diff --git a/src/android_serialport_api/print_tool/MobilePrintTool.java b/src/android_serialport_api/print_tool/MobilePrintTool.java
index c6d7d88..881aacb 100644
--- a/src/android_serialport_api/print_tool/MobilePrintTool.java
+++ b/src/android_serialport_api/print_tool/MobilePrintTool.java
@@ -516,130 +516,142 @@ public class MobilePrintTool extends Activity {
 		}
 	}
 
-	// 蓝牙连接等待弹框
-	private ProgressDialog dialog = null;
-	// 连接的设备的名称
-	private String mConnectedDeviceName = null;
-	// 更新标题栏右边状态和读写状态的Handler
-	@SuppressLint("HandlerLeak")
-	private final Handler mHandler = new Handler() {
-		@Override
-		public void handleMessage(Message msg) {
-			switch (msg.what) {
-				case BluetoothService.MESSAGE_STATE_CHANGE:
-					switch (msg.arg1) {
-						case BluetoothService.STATE_CONNECTED:
-							MyApp.getInstance().setBluConnection(true);
-							if (!isprint) {
-								isprint = true;
-								isprint2 = true;
-							}
-							print(info);
-							if (dialog != null) {
-								dialog.dismiss();
-								dialog = null;
-							}
-							break;
-						case BluetoothService.STATE_CONNECTING:
-							if (dialog == null) {
-								// 显示ProgressDialog
-								dialog = new ProgressDialog(MobilePrintTool.this);
-								dialog.setMessage("连接打印机中...");
-								dialog.setCanceledOnTouchOutside(true);
-								dialog.setCancelable(true);
-								if (type == DeviceType.HANDSET.getValue()) {
-									dialog.getWindow()
-											.setType(
-													WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
-								}
-								try {
-									dialog.show();
-								} catch (Exception e) {
-									e.printStackTrace();
-								}
-							} else {
-								dialog.setMessage("连接打印机中...");
-							}
-							break;
-						case BluetoothService.STATE_NONE:
-							break;
-						case BluetoothService.STATE_LISTEN:
-							// MyApp.getInstance().setBluConnection(false);
-							if (dialog != null) {
-								dialog.dismiss();
-								dialog = null;
-							}
-							break;
-						case BluetoothService.STATE_FAILL:
-							if (dialog != null) {
-								dialog.dismiss();
-								dialog = null;
-							}
-							finish();
-							break;
-					}
-					break;
-				case BluetoothService.STATE_FAILL:
-					if (dialog != null) {
-						dialog.dismiss();
-						dialog = null;
-					}
-					finish();
-					break;
-				case BluetoothService.MESSAGE_WRITE:
-					break;
-				case BluetoothService.MESSAGE_READ:
-					break;
-				case BluetoothService.MESSAGE_DEVICE_NAME:
-					// 保存连接设备的名字
-					mConnectedDeviceName = msg.getData().getString(
-							BluetoothService.DEVICE_NAME);
-					if (type != null && type == DeviceType.HANDSET.getValue()) {
-						MToast.makeText(MobilePrintTool.this,
-								"连接到" + mConnectedDeviceName, MToast.LENGTH_SHORT)
-								.show();
-					} else {
-						Toast.makeText(MobilePrintTool.this,
-								"连接到" + mConnectedDeviceName, Toast.LENGTH_SHORT)
-								.show();
-					}
-					if (!isprint) {
-						isprint = true;
-						isprint2 = true;
-					}
-					print(info);
-					break;
-				case BluetoothService.MESSAGE_TOAST:
-					if (!msg.getData().getBoolean("sucess", false)) {
-						finish();
-						return;
-					}
-					if (Thread.currentThread() != Looper.getMainLooper()
-							.getThread()) {
-						Looper.prepare();
-					}
-					String info = msg.getData().getString(BluetoothService.TOAST);
-					if (info != null && !info.equals("")) {
-						if (type != null && type == DeviceType.HANDSET.getValue()) {
-							MToast.makeText(
-									MobilePrintTool.this,
-									msg.getData().getString(BluetoothService.TOAST),
-									MToast.LENGTH_LONG).show();
-						} else {
-							Toast.makeText(
-									MobilePrintTool.this,
-									msg.getData().getString(BluetoothService.TOAST),
-									Toast.LENGTH_LONG).show();
-						}
-						if (Thread.currentThread() != Looper.getMainLooper()
-								.getThread()) {
-							Looper.loop();
-						}
-					}
-					break;
-			}
-		}
-	};
+    // 蓝牙连接等待弹框
+    private ProgressDialog dialog = null;
+    // 连接的设备的名称
+    private String mConnectedDeviceName = null;
+    // 更新标题栏右边状态和读写状态的Handler
+    @SuppressLint("HandlerLeak")
+    private final Handler mHandler = new Handler() {
+        @Override
+        public void handleMessage(Message msg) {
+            switch (msg.what) {
+                case BluetoothService.MESSAGE_STATE_CHANGE:
+                    switch (msg.arg1) {
+                        case BluetoothService.STATE_CONNECTED:
+                            MyApp.getInstance().setBluConnection(true);
+                            if (!isprint) {
+                                isprint = true;
+                                isprint2 = true;
+                            }
+                            if (!TextUtils.isEmpty(info)) {
+                                print(info);
+                            } else {
+                                Toast.makeText(MobilePrintTool.this,
+                                        "没有可打印数据！", Toast.LENGTH_SHORT)
+                                        .show();
+                            }
+                            if (dialog != null) {
+                                dialog.dismiss();
+                                dialog = null;
