationUUID);
mBluetoothAdapter.cancelDiscovery();
mBluetoothSocket.connect();
// mHandler.sendEmptyMessage(0);
} catch (IOException eConnectException) {
Log.d(TAG, "CouldNotConnectToSocket", eConnectException);
closeSocket(mBluetoothSocket);
return;
}
Thread t = new Thread() {
public void run() {
try {
OutputStream os = mBluetoothSocket
.getOutputStream();
String BILL = "";
BILL = " Demo \n";
BILL = BILL
+ "---------------------------------------------\n";
BILL = BILL + String.format("%1$-5s %2$-14s %3$5s %4$5s
%5$8s", "s.No", "Product", "Rate","Qty", "Amount");
os.write(BILL.getBytes());
//This is printer specific code you can comment ==== > Start
// Setting height
int gs = 29;
os.write(intToByteArray(gs));
int h = 104;
os.write(intToByteArray(h));
int n = 162;
os.write(intToByteArray(n));
// Setting Width
int gs_width = 29;
os.write(intToByteArray(gs_width));
int w = 119;
os.write(intToByteArray(w));
int n_width = 2;
os.write(intToByteArray(n_width));
} catch (Exception e) {
Log.e("MainActivity", "Exe ", e);
}
}
};
t.start();
}
public static byte intToByteArray(int value) {
byte[] b = ByteBuffer.allocate(4).putInt(value).array();
for (int k = 0; k < b.length; k++) {
System.out.println("Selva [" + k + "] = " + "0x"
+ UnicodeFormatter.byteToHex(b[k]));
}
return b[3];
}
DeviceListActivity.Class 用于显示配对设备列表
public class DeviceListActivity extends Activity {
protected static final String TAG = "TAG";
private BluetoothAdapter mBluetoothAdapter;
private ArrayAdapter<String> mPairedDevicesArrayAdapter;
@Override
protected void onCreate(Bundle mSavedInstanceState) {
super.onCreate(mSavedInstanceState);
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
setContentView(R.layout.device_list);
setResult(Activity.RESULT_CANCELED);
mPairedDevicesArrayAdapter = new ArrayAdapter<String>(this,
R.layout.device_name);
ListView mPairedListView = (ListView) findViewById(R.id.paired_devices);
mPairedListView.setAdapter(mPairedDevicesArrayAdapter);
mPairedListView.setOnItemClickListener(mDeviceClickListener);
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
Set<BluetoothDevice> mPairedDevices = mBluetoothAdapter.getBondedDevices();
if (mPairedDevices.size() > 0) {
findViewById(R.id.title_paired_devices).setVisibility(View.VISIBLE);
for (BluetoothDevice mDevice : mPairedDevices) {
mPairedDevicesArrayAdapter.add(mDevice.getName() + "\n" + mDevice.getAddress());
}
} else {
String mNoDevices = "None Paired";//getResources().getText(R.string.none_paired).toString();
mPairedDevicesArrayAdapter.add(mNoDevices);
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if (mBluetoothAdapter != null) {
mBluetoothAdapter.cancelDiscovery();
}
}
private OnItemClickListener mDeviceClickListener = new OnItemClickListener() {
public void onItemClick(AdapterView<?> mAdapterView, View mView, int mPosition, long mLong) {
try {
mBluetoothAdapter.cancelDiscovery();
String mDeviceInfo = ((TextView) mView).getText().toString();
String mDeviceAddress = mDeviceInfo.substring(mDeviceInfo.length() - 17);
Log.v(TAG, "Device_Address " + mDeviceAddress);
Bundle mBundle = new Bundle();
mBundle.putString("DeviceAddress", mDeviceAddress);
Intent mBackIntent = new Intent();
mBackIntent.putExtras(mBundle);
setResult(Activity.RESULT_OK, mBackIntent);
finish();
} catch (Exception ex) {
}
}
};
}
我有 android 的入门级知识。现在我需要您的支持来完成该应用程序。期待您的解决方案 编辑 1：在一个片段中建立蓝牙连接并在另一个片段中设置打印选项。我该怎么做，任何提供参考或示例会更有帮助