我正在尝试创建一个蓝牙打印机App.Now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
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 用于显示配对设备的LIst
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) {
}
}
};
}
我在android中有入门级知识。现在我需要你的支持才能完成该应用程序。为你的解决方案寻求解决方案 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。我可以这样做，任何一个给出参考或示例将更有帮助
答案 0 :(得分：0)
现在确定唯一的解决方案是连接蓝牙打印机并将其与共享首选项保存....然后使用它...这样配对后它不会询问超过1次只需要打开打印机和移动蓝牙并在Admin Mode。
也授予此权限
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
您的代码是完美的只需添加Shared Preference并始终使用此功能。