BluetoothChat/Application/src/main/java/com/example/android/bluetoothchat/BluetoothChatService.java [262:276]:
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    private void connectionFailed() {
        // Send a failure message back to the Activity
        Message msg = mHandler.obtainMessage(Constants.MESSAGE_TOAST);
        Bundle bundle = new Bundle();
        bundle.putString(Constants.TOAST, "Unable to connect device");
        msg.setData(bundle);
        mHandler.sendMessage(msg);

        mState = STATE_NONE;
        // Update UI title
        updateUserInterfaceTitle();

        // Start the service over to restart listening mode
        BluetoothChatService.this.start();
    }
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BluetoothChat/Application/src/main/java/com/example/android/bluetoothchat/BluetoothChatService.java [281:295]:
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    private void connectionLost() {
        // Send a failure message back to the Activity
        Message msg = mHandler.obtainMessage(Constants.MESSAGE_TOAST);
        Bundle bundle = new Bundle();
        bundle.putString(Constants.TOAST, "Device connection was lost");
        msg.setData(bundle);
        mHandler.sendMessage(msg);

        mState = STATE_NONE;
        // Update UI title
        updateUserInterfaceTitle();

        // Start the service over to restart listening mode
        BluetoothChatService.this.start();
    }
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