+                            }
+                            break;
+                        case BluetoothService.STATE_CONNECTING:
+                            if (dialog == null) {
+                                // 显示ProgressDialog
+                                dialog = new ProgressDialog(MobilePrintTool.this);
+                                dialog.setMessage("连接打印机中...");
+                                dialog.setCanceledOnTouchOutside(true);
+                                dialog.setCancelable(true);
+                                if (type == DeviceType.HANDSET.getValue()) {
+                                    dialog.getWindow()
+                                            .setType(
+                                                    WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
+                                }
+                                try {
+                                    dialog.show();
+                                } catch (Exception e) {
+                                    e.printStackTrace();
+                                }
+                            } else {
+                                dialog.setMessage("连接打印机中...");
+                            }
+                            break;
+                        case BluetoothService.STATE_NONE:
+                            break;
+                        case BluetoothService.STATE_LISTEN:
+                            // MyApp.getInstance().setBluConnection(false);
+                            if (dialog != null) {
+                                dialog.dismiss();
+                                dialog = null;
+                            }
+                            break;
+                        case BluetoothService.STATE_FAILL:
+                            if (dialog != null) {
+                                dialog.dismiss();
+                                dialog = null;
+                            }
+                            finish();
+                            break;
+                    }
+                    break;
+                case BluetoothService.STATE_FAILL:
+                    if (dialog != null) {
+                        dialog.dismiss();
+                        dialog = null;
+                    }
+                    finish();
+                    break;
+                case BluetoothService.MESSAGE_WRITE:
+                    break;
+                case BluetoothService.MESSAGE_READ:
+                    break;
+                case BluetoothService.MESSAGE_DEVICE_NAME:
+                    // 保存连接设备的名字
+                    mConnectedDeviceName = msg.getData().getString(
+                            BluetoothService.DEVICE_NAME);
+                    if (type != null && type == DeviceType.HANDSET.getValue()) {
+                        MToast.makeText(MobilePrintTool.this,
+                                "连接到" + mConnectedDeviceName, MToast.LENGTH_SHORT)
+                                .show();
+                    } else {
+                        Toast.makeText(MobilePrintTool.this,
+                                "连接到" + mConnectedDeviceName, Toast.LENGTH_SHORT)
+                                .show();
+                    }
+                    if (!isprint) {
+                        isprint = true;
+                        isprint2 = true;
+                    }
+                    if (!TextUtils.isEmpty(info)) {
+                        print(info);
+                    } else {
+                        Toast.makeText(MobilePrintTool.this,
+                                "没有可打印数据！", Toast.LENGTH_SHORT)
+                                .show();
+                    }
+                    break;
+                case BluetoothService.MESSAGE_TOAST:
+                    if (!msg.getData().getBoolean("sucess", false)) {
+                        finish();
+                        return;
+                    }
+                    if (Thread.currentThread() != Looper.getMainLooper()
+                            .getThread()) {
+                        Looper.prepare();
+                    }
+                    String info = msg.getData().getString(BluetoothService.TOAST);
+                    if (info != null && !info.equals("")) {
+                        if (type != null && type == DeviceType.HANDSET.getValue()) {
+                            MToast.makeText(
+                                    MobilePrintTool.this,
+                                    msg.getData().getString(BluetoothService.TOAST),
+                                    MToast.LENGTH_LONG).show();
+                        } else {
+                            Toast.makeText(
+                                    MobilePrintTool.this,
+                                    msg.getData().getString(BluetoothService.TOAST),
+                                    Toast.LENGTH_LONG).show();
+                        }
+                        if (Thread.currentThread() != Looper.getMainLooper()
+                                .getThread()) {
+                            Looper.loop();
+                        }
+                    }
+                    break;
+            }
+        }
+    };
 
 	@Override
 	protected void onDestroy() {