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   源码介绍

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package org.yuc.bluetooth;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.LinkedHashMap;
import java.util.LinkedList;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.Toast;

/**
 * Android蓝牙图片打印
 * 
 * @author 小土豆YUC 2015年12月15日
 */
public class MainActivity extends Activity {

	// Message types sent from the BluetoothService Handler
	public static final int MESSAGE_STATE_CHANGE = 1;
	public static final int MESSAGE_READ = 2;
	public static final int MESSAGE_WRITE = 3;
	public static final int MESSAGE_DEVICE_NAME = 4;
	public static final int MESSAGE_TOAST = 5;

	// Key names received from the BluetoothService Handler
	public static final String DEVICE_NAME = "device_name";
	public static final String TOAST = "toast";

	// Intent request codes
	private static final int REQUEST_CONNECT_DEVICE = 1;
	private static final int REQUEST_ENABLE_BT = 2;

	// Name of the connected device
	private String mConnectedDeviceName = null;
	// String buffer for outgoing messages
	private StringBuffer mOutStringBuffer;
	// Local Bluetooth adapter
	private BluetoothAdapter mBluetoothAdapter = null;
	// Member object for the services
	public static BluetoothService mService = null;
	private EditText print_et;
	private RadioGroup radioGroup1;
	private RadioGroup radioGroup2;
	// private RadioGroup radioGroup3;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		// Get local Bluetooth adapter
		mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

		// If the adapter is null, then Bluetooth is not supported
		if (mBluetoothAdapter == null) {
			Toast.makeText(this, "您的设备不支持蓝牙", 0).show();
			// finish();
			return;
		}

		print_et = (EditText) findViewById(R.id.print_et);
		print_connect_btn = (Button) findViewById(R.id.print_connect_btn);
		radioGroup1 = (RadioGroup) findViewById(R.id.radioGroup1);
		radioGroup2 = (RadioGroup) findViewById(R.id.radioGroup2);
		// radioGroup3 = (RadioGroup) findViewById(R.id.radioGroup3);

		radioGroup1.setOnCheckedChangeListener(new OnCheckedChangeListener() {

			@Override
			public void onCheckedChanged(RadioGroup group, int checkedId) {
				switch (checkedId) {
				case R.id.radio0:
					mService.printLeft();
					break;
				case R.id.radio1:
					mService.printCenter();
					break;
				case R.id.radio2:
					mService.printRight();
					break;
				}
			}
		});

		radioGroup2.setOnCheckedChangeListener(new OnCheckedChangeListener() {

			@Override
			public void onCheckedChanged(RadioGroup group, int checkedId) {
				switch (checkedId) {
				case R.id.radio0:
					mService.printSize(0);
					break;
				case R.id.radio1:
					mService.printSize(1);
					break;
				case R.id.radio2:
					mService.printSize(2);
					break;
				}
			}
		});

		// radioGroup3.setOnCheckedChangeListener(new OnCheckedChangeListener()
		// {
		//
		// @Override
		// public void onCheckedChanged(RadioGroup group, int checkedId) {
		// switch (checkedId) {
		// case R.id.radio0:
		// mService.print(11);
		// break;
		// case R.id.radio1:
		// mService.print(12);
		// break;
		// }
		// }
		// });
	}

	@Override
	public void onStart() {
		super.onStart();
		if (!mBluetoothAdapter.isEnabled()) {
			// 打开蓝牙
			Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
			startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
		}
		if (mService == null) {
			mService = new BluetoothService(this, mHandler);
		}
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.option_menu, menu);
		return true;
	}

	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.print_btn:

			TextFormatUtil t = new TextFormatUtil();
			sendMessage(t.getLineTitle("天津漫威大酒店")   "\n");
			sendMessage(" \n");
			sendMessage(" \n");
			LinkedHashMap l = new LinkedHashMap<String, LinkedList<String>>();
			
			LinkedList li0 = new LinkedList<String>();
			l.put(" \n --------------------------- \n",li0);
			LinkedList li = new LinkedList<String>();
			li.add("小笼包$12个$10元");
			li.add("小笼包$12个$10元");
			li.add("小笼包$12个$10元");
			li.add("小笼包$12个$10元");
			l.put("早餐", li);
			LinkedList li2 = new LinkedList<String>();
			li2.add("牛肉面$1个$8元");
			li2.add("牛肉面$1个$8元");
			li2.add("牛肉面$1个$8元");
			li2.add("牛肉面$1个$8元");
			li2.add("牛肉面$1个$8元");
			li2.add("牛肉面$1个$8元");
			l.put("午餐", li2);
			sendMessage(t.printMenuMSG(l)   "\n");
			break;
		case R.id.print_img_btn:
			sendMessage("\n");
			sendMessage("\n");

