实例介绍
【实例简介】Android蓝牙打印二维码打印外卖单打印
【实例截图】
【核心代码】
package org.yuc.bluetooth;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
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:
sendMessage(print_et.getText().toString() "\n");
break;
case R.id.print_img_btn:
sendMessage("\n");
sendMessage("\n");
BufferedInputStream bis = null;
try {
bis = new BufferedInputStream(getAssets()
.open("android.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("GB2312");
} 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;
}
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