			BufferedInputStream bis = null;
			try {
				bis = new BufferedInputStream(getAssets().open("logo.jpg"));
			} catch (IOException e) {
				e.printStackTrace();
			}
			Bitmap bitmap = BitmapFactory.decodeStream(bis);

			sendMessage(bitmap);

			sendMessage(" \n");
			sendMessage(" \n");
			sendMessage(" \n");
			break;
		case R.id.print_connect_btn:
			openOptionsMenu();
			break;
		case R.id.print_out_btn:
			sendMessage(" \n");
			break;
		}
	}

	/**
	 * 打印
	 * 
	 * @param message
	 */
	private void sendMessage(String message) {
		// Check that we're actually connected before trying anything
		if (mService.getState() != BluetoothService.STATE_CONNECTED) {
			Toast.makeText(this, "蓝牙没有连接", Toast.LENGTH_SHORT).show();
			return;
		}

		// Check that there's actually something to send
		if (message.length() > 0) {
			// Get the message bytes and tell the BluetoothService to write
			byte[] send;
			try {
				send = message.getBytes("GBK");
			} catch (UnsupportedEncodingException e) {
				send = message.getBytes();
			}

			mService.write(send);
		}
	}

	private void sendMessage(Bitmap bitmap) {
		// Check that we're actually connected before trying anything
		if (mService.getState() != BluetoothService.STATE_CONNECTED) {
			Toast.makeText(this, "蓝牙没有连接", Toast.LENGTH_SHORT).show();
			return;
		}
		// 发送打印图片前导指令
		byte[] start = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1B, 0x40, 0x1B, 0x33, 0x00 };
		mService.write(start);

		/** 获取打印图片的数据 **/
		// byte[] send = getReadBitMapBytes(bitmap);

		mService.printCenter();
		byte[] draw2PxPoint = PicFromPrintUtils.draw2PxPoint(bitmap);

		mService.write(draw2PxPoint);
		// 发送结束指令
		byte[] end = { 0x1d, 0x4c, 0x1f, 0x00 };
		mService.write(end);
	}

	public void onActivityResult(int requestCode, int resultCode, Intent data) {
		switch (requestCode) {
		case REQUEST_CONNECT_DEVICE:
			// When DeviceListActivity returns with a device to connect
			if (resultCode == Activity.RESULT_OK) {
				// Get the device MAC address
				String address = data.getExtras().getString(DeviceListActivity.EXTRA_DEVICE_ADDRESS);
				// Get the BLuetoothDevice object
				BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
				// Attempt to connect to the device
				mService.connect(device);
			}
			break;
		case REQUEST_ENABLE_BT:
			// When the request to enable Bluetooth returns
			if (resultCode == Activity.RESULT_OK) {
				// setupChat();
				Toast.makeText(this, "蓝牙已打开", 0);
			} else {
				Toast.makeText(this, "蓝牙没有打开", 0);
				finish();
			}
		}
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		switch (item.getItemId()) {
		case R.id.scan:
			// Launch the DeviceListActivity to see devices and do scan
			Intent serverIntent = new Intent(this, DeviceListActivity.class);
			startActivityForResult(serverIntent, REQUEST_CONNECT_DEVICE);
			return true;
		case R.id.disconnect:
			// disconnect
			mService.stop();
			return true;
		}
		return false;
	}

	// The Handler that gets information back from the BluetoothService
	private final Handler mHandler = new Handler() {
		@Override
		public void handleMessage(Message msg) {
			switch (msg.what) {
			case MESSAGE_STATE_CHANGE:
				switch (msg.arg1) {
				case BluetoothService.STATE_CONNECTED:
					print_connect_btn.setText("已连接:");
					print_connect_btn.append(mConnectedDeviceName);
					break;
				case BluetoothService.STATE_CONNECTING:
					print_connect_btn.setText("正在连接...");
					break;
				case BluetoothService.STATE_LISTEN:
				case BluetoothService.STATE_NONE:
					print_connect_btn.setText("无连接");
					break;
				}
				break;
			case MESSAGE_WRITE:
				// byte[] writeBuf = (byte[]) msg.obj;
				// construct a string from the buffer
				// String writeMessage = new String(writeBuf);
				break;
			case MESSAGE_READ:
				// byte[] readBuf = (byte[]) msg.obj;
				// construct a string from the valid bytes in the buffer
				// String readMessage = new String(readBuf, 0, msg.arg1);
				break;
			case MESSAGE_DEVICE_NAME:
				// save the connected device's name
				mConnectedDeviceName = msg.getData().getString(DEVICE_NAME);
				Toast.makeText(getApplicationContext(), "连接至"   mConnectedDeviceName, Toast.LENGTH_SHORT).show();
				break;
			case MESSAGE_TOAST:
				Toast.makeText(getApplicationContext(), msg.getData().getString(TOAST), Toast.LENGTH_SHORT).show();
				break;
			}
		}
	};
	private Button print_connect_btn;
}